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Efeitos da enramicina e da monensina sódica no consumo de matéria seca, na fermentação ruminal e no comportamento alimentar em bovinos alimentados com dietas com alto nível de concentrado; Effects of enramycin and sodium monensin on dry matter intake, ruminal fermentation and alimentary behavior in bovine fed high-concentrate diets

BORGES, Luiz Felipe de Onofre; PASSINI, Roberta; MEYER, Paula Marques; PIRES, Alexandre Vaz; RODRIGUES, Paulo Henrique Mazza
Fonte: Sociedade Brasileira de Zootecnia Publicador: Sociedade Brasileira de Zootecnia
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
76.05%
Estudaram-se os efeitos da administração de enramicina e monensina sódica no consumo de matéria seca (MS), na fermentação ruminal e no comportamento alimentar de bovinos. Doze fêmeas bovinas não-gestantes e não-lactantes (675 ± 63 kg PC) foram distribuídas inteiramente ao acaso em três tratamentos, formados por um grupo controle, um grupo tratado com enramicina e outro tratado com monensina. Os animais foram alimentados com dieta contendo 60% de concentrado (milho, farelo de soja e minerais) e 40% de volumoso (cana-de-açúcar). A enramicina foi administrada na dose de 20 mg/animal/dia e a monensina na dose de 300 mg/animal/dia. O experimento teve duração total de 21 dias, de modo que o 21º dia foi utilizado para coleta de líquido ruminal, realizada às 0, 2, 4, 6, 8, 10 e 12 horas após a primeira refeição. A monensina aumentou a concentração total de AGV 12 horas após a alimentação, em relação aos demais tratamentos, e diminuiu a relação acético:propiônico nos tempo 0 e 6 horas, em relação à enramicina, mas não em relação ao controle. Nenhum dos antibióticos testados alterou a proporção molar dos ácidos acético, propiônico ou butírico nem o pH e a concentração ruminal de nitrogênio amoniacal. Os antibióticos também não alteraram o consumo de MS ou o comportamento ingestivo...

Influência da alta ou baixa ingestão de matéria seca e/ou energia na produção in vitro de embriões bovinos; Influence of high or low intake of dry matter/energy on in vitro production of bovine embryos

Prata, Alexandre Barbieri
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 19/03/2013 Português
Relevância na Pesquisa
76.13%
Objetivou-se no presente estudo avaliar a influência da alta ou baixa ingestão de matéria seca e/ou energia na qualidade ovocitária, produção in vitro de embriões e taxa de concepção. Foram utilizadas 33 vacas Nelores não lactantes, idade entre 4 e 10 anos, peso corporal (PC) de 489,5±11,3 kg e escore de condição corporal (ECC) de 3,25. As vacas foram mantidas confinadas em baias, sem acesso a pastagem, com dois animais por baia. Sal mineral foi fornecido na dieta e água à vontade. Após 15 dias de adaptação, os animais foram agrupados de acordo com o PC e divididos aleatoriamente em quatro grupos. As vacas do grupo mantença (M) receberam dieta de manutenção do PC consumindo 1,2% de MS por kg de PC. O grupo restrição (0,7M) recebeu o equivalente a 70% do fornecido ao grupo M, ou seja, 0,84% de MS por kg de PC. O grupo alta ingestão (1,5M) recebeu o equivalente a 150% do oferecido ao grupo M, ou seja, 1,8% de MS por kg de PC. O grupo energia (E) recebeu uma dieta com quantidade de MS semelhante ao grupo M, porém, com níveis energéticos equivalentes ao grupo 1,5M. O delineamento foi em quadrado latino, portanto, os animais passaram por todas as dietas. Foram realizadas quatro seções de OPU com 37 dias de intervalo. Os ovócitos recuperados foram classificados e levados ao laboratório da In Vitro Brasil...

Prediction of intake and average daily gain by different feeding systems for goats

Molina de Almeida Teixeira, Izabelle Auxiliadora; St-Pierre, Normand; Resende, Kleber Tomás de; Cannas, Antonello
Fonte: Elsevier B.V. Publicador: Elsevier B.V.
Tipo: Artigo de Revista Científica Formato: 93-97
Português
Relevância na Pesquisa
76.03%
A main purpose of a mathematical nutrition model (a.k.a., feeding systems) is to provide a mathematical approach for determining the amount and composition of the diet necessary for a certain level of animal productive performance. Therefore, feeding systems should be able to predict voluntary feed intake and to partition nutrients into different productive functions and performances. In the last decades, several feeding systems for goats have been developed. The objective of this paper is to compare and evaluate the main goat feeding systems (AFRC, CSIRO, NRC, and SRNS), using data of individual growing goat kids from seven studies conducted in Brazil. The feeding systems were evaluated by regressing the residuals (observed minus predicted) on the predicted values centered on their means. The comparisons showed that these systems differ in their approach for estimating dry matter intake (DMI) and energy requirements for growing goats. The AFRC system was the most accurate for predicting DMI (mean bias = 91 g/d, P < 0.001; linear bias 0.874). The average ADG accounted for a large part of the bias in the prediction of DMI by CSIRO, NRC, and, mainly, AFRC systems. The CSIRO model gave the most accurate predictions of ADG when observed DMI was used as input in the models (mean bias 12 g/d...

Daily intake of lactating crossbred cows grazing elephant grass rotationally

Aroeira, Luiz Januário Magalhães; Lopes, Fernando César Ferraz; Soares, João Paulo Guimarães; Deresz, Fermino; Verneque, Rui da Silva; Arcuri, Pedro Braga; Matos, Leovegildo Lopes de
Fonte: Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) Publicador: Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Tipo: Artigo de Revista Científica Formato: 911-917
Português
Relevância na Pesquisa
66.19%
O objetivo deste trabalho foi o de estimar o consumo total e o diário de matéria seca do pasto, de vacas mestiças Holandês - Zebu, em piquetes de capim-elefante (Pennisetum purpureum Schum.). Três grupos de 24 vacas foram usados em piquetes (4,5 vacas/ha), pastejados por três dias e submetidos a diferentes períodos de descanso durante dois anos. Os tratamentos consistiram de descansos de 30 dias sem concentrado e 30, 37,5 e 45 dias com a suplementação de 2 kg de concentrado (20,6% de proteína bruta). de julho a outubro, as vacas receberam, como suplementação, cana-de-açúcar mais 1% de uréia. O consumo total de matéria seca foi estimado a partir da digestibilidade in vitro da matéria seca da extrusa e da produção fecal obtida com óxido crômico. Independentemente do tratamento, o consumo total foi 2,7; 2,9 e 2.9±0,03%, e o consumo de matéria seca do pasto foi de 1,9; 2,1 e 2,1±0,03% do peso vivo (p<0,05), respectivamente, no primeiro, segundo e terceiro dia de ocupação do piquete. Somente no verão, o consumo do pasto foi semelhante nos três dias de pastejo. A mistura cana-de-açúcar e uréia substituiu o pasto, principalmente no primeiro dia de pastejo, ocasião em que o consumo do pasto era mais baixo.; The goal of this trial was to estimate the total dry matter (TDMI) and daily pasture dry matter intakes (PDMI) by lactating crossbred Holstein - Zebu cows grazing elephant grass (Pennisetum purpureum Schum.) paddocks submitted to different rest periods. Three groups of 24 cows were used during two years. The paddocks were grazed during three days at the stocking rate of 4.5 cows/ha. Treatments consisted of resting periods of 30 days without concentrate and resting periods of 30...

Prediction of dry matter intake based on ruminal degradation from milking cows grazing coast-cross grass

Berchielli, T. T.; Soares, JPG; Aroeira, LJM; Furlan, C. L.; Salman, AKD; Da Silveira, R. N.; Malheiros, E. B.; Gomide, J. A.; Mattos, WRS; DaSilva, S. C.
Fonte: Fundação Estudos Agrarios Luiz Queiroz (fealq) Publicador: Fundação Estudos Agrarios Luiz Queiroz (fealq)
Tipo: Conferência ou Objeto de Conferência Formato: 393-394
Português
Relevância na Pesquisa
96.21%
Dry matter intake (DMI) of coast-cross grazing by crossbred Holstein-Zebu and Zebu lactating cows was calculated using in vitro dry matter digestibility from extrusa (four esophageal fistulated cows) and fecal output estimate with mordent chromium. Pasture was rotationally grazed with three days grazing period and 27 days testing period, adopting a stocking rate of 1.6 and 3.2 cows/ha, during the dry and rainy season respectively. Voluntary DMI was estimated from degradation characteristics using different equations. Predicted coast-cross DMI varied with models. The prediction of tropical forages dry matter intake from equations based in ruminal degradation parameters needs farther investigation before being employed in practice.

Voluntary intake of Tanzania grass (Panicum maximum) under rotational grazing by lactating cows

Lima, MLP; Berchielli, T. T.; Nogueira, J.; Salman, AKD; Ruggeeri, A. C.; Leme, P. R.; Aroeira, LJM; Soares, JPG; Gomide, J. A.; Mattos, WRS; DaSilva, S. C.
Fonte: Fundação Estudos Agrarios Luiz Queiroz (fealq) Publicador: Fundação Estudos Agrarios Luiz Queiroz (fealq)
Tipo: Conferência ou Objeto de Conferência Formato: 713-714
Português
Relevância na Pesquisa
76.23%
The study was conducted at Nucleo de Pesquisas Zootecnicas Nordeste of the Instituto de Zootecnia, Ribeirao Preto, SP, in a rotational grazing area of Tanzania grass (Panicum maximum), to estimate the dry matter intake by lactanting cows. The estimation of dry matter intake was calculated from the feces production estimated using extrusa Chromium-mordent and the in vitro digestibility of diet. The three treatments were crossbreed cows fed 3 kg.day(-1) of concentrate, crossbred cows without concentrate suplementation and pure Gir cows also without concentrate supplementation. The milk production was 11.98, 6.53 and 5.46 kg per cow per day, the grass intake was 8.26 +/- 5.66, 11.01 +/- 5.37 and 9.55 +/- 2.31 kg of dry matter per day or 2.15%, 2.37% and 2.34% of live weight for the three experimental groups respectively. The milk production was higher (P<0.01) for cows fed with concentrate. No difference was found for dry matter intake.

Frequência da suplementação de bovinos da raça Nelore mantidos em pastagens

Canesin, Roberta Carrilho
Fonte: Universidade Estadual Paulista (UNESP) Publicador: Universidade Estadual Paulista (UNESP)
Tipo: Tese de Doutorado Formato: ix, 119 f. : il.
Português
Relevância na Pesquisa
66.23%
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Pós-graduação em Zootecnia - FCAV; O objetivo deste estudo foi avaliar o efeito da frequência de suplementação no comportamento ingestivo animal, ingestão e digestibilidade da matéria seca, desempenho e características da carcaça; além de verificar o efeito da frequência de suplementação na, fermentação ruminal, fluxo de nutrientes, eficiência de síntese microbiana e produção de metano ruminal de bovinos Nelore, mantidos em pastagem de Brachiaria brizantha cv Marandu, durante o período da seca. O suplemento foi fornecido diariamente, de segunda a sexta-feira e suspenso aos sábados e domingos e em dias alternados, na ordem de 1%; 1,4% e 2,0% do peso corporal, respectivamente. O suplemento foi composto de polpa cítrica, farelo de algodão e uréia. Os dados foram submetidos à análise de variância com medidas repetidas no tempo, pelo procedimento MIXED do SAS, e as médias foram comparadas através do teste de Tukey. A frequência de suplementação não influenciou o desempenho, o comportamento ingestivo animal, a ingestão de matéria seca, a eficiência de síntese microbiana e a produção de metano ruminal. Os meses do ano exerceram efeito na massa e composição química da forragem...

Genetic parameter estimates for feed efficiency and dry matter intake and their association with growth and carcass traits in Nellore cattle

Santana, M. H. A.; Oliveira Junior, G. A.; Gomes, R. C.; Silva, S. L.; Leme, P. R.; Stella, T. R.; Mattos, E. C.; Rossi Junior, P.; Baldi Rey, Fernando Sebastián; Eler, J. P.; Ferraz, J. B. S.
Fonte: Elsevier B.V. Publicador: Elsevier B.V.
Tipo: Artigo de Revista Científica Formato: 80-85
Português
Relevância na Pesquisa
76.06%
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Processo FAPESP: 12/02039-9; Processo FAPESP: 12/03551-5; This study estimated genetic parameters and (co)variance components for dry matter intake (DMI), average daily gain (ADG), feed conversion rate (FCR), residual feed intake (RFI), residual body weight gain (RWG) and residual intake and body weight gain (RIG) in Nellore cattle. We also estimated the genetic and phenotypic correlations between these traits with growth and carcass traits. We used data on feed efficiency of 1038 Nellore males (Bos indicus), being 147 castrated and 891 young bulls. The animals were progenies of 176 sires and 779 dams, composing a relationship matrix of 3521 animals. The (co) variance components and genetic parameters were estimated by GIBBS2F90 software, using the Bayesian approach. The heritability estimates for DMI, RFI and RIG were 0.40, 038 and 0.54, respectively. The genetic correlations between all feed efficiency and carcass traits were low. The traits analyzed showed enough genetic variability and heritability, thus the inclusion of feed efficiency in animal breeding programs of Nellore cattle is feasible. The RIG showed higher heritability and a selection for feed efficiency does not have a negative effect on carcass traits. (c) 2014 Elsevier B.V. All rights reserved.

Daily intake of lactating crossbred cows grazing elephant grass rotationally

Aroeira,Luiz Januário Magalhães; Lopes,Fernando César Ferraz; Soares,João Paulo Guimarães; Deresz,Fermino; Verneque,Rui da Silva; Arcuri,Pedro Braga; Matos,Leovegildo Lopes de
Fonte: Embrapa Informação Tecnológica; Pesquisa Agropecuária Brasileira Publicador: Embrapa Informação Tecnológica; Pesquisa Agropecuária Brasileira
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2001 Português
Relevância na Pesquisa
66.19%
The goal of this trial was to estimate the total dry matter (TDMI) and daily pasture dry matter intakes (PDMI) by lactating crossbred Holstein - Zebu cows grazing elephant grass (Pennisetum purpureum Schum.) paddocks submitted to different rest periods. Three groups of 24 cows were used during two years. The paddocks were grazed during three days at the stocking rate of 4.5 cows/ha. Treatments consisted of resting periods of 30 days without concentrate and resting periods of 30, 37.5 and 45 days with 2 kg/cow/day of 20.6% crude protein concentrate. From July to October, pasture was supplemented with chopped sugarcane plus 1% urea. Total daily dry matter intake was estimated using the extrusa in vitro dry matter digestibility and the fecal output with chromium oxide. Regardless of the treatment the estimated average TDMI was 2.7, 2.9 and 2.9±0.03% and the mean PDMI was 1.9, 2.1 and 2.1±0.03% of body weight in the first, second and third grazing day, respectively (P<0.05). Only during the summer pasture quality was the same whichever the grazing day. Sugarcane effectively replaced grazing pasture, mainly in the first day when pasture dry matter intake was lowest.

A meta-analysis of dry matter intake in Nellore and Zebu-crosses cattle

Azevêdo,José Augusto Gomes; Valadares Filho,Sebastião de Campos; Pina,Douglas dos Santos; Chizzotti,Mario Luiz; Valadares,Rilene Ferreira Diniz
Fonte: Sociedade Brasileira de Zootecnia Publicador: Sociedade Brasileira de Zootecnia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2010 Português
Relevância na Pesquisa
76.23%
The study was carried out to develop and to evaluate new equations to predict dry matter intake (DMI) of Nellore and Zebu-crosses cattle using meta-analysis procedure. The data used to estimate the parameters were collected from independent performance experiments using growing and fattening Nellore and Zebu-crosses cattle, and they were compiled from 561 experimental units. Before proposing an equation to predict DMI, it was observed that the genetic group was a source of statisticaly significant variation. Therefore, equations to predict dry matter intake in the Zebu-Crosses and Nellore cattle were independently developed. The regression equations for Zebu-crosses cattle were: DMI = -2.6098 + 0.08844BW0.75 + 4.4672ADG - 1.3579ADG2 and DMI = -1.0094 + 0.01608BW + 4.4363ADG -1.2548ADG2. The regression equations for Nellore cattle were: DMI = -2.7878 + 0.08789BW0.75 + 5.0487ADG - 1.6835ADG2 and DMI = -1.3559 + 0.0159BW + 5.6397ADG - 1.8494ADG2. In order to evaluate fitted equations, it was utilized data from independent experiments published from 2005 to 2008 in the Revista Brasileira de Zootecnia. The equations (DMI) for Nellore overpredicted dry matter intake for estimates lower than 7 and higher than 10 kg·d-1. For Zebu-crosses cattle...

Evaluation of the Cornell Net Carbohydrate and Protein System model on the prediction of dry matter intake and milk production of grazing crossbred cows

Morenz,Mirton José Frota; Silva,José Fernando Coelho da; Aroeira,Luiz Januário Magalhães; Deresz,Fermino; Vásquez,Hernán Maldonado; Lopes,Fernando César Ferraz; Paciullo,Domingos Sávio Campos; Tedeschi,Luis Orlindo
Fonte: Sociedade Brasileira de Zootecnia Publicador: Sociedade Brasileira de Zootecnia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2012 Português
Relevância na Pesquisa
66.24%
The Cornel Net Carbohydrate and Protein System model version 5.0 was assessed as for its prediction of dry matter intake and milk production of grazing lactating Holstein × Zebu cows. Eight lactating cows grazing elephant grass (Pennisetum purpureum, Schum., cv. Napier) were used in two experiments of 30 days each. The experimental design was of randomized blocks (subplots). Dry matter intake was estimated using the chromium oxide and in vitro dry matter digestibility techniques. The estimated dry matter intake was compared with the values predicted by the model. Extrusa samples of the elephant grass pasture were obtained from a cow with esophageal fistula during nine days in each experimental period. Carbohydrate and nitrogenous fractions were analyzed and the degradation rate of carbohydrate was estimated by the gas production technique. The inputs referring to the animals (body weight, age, milk production, milk composition and breed type), to the environment (temperature, relative humidity of air and management condition) and to feeds chemical composition in each experimental period were inserted in the model. The model was accurate on the prediction of dry matter intake, considering that the mean values obtained by the chromium oxide technique and predicted by model (2.45 and 2.46% of body weight...

Models for estimating feed intake in small ruminants

Pulina,Giuseppe; Avondo,Marcella; Molle,Giovanni; Francesconi,Ana Helena Dias; Atzori,Alberto Stanislao; Cannas,Antonello
Fonte: Sociedade Brasileira de Zootecnia Publicador: Sociedade Brasileira de Zootecnia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2013 Português
Relevância na Pesquisa
76.08%
This review deals with the most relevant limits and developments of the modeling of intake of sheep and goats reared intensively and extensively. Because small ruminants are normally fed ad libitum, voluntary feed intake is crucial in feeding tactics and strategies aimed at optimal animal production. The effects of genetic, neuroendocrine, hormonal, feed and environmental factors on voluntary feed intake were discussed. Then, several mathematical models to estimate dry matter intake (DMI) were examined, with emphasis on empirical models for sheep and goats in intensive farm systems or in extensive areas under pasture or rangeland conditions. A sensitivity analysis of four models of prediction of DMI in housed lactating dairy sheep and meat sheep breeds was also presented. This work evidenced a large variability in the approaches used and in the variables considered for housed sheep and goats. Regarding the estimation of feed intake for grazing sheep and browsing goats, the accuracy of estimates based on empirical models developed so far is very low when applied out of the boundaries of the studied system. Feeding experiments indoors and outdoors remain fundamental for a better modeling and understanding of the interactions between feeds and small ruminants. However...

Effect of the dry matter intake level on the sanguine profile of glucose, insulin, urea, estrogen and progesterone and concentration of IGF-I in the follicular liquid of crossbred heifers

Rigolon,Luiz Paulo; Prado,Ivanor Nunes do; Cavalieri,Fábio Luiz Bim; Nascimento,Willian Gonçalves do; Copovila,Luiz Carlos; Ramos,Fabíola dos Santos; Moreira,Fernanda Barros
Fonte: Instituto de Tecnologia do Paraná - Tecpar Publicador: Instituto de Tecnologia do Paraná - Tecpar
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2009 Português
Relevância na Pesquisa
76.11%
The aim of this work was to study effect of the dry matter intake level on the concentrations of glucose, insulin, urea, estrogen and progesterone in the blood and the level of IGF-I in the follicular liquid of heifers. Twenty seven crossbred heifers were used, in three treatments: 1.2, 1.6 and 2.6% of the live weight of dry matter intake (DMI) daily. The sanguine concentrations of glucose and estrogen were higher in the animals with 1.6% of DMI and the insulin levels were higher in the animals with 2.6% of DMI. There was an increase in the sanguine levels of urea with the increase of the DMI. There was no effect of the DMI on the progesterone levels in the sanguine plasma collected from the jugular. The progesterone levels in caudal vena were higher in the animals with 2.6% of DMI. There was no effect of the DMI on the follicular levels of IGF-I.

Lactation curves and economic results of Saanen goats fed increasing dietary energy levels obtained by the addition of calcium salts of fatty acids

Souza,Rodrigo de; Alcalde,Claudete Regina; Oliveira,Carlos Antonio Lopes de; Molina,Bruna Susan de Labio; Macedo,Francisco de Assis Fonseca de; Gomes,Ludmila Couto; Hygino,Bruna; Possamai,Ana Paula Silva
Fonte: Sociedade Brasileira de Zootecnia Publicador: Sociedade Brasileira de Zootecnia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2014 Português
Relevância na Pesquisa
66.22%
The objective of this study was to evaluate the use of calcium salts of fatty acids (CSFA) to increase the dietary energy levels for Saanen goats and their effects on the lactation curve, dry matter intake, body weight, and economic results of the goats. Twenty multiparous goats, weighing an average of 63.5±10.3 kg, were randomly assigned to one of four treatment groups, each receiving one of the following dietary energy levels: a control diet consisting of 2.6 Mcal of metabolizable energy per kg of dry matter (Mcal ME/kg DM) or a test diet supplemented with CSFA (Lactoplus®) to obtain 2.7, 2.8, or 2.9 Mcal ME/kg DM. Goats were housed in individual stalls and were fed and milked twice daily. The animals were evaluated until 180 days in milk by measuring dry matter intake and milk yield. These measurements were used to calculate feed efficiencies and the cost-benefit ratio of diet and lactation curves using Wood's nonlinear model. Increasing dietary energy levels showed no effect on body weight. Supplementation with CSFA did not limit dry matter intake; however, it changed the shape of the lactation curve by promoting a late peak lactation with a longer duration. Milk yields at 180 days in milk had a quadratic increase with a maximum energy level at 2.85 Mcal ME/kg DM. Increasing the dietary energy level for Saanen goats using CSFA changes their lactation curves...

Replacement of soybean meal by conventional and coated urea in dairy cows: intake, digestibility, production and composition of milk

Gonçalves,Geógenes da Silva; Pedreira,Marcio dos Santos; Azevedo,José Augusto Gomes; Del Rei,Antonio Jorge; Silva,Herymá Giovane Oliveira; Silva,Fabiano Ferreira
Fonte: Editora da Universidade Estadual de Maringá - EDUEM Publicador: Editora da Universidade Estadual de Maringá - EDUEM
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2014 Português
Relevância na Pesquisa
76.2%
This study evaluated the effect of dairy cows' diets containing two different sources of urea on dry matter intake, nutrient apparent digestibility, and milk production and composition. Eight crossbred cows (Holandês x Zebu) were confined and randomly assigned to four sequential diets distributed in two 4 x 4 Latin: SM = soybean meal; SRU 0 = conventional urea (CU) 100%/slow release urea (SRU) 0%; SRU 44 = CU 56%/SRU 44%; SRU 88 = CU 12%/SRU 88%. Experimental periods consisted of 21 days, with total duration of 84 days. Dry matter intake, neutral detergent fiber, organic matter, crude protein, and total digestible nutrients were not affected by experimental diets. Dry matter and neutral detergent fiber digestibility coefficient presented average values of 69.43 and 51.07%, respectively. Average digestibility of crude protein was 65.43%. Average milk production was 9.609 kg. The partial replacement of soybean meal by conventional urea and slow release urea, at 2.1% of the diet dry matter, showed that these sources of urea can be offered without production impairment for dairy cows.

Consumo de matéria seca e produção de leite de vacas "Holandês" manejada sob pastejo e utilização do modell Cornell Net Carbohydrate And Protein System; Dry matter intake and milk production of grazing lactating Holstein cows and utilization of Cornell net Carbohydrate and Protein System model

Elyas, Ana Cristina Wyllie
Fonte: UNIVERSIDADE FEDERAL DE LAVRAS; DZO - Departamento de Zootecnia; UFLA; BRASIL Publicador: UNIVERSIDADE FEDERAL DE LAVRAS; DZO - Departamento de Zootecnia; UFLA; BRASIL
Tipo: Tese de Doutorado
Publicado em 24/09/2014 Português
Relevância na Pesquisa
66.27%
The aim of this work was to evaluate the forage biomass production, chemical composition, carbohydrate and nitrogenous fractions of the coastcross pasture and the milk production and composition, dry matter intake (DMI) and passage kinetic rate and the ability of the CNCPS version 5.0 on estimative of DMI and milk production of grazing lactating Holstein cows, on coastcross pasture fed concentrate (3 or 6 kg/cow/day) and corn silage. The cows fed 17 kg/cow/day of maize ensilage at the period of May and October (dry season). The fertilization was applied, in six applications to each two months, with 200 kg/ha of N, 80 kg/ha of P2O5 and 160 kg/ha of K2O. The pasture was irrigated in the months of lower rainfall, or after the fertilizations. The mass and quality of available and residual forage as well the green leaf lamina, green stem + leaf and dead material. The collect were made to each 15 days. Was determined the chemical composition on extrusa samples of forage, obtained using an esophageous fistulated cow. The estimates of intake were obtained using chromium oxide methodology. The passage rates of particles and liquids were estimates using a single dose of chromium oxide (10 g) and Co-EDTA methodology, respectively. The milk production was measured individually daily. The milk samples were analyzed for protein...

Winter environmental effects on dry-matter intake of stabled and unsheltered holstein cows; Efeitos ambientais de inverno sobre o consumo de matéria seca por vacas holandesas estabuladas e vacas holandesas desabrigadas

Fagundes, Antonio Cesar Alves; Muller, Pedro Bernardo; Moretti, Anibal de Sant’Anna
Fonte: Universidade de São Paulo. Faculdade de Medicina Veterinária e Zootecnia Publicador: Universidade de São Paulo. Faculdade de Medicina Veterinária e Zootecnia
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; Formato: application/pdf
Publicado em 01/01/1995 Português
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86.24%
The purpose of this study was to verify the association of environment and feed intake and also to measure the variation on dry-matter intake of stabled and unsheltered holstein cows, as a function of temperature decrease, during the winter in humid subtropical climate. The experiment was developed in Santa Maria, State of Rio Grande do Sul, Brazil, during July and August, 1986. There were used 12 Holstein cows with ration based on corn silage fed for "ad libitum" consumption, distributed in two sets: stabled cows and cows maintened in padlots. The experimental design was completely randomized. The daily dry-matter intake of unsheltered cows (0.095 ± 0.006 kg/kg0.75), was significantly different (P< 0.01) from the stabled ones (0.077 ± 0.005 kg/kg0.75). There was significant correlation (P < 0.05) among dry-matter intake of unsheltered cows and environmental temperature, air humidity, wind velocity and precipitation, with coefficients varying from -0.58 to 0.51 while the feed intake of stabled cows was only correlated significantly (P < 0.05) with the environmental temperature at 7 a.m. with coefficient of -0.27. These results show that feed intake of Holstein cows kept in padlots was higher than in stabled cows, due to lower environmental temperatures...

Uso da cinza insolúvel em ácido para determinar o consumo de forragem dos bovinos; Acid insoluble ash used to determine dry matter intake by cattle

Cortada, Carmen Neusa Martins; Velloso, Licio
Fonte: Universidade de São Paulo. Faculdade de Medicina Veterinária e Zootecnia Publicador: Universidade de São Paulo. Faculdade de Medicina Veterinária e Zootecnia
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; Formato: application/pdf
Publicado em 15/03/1987 Português
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Foram utilizados seis bovinos mestiços holandês/zebu, machos inteiros, com idade variando entre 16 e 33 meses. O alimento foi o feno de Cynodon dactylon hibrido Coasteross - 1. O período experimental teve duração de 23 dias, sendo os últimos sete dias para colheita das amostras de alimento e de fezes. O feno foi fornecido picado e à vontade em duas refeições, diariamente. O consumo de matéria seca pelo método do indicador, foi calculado usando fórmulas adequadas, delineamento estatístico foi o inteiramente cercalizado. Foram comparados os consumos de matéria seca pelos métodos da cinza insolúvel em ácido HCl concentrado, HCl 2N e também pelo consumo observado no experimento. Não houve diferença estatisticamente significativa nos consumos médios de matéria seca g/kg 0,75 /dia, entre os três métodos.; Six young crossbred bulls were used to determine dry matter intake by cattle fed a tropical grass hay (Cynodon dactylon, Coastcross 1). Digestion trial lasted for 23 days being the last 7 days for feed and feces sample collections. Dry matter intake was calculated by use of adequate formulas and indicator method. Dry matter intake was calculated by acid insoluble ash HCl 2N and concentrated HCl and also by direct consumption. There was no statistical difference among methods for dry matter consumption.

Effect of two levels of supplementary feeding and two stocking rates of grazing ostriches on irrigated lucerne dry matter intake and production

Strydom,M.; van Heerden,J.M.; Brand,T.S.; Aucamp,B.B.
Fonte: South African Journal of Animal Science Publicador: South African Journal of Animal Science
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2010 Português
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This study determined the effect of two stocking rates of ostriches (10 and 15 birds/ha) and two levels of supplementary feeding (0 and 800 g/bird/day) on the intake and production of irrigated lucerne pastures over a period of five months (January to May). A lucerne pasture was divided into 16 paddocks of approximately 0.85 ha each. One hundred and seventy ostriches (± 6 months old) were randomly allocated to four groups and four different lucerne paddocks were randomly allocated to each group. Each ostrich group rotationally grazed the four lucerne paddocks and was moved to a new paddock every two weeks or as soon as pasture became depleted. The available pasture dry matter was determined by cutting and collecting a 0.166 sq m size sample to ground level inside and outside exclosure cages placed inside each paddock every time the ostriches left a paddock. Pasture material were washed to remove soil and dirt and dried to a constant dry mass at 59 ºC. The data was analyzed with analysis of variance, using the four paddocks as replicates and with two treatments and two treatment levels. For lucerne intake a significant interaction was found between level of supplementary feeding and month. Intake was not significantly influenced by supplementary feeding during January...

Dry matter intake and digestibility of temperate pastures supplemented with sorghum grain in wethers and heifers

Aguerre,M.; Cajarville,C.; Machado,V.; Persak,G.; Bambillasca,S.; Repetto,J.L.
Fonte: South African Journal of Animal Science Publicador: South African Journal of Animal Science
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2009 Português
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The aim of this study was to evaluate the effect of sorghum grain supplementation on total and forage dry matter (DM) intake and digestibility of wethers and heifers consuming temperate pasture. Twenty four Corriedale x Milchschaf wethers and 24 crossbred heifers fed temperate pasture were non-supplemented or supplemented with sorghum grain at 5, 10 or 15 g/kg body weight (BW). Offered and refused feed were measured for 11 days and faeces voided were recorded daily during five days. Samples of feeds and faeces were collected daily and analyzed for DM. Supplement inclusion led to an inverse response in both species. Total dry matter intake (TDMI) of supplemented wethers was 20% lower than non-supplemented ones. Forage dry matter intake (FDMI) averaged 40% less in supplemented groups than in non-supplemented ones. Heifers receiving the supplement had 23% more TDMI but 10% less FDMI than non-supplemented, and lower FDMI was observed as supplementation increased. Dry matter digestibility (DMD) was 0.69 for wethers and 0.65 for heifers, with no differences between treatments. When the results from all animals were analyzed together, no differences on TDMI, lower FDMI and higher DMD were observed for the supplemented groups. In conclusion...