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"Mirandesa" cattle breed: farm structure, management and marketing

Fragata, António; Sousa, Fernando Ruivo de
Fonte: Wageningen Pers Publicador: Wageningen Pers
Tipo: Conferência ou Objeto de Conferência
Português
Relevância na Pesquisa
36.87%
In spite pof losses suffered in the last decades, the "Mirandesa" cattle breed still plays an important economic and social role and the carcass is famous for the quality of the "posta mirandesa", a very appreciated dish by the rich gastronomy of Portugal. The area studied is the highlands of Northeast of Portugal (Trás-os-Montes) which range from 700 to 1000 metres. The farming systems adopted by farmers are very low intensity animal production systems and the meat of the "Mirandesa" cattle breed has benn marketed as PDO since 1996, within the meaning of the EU rules adopted under the reform of the CAP. This paper reveals the results of soft systems approach to the farmers of the "Professional Association of Mirandesa Breed" which present a diversity of characteristics in what is referred to the types of family-farm systems, sources of family income, level of education and vocational training, animal management practices and supply chains of "Mirandesa" calves.

"Mirandês" cattle breed: systems and practices of the farmers

Fragata, António; Sousa, Fernando Ruivo de
Fonte: Instituto Politécnico de Bragança Publicador: Instituto Politécnico de Bragança
Tipo: Conferência ou Objeto de Conferência
Português
Relevância na Pesquisa
36.79%
Over the centuries, the mirandesa breed has been very useful! as traction animal and meat production. The latter, and in relation to other national breeds, their productive capacity occupies the first position and is famous for the quality of "posta mirandesa", a very special and appreciated dish by the rich gastronomy in the Northeast of Portugal. In spite of erosion suffered in the last decades, the 'mirandês' cattle breed still has an important economic and social value.

Assessing the value of a portable near infrared spectroscopy sensor for predicting pork meat quality traits of "asturcelta autochthonous swine breed

Roza-Delgado, Begoña de la; Solnado, Ana; Oliveira, Antonio F. Gomes de Faria; Martínez-Fernández, Adela; Argamentería, Alejandro
Fonte: Springer Publicador: Springer
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
36.66%
Sixty-one intact meat samples from Asturcelta autochthonous swine breed were scanned in the slaughterhouse in reflectance mode. A handheld microelectromechanical system digital transform (Phazir1624, Polychromix Inc.), with a window sampling area of 0.8 × 1 cm and wavelengths ranging from 1,600 to 2,400 nm, was used. With the spectra database recorded were developed different chemometrical models assaying first and second derivatives as math treatment and standard normal variate (SNV) and multiplicative scatter correction for minimizing scattering effect. The greatest predictive capacity was achieved after applying SNV and first derivative for moisture, intramuscular fat (IMF) content, and pH parameters and second derivative for CIE L*, a*, b* colorimetric values, and the Warner-Bratzler force (instrumental texture). The coefficients of determination for calibration ranged from 0.63 to 0.89. The ratio between the standard error of the laboratory and the standard error of calibration ranged from 0.8 to 2.5 for all parameters (1.7 on average) with the exception of b and pH with ratios of 3.5 and 4.1, respectively. The statistical values obtained for the models developed to estimate IMF, CIE L*, a*, b*, moisture, and pH, displayed acceptable predictive capacity. For instrumental texture...

Parasitism by Oestrus ovis: Influence of sheep breed and nematode infections

Silva, B. F.; Bassetto, C. C.; Shaw, R. J.; Canavessi, A. M. O.; Amarante, A. F. T.
Fonte: ELSEVIER SCIENCE BV; AMSTERDAM Publicador: ELSEVIER SCIENCE BV; AMSTERDAM
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
36.79%
Previous studies showed that Santa Ines (SI) hair sheep were more resistant to gastrointestinal nematode infections (GIN) than Ile de France (IF) sheep. The present experiment aimed to evaluate if that reported resistance difference against GIN also occurred against Oestrus ovis infestation and also to evaluate the influence of O. ovis infestation on the gastrointestinal nematodes (GIN) infections. SI (n = 12) and IF (n = 12) young male lambs were weaned at 2 months of age and moved to a paddock (0.3 ha) with Brachiaria decumbens grass, where they also received concentrate ration. The animals were kept together during the experimental period (September to early December 2009). Fecal and blood samples were taken from all animals every 2 weeks and body weight and nasal discharge score (oestrosis clinic signs) were recorded on the same occasion. In early December 2009, all lambs were sacrificed and O. ovis larvae and GIN were recovered, counted and identified according to the larval stage. All animals were infested by different larval instars of O. ovis without any statistical difference between breeds (P > 0.05). The SI lambs had an average of 24.8 larvae, and the intensity of infection ranged between 14 and 39 larvae, while the IF lambs showed an average of 23.5 larvae with the minimum and maximum from 11 to 36 larvae...

A influência de raça, sexo e idade ao abate sobre a qualidade da carne de Nelore e Braford; Influence of breed, sex and age on carcass characteristics and beef quality of Nellore and Braford cattle

Nogueira, Kátia Leal
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 16/02/2007 Português
Relevância na Pesquisa
36.87%
O presente trabalho teve como objetivo avaliar os efeitos de raça, sexo e idade sob algumas características da carne, principalmente maciez, de bovinos machos e fêmeas, das raças Nelore e Braford aos 24 e 36 meses. Cento e oitenta e sete animais foram abatidos e coletados os dados de peso e pH carcaça quente. Após 24 horas de resfriamento calcularam-se o pH 24 horas, o rendimento de carcaça quente, a área de olho de lombo e a espessura de gordura. Retirou-se uma amostra do m. Longissimus dorsi de cada carcaça, as quais foram maturadas por 7 dias para as análises de perda de água por exsudação e perda de água por cocção e força de cisalhamento. A raça, idade e sexo influenciaram o peso da carcaça quente, o pH 24 horas, a área de olho de lombo, a espessura de gordura, a perda de água por cocção e a força de cisalhamento. A raça não influenciou o rendimento de carcaça quente e o sexo não causou efeito sob o pH carcaça quente e perda do exsudado. Constatou-se que as fêmeas Braford apresentaram carnes mais macias que a Nelore, porém entre os machos não houve diferença entre as duas raças. Também animais mais jovens apresentaram carnes mais macias quando comparado aos de maior maturidade.; The objective of this study was to evaluate the effects of breed...

Parasitism by Oestrus ovis: Influence of sheep breed and nematode infections

Silva, B. F.; Bassetto, C. C.; Shaw, R. J.; Canavessi, A. M. O.; Amarante, Alessandro Francisco Talamini do
Fonte: Elsevier B.V. Publicador: Elsevier B.V.
Tipo: Artigo de Revista Científica Formato: 437-444
Português
Relevância na Pesquisa
36.79%
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Processo FAPESP: 08/53494-2; Processo FAPESP: 07/58244-1; Processo FAPESP: 09/03504-4; Previous studies showed that Santa Ines (SI) hair sheep were more resistant to gastrointestinal nematode infections (GIN) than Ile de France (IF) sheep. The present experiment aimed to evaluate if that reported resistance difference against GIN also occurred against Oestrus ovis infestation and also to evaluate the influence of O. ovis infestation on the gastrointestinal nematodes (GIN) infections. SI (n = 12) and IF (n = 12) young male lambs were weaned at 2 months of age and moved to a paddock (0.3 ha) with Brachiaria decumbens grass, where they also received concentrate ration. The animals were kept together during the experimental period (September to early December 2009). Fecal and blood samples were taken from all animals every 2 weeks and body weight and nasal discharge score (oestrosis clinic signs) were recorded on the same occasion. In early December 2009, all lambs were sacrificed and O. ovis larvae and GIN were recovered, counted and identified according to the larval stage. All animals were infested by different larval instars of O. ovis without any statistical difference between breeds (P > 0.05). The SI lambs had an average of 24.8 larvae...

Biochemical profile of the Pêga donkey (Equus asinus) breed: influence of age and sex

Girardi, Annita Morais; Marques, Luiz Carlos; Toledo, Carmen Zilda Pereira de; Barbosa, José Carlos; Maldonado Jr., Walter; Jorge, Renata Lemos Nagib; Nogueira, Cláudia Aparecida da Silva
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 1-7
Português
Relevância na Pesquisa
36.66%
Inappropriate reference limits increase the risks of unnecessary investigations and diagnostic failures. Species, breed, environment, handling, and physiologic stage can influence serum biochemical variables. This study aimed to establish serum biochemical reference intervals of Pêga donkeys and the influence of age and sex on these variables. Samples were taken from 110 donkeys (79 females and 31 males; 8 under 1 year, 33 between 1 and 3 years, and 69 over 3 years old). There were no differences for creatine kinase (CK), albumin, urea, and magnesium among age groups. Animals under 1 year old had the lowest aspartate aminotransferase (AST), creatinine, triglycerides, total calcium, and chloride means; lower indirect bilirubin, gamma-glutamyl transferase (GGT), alanine aminotransferase (ALT), and sodium levels than over 3-year-old group and the highest phosphorus, glucose, cholesterol, ionized calcium, and alkaline phosphatase (AP) values. Total protein increased with age. The group from 1 to 3 years had higher potassium than up to 1-year-old group. Animals over 3 years old had the highest means of direct and total bilirubin. ALT, CK, GGT, direct and total bilirubin, urea, triglycerides, sodium, potassium, and chloride levels did not differ between genders. Females had higher AST...

Performance, survivability and carcass traits of crossbred lambs from five paternal breeds with local hair breed Santa Inês ewes

Paim, Tiago do Prado; Da Silva, Alessandra Ferreira; Martins, Rafhael Felipe Saraiva; Borges, Bárbara Oliveira; Lima, Paulo de Mello Tavares; Cardoso, Caio Cesar; Esteves, Geisa Isilda Ferreira; Louvandini, Helder; McManus, Concepta
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 28-34
Português
Relevância na Pesquisa
36.98%
The present study aimed to evaluate the performance, survivability and carcass traits of crossbred lambs. Data from 299 lambs born to 209 ewes were used. The dams were from a local hair breed (Santa Inês) and five breeds of sires were used: Dorper (DR), Ile de France (IF), Hampshire Down (HD), Texel (TX) and Santa Inês (SI). The lambs were weighed at birth, weaning and slaughter. Fasting body weight, skin thickness, hot and cold carcass weight, carcass yield and carcass length were measured at slaughter. Carcasses were separated into commercial cuts: neck, shoulder, rib, belly, loin and leg. Leg length and circumference were measured. Analyses of variances using MIXED procedure in SAS® were carried out for weights and carcass traits. Factor, discriminant and canonical analysis were carried out. Mortality data of animals from birth until slaughter was analyzed using logistic regression. The HD animals had the highest mortality rate. TX lambs had similar growth rate and survivability compared to DR and IF and had better carcass traits than these genetic groups. Therefore, this breed can be used as paternal breed to crossbreeding with Santa Inês dams. Santa Inês animals did not differ in growth from birth until slaughter compared to crossbred animals...

Comparative study on colostrum production and colostrum composition in Alentejano Swine Breed and LW x LR sows - Preliminary results

Charneca, Rui; Tirapicos Nunes, José; Le Dividich, Jean
Fonte: Universidade de Évora Publicador: Universidade de Évora
Tipo: Aula Formato: 7322 bytes; application/pdf
Português
Relevância na Pesquisa
36.66%
This study aimed at comparing the colostrum composition and production of Alentejano Swine Breed (AL) to modern sows (LW x LR) (LL). Ten sows from each genotype were used. All farrowings were attended. Colostrum samples were collected at birth of the first piglet and at regular intervals during 36 h after the onset of farrowing. One sample of milk was also collected at d 15 of lactation. Piglets were weighed at birth and at 24 h of age. AL sows had lower gestation length (p < 0.001) and litter size (p < 0.05). Piglets from AL sow were lighter at birth (p < 0.001), gained less weight (p < 0.001) and consumed less colostrum (p < 0.001) than LL piglets between birth and 24 h of age. AL sows produced less colostrum (p < 0.001) than LL sows. Within each genotype colostrum consumption of piglets was dependent on birth weight (p < 0.001). Production of colostrum was dependent on litter weight (piglets born alive) at birth but not on litter size. Mortality rate between birth and weaning averaged 24.3% for AL piglets and 14.3% for the LL piglets, with most of losses occurring within 3 days after birth. In both genotypes, piglets dying before weaning were lighter at birth and consumed less colostrum than survivors. Further studies are required to determine the respective role of birth weight and colostrum consumption in post-natal mortality and to determine the immune quality of colostrum.

COMPARATIVE STUDY ON COLOSTRUM PRODUCTION AND COLOSTRUM COMPOSITION IN ALENTEJANO SWINE BREED AND LWxLR SOWS – PRELIMINARY RESULTS

Charneca, Rui; Tirapicos Nunes, José Luís; Le Dividich, Jean
Fonte: Universidade de Évora Publicador: Universidade de Évora
Tipo: Artigo de Revista Científica Formato: 43436 bytes; application/pdf
Português
Relevância na Pesquisa
36.66%
This study aimed at comparing the colostrum composition and production of Alentejano Swine Breed (AL) to modern sows (LW x LR) (LL). Ten sows from each genotype were used. All farrowings were attended. Colostrum samples were collected at birth of the first piglet and at regular intervals during 36 h after the onset of farrowing. One sample of milk was also collected at d 15 of lactation. Piglets were weighed at birth and at 24 h of age. AL sows had lower gestation length (p < 0.001) and litter size (p < 0.05). Piglets from AL sow were lighter at birth (p < 0.001), gained less weight (p < 0.001) and consumed less colostrum (p < 0.001) than LL piglets between birth and 24 h of age. AL sows produced less colostrum (p < 0.001) than LL sows. Within each genotype colostrum consumption of piglets was dependent on birth weight (p < 0.001). Production of colostrum was dependent on litter weight (piglets born alive) at birth but not on litter size. Mortality rate between birth and weaning averaged 24.3% for AL piglets and 14.3% for the LL piglets, with most of losses occurring within 3 days after birth. In both genotypes, piglets dying before weaning were lighter at birth and consumed less colostrum than survivors. Further studies are required to determine the respective role of birth weight and colostrum consumption in post-natal mortality and to determine the immune quality of colostrum.

Isolation and molecular characterization of the fatty acid synthase gene from an obese pig breed

Albuquerque, André Filipe Barreto
Fonte: Universidade de Évora Publicador: Universidade de Évora
Tipo: Dissertação de Mestrado
Português
Relevância na Pesquisa
36.87%
Isolamento e caraterização molecular do gene fatty acid synthase num porco obeso O porco Alentejano é uma raça autóctone do sul de Portugal geneticamente idêntica ao porco Ibérico. Esta raça obesa é caraterizada por um crescimento lento e uma capacidade adipogénica precoce e elevada. A formação do tecido adiposo em suínos é obtida em 80% via síntese de novo, apesar de também poder ocorrer síntese independente de ácidos gordos intramusculares. O porco Alentejano apresenta a característica genótipo “poupador” (thrifty genotype), responsável pelo elevado potencial e maior capacidade de deposição de tecido adiposo que outras raças comerciais magras. O objetivo deste estudo foi determinar a sequência genética do enzima lipogénico fatty acid synthase (FAS) do tecido adiposo subcutâneo de um porco obeso de raça Alentejana. De acordo com a pesquisa feita, esta é a primeira publicação de uma sequência parcial deste gene em porcos Alentejanos. Através da clonagem de produtos de PCR, foram detetados três polimorfismos: c.6361C>T, c.6632C>A e c.6693C>T., sendo que os últimos dois conduzem a alterações no resíduo traduzido; ABSTRACT: The Alentejano (AL) pig is an autochthonous breed genetically similar to the Iberian pig. This obese breed is characterized by slow growth rates and precociously high lipogenic activity. De novo synthesis is responsible for about 80% of all fatty acid (FA) synthesis in swine adipose tissue...

Molecular genetic analysis of a cattle population to reconstitute the extinct Algarvia breed

Cravador, A.; Ginja, Catarina; Penedo, Maria; Sobral, M.; Matos, José; Borges, Carla; Neves, D.; Rangel-Figueiredo, Teresa
Fonte: Universidade do Algarve Publicador: Universidade do Algarve
Tipo: Artigo de Revista Científica
Publicado em //2010 Português
Relevância na Pesquisa
37.09%
Background: Decisions to initiate conservation programmes need to account for extant variability, diversity loss and cultural and economic aspects. Molecular markers were used to investigate if putative Algarvia animals could be identified for use as progenitors in a breeding programme to recover this nearly extinct breed. Methods: 46 individuals phenotypically representative of Algarvia cattle were genotyped for 27 microsatellite loci and compared with 11 Portuguese autochthonous and three imported breeds. Genetic distances and factorial correspondence analyses (FCA) were performed to investigate the relationship among Algarvia and related breeds. Assignment tests were done to identify representative individuals of the breed. Y chromosome and mtDNA analyses were used to further characterize Algarvia animals. Gene- and allelic-based conservation analyses were used to determine breed contributions to overall genetic diversity. Results: Genetic distance and FCA results confirmed the close relationship between Algarvia and southern Portuguese breeds. Assignment tests without breed information classified 17 Algarvia animals in this cluster with a high probability (q > 0.95). With breed information, 30 cows and three bulls were identified (q > 0.95) that could be used to reconstitute the Algarvia breed. Molecular and morphological results were concordant. These animals showed intermediate levels of genetic diversity (MNA = 6.0 ± 1.6...

Molecular characterization and genetic structure of the Nero Siciliano pig breed

Guastella,Anna Maria; Criscione,Andrea; Marletta,Donata; Zuccaro,Antonio; Chies,Luigi; Bordonaro,Salvatore
Fonte: Sociedade Brasileira de Genética Publicador: Sociedade Brasileira de Genética
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2010 Português
Relevância na Pesquisa
37.02%
Nero Siciliano is an autochthonous pig breed that is reared mainly in semi-extensive systems in northeastern Sicily. Despite its economic importance and well-appreciated meat products, this breed is currently endangered. Consequently, an analysis of intra-breed variability is a fundamental step in preserving this genetic resource and its breeding system. In this work, we used 25 microsatellite markers to examine the genetic composition of 147 unrelated Nero Siciliano pigs. The total number of alleles detected (249, 9.96 per locus) and the expected heterozygosity (0.708) indicated that this breed had a high level of genetic variability. Bayesian cluster analysis showed that the most likely number of groups into which the sample could be partitioned was nine. Based on the proportion of each individuals genome derived from ancestry, pigs with at least 70% of their genome belonging to one cluster were assigned to that cluster. The cluster size ranged from 7 to 17 (n = 108). Genetic variability in this sub-population was slightly lower than in the whole sample, genetic differentiation among clusters was moderate (F ST 0.125) and the F IS value was 0.011. NeighborNet and correspondence analysis revealed two clusters as the most divergent. Molecular coancestry analysis confirmed the good within-breed variability and highlighted the clusters that retained the highest genetic diversity.

Mirandês cattle breed: genetic base and breed improvement

Sousa, Fernando Ruivo de; Fragata, António
Fonte: Wageningen Pers Publicador: Wageningen Pers
Tipo: Conferência ou Objeto de Conferência
Português
Relevância na Pesquisa
37.02%
The "mirandês cattle breed has had a herd book since 1913 and the agricultural service has implemented a programme of genetic improvemment since the 70's. However, in spite of what has been expected, positive results weren't found on that programme and the "mirandês" cattle breed has gone into a decline. This paper analyses the strategies of several cattle breeder types and the genetic demographic structure of cattle within a community in northeast of Portugal.The present organization of the breed improvement, centered on cattle breeders of pure breed and on farms whith a great number of cows, does not permit genetic improvement. The alternative to the present situation consists of expanding the selection basis, integrating a conceptual level with all farmers. implementation of a process to work within the middle of a population of many breeders in the community.

Breed and ageing extent on carcass and meat quality of beef from adult steers (oxen)

Vieira, Ceferina; Cerdeño, Ana Isabel; Serrano, Emma; Lavín, Paz; Mantecón, Ángel R.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artículo Formato: 94510 bytes; application/pdf
Português
Relevância na Pesquisa
36.94%
8 pages, 5 figures.-- Available online Oct 11, 2006.; In Spain, there is increasing demand, mainly by restaurants and specialty markets, for beef from adult steers (oxen). Therefore, this study assessed the quality of meat from three breeds which show large differences in meat production, but were reared under the same production system and slaughtered at 42 months of age. The breeds evaluated include a specialized meat breed, Limousine (LIM), a dual-purpose breed, Brown Swiss (BS), and a local breed, Asturiana de los Valles (AV). Effect of ageing extent (14 vs. 28 days) was also evaluated. LIM showed the highest dressing percentage and best conformation score while AV oxen provided the lowest carcass weights. BS and LIM adult steers produced fatter carcasses and BS animals had the highest intramuscular fat content. With the exception of juiciness, which had slightly higher values in BS, breed had little effect on sensory parameters. Shear force values were slightly lower in meat aged for 28 days than in meat aged for 14 days. Regarding sensory parameters, ageing extent beyond 14 days just influenced odour intensity which had higher values in meat aged for 28 days.; Peer reviewed

Adult steers for beef production: breed effect on animal performance, retail yield and carcass quality

Vieira, Ceferina; Cerdeño, Ana Isabel; Serrano, Emma; Mantecón, Ángel R.
Fonte: Czech University of Agriculture, Prague Publicador: Czech University of Agriculture, Prague
Tipo: Artículo Formato: 181738 bytes; application/pdf
Português
Relevância na Pesquisa
36.94%
The production of adult steers for beef could be a profitable use of the territory in some mountain areas in the south of Europe, where this production is nearly inexistent, owing to an increase in the demand for meat from adult animals in specialized markets. The objective of this study was to evaluate the profitability of beef production in three breeds adapted to these areas but varying greatly in their mature size. The studied breeds were a specialized meat breed Limousin, a dual-purpose breed – Brown Swiss breed and – a Spanish local breed Asturiana de los Valles. Higher growth rates (P < 0.05) and higher carcass weights (P < 0.05) were achieved by Brown Swiss and Limousin. In relation to carcass value, better results of dressing percentage (P < 0.001), conformation (P < 0.001) and saleable meat percentages (P < 0.001) were obtained by Limousin. Due to preferences of the adult steers market for carcass with high fatness, Brown Swiss and Limousin could be more suitable to make this production profitable than Asturiana de los Valles (4.7 and 4.2 vs. 2.7, respectively, on the EUROP scale).; Peer reviewed

Lack of polymorphism in the oocyte derived growth factor (GDF9) gene in the Shal breed of sheep

Ghaffari,M.; Nejati-Javaremi,A.; Rahimi-Mianji,G.
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
Relevância na Pesquisa
36.87%
The families of TGF-β proteins are the most important growth factors in the ovary for growth and differentiation of early ovarian follicles. Three related oocyte-derived members of the transforming growth factor-β superfamily, namely GDF9, BMP15 and BMPR-IB have been shown to be essential for follicular growth and ovulation. The aim of the present study was to detect the incidence of mutation in exon two of GDF9 as a major gene in the Shal sheep breed. Blood samples were collected from 239 sheep and genomic DNA was extracted using the modified salting-out method. The quantity and quality of extracted DNA was examined using spectrophotometery and gel electrophoresis, respectively. A fragment with the size of 139 bp from exon two of GDF9 gene (FecG H) was amplified using polymerase chain reaction (PCR) with a pair of specific primers. The amplified PCR products were digested with DdeI restriction enzyme. In the presence of mutations at this locus, the DdeI enzyme cannot recognize the restriction site. However, in the absence of mutations, the enzyme recognizes one restriction site and divides the amplified fragment into two fragments of 31 and 108 bp. In the present study only the wild type alleles were detected and all the samples showed the AA genotype. The analysis of polymorphism for GDF9 (FecG H) loci in Shal sheep indicates that the genetic factor responsible for twinning or multiple lambing rates is not related to reported mutated alleles at the GDF9 major gene in this breed. Therefore...

The influence of boar breed and season on semen parameters

Knecht,D.; Środoń,S.; Duziński,K.
Fonte: South African Journal of Animal Science Publicador: South African Journal of Animal Science
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2014 Português
Relevância na Pesquisa
37.02%
The aim of the present study was to demonstrate the influence of boar breed and season on semen parameters. The research material consisted of 31 boars: Polish Large White (PLW), Polish Landrace (PL), and Duroc x Pietrain (D x P), aged 8 to 24 months. The analysed material consisted of 1390 ejaculates, collected during the period January 2010 to October 2012. Semen samples were assessed in terms of semen volume (mL), sperm concentration (x 10(6) m/mL), total number of sperm (x 10(9)), total number of live sperm (x 10(9)) and number of insemination doses obtained from one ejaculate (n). In winter, an increase in sperm concentration was observed for the PLW breed. Moreover, an increase in the volume of semen produced for this breed was noted in summer and autumn. Differences between breeds for the total number of sperm and total number of live sperm were observed for the winter and spring periods. The largest semen volume was noted for the PLW breed (276.4 ± 9.66 mL). However, in the analysis of other sperm parameters, boars of this breed demonstrated the poorest results. The highest insemination dose was obtained from breed D x P in winter (26.0 ± 0.51). Correlation analyses indicated that PLW and D x P boars are the least resistant to higher ambient temperatures...

Effect of heat stress on six beef breeds in the Zastron district: the significance of breed, coat colour and coat type

Foster,L.A.; Fourie,P.J.; Neser,F.W.C.
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
Relevância na Pesquisa
36.79%
A study was done to determine which factors had the greatest influence on a heifer's susceptibility to heat stress. Parameters tested were breed, coat colour, coat score, hide thickness, weight gain, respiration rate and body condition score. The study was conducted in the southeastern Free State. Afrikaner, Bonsmara, Braford, Charolais, Drakensberger and Simmentaler heifers were subjected to a heat tolerance trial. A total of 60 heifers, 10 of each breed were evaluated. Rectal temperature (Tre) was used as a parameter to determine heat stress. The heifers were evaluated on 10 days, at 14:00 during the winter of 2007 and on seventeen days, at 14:00 during the summer of 2007/8 (after 1 h in the sun, no access to shade). In winter a significant difference in rectal temperature Tre between breeds was measured on seven occasions. Phenotypical factors tested for did not affect Tre in winter. In summer significant differences in Tre were measured on 12 occasions between breeds. The following factors had a significant influence on Tre in the following breeds: Afrikaner - hide thickness, Bonsmara - hide thickness, Charolais - coat score.

Genetic diversity of limonero creole breed using Microsatellites molecular markers

Villasmil-Ontiveros,Yenen; Román Bravo,Rafael; Yáñez-Cuéllar,Luis; Contreras,Gloria; Jordana,Jordi; Aranguren-Méndez,José
Fonte: UNIVERSIDAD DEL ZULIA Publicador: UNIVERSIDAD DEL ZULIA
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2008 Português
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In order to study the genetic variability of the Criollo Limonero Breed, a dairy breed considered National Patrimony of Venezuela, 95 purebred animals were analyzed using 14 DNA microsatellites. The animals belonged to the local Carrasquero station, assigned to the National Institute of Agriculture Research of Zulia (INIA-Zulia) and located in the northwest of Zulia State. Average values of observed and expected heterocigocities (H O, H E), between families (HM O, HM E) respectively, exclusion probability (PE), Polymorphic Information Content (PIC) and number of alelles by locus were considered and discussed to measure the genetic diversity. The average of alleles by locus, H E and PIC were: 8.7; 0.689 and 0.651, respectively. H E ranged from 0.355 to 0.787 and PIC fluctuated from 0.302 to 0.757. The least polymorphic locus was ILST5 and the most polymorphic was the CSSM66. PE with the 14 markers was of 0.9962 and 0.9999 for one and both known parents, respectively. The results indicate that this set of markers are efficient to make paternity tests in this breed, it is also evident that there are heterozigosity levels indicating the existence of a high molecular diversity in this population, which should be maintained as a strategy for the conservation of the Criollo Limonero breed...