Genetic parameter estimates in the South African Jersey breed
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چکیده
منابع مشابه
Short Communication Genetic parameter estimates for functional herd life for the South African Jersey breed using a multiple trait linear model
________________________________________________________________________________ Abstract Longevity reflects the ability of a cow to avoid being culled for low production, low fertility or illness. Longevity can be used in breeding programmes if genetic parameters are known. Various measures are used for longevity. In this study survival in each of the first three lactations was analysed. Survi...
متن کاملRelationships between functional herd life and conformation traits in the South African Jersey breed
The genetic relationship between conformation traits and functional herd life of the South African Jersey population was investigated. Data on conformation traits (n = 46 238) and functional herd life (n = 90 530) on registered South African Jersey cows calving between 1989 and 2008 were obtained from the Integrated Registration and Genetic Information System. Conformation traits were scored us...
متن کاملEstimates of genetic parameters and effect of inbreeding on milk yield and composition in South African Jersey cows
________________________________________________________________________________ Abstract The effect of inbreeding on the 305-d yields of milk, fat and protein, and the percentages of fat and protein in the first three lactations was estimated using records on the South African Jersey cows that participated in the National Dairy Animal Improvement Scheme. Inbreeding coefficients were estimated ...
متن کاملGenetic Analysis of Type Traits for the Italian Jersey Breed
Anafi (Associazione Nazionale Allevatori Frisona Italiana) is also in charge of the Italian Jersey cattle genetic evaluations. Since interest about this dairy breed is steadily mounting, (co)variance components for 16 type traits of Italian Jersey cows were estimated, in order to start thinking of how to develop a new and more comprehensive selection index. The canonical transformation, in the ...
متن کاملGenetic Parameter Estimates for Calving Difficulty and Birth Weight in a Multi-breed Population
Birth weight (BWT) and calving difficulty (CD) were recorded on 4,580 first parity females from the Germplasm Evaluation (GPE) program at the U.S. Meat Animal Research Center. Both traits were analyzed using a bivariate animal model with direct and maternal effects. Genetic groups for breed of AI sire were fitted to estimate breed differences. Bos Indicus influenced breeds tended to have the la...
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ژورنال
عنوان ژورنال: South African Journal of Animal Science
سال: 2009
ISSN: 2221-4062,0375-1589
DOI: 10.4314/sajas.v28i3.44230