Potential Impact of Bovine Somatotropin on Dairy Sire Evaluation
نویسندگان
چکیده
منابع مشابه
Potential Impact of Bovine Somatotropin on Dairy Sire Evaluation
Use of bovine somatotropin to increase product ion of milk and milk solids poses the problem of allocation within herd and implications for genetic evaluatat ion records with and without bovine somatotropin were simulated for different correlations between performance with and without t reatment and response to it. Resulting within-herd variances and accuracy and bias in sire evaluations were c...
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Data from a national survey representative of U.S. dairy operations were used to assess adoption and the production and financial impacts of recombinant bovine somatotropin (rbST). Adoption rates of rbST varied significantly across the nation, but were higher among larger diary operations in all regions. However, the scale bias of rbST adoption was substantially diminished when the influence of...
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The effects of heterogeneity of variance among herds on dairy sire evaluation were examined. Data consisted of 111,196 first lactation Holstein production records of heifers calving in Ontario between 1978 and 1983. To account for selection, older sires without first crop daughters in the data were treated as fixed effects. Herds were classified into one of nine groups based on their estimated ...
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The environmental impact of using recombinant bovine somatotropin (rbST) in dairy production was examined on an individual cow, industry-scale adoption, and overall production system basis. An average 2006 U.S. milk yield of 28.9 kg per day was used, with a daily response to rbST supplementation of 4.5 kg per cow. Rations were formulated and both resource inputs (feedstuffs, fertilizers, and fu...
متن کاملPredicting Bovine Somatotropin Use by California Dairy Farmers
An ex ante adoption model of bovine somatotropin (BST) is estimated with survey data of California milk producers. Theoretical justification is developed for incorporation of socioeconomic explanatory variables in a technology-adoption model. The advantages of a multinomial over a binomial ex ante model also are presented. The multinomial logit model is used to predict BST adoption, to test hyp...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1988
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(88)79795-7