| Bias in genetic evaluations by records of cows treated with bovine somatotropin. | |
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MedLine Citation:
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PMID: 11104285 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Records from Dairy Records Management Systems in Raleigh were used to estimate effects of bovine somatotropin (bST) treatment and to predict breeding values for milk production traits. The data comprised 5245 test-day records of bST-treated cows and 126,223 test-day records of untreated cows in first lactation for milk, fat, and protein yields. Fixed effects of bST treatment were estimated from test-day animal models with herd-test-date as another fixed factor. Percentage increases due to bST treatment ranged from 7 to 8% for test-day milk, fat, and protein yields. Random regression coefficients for additive genetic and permanent environmental effects were included in the model. To assess the potential for bias in genetic evaluations when some and not all cows are treated with bST, breeding values predicted by the test-day model with and without effects of bST treatment were compared for cows and sires. Correlations between breeding values predicted from models with and without effects of bST treatment were 0.99. However, relatively large bias was found for individual animals. This result suggests that bias in genetic evaluation caused by ignoring bST treatment may be significant. |
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Authors:
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S Tsuruta; J F Keown; L D Van Vleck; I Misztal |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of dairy science Volume: 83 ISSN: 0022-0302 ISO Abbreviation: J. Dairy Sci. Publication Date: 2000 Nov |
Date Detail:
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Created Date: 2001-02-28 Completed Date: 2001-03-15 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 2985126R Medline TA: J Dairy Sci Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 2650-6 Citation Subset: IM |
Affiliation:
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Department of Animal Science, University of Nebraska, Lincoln 68583-0908, USA. shogo@arches.uga.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Bias (Epidemiology)* Cattle / genetics* Dairying / methods Female Growth Hormone / pharmacology* Lactation / genetics, physiology* Milk / chemistry, drug effects*, secretion* Records as Topic Regression Analysis |
| Chemical | |
Reg. No./Substance:
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9002-72-6/Growth Hormone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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