Absence of Quadratic Relationships Between Genetic Evaluations for Somatic Cell Scores and Udder Linear Traits
نویسندگان
چکیده
منابع مشابه
International Genetic Evaluations for Udder Health Traits in Dairy Cattle
Mark, T. 2005. International Genetic Evaluations for Udder Health Traits in Dairy Cattle. Doctoral dissertation. ISSN 1652-6880, ISBN 91-576-6992-9 The aim of this thesis was to investigate different approaches for international genetic evaluations of dairy sires for udder health traits. For this purpose, deregressed national genetic evaluations were used of Holstein milk somatic cell (SC) from...
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International genetic bull evaluations of somatic cell counts (SCC) from 8 different Holstein populations and clinical mastitis from 3 of these populations were inferred simultaneously using a multiple-trait-multiple-country evaluation (MT-MACE) model. This model considered effective independent weighting factors and multivariately deregressed national genetic evaluations for countries with mul...
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_______________________________________________________________________________________ Abstract Selection accuracy for resistance to mastitis may be increased by combining somatic cell score (SCS) and udder type into an udder health index, using genetic parameter estimates among them. A multi-trait animal model was used to estimate genetic parameters among lactation average SCS and udder type ...
متن کاملStandardization of lactation means of somatic cell scores for calculation of genetic evaluations.
Sample day records of means of somatic cell scores were analyzed to develop adjustments to standardize records for length of lactation. Estimates for effect of DIM were from a model that included random lactation and cow effects for lactations to date of 753,929 Holsteins and 21,842 Jerseys calving in Pennsylvania or Wisconsin from 1987 to 1991. Lactation, cow, and residual variances were estim...
متن کاملRelationships between evaluations of Canadian and USA Holstein bulls for longevity and somatic cell score
Canadian and United States evaluations of Holstein bulls were compared for longevity and somatic cell score. A total of 13 236 bulls was evaluated for longevity with 462 bulls having evaluations in both countries, and 10 945 bulls evaluated for somatic cell score with 564 bulls having evaluations in both countries. Multiple across country evaluation procedures were used to estimate the genetic ...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1993
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(93)77700-0