International Genetic Evaluation of Dairy Sires Using a Multiple-Trait Model with Individual Animal Performance Records
نویسندگان
چکیده
منابع مشابه
Application of a multiple-trait herd cluster model for genetic evaluation of dairy sires from seventeen countries.
The multiple-trait across country evaluation method is currently used for international genetic evaluation of dairy sires. This method simultaneously combines national estimated breeding value (EBV) of sires in all countries and produces a separate breeding value to be used in each of the 24 countries that participate in the service. The major drawbacks to this method are the large number of ge...
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International genetic evaluation of dairy sires is currently a two-stage process. Sire EBV are first calculated at the national level based on data of local progeny, then these national EBV are combined into international EBV at the Interbull Centre. However, differences in within-country procedures for data collection and genetic evaluation can affect the results, and traits or production envi...
متن کاملA multiple-trait herd cluster model for international dairy sire evaluation.
International dairy sire evaluations have traditionally been calculated using a two-step process. Lactation records within each country are used to predict national estimated breeding values, then these national breeding values are transformed to the genetic base, scale, and units of measurement of other countries by using conversion formulae or the multiple-trait, across-country evaluation met...
متن کاملRanking Dairy Sires by a Linear Programming Dairy Farm Model
Dairy sires were ranked for overall merit by an average daughter's contribution to farm net profit. Biological characteristics of sires and economic factors of a dairy farm were linked by linear programming. Availability and constraints of resources were in the model. Average daughter's returns over variable costs attributable to sire proofs for several traits was the measure of sire's net meri...
متن کاملEvaluation of performance-tested boars using a single-trait animal model.
Data structure designs for breeding value estimation of performance-tested boars using mixed-model methodology were compared. Computer models were based on estimates of parameters from the literature and from results of a survey of test station managers. Results were compared using accuracy (the correlation of true and estimated breeding values) and prediction error variance (PEV). The single-t...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 2001
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(01)74734-0