Efficiency in milk and calf yield for dairy cows: measurements, environmental factors, genetic parameters

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Efficiency in milk and calf yield for dairy cows: measurements, environmental factors, genetic parameters

Authors
Publisher
BioMed Central
Volume
14
Issue
4
Identifiers
DOI: 10.1186/1297-9686-14-4-584c
Keywords
  • Meeting Report

Abstract

A simple method for estimating a cow’s breeding value from her own lactations and her sire’s progeny test M. SCHNEEBERGER H. EUGSTER Herdebuchstelle fuer Braunvieh, Chamerstrasse 56, CH-6300 Zug, Schweiz A selection index including the cow’s own lactations and her sire’s progeny test was constructed to estimate routinely cows’ breeding values in the Swiss Braunvieh population. Lacta- tion yields are expressed as deviations from 3-year herd averages and corrected for genetic trend. Phenotypic and genetic variances and covariances were computed from progeny of 136 sires by MINQUE. Heritabilities were .16 for first, .13 for second, and .20 for third lactations. Genetic cor- relations were .93, .74 and .95 between first and second, first and third, and second and third lactations. Index weights are presented for various numbers of daughters in the sire’s progeny test. Sire evaluation for FCM yield in Sweden considering the maternal grandsire of the daughter J.A. ERIKSSON Brigitta DANELL SNS-Association for Swedish Livestock Breeding and Production, S-631 84 Eskilstuna, Sweden Dept of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, S-750 07 Uppsala, Sweden Dairy sires of the Swedish Red and White and Swedish Friesian breeds were evaluated for milk yield by two mixed models. The first model included fixed herd-year-seasons and sire group effects and a random sire effect and the second model also considered the maternal grandsire of the cow. The results show that the second model utilized the data more efficiently. A threefold increase in the ties between sires was obtained as well as an increased variation of the predicted differences. The correlations between the evaluations of the models were 0.98-I.00. Negative assortative matings were indicated among selected sires. Efficiency in milk and calf yield for dairy cows : measurements, environmental factors, genetic parameters R. ALEANDRI I. MAO A.M. PILLA * * Associazione Italiana Allevatori, v. Tomassetti

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