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Genetic and environmental effects on milk yield of Pitangueiras cattle

Published online by Cambridge University Press:  02 September 2010

R. B. Lôbo ,
F. A. M. Duarte ,
A. A. M. Gonçalves ,
J. A. Oliveira  and
C. J. Wilcox
R. B. Lôbo
Affiliation:
Department of Genetics, Faculty of Medicine of Ribeirāo Preto, USP, 14100 Ribeirāo Preto, Sāo Paulo, Brazil
F. A. M. Duarte
Affiliation:
Department of Genetics, Faculty of Medicine of Ribeirāo Preto, USP, 14100 Ribeirāo Preto, Sāo Paulo, Brazil
A. A. M. Gonçalves
Affiliation:
Department of Genetics, Faculty of Medicine of Ribeirāo Preto, USP, 14100 Ribeirāo Preto, Sāo Paulo, Brazil
J. A. Oliveira
Affiliation:
Department of Zootechny, Faculty of Agronomy of Ilha Solteira, UNESP, 15378, Ilha Solteira, Sāo Paulo, Brazil
C. J. Wilcox
Affiliation:
Dairy Science Department, Institute of Food and Agricultural Science, University of Florida, Gainesville, Florida 32611, USA
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Abstract

Data from 5270 lactation records of 1380 cows sired by 132 bulls and recorded from 1962 to 1977 were analysed. Statistical analyses, using least squares and maximum likelihood methods, showed significant effects for genetic group, age of cow, month and year of calving, and lactation length. Overall mean milk yield was 2780 kg (CV = 0·31) with mean lactation length of 281 days. Maximum production occurred in the fifth lactation (104 or 105 months of age at calving) with a yield of 1·3 times that of the first lactation. Repeatability estimated by intraclass correlation was 0·40 (s.e. 0·03). Heritability estimated from paternal half-sib correlation was 0·16 (s.e. 0·06). Overall results were very similar to those obtained from research with European breeds in temperate areas.

Type
Research Article
Information
Animal Production , Volume 39 , Issue 2 , October 1984 , pp. 157 - 163
Copyright
Copyright © British Society of Animal Science 1984

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References

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