Use of test day milk yield records for genetic evaluation in Sahiwal cattle.
Date
2006-08Author
Ilatsia, ED
Muasya, TK
Muhuyi, WB
Kahi, AK
Type
Book chapterLanguage
enMetadata
Show full item recordAbstract
Test day milk yield (TMY) records from the first three lactations were used to estimate genetic and phenotypic parameters in the Sahiwal cattle in Kenya, using animal models in multivariate analyses. In the first analysis, a multivariate repeatability model was used where the TMY records within lactation were considered as repeated traits and the three lactations treated as separate traits. In this case, heritability estimates ranged from 0.22 to 0.30 and were highest in lactation two. In the second analysis, eight TMY in the three lactations were considered as separate traits. In this case heritability estimates ranged from 0.25 to 0.30 and genetic correlations among TMY ranged from 0.34 to 0.68. The results of this study show that TMY could be used in genetic evaluation in Sahiwal cattle.
Citation
Proceedings of the 8th World Congress on Genetics Applied to Livestock Production, Belo Horizonte, Minas Gerais, Brazil, 13-18 August, 2006 2006 pp. 01-61Publisher
University of Nairobi Faculty Of Veterinary Science