Page 57 - BBLP ejournal2018.docx

Journal of Biotechnology in Livestock Production

Genetic Trend for Milk Yield and Milk Composition of Holstein Friesian Crossbred Dairy Cattle in Western
Part of Thailand

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1
Roengwut Worawut Somsak Prempree

Abstract
Heritability and genetic correlation for milk production and milk composition were estimated using
accumulated data of 305 days milk yields (M305), milk fat percentage (PFAT), milk protein percentage (PPRO),

and total solid percentage (PTS) from 3,110 Holstein Friesian crossbred cows that calved and milked between
2000 to 2016 in 428 farms located in western part of Thailand. The multiple-traits animal model with repeated
traits considered contemporary group (herd-year-season of calving), lactation number, regression on calving age,
breed groups, and regression on heterosis as fixed effects and the random effects were animal, permanent
environment and residual. Variance components were estimated using AI-REML procedure. Heritability estimates

for M305, PFAT, PPRO, PSNF and PTS were 0.129, 0.041, 0.102, and 0.079, respectively. Genetic correlation
among milk yield and milk composition traits ranged from - 0.159 (M305-PSNF) to - 0.384 (M305-PFAT) and
range from 0.495 (PFAT-PPRO) to 0.989 (PFAT-PTS) among milk composition traits. Genetic trend for M305 was
7.61 kg per year and genetic trend for milk composition were all nearly zero. Breeding program that base on
outstanding in milk production dairy cattle will effect on milk composition. The selection index is recommended to
be used for sire and dam selection to optimize genetic gain for multiple traits selection in western Thailand dairy

cattle genetic improvement.

Key words : Holstein freesian crossbred, Genatic trend, Milk yield, Milk composition

Registered No. : 60(2)-0208-036
1 Ratchaburi Artificial Insemination and Biotechnology Research Center, Nongpho, Photharam, Ratchaburi, 70120
2 Bureau of Biotechnology in Livestock Production, Department of Livestock Development, Patumthani, 12000

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