Page 44 - BBLP ejournal2018.docx

วารสารเทคโนโลยีชีวภาพการผลิตปศุสัตว์

Interaction Effect between Genetic and Environment for Milk Yield of Holstein Friesian Crossbred Dairy
Cattle in Western Part of Thailand

1
2
Somsak Prempree Roengwut Worawut

Abstract
Pedigree and phenotypic records of 3,110 cows that had first calving between 2000 to 2016 in 428 farm
located in western part of Thailand were tested the interaction effect of genetic and environmental factors on

accumulated 305 day milk yields (M305). Contemporary groups were define as herd-year-season of calving
subclass and they were connected through common sire. M305 that present in different topography or group of
farm management are assumed to be different. The topography were classified as Flat Plain (FP), Piedmont (PM),
and Coastal Pain (CP). For farm management were define as Free-Stall (FS) and Tie-Stall (TS). The multiple-
traits sire model considered regression on age of calving, breed groups and regression on heterosis as fixed effect,

and the random effects were contemporary group subclasses, sire, and residual effect. Variance components were
estimated using AI-REML procedure and then effect between genetic and environment was assumed if genetic
correlation estimates were less than 0.85. Spearman’s rank correlation coefficients were estimated between sire
rankings. If the rank correlation value equal to or higher than 0.70, the interaction had effect on EBV scaling,
otherwise it has effect re-ranking. Heritability of M305 were differed among three topography (ranged from 0.003
± 0.001 in CP to 0.195± 0.034 in FP) and farm management (ranged from 0.090 ± 0.041 for FS to 0.136± 0.060

for TS). Genetic correlation estimates ranged from - 0.99 (FP-CP) to 0.99 (PM-CP) for topography and 0.19 (FS-
TS) for farm management. The existence of interaction between genetic and environmental effects was found in
both changing EBV scale and rank of sires. These results imply the need to evaluate and consider sire for their
genetic ability (EBV) in the particular environments they were used

Keywords: dairy cattle, interaction effect between genetic and environment, milk production, Thailand

Registered No. : 60(2)-0208-037
1 Bureau of Biotechnology in Livestock Production, Department of Livestock Development, Patumthani, 12000
2 Ratchaburi Artificial Insemination and Biotechnology Research Center, Nongpho, Photharam, Ratchaburi, 70120

34