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Title: GENETIC PARAMETERS AND ENVIRONMENTAL FACORS FOR GROWTH TRAITS IN BALI CATTLE

Author
item PRAHARANI, L.
item Riley, David
item OLSON, T.

Submitted to: Journal of Animal Science Supplement
Publication Type: Abstract Only
Publication Acceptance Date: 8/10/2005
Publication Date: 8/10/2005
Citation: Praharani, L., Riley, D.G., Olson, T.A. 2005. Genetic parameters and environmental facors for growth traits in bali cattle [Abstract]. Journal of Animal Science Supplement. 83(1):14

Interpretive Summary:

Technical Abstract: A genetic evaluation of Bali Cattle (Bos javnicus) using data collected from the Bali Cattle Improvement Project on the island of Bali was conducted to determine the non-genetic and genetic parameters influencing growth traits and to evaluate their phenotypic and genetic trends. There were 7,980 calves born from 1985 through 2000. Traits evaluated were weight5 at 190 days (W-190d) and 350 days (W-350d) A connectedness program was used to evaluate genetic linkages between contemporary groups defined as a location year-season combination. variance components were computed by the AsREML using two-trait animal models that included contemporary group (CG), sex of calf, cow age, and the sex of calf by cow age interaction as fixed effects and calf age as a covariate. Genetic trends were plotted as average of estimated breeding values on year of birth. All non-genetic effects including CG, calf age (in W-190d), calf sex (in W-350d), and cow age x calf sex (in W350d) were found significant (P<0.05). Estimates of direct additive heritability were 0.3 and 0.5 for W-190 and W-350dm respectively. The estimated maternal heritabilities were not different from 0. The estimated correlations between W-190d and W-350d were 0.74 (genetic), 0.19 (environmental) and 0.33 (phenotypic). These findings suggest that the genetic progress for W-350d might be expected to be faster than at for W-190d and increasing W190d can be achieved by selection for W-350d since their genetic correlation was strong and positive. Failure to detect significant maternal effects may have been due to the unique management system (small shareholders with one or a few cattle) or there may have been inadequate pedigree/data structure for estimation. The decline in W-350d (P<0.01) might be caused by factors other than genetic due to the observed genetic trend of W-190d and W-350d.