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Genetic Variation in Growth and Body Dimensions of Jersey and Limousin Cross Cattle. 2. Post-Weaning Dry and Wet Season Performance
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 Title & Authors
Genetic Variation in Growth and Body Dimensions of Jersey and Limousin Cross Cattle. 2. Post-Weaning Dry and Wet Season Performance
Afolayan, R.A.; Pitchford, W.S.; Weatherly, A.W.; Bottema, C.D.K.;
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 Abstract
The importance of direct genetic, maternal, heterosis and epistatic effects were examined on post-weaning weight, height, length, girth, fat depth and muscle (ratio of stifle to hip width) with dry and wet season gains in these traits. The breeds used were two pure breeds (Jersey and Limousin), the LimousinJersey , and two backcrosses (Jersey dams and Limousin dams). Direct genetic effects were large (p<0.001) for all traits except for length. Jersey maternal effects were large for weight, girth, fat depth and muscle in the post-weaning wet season gains which is an evidence of the impact of Jersey dam on progeny beyond weaning. There were large heterosis effects on fat depth and muscle relative to other traits. Epistatic effects were observed for post-weaning performance in weight, girth, fat depth and muscle. There are indications that there were different genetic effects for post-weaning compared to preweaning growth traits. Thus, it could be hypothesized from this study that different quantitative trait loci (QTL) affect early and late growth in Jersey and Limousin cross cattle breeds. The follow up work will examine the different chromosomal gene effects on pre- and post-weaning growth.
 Keywords
Genetic Effects;Weight;Height;Fat Depth;Muscle;
 Language
English
 Cited by
 References
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