Olutunmogun, A.K Analysis of Body Weight and Egg Production Traits of Shikabrown® Grandparent Chickens after Long-Term Selection
Abstract
Abstract
This study analyzed performance of the sire and dam lines of ShikaBrown® grandparent chickens after a long-term selection. This chicken breed had under gone different generation of selection on growth (body weight) and layer economic traits. The growth and egg production traits considered were body weight, age at first egg, egg weight, egg number and hen-day egg production. The estimation of genetic parameters was also analyzed from a previous pedigree data over five generations. The Least Square Means of combined body weights (cocks + hens) showed that the dam line had a significantly (p<0.05) heavier weight at day old (32.29g) than the sire line (30.29g) while at weeks 8 (576.2g vs 556.71g) and 16 (1684.44g vs 1579.0g), the sire line had a significant (p<0.05) higher body weights than the dam line. The egg production analyses showed that egg number and hen day percent were higher in the dam line in both short- and long-term analyses while sire line had higher egg weight average. The genetic correlation showed that egg number had a negative correlation with age at sexual maturity and egg weight averages in the generations considered. However, the genetic analyses of egg number with body weight were positively correlated in all generations for both lines. The positive genetic correlations suggest the usefulness of body weight as a selection criterion for genetic improvement of egg number in these lines of chickens while the negative genetic correlation which egg number had with ASM and EWTAV is an indication of interplay of similar gene flow or some other confounding factors during the selection for the traits.
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References
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