Bayesian estimates of genetic changes for body weight traits of Moghani sheep using Gibbs sampling |
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| Authors: | Navid Ghavi Hossein-Zadeh |
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| Institution: | (1) Department of Animal Science, Faculty of Agriculture, University of Guilan, P.O. Box 41635-1314, Rasht, Iran |
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| Abstract: | The objective of the present study was to estimate genetic changes of body weight at different ages in Moghani sheep. Traits
included were birth weight (BW, n = 4,208), 3-month weight (3MW, n = 4,175), 6-month weight (6MW, n = 3,138), 9-month weight (9MW, n = 2,244), and yearling weight (YW, n = 1,342). Data and pedigree information used in this study were collected at the Breeding Station of Moghani sheep during
1989–2005. The analysis was carried out for five traits, using the MTGSAM program. Breeding values of individual animals were
obtained from a multivariate animal model analysis and genetic trends were obtained by regressing the means of predicted breeding
values on year of birth for each trait. Direct genetic trends were positive and significant (P < 0.05) for BW, 3MW, 6MW, 9MW, and YW and were 1.63, 69.20, 79.38, 66.83, and 110.22 g/year, respectively. Also, maternal
genetic trends for BW, 3MW, 6MW, 9MW, and YW were positive and significant (P < 0.05) and were 2.36, 49.18, 37.33, 17.73, and 9.67 g/year, respectively. The results showed that improvement of body weights
of Moghani sheep seems feasible in selection programs. |
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