Genetic and phenotypic parameter estimates for reproduction traits in indigenous Arsi-Bale goats |
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Authors: | Tesfaye Kebede Aynalem Haile Hailu Dadi Tesfaye Alemu |
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Institution: | (1) Adami Tulu Agricultural Research Center, P.O. Box 35, Zeway, Ethiopia;(2) International Center for Agricultural Research in the Dry Areas, P.O. Box 5466, Aleppo, Syria;(3) Department of Animal Science, Chungbuk National University, Cheongju, 361-763, South Korea |
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Abstract: | The study was conducted to evaluate reproductive performances and estimate genetic parameters for reproduction traits in Arsi-Bale
goats. A total of 792 kidding records collected from 2001 to 2007 were used. Parity of dam, year, season and type of kidding
were investigated as fixed effects by PROC GLM of SAS. Derivative-Free Restricted Maximum Likelihood (DFREML) method was used
to estimate genetic parameters by fitting four animal models. Parity of dam and year of kidding influenced (P < 0.05) all the traits. The overall means for age at first kidding (AFK), kidding interval (KI), litter size at birth (LSB),
litter size at weaning (LSW), litter weight at birth (LWB), litter weight at weaning (LWW), abortion and dystocia were 574.9 ± 8.3 days,
280.0 ± 13.7 days, 1.6 ± 0.03, 1.37 ± 0.03, 3.7 ± 0.08 kg, 9.11 ± 0.38 kg, 3.8% and 0.13%, respectively. The estimates of
direct additive heritability for the traits, except for abortion and dystocia, under the best model (direct animal for AFK
and repeatability model for other traits) were 0.245 ± 0.19, 0.060 ± 0.08, 0.074 ± 0.05, 0.006 ± 0.05, 0.125 ± 0.05, 0.053 ± 0.07,
respectively, while the corresponding permanent environmental effects were 0.00 ± 0.00, 0.07 ± 0.07, 0.08 ± 0.05, 0.172 ± 0.06,
0.03 ± 0.04 and 0.07 ± 0.05, respectively. Repeatability estimates for KI, LSB, LSW, LWB and LWW were 0.13, 0.15, 0.18, 0.16
and 0.12, respectively. Genetic correlations between reproductive traits vary from medium to high. Arsi-Bale goats have good
reproductive performance with low incidence of reproductive disorder. Except for AFK, other traits have low estimates of heritabilities
with high genetic correlation among the traits. Repeated measures of the traits are needed before deciding to keep or cull
the animal. |
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