Evaluation Genetic and Phenotypic of Some Productive Traits on Shami Goats, (in Syria)
2022
Al-Najjar, Khaled | Al-Aghbari, Abdulwali M | Dawa, Mahmoud | Kamel, Fattal
This research was carried out in Karahta (Damascus countryside), Kawdanah (Al-kouneitra), and Hamimah (Aleppo) stations, under the control of the Administration of Animal Wealth Research during 2014.The objectives of the research were to evaluate some productive traits (birth weight, weaning weight, and milk yield) throughout the years of 2002 to 2010.SAS (1996) program was used and the application of Main Model, General Linear Model (GLM) were used to estimate Least Square Mean(LSM) for the productive traits. The effect of some non-genetic factors were studied (production year, sex of newborn, type of birth, goat stations, age of goats at kidding) on the productive studied traits. MTDFreml was used to estimate the genetic parameters (heritability, correlations) for the studied traits and additive genetic for each animal on studied traits using Animal Model by Multitraits analysis. The results showed that, the estimation values of LSM of birth weight, weaning weight and milk yield were 3.57±0.08, 11.79±0.35, and 486.5±18.09 kg, respectively. It should that environmental studied factors (year of productive, sex of newborn, type of birth, goat stations, age of goats at kidding) were effected (P<0.01) on all studied productive traits, except sex of newborn was non effect on milk yield (P>0.05).Heritability estimation were 0.39±0.024, 0.32±0.023, 0.52±0.021 for birth weight, weaning weight, milk yield respectively. Genetic correlation between birth weight and of each weaning weight and milk yield were 0.21±0.061, 0.05±0.011, respectively, while genetic correlation was 0.06±0.010 between weaning weight and milk yield. The annual additive genetic change values were-0.0060±0.0049, 0.0545±0.0287, and -0.6415±1.1627, while the annual phenotypic change values were -0.0325±0.0062, -0.0145±0.0914, and-4.6628±4.0283 for birth weight, weaning weight, milk yield respectively. All annual additive genetic and phenotypic changes were not significant (P>0.05), except phenotypic change for birth weight was highly significant (P<0.01).Conclusions of research: one year old goats must be not used in mating season for increasing studied productive traits(birth weight, weaning weight, and milk yield). Genetic selection may improve studied productive traits because of high heritability values. Genetic correlation showed low values, so selection for any studied productive traits will not affected another traits. Each of additive genetic and phenotypic traits must depend on goats selection for the studied productive traits because of the low genetic changes and the non-significant on Shami goats
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