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ROLE OF SOME GENETIC AND ENVIRONMENTAL FACTORS IN GROWTH TRAITS OF TURKISH AWASSI, LOCAL AND CROSSBRED LAMBS | ||
| The Iraqi Journal of Agricultural Science | ||
| Article 1, Volume 41, Issue 3, 2010, Pages 12-22 | ||
| Authors | ||
| S. M. Edriss; S. I. Said; A. I. Khalaf | ||
| Abstract | ||
| This experiment was carried out at the Sheep and Goat Research Station /Abu Ghraib (24 km west of Baghdad), and over a period from 2007 to 2008 using 1095 records for birth weight and 592 records for weaning weight and average daily gain from birth to weaning (growth rate) in Turkish Awassi, Local and Crossbred flock. The aim of this study is to investigate the effect of some genetic and environmental factors (genetic groupe - year of birth, dam age at birth, sex, birth type and lambing month) on the studied traits by using least squares method for analysis of data. The overall means for birth weight, weaning weight and growth rate were 3.51 kg , 27.75 kg and 202 g/day, respectively. The least squares means for birth weight, weaning weight and growth rate of the Awassi Turkey sheep for the year 2007 were 3.51 kg, 34.27 kg and 253 g/day and for the year 2008 were 3.99 kg, 26.08 kg and 185 g/day, respectively, while the least squares means for the same traits of the Local Awassi sheep for the year 2007 were 3.09 kg, 27.85 kg and 208 g/day, respectively. The least squares means for birth weight, weaning weight and growth rate from birth to weaning of the Crossbreed Awassi for the year 2008 were 3.44 kg , 22.80 kg and 162 g/day, respectively. There were a highly significant effect for the fixed effects (genetic group - year of birth, sex, birth type and lambing month) on the weight at birth, weaning and the growth rate traits. Regression coefficient of weaning weight on weaning age were 0.014±0.02 kg/day showed no significant, while the regression coefficient of growth rate on weaning age were - 0.0015±0.00018 g/day showed a highly significant. | ||
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