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GENETIC PARAMETERS AND BREEDING VALUES FOR GROWTH TRAITS IN TURKISH AWASSI LAMBS AS A TOOL FOR SELECTION | ||
| The Iraqi Journal of Agricultural Science | ||
| Article 1, Volume 41, Issue 3, 2010, Pages 1-11 | ||
| Authors | ||
| S. M. Edriss; A. I. Khalaf; S. I. Said | ||
| Abstract | ||
| This experiment was carried out at the Sheep and Goat Research Station /Abu Ghraib (24 km west of Baghdad) during the period between 1/7/2008 to 20/6/2009. The objective of the present study was to evaluate the Turkish Awassi lambs, genetically, for the average daily gain from birth to weaning trait through estimating the breeding values of the ewes. The effect of some genetic and environmental factors on the studied traits were estimated. Data were analyzed to estimate the heritabilities and repeatabilities for growth traits. Breeding values for average daily gain were estimated (176 lambs of 155 ewes for the year 2007 and 278 lambs of 234 ewes for the year 2008 and 216 lambs of 170 ewes for the year 2009). General Linear Model (GLM) procedure in the SAS computer package was used for estimating the fixed and random effects. Breeding values for the growth rate were estimated using the Fox-Pro program. The heritabilities for birth weight, weaning weight and growth rate were 0.17, 0.07 and 0.09, respectively. The repeatabilities for birth weight, weaning weight and growth rate for the years 2007 and 2008 were 0.21, 0.33 and 0.29, respectively. The highest mean index of the ewe (breeding value + 100) for the average daily gain from birth to weaning in 2007 was 115, while the lowest of mean index of ewe was 89, and reached the highest (110) and lowest (81) of mean index of ewe for the same trait in 2008 for the same flock. The highest and lowest values for mean index of ewe in 2009 to the flock was 120 and 0, respectively. In conclusion, the estimate of the breeding values by using cumulative records was recommended as a tool for selection for growth rate. | ||
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