مقارنة الأداء الإنتاجي لنعاج خط ثنائي الغرض بأداء نعاج خطي الحليب و اللحم في أغنام العواسي : أوزان المواليد و معدلات نموها

الملخص EN

This study was conducted at the Agricultural Research Center in Salamieh / General Agricultural Scientific Research Commission, (GCSAR), within the framework of cooperation with the Arab Center for the Studies of Arid Zones and Dry Lands (ACSAD).

Production records of 192 Awassi ewes of three production sheep lines (milk, meat and dual purposes line) of first parturition during 2009 were used, to evaluate ewe production performance of dual purposes line and its comparison with the production performance of milk and meat lines and to study the effect of non some factors that affect ewe production, type of parturition, lamb's sex on birth, in addition to the effect of ewe weight on lamb's weight at birth , weaning (60days) and at 90 and 180 days and studying daily growth rate for the period of before weaning until 180 days.

Data were statistically analyzed using Least Squares methods of SAS.

Means of lamb's weight at birth, weaning age, and 90 and 180 days were 4.38, 16.25, 28.94, and 32.97 kg while, the pre- and post weaning growth rate were 204.90 and 136.21 g per day, respectively.

The results also indicated that all studied traits were significantly (P<0.01, P<0.05) affected by most factors except ewe production lines which did not affect pre weaning growth rate, and type of birth did not affect post weaning growth rate.

While, lamb's sex on birth and weaning weight and post weaning growth rate were the important traits in sheep breeding and production.

Meanwhile, ewe lambing weight did not affect any of studied traits.

Lamb's of dual purposes line were significantly (P<0.05) exceeded milk and meat lines in all studied traits.

Number of weaning lambs were not affected by ewe production lines and ewe weight in all ewe performance traits.

The recorded means of litter weight at birth and weaning age and the number of lambs were 6.60, 26.54 kg, and 1.65 lambs respectively.

Moreover, meat production lines surpassed (P<0.05) over milk and dual purpose lines in litter size.