تأثير مستوى التغذية قبيل المعاملة الهرمونية على الخصائص التناسلية للأغنام النعيمية

Abstract EN

This study aimed to investigate the response of Naimi ewes to hormonal treatments under two levels of nutrition: estrous synchronization and twining rates.

The ewes were divided into two equal groups of similar weights and impregnated with vaginal sponges )MAP( for 14 days and then injected with 500 I.U.

Pregnant Mare Serum Gonadotropin )PMSG( at sponges with drawl.The first group of ewes were fed with 25% extra quantity of concentrates for 30 days following mating.The results indicated that all the ewes that were treated with vaginal sponges had experienced estrous synchronization and had also been mated by the fertile rams, as follows 62.5% and 60% showed estrous synchronization in the first and second groups, respectively all the ewes that were mingled with fertile rams had lambed by the end of their pregnancies.

The percentages of lambing in Groups 1 and 2 were 140% and 134% respectively )Group 1 was 140% and Group 2 as 134%(.

The average live weights of male lambs were higher than that of female lambs )p< 0.05(.

Furthermore, the results showed that there were significant effects on the weights and body conditions of the ewes and on the birth weights of the lambs.

In Group 1, the ages of the ewes had a significant effect on pregnancy rates )p< 0.05(.

There were significant differences between the two groups in the birth weights, number, and pregnancy rates of the lambs )p< 0.05(, while there were no differences between the two groups in pregnancy lengths.

From the results obtained, it was concluded that, flushing the animals with 25% more concentrate than the basal diet improved the reproductive performance of Naimi ewes in terms of increased conception rates, number of twins, and improved birth weights.

Ewe fertility and number of twins affected significantly by the age and body condition scores in this study.