Effet de la synchronisation et de l’insémination artificielle sur les performances de reproduction et la productivité de l’élevage ovin dans la région semi aride Algérienne.

Abstract

The artificial insemination (AI) is a significant biotechnological tool for the improvement of animal’s genetic selection. The objective of our study is to show the effect of synchronization and the AI on the performances of both reproduction and productivity at the race Ouled Djellal raised in pastoral system in the Algerian semi arid area, the study related to 193 ewes from 2 to 6 years old and with a body score from 1 to 4.75 divided into two batches, the first undergoes an allin wrestling whereas the second undergoes an induction and a synchronization of heats by vaginal sponges of FGA (40mg) during 14 days, follow-ups by an injection of PMSG. The ewes were inseminated 55 hours after the withdrawal with fresh sperm prepared in two different diluters. The AI is not influenced by the studding factors. However The AI acts significantly on reproductive performance (p <0.001), it provides fertility rates (43%) and fertility (63%) low. Catch-up after the catching up to achieve these rates increase (94%) and (119%) and become comparable to rates found in the control group (93%) and (109%). The rate of prolificacy is significantly higher in the ewes inseminated (126%) compared to those fought naturally (117 %) (p<0, 05). Our results show also a significant increase in the rates of and ponderal productivity (26,4kg/ewe) in the ewes inseminated compared to 17, 8kg/ewe in the control batch with p<0,001. In conclusion, the AI is recommended in our breeding to improve the performances of reproduction and productivity.