Soeparna and Setiawan, Rangga and Darodjah, Siti and Lestari, Tita Damayanti (2014) Effect of Progesterone Dose and Intravaginal Sponge Diameter on Reproductive Performance of Induced-Estrous Local Ewes in West Java. Indian Journal of Research, 3 (11). pp. 29-31. ISSN 2250-1991

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Abstract

The use of estrous induction technique is able to synchronize estrous of each ewe in order to increase the reproductive efficiency of livestock. However, the success rate of this technique is very dependent on the progesterone dose and its absorbance in the body. Therefore, this study was aimed to figure out reproductive performance of local sheep induced by the combination of progesterone doses and vaginal sponge diameters. 48 local ewes were used in this study and were grouped into 12 treatment groups. The treatments consist of the combination of progesterone doses (20, 30, and 40 mg) with vaginal sponge diameters (1, 2, 3, and 4 cm). The method used a randomized block design and the measured variables were: estrous response, pregnancy rate, litter size, and birth weight. The result showed that the highest estrous responses of the ewes were from the combination of sponge diameter 4 cm in all variation of progesterone doses. Meanwhile, the best pregnancy rate was found in the group of 20 and 30 mg progesterone dose in the diameter of 2 cm. However, this study did not find any difference among groups for litter size and birth weight. In conclusion, estrous induction using progesterone is effectively to synchronize estrous phase and pregnancy period of ewes, although it does not effect on litter size and birth weight of lamb Keywords : Local ewes, Estrous Synchronization, Progesterone, Sponge diameter

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