Optimum Time of Artificial Insemination in Simmental Cross Cow
Firmiaty, S.1, M. idrus1, M. Amir2 and A.L. Toleng3
1Agriculture Faculty, Bosowa University, Makassar, 2Department of Livestock Services, Bone, 3Faculty of Animal Science, Hasanuddin University, Makassar, Indonesia
Abstract
Abstract. Artificial insemination (AI) conducted not at the optimum time might cause the low conception rate in beef cattle kept under extensive and semi extensive condition. The aim of this research was to evaluate of the optimum time of artificial insemination which shows a high conception rate in Simmental cross cows kept under semi extensive condition. There were 75 Simmental cross cows kept under semi extensive by farmers at Bone District, South Sulawesi, Indonesia. They were divided into 3 groups of 25 cows. Group 1 (G1) was inseminated 12 h after the onset of estrus, Group 2 (G2) 24 h after the onset of estrus and Group 3 (G3) 36 h after the onset of estrus. All cows inseminated using Bali bull frozen semen by 1 inseminator. The cows which showed estrus after the AI were inseminated. The variables observed were Conception Rate (CR) and Service per conception (S/C). The significant different between group were analyzed by chi square analysis. Conception rate in G1 group was significantly (P<0.05) lower (56%) in compared to those in G2 (80%) and G3 (80%), respectively. Similar response was detected for S/C. Service per Conception in G1 group was significantly (P<0.05) higher (1.92) in compared to those in G2 (1.32) and G3 (1.38), respectively. It can be concluded that optimum time for artificial insemination in Simmental cross breed cows was 24 h after the onset of oestrus.
Keywords: conception rate, service per conception, optimum time of insemination, Simmental cross
Topic: Animal reproduction