Performance Of The Simmental Ongole Crossbred Cow Estrus In To Use PGF2α and GnRH Hormone Injection

Abstract

The purpose of this study was conducted to determine the effect of the hormone PGF2α and GnRH in the onset of estrus Simmental Ongole crossbred cow. This research has been conducted in the  Jatikuwung Farm, Department of Animal Husbandry, Faculty of Agriculture, Universitas Sebelas Maret. The experiment uses design Complete randomized design (CRD) treatment was repeated 3 times using nine cows. Treatment consisted of P1= PGF2α 0.5 doses and GnRH 1.50 doses, P2 = PGF2α 1 doses and GnRH 1 doses, and P3 = PGF2α 1.5 doses and GnRH 0.5 doses.  After the first injection of hormones PGF2α all visualizations observed estrous cow once every 07.00 a day for 11 days. The second PGF2α injected simultaneously on all cows after the eleventh day of the first PGF2α injection.  Observations visualization estrous done eight times a day. Estrus detection was done by using heat detector.  GnRH injection performed on the second day after the second PGF2α injection and estrous observations made every two hours interval. Cows are showing signs of estrous directly mated with artificial. The second injection of PGF2α implemented 11 days after the first PGF2α injection and three days later injected GnRH. Both of them is done intra muscular injection. The results of this study indicate that all cattle estrus (100%), the average onset of estrus P1, P2 and P3 were 18±19.05, 21±12.49 dan 18±19.05 hours after the second injection PGF2α. Estrus detection results using a heat detector P1 = 253.33 ± 40.42, P2 = 276.67 ± 15:28, and P3 =  300.00 ± 10,00. The mean erectile uteri is P1 = 3:00 ± 0:00, P2 = 2:33 ± 1.15 and P3 = 2.66.  ± 0:57. Conclusion of the study is the difference in dose of PGF2α and GnRH response estrus appearance the same. The most economical is the use of injection PGF2α 0.5 doses and of GnRH 1.5 doses.