Volume 3, Issue 1, January 2015, Page: 12-17
Effects of Gonadotropin Releasing Hormone Analogue in Enhancements of Pregnancy in Repeat Breeding Dairy Cows in and around Mekelle, Tigray, Ethiopia
Birhanu Hailu, Samara University, College of Veterinary Medicine, P.O.Box.132, Samara, Ethiopia
Berihu Gebrekidan, Mekelle University, College of Veterinary Medicine, Mekelle, Ethiopia
Solmon Raju, Mekelle University, College of Veterinary Medicine, Mekelle, Ethiopia
Alemselam Birhanu, Mekelle University, College of Veterinary Medicine, Mekelle, Ethiopia
Gebrhiwot Tadesse, Mekelle University, College of Veterinary Medicine, Mekelle, Ethiopia
Received: Dec. 29, 2014;       Accepted: Jan. 12, 2015;       Published: Jan. 27, 2015
DOI: 10.11648/j.avs.20150301.13      View  2893      Downloads  141
Abstract
Clinical trial was carried out to evaluating the effects of GNRH analogue (buserelin acetate) along with AI in repeat breeding cross breed cows on enhancement of pregnancy. The trial was also aimed at evaluation of dose variation on conception rate. Sixty six cross breed dairy cattle which were apparently healthy, exhibits estrus regularly were selected and assigned randomly in to three equal groups(A,B and C); two treated groups and one control group. Group A (n=22) cattle were injected intramuscularly a 20 µg buserelin acetateat along with AI and Group B (n=22) cattle have injected with dose of 10µg Buserelin acetate. Group C (n=22) cattle were receive no treatment and considered as a control group, given a single service. These cows were examined for pregnancy after three months through rectal palpation. Additional history was taken from herd owners. The pregnancy rates recorded were 68%, 59% and 32% in the cattle grouped with A, B and C respectively. The conception rates of the treated groups exceeds control group by 36% and 27% respectively. Treated groups showed a significant statistical variation (P<0.05) as compared to control group. Dose variation between two treated groups has an effect on pregnancy rate with significant variation. Other observed finding was that treated first and second parity cows became more responsive to therapy than those with more than two parity with a significant variation (P<0.05). The study revealed that the use of GNRH analogue therapy at the time of AI can enhance pregnancy rate. This would be helpful and cost effective to minimize financial losses incurred from milk production loss, managmental and feed cost. This might be achieved through reducing calving interval and treating repeat breeding cases. The benefit cost ratio indicates that individual cow could benefit small holder farmer by 140 USD within a single month.
Keywords
Crossbred Cattle, Estrus, Repeat Breeding GNRH Analogue, Pregnancy Rates
To cite this article
Birhanu Hailu, Berihu Gebrekidan, Solmon Raju, Alemselam Birhanu, Gebrhiwot Tadesse, Effects of Gonadotropin Releasing Hormone Analogue in Enhancements of Pregnancy in Repeat Breeding Dairy Cows in and around Mekelle, Tigray, Ethiopia, Animal and Veterinary Sciences. Vol. 3, No. 1, 2015, pp. 12-17. doi: 10.11648/j.avs.20150301.13
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