Fertility Improvement by Ovsynch Protocol in Repeat Breeder Cattle of Kathmandu Valley

  • Bikalpa Karki Agriculture and Forestry University, Rampur, Chitwan
  • Rabin Raut Agriculture and Forestry University, Rampur, Chitwan
  • Krishna Prasad Sankhi Himalayan College of Agricultural Sciences and Technology (HICAST), Kathmandu
  • Umesh Mandal Himalayan College of Agricultural Sciences and Technology (HICAST), Kathmandu
  • Gokarna Gautam Agriculture and Forestry University, Rampur, Chitwan
Keywords: Repeat breeders, Ovsynch protocol, GnRH, PGF2α, Biopryn test, Fixed time AI

Abstract

Repeat breeders cause substantial loss in dairy herds mainly affecting the reproductive efficiency and economy of milk production in cattle and buffaloes. A study was conducted in cattle farms of various farmers of three districts of Central Region of Nepal; Kathmandu, Bhaktapur and Lalitpur during March-August 2016. A total of 20 repeat breeder cows were selected for the trial. Repeat breeder cows were identified based on the history of at least three repeated breeding at an interval of around three weeks. We applied Ovsynch protocol where two reproductive hormones; Gonadotropin Releasing Hormone (GnRH) and Prostaglandin (PGF2α) were injected. Pregnancy was initially diagnosed by Biopryn Test kit using serum samples. Rectal examination confirmed pregnancy after 2 months of artificial insemination (AI). 16 cows expressed clear estrus signs during fixed time AI. 5 (83.3%) out of 6 cows with cystic ovary expressed estrus at the time of fixed time AI. 4 (66.7%) of these cows became pregnant.

Int. J. Appl. Sci. Biotechnol. Vol 6(3): 261-264

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Abstract
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PDF
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Published
2018-10-01
How to Cite
Karki, B., Raut, R., Sankhi, K. P., Mandal, U., & Gautam, G. (2018). Fertility Improvement by Ovsynch Protocol in Repeat Breeder Cattle of Kathmandu Valley. International Journal of Applied Sciences and Biotechnology, 6(3), 261-264. https://doi.org/10.3126/ijasbt.v6i3.21183
Section
Research Articles