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

Bikalpa Karki,Gokarna Gautam,Krishna Prasad Sankhi,Rabin Raut,Umesh Mandal

doi:10.3126/ijasbt.v6i3.21183

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

Highlights

Repeat breeding is the most frequently encountered but poorly understood condition affecting the reproductive efficiency and economy of milk production in cattle and buffaloes
All four cows not detected in estrus at the time of fixed time artificial insemination (AI) were negative for BioPRYN test
Transrectal palpation at 60 days after fixed time AI confirmed that all 11 cows positive for BioPRYN test were pregnant, and all negative for BioPRYN test were nonpregnant

Summary

Introduction

Repeat breeding is the most frequently encountered but poorly understood condition affecting the reproductive efficiency and economy of milk production in cattle and buffaloes. Reproductive inefficiency of cattle due to repeat breeding syndrome is an expensive hitch in profitable dairy production as the age at first calving in heifers is delayed and the inter-calving interval is extended, leading to lowering of calf crop (Thakur et al, 2006). This syndrome can be one of the more frustrating problems affecting reproductive management of a dairy herd. The ultimate result is tremendous loss due to loss of milk yield as the daily milk yield of local cattle is 2.5 liters per cow, whereas that of improved cattle is 7.64 liters per cow (Sapkota, 1999).

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