Year: 2020 | Month: August | Volume 10 | Issue 4

Comparison of Calving and Conception Rate after Timed Artificial Insemination (AI) with Estrus Synchronization Protocols in Crossbred Cows under Field Conditions

Chhavi Gupta R. Ramprabhu
DOI:10.30954/2277-940X.04.2020.7

Abstract:

This study was performed in 48 cross bred cows to evaluate the comparative efficacy of different estrus synchronization protocols with fixed time artificial insemination. Animals were allocated into four groups i.e. Group I: (n=12, Two Injection Prostaglandin system) Cloprostenol Sodium 500 μgm on day 0 and day 14 and AI was done 48 and 72 hours from second dose. Group II: (n=12, Heat-synch) day 0 Buserelin acetate 20 μgm, day 7 Cloprostenol sodium 500 μgm, on Day 8, Estradiol benzoate (1 ml) and AI on day 10. Group III: (n=12, Ov-Synch) day 0 Bruserelin acetate 20 μgm, day 7 Cloprostenol sodium 500 μgm, Day 9 Buserelin acetate 20 μgm and A.I. on day 10. Group IV: (n=12, Ov-Synch plus Indigenous progesterone sponge) on day 0 Buserelin acetate 20 μgm along with insertion of progesterone sponge with 1.20 gm natural progesterone, day 7 Cloprostenol sodium 500 μgm and removal of progesterone sponge, day 9, Buserelin acetate 20 μgm and AI on day 10. Inj. Buserelin acetate 20 μgm was administered on day 6th from AI in Group II, III and IV. Pregnancy was detected per rectally on day 40 after AI. In present study, estrus ratio was higher in Group II (91.66%) followed by group IV and Group III. Conception rate was significantly higher in Group III (100%). The calving percentage was significantly lower in group I and highest in Group III (100%), the difference in conception and calving rate suggests the minimum embryonic losses in Group I, but no embryonic loss was recorded in Group III, IV and II.

• PDF Download

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited