We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
EFFECT OF CIDR WITH OR WITHOUT GnRH AND DOUBLE PGF<sub>2α</sub> BASED ESTRUS SYNCHRONIZATION PROTOCOLS ON ESTRUS RESPONSE AND PREGNANCY PER AI IN NON-DESCRIPT COWS OF THE PUNJAB.
- Authors
Haider, M. S.; Bilal, M.; Ahmed, H.; Anwar, M.; Sattar, A.; Andrabi, S. M. H.
- Abstract
Two experiments were conducted to analyze the effect of controlled internal drug release device (CIDR) containing 1.38 g progesterone (P4) with or without gonadotropin releasing hormone (GnRH) and double prostaglandin (PGF[sub 2α]) on estrus response and pregnancy per AI in non-descript cows. In exp 1, cows in 2[sup nd] to 3[sup rd] lactation (n=80) were randomly divided into two groups as CIDR alone (n=40; CIDR inserted on D0, PGF[sub 2α] analogue administered on D6 and CIDR removed on D7) and CIDR along with GnRH (n=40; GnRH analogue administered at D0 and rest of the scheme was same as in CIDR alone) during the low breeding season. Whereas, in exp 2, cows in 2[sup nd] to 4th lactation (n=67) were distributed into two groups as CIDR (n=33; CIDR inserted on D0, PGF[sub 2α] analogue administered on D6 and CIDR removed on D7) and double PGF[sub 2α] group (n=34; PGF[sub 2α] analogue administered twice with 14 days interval) during the peak breeding season. Artificial inseminations (AI) were performed at 58 h after CIDR removal in all CIDR treated cows and upon detected estrus in the double PGF[sub 2α] group of exp 2. Pregnancy was diagnosed at 50 days post AI through rectal palpation. Estrus response did not differ significantly in both groups of exp 1(82.5 vs. 90%) and exp 2 (76 vs. 76%), however, estrus intensity differed (P=0.01; 3.02 ± 0.10 vs. 3.32 ± 0.12) between groups of exp 1. The pregnancy per AI did not differ (P>0.05) between CIDR alone (52%) and CIDR along with GnRH (58%) treated cows of exp 1; whereas, it tended to be higher (P=0.19) in CIDR treated cows (64%) as compared to double PGF[sub 2α] (46%) of exp 2. It is concluded that CIDR-based estrus synchronization protocol improves the reproductive efficiency of nondescript cows during the low and peak breeding seasons.
- Subjects
CATTLE reproduction; ESTRUS synchronization; COWS; ARTIFICIAL insemination of cattle; COW testing; ANIMAL genome mapping; REPRODUCTION
- Publication
JAPS: Journal of Animal & Plant Sciences, 2017, Vol 27, Issue 4, p1108
- ISSN
1018-7081
- Publication type
Article