Comparative Evaluation of Control Internal Drug Release (CIDR) Implants and Double Dose PG Protocol on Conception Rate in Repeat Breeding Buffaloes under Field Conditions
Mahesh Kadagi *
ICAR-Krishi Vigyan Kendra, Haveri, UAS Dharwad, Karnataka, India.
Chethan Sharma G
Department of Veterinary Gynaecology and Obstetrics, Veterinary College Shivamogga, India.
Mahesh C
Department of Animal Science, College of Agriculture, Kalaburagi, India.
Pavan Belakeri
Department of Animal Husbandry and Veterinary Services, Haveri, India.
*Author to whom correspondence should be addressed.
Abstract
The aim of the study was to compare the efficacy of double dose PG protocol and CIDR implants in combination with different hormones for treatment of repeat breeding buffaloes. 45 repeat breeding buffaloes were selected randomly from field and divided into three groups. Group-I (n=15) animals inseminated during normal estrus cycle without any hormonal therapy and kept as control. Group-II (n=15) treated with two doses of 500 μg of PGF2α injection at 11d interval and at the time of artificial insemination treated with 0.02mg GnRH injection. Group-III (n=15) treated with an intra vaginal P4 device (CIDR implant) for 7 days and PGF2α was given intramuscularly 24 hrs prior to CIDR removal, after 48 to 72hrs AI done with GnRH inj. Per-rectal pregnancy diagnosis was performed 60th day post AI. The conception rate was significantly (p<0.05) higher in Group II (60 %) and Group III buffaloes (66.67 %) when compared with Group I buffaloes (26.67 %). 66.67 % of buffaloes treated with CIDR implants and 73.33 % of buffaloes treated double dose PGF2α have shown the estrus duration upto 18-24h. Results indicate both protocols certainly bring the buffaloes under normal estrus and also increase in the conception rate.
Keywords: Pregnancy diagnosis, estrus, repeat breeding, CIDR implants, PG protocol, GnRH, conception rate