Estrus Response and Conception Rate in Sangamneri and Osmanabadi Goat Does using different Estrus Synchronization Protocols

Abstract

Total 104 parous goats of Sangamneri (62) and Osmanabadi (42) breeds aged 2 - 4 years were used in this study. All goats were randomly distributed in six treatment groups. Group wise applications of hormones used for the estrus synchronization and controlled breeding protocols including both breeds of goat were as under: Group I- Two dosages of Inj. PGF₂α; Group II -Intra-vaginal sponges + Inj. eCG i.m. on the day of sponge removal; Group III -Intra-vaginal sponges + Inj. PGF₂α i.m. 24 h prior to sponge removal + Inj. eCG i.m. on the day of sponge removal; Group IV- Intra-vaginal sponges +  Inj. GnRH  i.m. 24 h prior to sponge removal; Group V -Intra vaginal sponges + Inj. GnRH (i.m.) on the day of sponge removal; Group VI Intra-vaginal sponges + Inj. eCG (i.m.) 24 h before sponge removal. The percentage of goats exhibiting estrus from sponge withdrawal or from the end of treatment for treatment Groups I, II, III, IV and V in Sangamneri goats were 66. 67, 100, 100, 100, 91.67 % and in Osmanabadi goats as 69.23, 100, 100, 100, 57.14 %, respectively. One Sangamneri goat in Group IV exhibited estrus for seven days after sponge removal. Estrus response was 100 % for both Sangamneri and Osmanabadi breeds of goats subjected to estrus synchronization belonging to treatment Groups II, III and IV. The overall percentage of goats exhibiting estrus following different synchronization protocols were 89.28 % and 83.33 %, in Sangamneri and Osmanabadi goats, respectively. The mean time of onset of estrus (h) from progestagen withdrawal  for  five different  treatment groups in Sangamneri goats were 25.20 ± 5.50, 46.91 ± 2.53, 27.33 ± 2.26, 41.33 ± 3.53, and 48.55 ± 4.16 h, respectively and in Osmanabadi goats as 44.4 ± 3.36, 24.0 ± 6.28, 26.75 ± 4.12, 46.84 ± 3.88, and 48.0 ± 9.09 h, respectively. The overall mean interval of onset of estrus in Sangamneri and Osmanabadi goats were 37.20 ± 2.31 h and 37.08 ± 5.72 h, respectively. The mean estrus duration (h) for five different treatment groups following estrus synchronization in Sangamneri goats were 54.60 ± 4.60, 76.36 ± 7.81, 56.67 ± 5.92, 44.00 ± 7.48, and 69.27 ± 8.76 h, respectively and for Osmanabadi goats as 44.00 ± 3.46, 113.14 ± 6.65, 53.50 ± 6.63, 50.86 ± 6.69, and 51.0 ± 15.78 h, respectively. The overall mean duration of estrus in Sangamneri and Osmanabadi goats were recorded as 61.08 ± 3.51 h and 62.34 ± 5.38 h, respectively. There was variation in estrus interval among different treatment groups of both the breeds. The conception rates in Sangamneri goats were 40.00, 72.73, 66.67, 88.89, and 72.72 %, respectively and in Osmanabadi goats in five treatment groups as 44.44, 57.14, 37.50, 71.43, 100.00 %, respectively. The overall pregnancy rate in Sangamneri goats in this study was 68.00 %, whereas for Osmanabadi goats it was 57.14 %. Out of 34 pregnant Sangamneri goats, 21 goats’ kidded and 32 kids were delivered. In Osmanabadi goats 10 goats kidded out of 20 pregnant goats delivering 12 kids. The percentage of single kids, twins and triplet kids born in Sangamneri goats were 34.37, 21.87 and 3.12 percent, respectively whereas, Osmanabadi goats delivered 66.67 % single kids and 16.17 % twins. Overall kidding rate in Sangamneri and Osmanabadi breeds of goats was 63.64 % and 71.43 %, respectively. Multiple kidding rate observed in Sangamneri and Osmanabadi breeds was 47.62 % and 20.00 %, respectively. Overall litter size in Sangamneri and Osmanabadi breeds was found to be 1.52 and 1.20, respectively.