Assessment of estrous synchronization protocols and pregnancy specific protein B concentration for the prediction of kidding rate in Lezhi black goats
SMALL RUMINANT RESEARCH(2021)
Abstract
The objectives of this study were to assess the efficacy of estrous manipulation protocols and pregnancy specific protein B (PSPB) levels to determine kid number at birth in Lezhi black goats. Eighty-eight does were randomly allocated to three treatments. The PPe group (n = 29) was treated with Controlled Internal Drug Release devices (CIDR) for 7 days and 300 IU eCG and 0.2 mg PGF(2 alpha) at the time of CIDR removal. The PPG group (n = 28) was treated with a CIDR for 7 days and 0.2 mg PGF(2 alpha) at the time of CIDR removal and 15 mu g GnRH at the onset of estrus. The GPG group (n = 31) was treated with 15 mu g GnRH (day 0) and 0.2 mg PGF(2 alpha) on day 7, and a second GnRH treatment at the onset of estrus. Does at estrus were hand-mated using proven bucks. Estrous response ranged from 80.6%-89.7 %. The onset of estrus for the PPe, PPG and GPG groups was 38.4 +/- 1.9, 45.6 +/- 1.9 and 53.8 +/- 1.4 h (P < 0.05), respectively. Mean kidding rates (205.9 %-227.8 %) and kidding percentages (112.9 %-146.4 %) were not different in the three treatments. At day 85 of gestation, does carrying quadruplets had a greater (P < 0.01) plasma PSPB level than does that delivered one to three kids. In conclusion, PPG may be a useful estrous synchronization protocol in goats. PSPB concentration at day 85 of gestation could be a potential diagnostic tool for predicting quadruplets.
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Key words
Goat,Estrous synchronization,Kidding rate,Pregnancy specific protein B
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