1. Evaluation of out-of-season estrus induction protocols in progesterone-primed mix-breed dairy goats using eCG, GnRH and E2.
- Author
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Carrillo, Evaristo, Meza-Herrera, César A., Luna-Orozco, Juan R., Delgado-Gonzales, Ramón A., Gaytan Aleman, Leticia R., Ángel-Garcia, Oscar, Véliz, Francisco G., and Contreras-Villarreal, Viridiana
- Subjects
GOATS ,ESTRUS ,ELECTROCARDIOGRAPHY ,INDUCED ovulation ,OVULATION ,PROGESTERONE - Abstract
Different out-of-season estrus induction protocols were evaluated using a single progesterone (P4) priming 24h prior the use of eCG, GnRH or E2. Adult anestrus mix-breed dairy goats (n=32) were P4-primed (20 mg i.m.) and randomly assigned (n=8) to: a). E2: 1mg i.m. estradiol+0.2ml cloprostenol 24h later, b). E2+GnRH: E2+2.5ml GnRH 24h later, c). E2+eCG, E2+100 IU i.m. eCG 24h later, and d). eCG, 250IU i.m. eCG . Response variables considered the percentages of estrus (ES%, detected by sexually active males), ovulation (OV%), and pregnancy (PR%, diagnosed 45d after estrus detection). All treatments achieved high ES% (>87%) and OV% (>50%), yet, E2+GnRH reached 88% of OV% and PR%. E2 alone had the lowest PR% (p<0.05; 12.5%) and the highest interval from estrus to ovulation. The largest PR% (p<0.05; 81.5%, average) were observed in E2+GnRH and E2+eCG. Results indicate the feasibility of a simple synchronization protocol based in a single i.m. progesterone-priming plus E2+GnRH. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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