Comparative efficacy of the synchrony programmes in subestrus crossbred cows at smallholder farms in Bangladesh

摘要: The objective was to compare the reproductive efficacy of a Cosynch (GnRH-PGF2α− GnRH + TAI), PG programme (one shot PGF2α ) with artificial insemination (AI) on observed estrus and untreated control (AI estrus) in subestrus (cycling but not detected by ≥60 days postpartum) crossbred cows at smallholder farms. Ultrasonographic examinations were performed AI, 7 d after AI 28 42 determine largest follicle, new corpus luteum (CL) diagnose conception pregnancy, respectively. Of 69 enrollments detection groups, 78.9% 54.8% during following two weeks (χ2=4.57; P=0.04). inseminated all 75.7% Cosynch, 76.7% 82.4% ovulated (χ2=0.31; P=0.86). size follicle had positive correlation resultant CL (r=0.84, P=0.001). that subsequently became pregnant was...