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Hormone supplementation to increase fertility after uterine artificial insemination in ewes.
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1986
Year
Unknown Venue
FertilityReproductive HealthGynecologyReproductive BiologyCidr DevicesUterine Artificial InseminationReproductive PhysiologyReproductive EndocrinologyPublic HealthInfertilityEndocrinologyAnimal ReproductionTheriogenologyAnimal ScienceCidr RemovalSecond CidrMedicineAnimal BreedingReproductive Hormone
A flock of 283 Merino ewes, had oestrus synchronized with CIDR devices containing 9% progesterone. At CIDR removal the ewes were divided into four groups. Group 1 had a 2nd CIDR inserted during days 10 to 16 after removal of the first CIDR. Group 2 received 400 iu of PMSG at CIDR removal. Group 3 received both PMSG and a second CIDR. Group 4 had no hormone treatment and served as controls. All ewes underwent intrauterine A.I. at SO-56 h after CIDR removal. PMSG increased the proportion of ewes showing oestrus 36 h after CIDR removal. Exogenous progesterone given during days 10 to 16 increased number of foetuses per ewe joined and number of foetuses per ewe pregnant from 57% and 105% in controls to 83% and 125% respectively. Combined treatment with PMSG and progesterone increased the number of foetuses per ewe pregnant to 128%. The results suggest that progesterone, if given over days lo-16 of pregnancy, can cause a reduction in embryo mortality.