Effect of hCG and intravaginal application of estradiol and prostaglandin E2 on pregnancy rate and litter size in gilts and sows
Journal Title: Animal Science Papers and Reports - Year 2014, Vol 32, Issue 1
Abstract
Three separate experiments were performed on fifty pregnant gilts (Experiment 1 and 2) and forty primiparous sows (Experiment 3) to examine the effect of human chorionic gonadotropin (hCG) administration on day 12 (Experiments 1 and 2) or 20 (Experiments 2 and 3) of pregnancy and intravaginal application of estradiol alone or estradiol + prostaglandin E2 (PGE2) on days 17-23 (Experiment 3) of pregnancy on pregnancy rate and litter size and weight at birth and weaning. None of the treatments affected the pregnancy rate which ranged between 90 and 80% in control and treated groups. In Experiment 1 no differences in the number of piglets born (13.2±1.1 or 13.0±0.8) and weaned between control and hCG group were noticed. In Experiment 2 hCG treatment increased the total number of piglets born. For treatment on day 12 this number amounted to 15.1±1.3, for day 20 – 16.4±1.4, while for control gilts 13.0±1.5. The similar trend occurred in the number of piglets born alive. The remaining indicators of piglets survival did not vary between groups. Though there were no significant differences in the number of total piglets born between groups of sows in Experiment 3, a trend to the increased number of piglets weaned was found in groups with intravaginal treatment of estradiol and PGE2 (P= 0.10 ) or hCG administered on day 20 of pregnancy. The study revealed, for the first time, that hCG or intravaginal estradiol and PGE2 administration during early pregnancy did not affect the pregnancy rate in gilts and sows and can be beneficial for litter size.
Authors and Affiliations
Adam Zięcik, Marcelina Lopińska, Emilia Przygrodzka, Marta Wasielak, Wojciech Kempa
Keywords
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