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Animal Science Papers and Reports

Effect of hCG and intravaginal application of estradiol and prostaglandin E 2 on pregnancy rate and litter size in gilts and sows

Adam J. Ziecik
Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Tuwima 10, 10-748 Olsztyn, Poland
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 E
2
(PGE
2
) 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 PGE
2
(P= 0.10 ) or hCG administered on day 20 of
pregnancy. The study revealed, for the first time, that hCG or intravaginal estradiol and PGE
2
administration during early pregnancy did not affect the pregnancy rate in gilts and sows and can
be beneficial for litter size
Keywords :
estradiol / hCG / litter size / PGE 2 / pig / pregnancy

Date Deposited : 02 Apr 2015 10:28

Last Modified : 02 Apr 2015 10:28

Official URL: http://www.ighz.edu.pl/?p0=5&p1=34

Volume 32, Number 1, - 2014

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