Effect of the administration of eCG and GnRH-analogue on the reproductive performance of primiparous sows weaned under high caloric load conditions
Keywords:
eCG, GnRH, reproductive performance, heat stress, giltsAbstract
With the objective of determining the effect of the application of eCG and GnRH-analogue on the reproductive performance of primiparous sows that were lactating under conditions of high environmental caloric load, a study was carried out during the months of June to October. The average ambient temperature during the study period was 30.9 °C and a relative humidity of 74.6 % (ITH of 83.4 points). One hundred primiparous sows were used, which were assigned one of two treatments (T): T1 (Control group; n = 50); sows that did not receive post-weaning and T2 hormonal treatment (eCG + GnRH; n = 50); sows that received i.m. of 1000 IU of eCG 24 h post-weaning and 50 µg of GnRH at the time of the onset of heat. Sows that received the application of 1000 IU of eCG had a shorter (p<0.05) weaning-to-estrus interval (129.41 vs. 218.54 h); However, the farrowing rate was lower (p<0.05) in the sows that received the combined treatment of 1000 IU of eCG 24 h post-weaning and 50 µg of GnRH at the time of estrus (66.66 vs. 81.25%). The size and weight of the litter was not modified (p>0.05) by the treatment. The results obtained allow us to conclude that the i.m. application of 1000 IU eCG 24 h post-weaning, to gilts weaned under conditions of high caloric load, decreases the weaning-to-estrus interval, but the combined administration of 1000 IU of eCG 24 h post-weaning and 50 µg of GnRH at the time of the manifestation of estrus decreases farrowing rate in metabolically compromised primiparous sows under conditions of high environmental caloric load.
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