Effective management of piglet production by lowering the 1st insemination age or increasing 1st farrowing results following the biotechnical induction of puberty
Nowak, P.; Schlegel, W.; Hühn, U.
Archiv für Experimentelle Veterinarmedizin 36(1): 109-114
1982
ISSN/ISBN: 0003-9055 PMID: 7092470 Document Number: 192966
At 3 experimental farms, gilts aged 6-7 months were treated for induction of puberty with 500 IU PMSG + 250 IU HCG. Ten days later, the females were treated for 12 days with 5 g daily of Suisynchron-premix, and were given timed inseminations. At the 3 farms, experimental females averaged 235, 231 and 235 days of age at insemination vs. 274, 286 and 305 days for controls subjected to oestrus synchronisation only. The number of liveborn piglets per 100 first inseminations averaged 663, 418 and 417 vs. 682, 436 and 609. At 1 farm, age at 3rd farrowing in experimental females averaged 544 days vs. 587 for controls, and the number of piglets per 100 first inseminations 938 vs. 901. In another experiment, involving 9 farms, 7881 gilts treated for induction of puberty were compared with 7736 untreated controls. The CR was 71.7 and 70.1% resp., litter size 9.5 and 9.0 (P<0.05), number of liveborn piglets per litter 8.8 and 8.4 (P<0.05), and number of liveborn piglets per 100 first inseminations 631 vs. 589 (P<0.05). Age at induction of puberty had a significant effect on CR, which was highest (84.6%) for females treated at 191-195 days. These females also had the highest number of liveborn piglets per 100 first inseminations (745). The optimum interval between puberty induction and oestrus synchronisation was 64-70 days.