Influence of certain reproduction performance measures on the farrowing period and effects of the farrowing period on stillbirth risk, and piglet one-week weight and raising rate
2005
Imaeda, N. (Gifu-ken. Livestock Research Inst., Kiyomi (Japan)) | Yoshioka, G. | Torimoto, Y.
Using 154 Large White sows that farrowed a litter of 8 or more piglets, we investigated the influences of litter size, farrow month, parity and gestation period on the time taken for a litter of all piglets to be born (designated as farrowing period). Also, the relations of the farrowing period to the rate of stillbirth, one-week weight and raising rate in piglets were studied. Litter size made the farrowing period longer with a positive correlation (r=0.19, P<0.05), but farrow month, parity and gestation period did not influence the farrowing period. The rate of stillbirth increased significantly (P<0.05) when the farrowing period exceeded 4 hours. A significant difference in one-week weight of piglets was found in different farrowing periods (P<0.05), although there was no correlation between the farrowing period and the one-week weight. No significant relation existed between the raising rate and farrowing period. In this study, it was shown that farrowing period was affected by the litter size. Furthermore, the present finding that prolongation of the farrowing period resulted in the increase of stillbirth rate suggests that its shortening within 4 hours can be a positive step to reduce stillbirth rate.
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