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The effect of the weaning to oestrus interval on litter size, live born piglets and farrowing rate in sows



The effect of the weaning to oestrus interval on litter size, live born piglets and farrowing rate in sows



Journal of Animal Physiology & Animal Nutrition 71(1): 30-38



During a five year period, data were collected on a 390 sow pig unit. This unit consisted of three 130 sow subunits which only differed in housing system during gestation. The data were used to analyse the effects of the weaning to oestrus interval (WOI) on litter size, number of live born piglets and farrowing rate. Litter size (total born) was gradually decreasing from 1.9, at a WOI of four days, to 11.1, at a WOI of eight days (P lt 0.06). When the WOI was longer than twelve days the litter size increased. When the WOI was longer than eighteen days, an insemination resulted in a total of 13.5 piglets, which is significantly more (P lt 0.01) than at a WOI of five days. The number of piglets born alive after insemination of sows with a WOI of six days was lower than that of sows with a WOI of five days (10.39 versus 10.73; P lt 0.05). Sows with a WOI of more than eighteen days, produced 1.8 liveborn piglets per litter more than sows with a WOI of five days (P lt 0.01). Concerning the farrowing rate it is concluded that first parity sows have low farrowing rates when bred during the first week after weaning compared to higher parity sows; at a WOI of four and six days the results were worst, 74.1 and 76.1 % (P lt 0.05), and a WOI of five days gave the optimal situation (85.8 %). Higher parity sows showed the best farrowing rate at a WOI of four days (93.5 %). Farrowing rates of first and higher parity sows with a WOI of nine to twelve days were very low (66.7 and 58.6%, P lt 0.01 and P lt 0.001 respectively).

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Accession: 002518381

Download citation: RISBibTeXText

DOI: 10.1111/j.1439-0396.1994.tb00336.x


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