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Effects of ad libitum and rationed feeding of sows during several consecutive parities on the productivity 2nd communication Reproductive and rearing performance



Effects of ad libitum and rationed feeding of sows during several consecutive parities on the productivity 2nd communication Reproductive and rearing performance



Zuechtungskunde 75(1): 42-52



In an investigation with 526 pregnant sows with rationed or ad libitum feeding, the rationed fed sows had better results in the reproductive performance than the sows fed ad libitum. The difference between both variants grew with increasing parity. In the 5th parity there was a difference of 2.75 alive born piglets between rationed and ad libitum fed sows. The number of stillborn piglets showed the same tendency for the restrictive fed sows. Up to the 5th parity, the rationed fed sows reached 0.1 less stillborn piglets than the ad libitum fed sows. The frequency of mummified piglets per litter in rationed or ad libitum fed sows was balanced during the first three parities. There were between 0.25 and 0.33 mummified piglets per litter. The largest difference was at the 5th parity: the ad libitum fed sows had 0.4 mummies and the rationed fed sows 0.3 mummies per litter. More piglets were lost in the ad libitum fed groups compared to the rationed fed sows. The average birth weight of each piglet from ad libitum fed sows was higher than those of rationed fed sows, but the total litter weight at birth was higher from the rationed fed sows. This was due to the fact that more piglets were born by rationed fed sows. The litter weight at weaning from rationed fed gilts was on average of 4.0 kg higher (64.7 kg) than the litter weight from the ad libitum fed gilts. The sows of both feeding systems showed the same litter weights at weaning. The results show that the ad libitum feeding of sows during gestation with increasing age of the sows has negative effects on reproductive and rearing performance.

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