ESTRUS SYNCHRONIZATION IN WEANED SOWS WITH SELF-FEEDING AT LACTATION PERIOD AND SIMULTANEOUS WEANING
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概要
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In order to synchronize the estrus of sows, a designated formula feed with a TDN of 68% and a DCP of 11% was fed ad libitum from 7 days after parturition up until weaning so as to reduce the time since the weaning up until the first estrus.Neither reduction in the amount of feed nor fasting was attempted around the time of the weaning. Except for the lactation period, 1.4kg/day of the formula feed and 12kg/day of grained oat (with a TDN of 54% and a DCP of 6.3%) were fed to the sows on the basis of once a day.The results of the synchronization of sows were as shown in the part I of our present study. In the present part, daily feed intake and variations in body weights and growths of litters are reported.The number of the sows subjected to the synchronization study was 134 Landrace, 87 Large White, and 80 Hampshire, the total being 301. The numbers of sows in respective parity were 77, 65, 59, 46, 31, and 23, for the first (primipara) through the sixth parity, respectively.1. Weight gain occurred in many sows also during the lactation. The mean weight gains of respective parity were 3.4-5.3kg in Landrace, 8.1-11.5kg in Large White, and 15.6-18.6kg in Hampshire sows, except that all the breed sows gained their weights over 15kg in the sixty parity and that Large White sows gained weights by 3.0±12.0kg in the first parity and Hampshire sows gained weights by 8.7±13.0kg at the third parity.2. The daily feed intake during the self-feeding amouted to 6.8-7.1kg/day in the first parity, 7.6-8.1kg/day in the second parity, and 8.0-9.3kg/day after the third parity except that Hampshire sows showed a feed intake of 7.7±0.5kg/day in the sixth parity.The mean total lactation period was 6.4-6.6kg/day in the first parity, 7.0-7.3kg/day in the second parity, and 7.2-8.5kg/day after the third parity. Although there were some veriations in the feed intake with the breeds and parity, these amounts were about 2kg more than that of the Japanese Feeding Standards for Swine (1975)3. The total body weight of litters at age of 5 weeks in the third parity of Large White was the highest, amounting to 81.7±14.8kg, while that of Hampshire in the first parity was 46.3±13.2kg, which was the minimum. In any parity, the results of the litter's weights were in the decreasing order of Landrace, Large White, and Hampshire.4. Correlation and partial regression coefficients were evaluated among the weight gains of sows during the lactation period (X), the daily feed intake during the incessant slef-feeding (Y) and the total body weights of litters at age of 5 weeks (Z).Positive correlation was noted between X and Y. Significance was seen in rXY in any parity except for the sixth parity and in rXYZ in any parity.X was negatively correlated to Z. Significance was noted in rXZ in any parity except for the sixth parity, and in rXZY in any parity.Y was positively correlated to Z. Significance was noted in rYZ in the 1st, 3rd, 4th, and 6th parities and in rYZX in any parity.The multiple regression equation (Y)=a1+a2X+a3(Z) were evaluated for each parity. The equations of any parity were similar to each other and significance was noted in all parities at 1% level.
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