Effects of differences in feed supply to pregnant sows upon the long-term reproduction results of swine
1989
Mori, T. (National Inst. of Animal Industry, Kukizaki, Ibaraki (Japan)) | Nagano, R. | Furuya, S.
The present study was conducted to assess how much the feed supply and the energy demand should be for long-term reproduction and yet with shortened and efficient cycles of reproduction of sows, with special emphasis upon conception rate, conditions of reproductive tissues, developments of offsprings and sows themselves and their longevity. Sixteen Landrace gilts divided into two groups were used for the present study. The control group was fed daily 2.0 kg of feed per head during each term of pregnancy of the first through the fourth parities, while the test group was fed daily 1.7 kg of the same feed per head for the first parity, 1.8 kg of the same feed per head for the second and 1.9 kg and 2.0 kg of the same feed per head for the third and the fourth, respectively. In the winter season (from Dec. to Mar.), the daily feed supply was increased by 0.4 kg for both groups. During the lactation period, daily feed supply for pregnancy period plus 0.45 kg per head of sucklings per day were provided. The litters were weaned at 28 days of age, and creep feed was provided and libitum since 14 days of age. From weaning to mating, both groups were fed 2.0 kg of feed per day. The feed provided for the pregnancy and lactation periods was mainly composed of corn, barley and soybean cake, containing 14% of crude protein (CP) and 3200 kcal/kg of digestible energy (DE). In the first parity of the control group, the weight gains during the pregnancy period (the difference obtained by subtracting the weight at mating from that soon after parturition) and since mating to weaning were more than 25 kg and 15 kg, both of which are deemed adequate amounts, respectively, and the energy supply of 6400 DE kcal was therefore found to be sufficient
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