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Effects of full feeding and restricted feeding on the reproductive performances in the gilts and the sows

Effects of full feeding and restricted feeding on the reproductive performances in the gilts and the sows

Japanese Journal of Swine Science 34(2): 32-40

The present study was conducted to examine the effects of ad libitum feeding and restricted feeding on the reproductive performances in the gilts and the sows. In experiment 1, thirty one F1 female pigs (twenty seven LH gilts from six different litters and four LW gilts from one litter) were randomly assigned to three groups; ad libitum feeding group (n = 10), ordinary feeding group (n = 10) and restricted feeding group (n = 11). They were used from 4 months of age with about 50 kg of body weight to the age of puberty. The developing gilts in ordinary feeding group were fed, on, the basis of the Japanese Feeding Standard for Swine until 120 kg of body weight. Restricted feeding group was fed 70% of the feed of ordinary feeding group. Ad libitum feeding group was fed with ad libitum. Ages of puberty with 120 kg of body weight and first estrus were 206.5 +- 21.0, 223.2 +- 16.5, 302.1 +- 43.4 days and 248.3 +- 18.8, 262.2 +- 25.6, 297.1 +- 37.7 days in ad libitum feeding group, ordinary feeding group, restricted feeding group, respectively. The differences between ad libitum feeding group, ordinary feeding group and restricted feeding group were statistically significant. In experiment 2, five pigs in ad libitum feeding group, six pigs in ordinary feeding group and eight pigs in restricted feeding group were examined on the reproductive performances from first parity to tenth parity. Ordinary feeding group was fed 2.8 kg/day of gestation mash (TDN 67.0%, DCP 9.5%) during the gestation period in each parity. Restricted feeding group was fed 70% of the feed of ordinary feeding group and ad libitum feeding group was fed with ad libitum. During the lactation period, all pigs were given 5.4 kg/day of finishing mash (TDN 70.0%, DCP 12.5%). None of the sows in ad libitum feeding group were culled; all of them farrowed until tenth parity without any severe disorders. In ordinary feeding group, three sows were removed from the experiment; one died from a difficult delivery at the first parity and the others were culled because of a difficulty of standing after the fifth parity and a repeated anestrus after sixth parity, respectively. In restricted feeding group, the 6 sows that had abortion or premature delivery were culled; 2 sows in the second parity, 2 in the third parity, 1 in the fourth parity and 1 in the fifth parity. Also one sow in anestrus after weaning after third parity was culled and the other was removed in the halfway of sixth parity because of emaciation. On the basis of the above results, it is suggested that the emaciation by restricted feeding postpone the attainment of puberty and affect the breeding longevity of sows. It is also suggested that ad libitum feeding does not affect the breeding longevity of sows.

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