Effects of fraternity size on the growth of piglets, and meat production and reproduction traits of growing pigs.
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概要
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The possibility of effects of fraternity sizes on the growth of piglets, meat prodiction traits of growing pigs and reproduction traits of sows was investigated. The traits examined were the body weight from birth up to 8 weeks of age, and weight gain of 2216 Landrace line piglets, the meat production traits of 291 growing boars and 735 growing guts and the reproduction traits of 239 sows of the first down to the sixth generations Landrace line pigs. The piglets were given feed from 2 weeks of age and weaned at 5 weeks of age. The number of the successfully weaned piglets was termed as the fraternity size. The fraternity sizes were classified into 4 groups of less than 7, 8-9, 10-11 and more than 12.The differences in the body weight and the weight gain between the group of less than 7 and that of more than 12 piglets were 0.1, 0.31, 0.58, 1.08, 1.62, 2.04, and 2.64kg at birth, 1, 2, 3, 4, 5 and 8 weeks of age, respectively, and 0.47kg and 1.47kg for the body weight gain from the birth to 2 weeks of age and that from 2 to 5 weeks of age, respectively. All the differences thus noted were significant. It was found out that the larger the litter size, the poorer the growth was. However, the effect of the litter size was not significant upon the weight gain (0.54kg) from the 5 weeks down to 8 weeks of age. It was clarified that the effect of the litter size was significant upon the body weights of the growing boars and gilts at age of 8 weeks and upon the age of reaching the body weight of 30kg, but that the effect of the fraternity size was not appreciable upon the age of reaching the body weight of 90kg, daily mean weight gain, backfat thickness, daily mean feed intake, feed conversion ratio, selection index value, or numbers of farrowings by sows or number of produced piglets. These results suggest that the effects of fraternity size on the growth, meat production and reproduction traits are tapered off as age advances.
- 日本養豚学会の論文
日本養豚学会 | 論文
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