모돈 농장의 규모별 번식능력 분석

Abstract

This survey was conducted to investigate the reproductive performances. The results obtained were as follows; 1. The average of farrowing rate was 78.77%. The significant difference was not found in farrowing rate and litter sizes according to sow farm sizes. Total litter sizes averaged 11.11. 2. Litter sizes at first sucking averaged 10.32, which were more piglets in small sizes groups than in other groups (p<0.05). The average litter sizes at weaning were 10.32 The significant difference of litter sizes at weaning was not shown according to sow farm sizes. 3. The average of weaning ages was 25.65 d. Ages at weaning in middle groups of 24.45 d were faster than those in small groups (27.19 d) (p<0.05). The cycles of sow farrowing per year were 2.27 times. The cycles of sow farrowing of middle farms of 2.35 times was superior to those of small farms of 2.19 times (p<0.05). 4. The average of growing rate up to weaning was 92.47%. Growing rate of middle farms (94.71%) was significantly superior to those of small farms (91.50%) (p<0.05). The body weight at marketing was 112.21 kg. Body weight of large farms (113.30 kg) was heavier than that of small and middle farms (p<0.05). 5. The farrowing rate was positively correlated with litter sizes at weaning (r=0.479), and sow farrowing cylces per 1 year (r=0.382). The litter sizes at sucking was positively correlated with litter size at weaning (r=0.456) and ages at weaning (r=0.392). The correlation between litter size at weaning and growing rate was negative level (r=–0.435).