李啟忠 吳明哲 陳文誠 張秀鑾 黃政齊
LITTER SIZE IN MITSAI BREED OF PIGS BY FULL-SIB MATING
C. J. Lee, M. C. Wu, W. C. Chen, H. L. Chang and J. C. Huang
Taiwan Livestock Research Institute, Council of Agriculture
Mitsai piglets exhibit coat color with several longitudinal stripes from head to tail, and the brown stripe appears to the white stripe side by side. There were 12 males and 24 females born in 1998 were used and mated by full-sib mating in the study. Gilts produced first litters during 280 and 456 days of age with average age being 335±48 days. Litter size at birth and born alive in first parity were 5.0±1.6 and 4.7±1.8 piglets with ranges from 3 to 9 and 1 to 9 piglets, respectively. Furthermore, litter size at weaned and survival rate at 3 weeks of age were 3.9±1.9 piglets and 83.0% , respectively, with body weight of weaning sows at first parity being 80.3±15.7㎏. The farrowing interval between the first and second parities was 155±12 days. Litter size at birth in second parity was 5.3±1.8 piglets with birth weights being 1.04±0.22㎏(N=53) and 1.05±0.25㎏(N=54) for males and females, respectively. Body weights at weaned and at 5 months of age were 3.63±0.94㎏(N=44) and 27.8±6.1㎏(N=19) for males, and 3.36±0.91㎏(N=45) and 24.1±6.1㎏(N=22) for females, respectively. Results showed that Mitsai sows produced more than 5 piglets per litter at birth and all piglets grew normally when full-sib mating was applied. Also, inbreeding depression due to full-sib mating did not observed in the study.
Key Words: Pig, Full-sib mating, Litter size.