迷彩豬種採全同胞配種後之產仔數

 李啟忠 吳明哲 陳文誠 張秀鑾 黃政齊

行政院農業委員會畜產試驗所

迷彩豬種的仔豬身體兩側有白色橫條紋與紅棕色橫條紋交複排列型態之棕白條紋體色。本研究選用1998年出生的12公24母仔豬，育成後予以全同胞配種。母豬初產日齡介於280~456天，平均335±48天。初產之產仔總頭數為3至9頭(5.0±1.6頭)，活頭數為1至9頭(4.7±1.8頭)，以及三週齡離乳時活頭數平均為3.9±1.9頭，育成率為83.0%。初產母豬哺乳三週後的離乳體重為80.3±15.7㎏。第二產與初產的胎距為155±12天，第二產產仔總頭數為5.3±1.8頭。仔豬出生重公的為1.04±0.22㎏(N=53)，母的為1.05±0.25㎏(N=54)。公母仔豬三週齡離乳體重分別為3.63±0.94㎏(N=44)和3.36±0.91㎏(N=45)，五月齡體重亦分別為27.8±6.1㎏(N=19)和24.1±6.1㎏(N=22)。本研究顯示迷彩豬種雖經全同胞配種，其產仔數仍維持在5頭以上，且其仔豬生長正常，並未有近親衰退的現象。

關鍵語：豬、全同胞配種、產仔數。

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.