蘭嶼豬種GPI/PGD遺傳型純合品系採半同胞配種後之產仔數

陳文誠 李啟忠 曾晉郎 張秀鑾 吳明哲

臺灣省畜產試驗所

蘭嶼豬種GPI/PGD遺傳型純合品系於1992年建立，GPI和PGD分別為BB型和AA型。第零代的10公50母，以1公5母併欄配種，初產活仔數和第二產活仔數分別為4.22+1.02頭(45胎)和5.23+1.97頭(35胎)。依據種母豬初產和第二產產仔數平均之高低，挑選產仔數高的種母豬之初產所生的公仔豬10頭(每胎僅一頭)和母仔豬50頭為第一代種豬。再進行1公5母的半同胞併欄配種，第一代種母豬的分娩年齡為1.0、1.5和2.0歲時，其每胎活仔數分別為1.82±2.47(36胎)、3.02±2.56(30胎)和5.02±2.26頭(34胎)。第二代種豬挑選自高產的母豬於兩歲齡所生的仔豬群，計有公仔豬10頭(每胎僅一頭)和母仔豬50頭為第二代種豬。第二代種豬仍採1公5母的半同胞併欄配種方式，第二代種母豬的分娩年齡為1.0、1.5和2.0歲時，其每胎活仔數分別為3.78±1.13(37胎)、4.13±1.26(39胎)和4.34±2.01(35胎)。結果顯示蘭嶼豬種GPI/PGD遺傳型純合品系採半同胞配種和兩個世代選拔後，進親配種並未影響到母豬的產仔數。

關鍵語：迷你豬、產仔數、選拔。

LITTER SIZE OF THE HOMOZYGOTIC GPI/PGD LINE IN LANYU
BREED OF PIGS WITH HALF-SIB MATING

W. C. Chen, C. J. Lee, J. L. Tzeng, H. L. Chang and M. C. Wu

Taiwan Livestock Research Institute

The homozygotic GPI/PGD line of Lanyu breed of pigs was established in 1992 with genotypes of GPI-BB and PGD-AA. Ten boars and 50 gilts as the founder and one boar and five gilts were raised in a mating pen. Numbers of born alive per litter at first (N=45) and second (N=35) litters of founder sows were 4.22+1.02 and 5.23+1.97 piglets, respectively. Based upon the rank on the mean size of two litters of founder sows, then 10 male (only one from each litter) and 50 female piglets in the first litters of founder sows were selected as stocks of Generation one (G1). Half-sib mating was used and one boar and five gilts were raised in a mating pen. Numbers of born alive per litter produced by G1 sows at 1.0, 1.5 and 2.0 years of age were 1.82+2.47 (N=36), 3.02+2.56 (N=30) and 5.02+2.26 (N=34) piglets, respectively. Stocks of Generation two (G2), 10 boars and 50 gilts, were selected from the population which piglets were farrowed by two years old G1 sows. G2 stocks were raised with one boar and five gilts per pen in half-sib mating. Numbers of born alive per litter produced by G2 sows at 1.0, 1.5 and 2.0 years of age were 3.78+1.13 (N=37), 4.13+1.26 (N=39) and 4.34+2.01 (N=35) piglets, respectively. In conclusion, the number of born alive per litter was not affected by the half-sib mating method after two generations of selection in the homozygotic GPI/PGD line of Lanyu pigs.

Key Words: Miniature pig, Litter size, Selection.