蘭嶼豬GPI-PGD純合品系全同胞配種後之產仔數

陳文誠 吳明哲 李啟忠 張秀鑾 黃政齊

行政院農業委員會畜產試驗所

蘭嶼豬種GPI-PGD基因型純合品系於1992年建立，GPI和PGD分別為BB型和AA型。第零代的母豬之初產活仔數為4.22+1.02頭(45胎)，爾後採半同胞配種和兩個世代選拔後，14.1%之高近親係數並未影響到母豬的產仔數(3.78±1.13頭，37胎)。本研究利用這個半同胞配種選育的族群，進一步以全同胞配種方式來建立一個更高度近親的品系。因此，同一胎留一公兩母做為種畜。結果僅有16胎(16公32母)仔豬於五月齡被選留，這16個家族的全同胞豬隻分別併欄進行全同胞配種，直至女豬懷孕為止。除3頭女豬未產下活仔豬外，其餘的29頭女豬之產仔日齡平均為320±59天，範圍在243至479天不等。每胎活仔數之平均為3.34±1.34頭，有1至6頭不等。綜合言之，全同胞配種後的蘭嶼豬GPI-PGD純合品系之產仔數並未顯著地降低。

關鍵語：迷你豬、產仔數、近親選拔。

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

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

Taiwan livestock Research Institute, Council of Agriculture

The homozygotic GPI-PGD line of Lanyu breed of pigs was established in 1992 with genotypes of GPI-BB and PGD-AA. The founder sows had 4.22+1.02 piglets born alive at their first parity (N=45). Then, half-sib mating was applied for two generations. An inbreeding coefficient of 14.1% did not affect the litter size of selected gilts at the first parity (3.78+1.13, N=37). In the study, full-sib mating was applied on the half-sib mated population to establish a higher inbreeding line. Hence, one male and two female littermates were selected as stocks, however, there were only 16 litters being selected to form full-sib families (16 male and 32 female pigs) at five months of age. Each family of littermate pigs was raised together in a mating pen till gilts in pregnant. Three out of 32 gilts were no live piglets born. The most of gilts farrowed at 320+59 (N=29) days of age with a range of 243 to 479 days. Number of piglet born alive per litter was 3.34+1.34 head with a range of 1 to 6 piglets. In conclusion, the number of piglet born alive per litter was not affected by the full-sib mating in the homozygotic GPI-PGD line of Lanyu pigs.

Key Words: Miniature pig, Litter size, Inbreeding selection.