陳文誠 吳明哲 李啟忠 張秀鑾 黃政齊
LITTER SIZE OF THE HOMOZYGOTIC GPI-PGD LINE IN
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.