李世昌(1) 張秀鑾(1) 吳明哲(1) 黃鈺嘉(1) 賴永裕(1) 王旭昌(2) 宋永義(3)
(1)行政院農業委員會畜產試驗所 (2)財團法人中央畜產會 (3)國立台灣大學畜產系
PREDICTION OF BREEDING VALUES FOR REGISTERED
TAIWAN LANDRACE, YORKSHIRE AND DUROC PIGS
S. C. Lee(1), H. L. Chang(1), M. C. Wu(1), Y. C. Huang(1), Y. Y. Lai(1), H. C. Wang(2) and Y. Y. Sung(3)
(1)Taiwan Livestock Research Institute, Council of Agriculture
(2)National Animal Industry Foundation (3)National Taiwan University
There were 112,000 litters produced during April 1989 and January 2000 from 33,931 registered sows in Taiwan Swine Herdbook used in the study, including 56,687, 20,947 and 34,366 litters from 17,127 Landrace, 6,287 Yorkshire and 10,517 Duroc sows, respectively. Litter size born alive was the reproductive trait considered. Genetic evaluation model included breed, season and year of sow at birth, season and year as well as parity of sow at farrowing as fixed effects, age in days at farrowing and its quadratic as covariates, additive genetic effects and error as random effects. There were two classes in sows' birth and farrowing seasons, hot and cool seasons. The former was defined as from April to October and the latter was for the rest months of the year. Parity of sows at farrowing was also classified as two levels, first parity and parous sows. Estimates of heritability from additive genetic variances via REML for the trait evaluated was 0.237, which was then implemented in the animal mixed linear model to estimate and test the corresponding fixed effects (BLUE) and to predict the random additive genetic values of animals (BLUP). Parous sows produced 0.79±0.02 piglets more than those of first parity sows (P<0.001). Also, sows born and littering at cool season had 0.05±0.02 (P<0.01) and 0.10±0.01 (P<0.001) piglets more than those of born and littering at hot season ones, respectively. Furthermore, BLUP of additive genetic values and top 50 across breeds ranking for registered stocks as well as top 20 within breed ranking for the trait evaluated were listed in the search system with URL (http://www.angrin.tlri.gov.tw/) available for selection purpose.
Key Words: Breeding value, BLUP, Registered pigs.