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PROBABILITY OF EARLY MATURE DAUGHTER FROM EARLY MATURE DAM IN PIGS
H. L. Chang(1), M. C. Wu(1), S. C. Lee(1), H. C. Huang(1) H. C. Wang(2), B. H. Chen(2) and. Y. Y. Song(2)
(1)Taiwan Livestock Research Institute, Council of Agriculture (2) Swine Improvement Foundation of Taiwan
Sows with 1st daughter by one year of age were defined as early mature sows in this study. Data of registered sows born by 1994 was used for analysis. Ages of sow at daughters born were calculated and used to identify the groups of daughters. Gilt was classified in 'eldest daughter' group if age of corresponding dam was by one year of old when gilt was born. Again, gilt was classified in 'younger daughter' group if age of corresponding dam was above 4 years of old when gilt was born. The same definition was applied in identification of granddaughter groups. In total, there were 12,160 registered granddaughter sows with minimum ages at first littering being 266, 296 and 283 days of old in Landrace (L), Yorkshire (Y) and Duroc (D) breeds, respectively included in the study. Results showed that probabilities of 'eldest daughter' from early mature dam being early mature sow were 7.38, 4.41 and 9.19¢Min L, Y and D breeds, respectively. Nevertheless, the corresponding probabilities of 'younger daughter' from early mature sow were 2.57, 191 and 1.84¢Min L, Y and D breeds, respectively which were significantly lower than those observed in 'eldest daughter'. Furthermore, probabilities of the 'eldest' and 'younger' daughters from early mature sows being early mature ones were 7.45©M2.29¢M, respectively which indicated that the probability of the 'eldest daughter' being early mature one was three times that observed in the corresponding maternal 'younger ' female sibs when comparison was made in pooled data with breed effects negligence. In conclusion, it is suggested to select gilts from primiparous sows for replacement in order to shorten generation interval and thus to accelerate the genetic improvement in pig selection program.
Key Words: Generation interval, Breed, Maternal effect.
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