Effect of incrossing on ability supplement of strain pig [Swine]
2008
Kojima, H.(Toyama-ken. Agricultural Research Center (Japan)) | Mizukami, S. | Mizuki, A. | Arayama, E. | Maetubo, N. | Ozaki, M. | Tubokawa, T. | Hirose, T.
The purpose of this study was to select the most effective of incrossing for ability supplement of Large White strain pig Tateyamayork. Incross pigs (WW) were produced by incrossing between sows Tateyamayork and three boar strains (A, B, C) and investigated for breeding performance. The breeding performance of sows WW was evaluated by the litter sizes. When sows WW mated with boars Landrace (L), the litter size of sows WW in B strain was 12.1 and the performance exceeded the ability of the mean of maternal and paternal generation's litter size. There was no different among body weights of the three strain of WWL pigs at birth. However, at four weeks after birth and eight weeks, the body weight of A strain WWL pigs was heavier than that of others and B strain WWL pigs was slightly light. When sows WWL mated with boars Duroc (D), each litter size at birth and number of nursing piglets in three strains was above 10 piglets. In three-way crossbreed piglets (WWLD), the weight of the C strain at four weeks after birth was 10.34kg and heavier than that of others, significantly. Growth speed of the B strain WWL was delayed a little, but there was no delayed in the WWLD. Growths of WWLD fattening pigs were excellent, the same as Tateyamayork, and the daily gain of castration pig was more than 1,000g/day and that of the female was more than 950g/day. From these results, the B strain pig should be the best combination partner for the ability supplement of the Tateyamayork because of sufficient growth and breeding performance. On the other hand, the vaccination program for Tateyamayork could apply to use for WW pigs. It is necessary for the burden alleviate of the pig to consider the number of inoculation times and dose of the vaccine.
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