Study on breeding performance of pure breed swine. 2. Factors effecting gestation periods of sows
Suthut Siri | Apichai Ratanawaraha | Somjit Boonsukjai
Data of 689 litters representing 497 litters of Large White, 149 of Landrace, and 43 of Duroc at chiang Mai Livestock Breeding Station were Studied. Correlation between the gestation lengths and the litter sizes, weights at births and also the average birth wights were -0.188, -0.116 and 0.168 respectively. The breeds had no significant effect on the gestation lengths, nor did the year and season of farrowing. The average gestation lengths of Large White, Landrace, and Duroc were 114.39 +- 2.38, 113.97 +- 2.32, and 115.81 +- 1.58 days respectively. But the dam effect was highly significant (P0.01) as well as the parity, the litter sizes at birth, and the litter weights at birth also gave the significant effect (P0.05) on the gestation lengths However, the effect of the litter weights at birth was not statistically significant.
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