Abstract
The duration of gestation is one of the most important biological features of pigs, which affects the live weight of young animals at birth, the nature of their post-embryonic development, livability and future productivity, in particular the precocity and feed expenditures. The purpose of the research was to study the influence of the duration of sows’ gestation on the growth, development and livability of piglets during the pre-weaning period. The researches have been carried out on the basis of the farm of LLC “Russia” in the Mozhginsky district in the Udmurt Republic. Two groups of lactating sows of Large White breed have been formed for researches by using analogs method. The formation of groups of sows has been carried out taking into account the duration of gestation, age and number of farrows. It has been found as the result of the conducted researches that the piglets obtained from sows with the duration of gestation of 115,16 days significantly exceeded the herdmates born from sows with the duration of gestation of 110,08 days by live weight at birth by 6,40 %, live weight at weaning at the age of 30 days by 5,91 %, average daily gain by 5,85 % and the livability of piglets by 18,84 %. The indicator of the power of the influence of the duration of gestation on the live weight of piglets aged 30 days was 44,0 % with the Fischer confidence criterion (Fst) equal to 6,45 and the probability (reliability) of error-free forecasts at P > 0,99. The indicators of the power of the influence of the duration of pregnancy on the absolute and average daily weight gain, as well as on the number of piglets aged 30 days, respectively, were 43,0 and 46,0 %, with the Fisher confidence criteria of 6,26 and 6,91 and the probability of error-free forecasts P > 0,99 and P > 0,999, respectively. Positive correlation and regression coefficients have been found between the studied traits, which indicate that breeding for the duration of gestation will make it possible to increase the growth, development and livability of suckling piglets.
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