Some economically useful signs of the pigs of a Large White breed in OOO “Rossyia”

Abstract

The researches were carried out in ООО “Rossyia” of the Mozhginsky district of the Udmurt Republic. The object of the research was the sows of the main herd of a Large White pig breed. The reproductive qualities of the sows were studied according to such indicators as: the multiple births, the milkness, the mass of a nest in 2 months. The study of reproductive qualities was carried out using breeding cards of the sows and a book for registering farrowing and offspring of the pigs. The evaluation of the reproductive qualities of sows was carried out by calculating the indicators of a variational statistics: the arithmetic mean, the mean quadrate deviation, the coefficients of the variation, the heritability, the correlation. The indicator of a variational statistics was calculated according to the method of N.A. Plokhinsky. The reliability of the coefficients of the heritability and the correlation was determined using Student's t-test. Then studying the reproductive qualities of the sows of the main herd it was established that the multiple births in the average was 10.61 heads, the milkness — 51.34 kg, and the mass of a nest in 2 months — 156.72 kg. Hereat the coefficient of the variability on the multiple births was 12.95%, on the milkness — 8.41%, and on the mass of a nest in 2 months — 10.02%. The coefficient of heritability on the multiple births was 15.00%, on the milkness — 20.00%, and on the mass of a nest in 2 months — 25.00% (P > 0.999). The coefficients of the correlation between the multiple births and the milkness and the multiple births and the mass of a nest in 2 months, respectively, were r = +0.769 and r = + 0.474, and the coefficient of the correlation between the milkness and the mass of a nest in 2 months — r = + 0.754 under the probability of the infallible prognoses P > 0.999.