The different inbreed differentiation sows’ reproductive qualities according to some mathematical models and economic effectiveness of their use

V. I. Khalak¹, V. S. Kozyr¹, O. S. Grabovska²

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¹State Institution “Institute of Grain Crops NAAS”,
14 V. Vernadsky str., Dnipro, 49027, Ukraine

²Institute of Animal Biology NAAS,
38 V. Stus str., Lviv, 79034, Ukraine

The large white breed sows’ reproductive qualities using traditional and innovative methods of evaluation are presented, the level of correlations between traits is determined and the economic efficiency of research results is calculated. Sows’ reproductive qualities were studied taking into account the following characteristics: fertility, highfertility, milk yield, number of piglets at weaning, litter weight at weaning at the age of 28–35 days, survival of piglets before weaning. An integrated assessment of sows reproductive qualities was performed according to the sows’ litter uniformity (homogeneity) index by live weight of newborn piglets (Khalak V. I., 2012), sow breeding reproductive qualities index (СІBЯС), (Tcserenyuk O. M., 2010) and Berezovsky M. D. index (Vashchenko P. A., 2019). It has been established that sows of the elite class, according to the sow reproductive qualities selection index (СІBЯС) and the Berezovsky M. D. index dominated peers of class II and class M⁺ in terms of fertility by an average of 33.40%, milk yield by 32.98% and litter weight at the time of weaning by 26.46%. The criterion for selection of highly productive animals are sows of the elite class, 97.85–123.99 points — according to the sow reproductive qualities selection index (СІBЯС) and 40.18–50.58 — according to the Berezovsky M. D. index. The pairwise correlation coefficient between the characteristics of reproductive qualities ranges from –0.307 to +0.995. The number of reliable connections is 85.71%. The maximum increase in production on the nest weight indicator at the time of weaning at the age of 28–30 days (kg) was obtained from sows of the elite class (+11.07%), as well as M⁺ on the sows reproductive qualities selection index (СІBЯС) (+16.16%) and the Berezovsky M. D. index (+16.05%).

Key words: sow, reproductive qualities, index, mathematical model, variability, correlation, economic efficiency

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