THE EFFICIENCY OF SELECTION AND THE RELATIONSHIP OF REPRODUCTIVE QUALITIES OF SOWS IN THE CONDITIONS OF INDUSTRIAL FARMS IN THE WESTERN PART OF THE JUTLAND PENINSULA
Abstract
It was established that due to the focus of breeding Danish pigs on improving fertility, its annual increase was 1.63% over the 10 years studied, the number of weaned piglets per sow increased annually during this period by –1.53%, the litter weight of piglets at birth by 0, 81% and at weaning by 0.90%. At the same time, the number of signs negatively correlated with multiple fertility decreased annually over the last decade. Thus, high fertility decreased annually by 0.71%, the weight of one piglet at weaning by 0.52%, the average daily growth during the suckling period by 0.77%, the absolute growth during this period by 0.47%, and the survival of piglets before weaning by 0.08%. But, despite the decrease in some signs of reproductive capacity, due to a significant increase in the number of live piglets at birth, the comprehensive indices of reproductive qualities of sows increased by 1.26–1.45% annually. It has been proven that the intensive selection of sows of Danish breeding to increase fertility contributed to an annual increase of 1.54% in the number of piglets weaned from the sow per year, caused a 0.32% extension of the duration of lactation and increased the mortality of sows by 0.13%. At the same time, along with improving the conditions of keeping and feeding sows, it contributed to a 1.69% reduction in the number of non–productive days in a sow per year, a reduction in annual feed costs per sow by 0.90% and by 2.12% per weaned piggy. According to calculations of the strength and direction of the relationship between the main reproductive and technological traits, it was established that multifertility had a very high direct probable correlation strength with the number of weaned piglets per farrowing (r = 0.95); by the number of weaned piglets per sow per year (r = 0.90); high direct probable strength of correlation with nest mass at weaning (r = 0.81); a weak direct relationship with the duration of lactation (r = 0.28); a weak feedback relationship with the weight of one piglet at weaning (r = – 0.25) and the survival of piglets (r = – 0.11). The number of piglets weaned per sow per year was positively correlated with very high strength (r = 0.96) with the number of piglets at weaning per farrowing; multiple fertility (r = 0.90); moderate strength (r = 0.63) with the weight of the nest of piglets at weaning, weak strength with the duration of lactation (r = 0.03) and preservation – (r = 0.22), and a weak inverse correlation of moderate strength with mass of one piglet at weaning (r = – 0.43). The litter weight of piglets at weaning had a strong positive correlation with multiple fertility (r = 0.81), the number of piglets weaned from a sow per farrowing (r = 0.73) and per year (r = 0.63), a weak positive correlation with the duration of lactation (r = 0.25) and a weak inverse correlation with the survival of piglets (r = –0.20) and the weight of one piglet at weaning (r = –0.18).
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