INFLUENCE OF THE TEMPERATURE FACTOR ON SPERM PRODUCTION AND REPRODUCTIVE QUALITIES OF BREEDING BOARS

Abstract

A preliminary analysis of the sperm production quality in breeding boars in SVK Lim-ited Liability Company of the Krasnogvardeisky District in the summer period (July-August) of 2018 showed that in all ejaculates, a high degree of sperm agglutination was observed. One of the agglutination causes could be infections; however, studies in the veterinary laboratory excluded the presence of infectious diseases in animals. Another factor in the appearance of a large protein amount in the ejaculate could be temperature overheating of animals (tº rose in the building in July-August to 30-32º C). In order to reduce the influence of the temperature factor on the sperm production quality in breeding boars, in 2019, a split system was installed at the artificial insemination point of the SVK LLC, which made it possible to maintain the optimum temperature in the building (19-21º C). An analysis of the sperm production quality in breeding boars in the summer of 2019 (June) showed that the average ejaculate volume was 225,0 ml, the sperm concentration was 0,23 milliard/ml, and sperm motility was 8,8 points, which indicates slight differences with spring (March of 2019) indices (233,3 ml; 0,24 milli-ard/ml; 8,8 points, respectively). The use of the split system in the summer at the artificial in-semination point of pigs made it possible to increase the concentration of sperm in the ejacu-late in breeding boars by 27,7%, the number of rectilinearly moving sperm by 87,8%, which made it possible to obtain in average of 9,2 sperm doses per ejaculate. Maintaining of opti-mum temperature regime (19-21º C) in the insemination or mating building for pigs allows increasing the fertilizing ability of breeding boars’ sperm by 20,7%, multiple fertility by 0,6 piglets per farrow and the piglet survival rate by 8,2%.