Abstract
The aim of the study was to establish correlation and regression dependencies between some traits of sperm production of terminal boars (Large White x Pietrain). The analyzed material consisted of 347 ejaculates, received in the period from 2011 to 2014. The boars were divided in three groups according to the age the ejaculate was obtained at (up to 12 months, from 12 to 24 months, and above 36 months). A moderate and negative correlation was established (rp=-0.34, p<0.001) between the volume of the ejaculate and the concentration of the sperms in the second age group. With the youngest boars we established poor and positive correlation (rp=0.29, p<0.05) between the volume of the semen and the motility of the sperm. The correlations between the traits concentration and motility are poor in the third (rp=0.18, p<0.05), and moderate in the second age group (rp=0.49, p<0.001). Between the motility from one side and the agglutinated and dead sperms from the other, they are within the range of rp =-0.46 to rp=-0.87, p<0.001. The correlations between the agglutinated and dead sperms are positive, from moderate to high and reliable (p<0.001) in all three age classes. The regression trend between the traits of sperm production are almost the same in all three age groups with the exception of volume of the ejaculate to the concentration of sperms.
Highlights
Artificial insemination (AI) has large economic importance in pig-breeding and in the past twenty years there has been a significant increase in its use
Numerous authors have determined that ejaculates, received from cross-bred boars have better quantitative and qualitative semen traits in comparison with the pure-bred animals – (Kondracki et al, 2003; Wysokińska and Kondracki, 2004) on Szostak and Przykaza (2016)
January 2011 to May 2014, from 11 breeding boars (Large White x Pietrain), bred in a pig farm located in the region around the town of Plovdiv
Summary
Artificial insemination (AI) has large economic importance in pig-breeding and in the past twenty years there has been a significant increase in its use. The results of AI depends mostly on quantitative and qualitative properties of the sperm (Savić et al, 2015). According to Ciereszko et al (2000) cross-bred boars are frequently used for reproduction. Numerous authors have determined that ejaculates, received from cross-bred boars have better quantitative and qualitative semen traits in comparison with the pure-bred animals – (Kondracki et al, 2003; Wysokińska and Kondracki, 2004) on Szostak and Przykaza (2016). The establishment of the correlation and regression regularities appear as a reliable factor for the effective performance of the selection of farm animals (Gerzilov, 2004). All of the above gave us reason to establish the correlation and regression dependencies between some of the sperm production traits of terminal boars (Large White x Pietrain), grouped in three age classes
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