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TheÂ storage in liquid form, atÂ 17 oC Â for several days is still the most used method of semen preservation in boar. In these conditions, it would be of great values to know the factors that can predict the capacity of an ejaculate to maintain its biological value over preservation period. This study aimed to identify the correlations between some parameters of raw semen and those of extended semen, stored in liquid form, for three days at 17 oC. Over 100 ejaculates were collected by means of manual method and artificial vagina over a period of two years from 400 mature boars housed in a specialized unit in Germany. The semen was examined immediately after collection (before dilution) as well as after three days of preservation. All the parameters (except the volume) were determined by means of computerized instruments. The examination of raw semen was performed using SQA-Vp, while the stored semen was analyzed using SpermVision version 3.7. All data were processed with IBM SPSS Statistics version 21. The Pearson correlation revealed no strong correlation between any of the raw semen parameters when analysed together with stored semen parameters. However, some moderate or weak correlations were found, for example a positive correlation between motility of raw semen and motility of stored semen (p<0.01), a positive correlation between percentage of morphological normal sperm in raw semen and the motility of stored semen (p<0.01), a negative correlation between the concentration of raw semen and the linearity and wobble coeficient in stored semen (p<0.01) as well as a couple other weak correlations. We conclude that, despite the fact that some correlations were revealed, unfortunately the analyzed parameters of raw semen have low predicitive value on the parameters of extended semen after preservation at 17 oC, and that the seminal parameters will behave differently from one ejaculate to another.

Correlations between some Parameters of Raw and Stored Semen in Boar