Boar and season effects on some parameters of semen fertilizing potential

Abstract

In order to determine the more accurate fertile potential of sperm, it seems that the conventional parameters of boar semen quality (the ejaculate volume, sperm concentration, progressive motility, percentage of live sperm and of those with intact acrosomal morphology) are insufficient. Since recently, there have been numerous studies proving that protein concentration in sperm plasma has high positive correlation with boar fertile potential. The research objective was to determine the effect of boars as well as the season on the variation of protein content in the sperm plasma. For the research there were used spermal fractions of 2 boars with high (V-boar) and 2 boars with low (N-boar) protein content in spermal plasma. The ejaculates of boars were taken once a week, for a month, during one year (4 *12 = 48 ejaculates per boar). For protein analysis in the spermal plasma, the samples were prepared by centrifugation. The ejaculate volume, protein concentration and progressive motility varied considerably (p lt 0.05 or p lt 0.01) among the boars as well as in one and the same boar. The variations of the same parameters were determined also during both warm and cold season. On the other hand, protein concentration was rather constant, and in V-boars (ranged from 4 to 4.5%) while in N-boars (ranged from 2.3 to 2.6%). The season did not significantly affect (p > 0.01) protein content in sperm plasma (V-boars: 4 to 4.5% in warm and cold season; N-boars: 2.3 do 2.6% in warm and 2.3 to 2.5% in cold season). The obtained results showed that measurement of protein content in boar sperm plasma could be a useful method for their ranking, based on fertile potential of fresh semen.

U cilju određivanja što tačnijeg fertilizacionog potencijala spermatozoida, čini se da konvencionalni parametri kvaliteta semena nerastova (volumen ejakulata, koncentracja spermatozoida, progresivna pokretljivost, procenat živih spermatozoida, kao i onih sa intaktnom akrozomalnom morfologijom) nisu dovoljni. Od nedavno, postoje brojna istraživanja koja dokazuju da koncentracja proteina u spermalnoj plazmi ima visoku pozitivnu korelaciju sa fertilizacionim potencijalom nerastova. Cilj ovog istraživanja bio je da se utvrdi efekt nerasta kao i uticaj godišnje sezone na varijaciju sadržaja proteina u spermalnoj plazmi nerastova. Za ispitivanja su korištene spermalne frakcje 2 nerasta sa visokim (V-nerast) i 2 narasta sa niskim (N-nerast) sadržajem proteina u spermalnoj plazmi. Ejakulati su od nerastova uzimani jednom nedeljno, u okviru jednog meseca, tokom godinu dana (4*12=48 ejakulata po nerastu). Za analizu proteina u spermalnoj plazmi, uzorci su pripremljeni centrifugiranjem. Volumen ejakulata, koncentacja spermatozoida kao i progresivna pokretljivost su značajno varirali (p lt 0,05 ili p lt 0,01) između nerastova kao i kod jednog te istog nerasta. Varjacje istih parametara utvrđene su i tokom tople odnosno hladne sezone godine. Sa druge strane, koncentracja proteina je bila prilično konstantna, i kod V-nerastova (kretala se od 4 do 4,5%) i kod N-nerastova (kretala se od 2,3 do 2,6%). Sezona nije značajno uticala (p > 0,01) na sadržaj proteina u spermalnoj plazmi (V-nerastovi: 4 do 4,5% u toploj i hladnoj sezoni godine; N-nerastovi: 2,3 do 2,6% u toploj i 2,3 do 2,5% u hladnoj sezoni godine). Dobijeni rezultati pokazuju da bi merenje sadržaja proteina u spermalnoj plazmi nerastova mogao biti koristan metod za njihovo rangiranje, a na osnovu fertilizacionog potencijala svežeg semena.