Effect of season on
boar semen quality and enzymatic activity of aspartate aminotransferase
Frydrychová S., Lustyková A., Lipenský J., Rozkot M.
Institute of Animal
Science, Praha Uhříněves, Czech Republic
Abstract
The objective of this study was to find out
the effects of season on semen quality
parameters and enzymatic activity
of aspartate aminotransferase (AST) in the fertile hybrid AI boars (n=139
ejaculates) in a period of 4 years. Semen volume, sperm motility, sperm
concentration, percentage of morphologically abnormal spermatozoa (MAS), total
number of spermatozoa per ejaculate and the AST activity in supernatants and in
spermatozoa was assessed. Boars were divided into four groups according to
season period of the year: winter (1st-3rd month), spring (4th-6th month), summer (7th-9th month) and autumn (10th-12th month).
Sperm motility was significantly higher (P<0.05) in winter and spring vs.
summer and autumn. Percentage of MAS was significantly higher (P<0.05) in
summer and autumn vs. winter and spring. Sperm concentration was
significantly the lowest (P<0.05) in autumn vs. winter and spring. Activity
of AST in supernatant was significantly the higher in summer and autumn
(P<0.05) which could be due to lower motility and higher incidence of MAS.
The highest AST values in spermatozoa were found in winter and spring (P<0.05).
In conclusion, results of this study detected effect of season on semen quality parameters particularly sperm motility and
MAS and on AST activity in
supernatant and in spermatozoa.
Key Words: Boar, aspartate aminotransferase, seasonal effect, semen quality