The dynamics of growth and productivity of sperm of simmental bull-sires

E. I. Fedorovich, V. V. Fedorovich, I. Z. Siratskiy, O. V. Boyko, I. V. Guzev, V. O. Kadish

The age increasing and basical spermproduction indexes of livestock of bulls of Simmental breed was investigated. It was shown that the increasing of the cattle living mass is realized irregularly. The highest increasing was marked in livestock of bulls from the period of born till the 24th-month age and after 3-years old they were reduced rapidly. The relative growth speed was also reduced during there lifecycle.

It was identify that the level of spermproduction of livestock of bulls of Simmental breed has age differences. High connections between bulls sex bodies measures and living mass (r=0,450-0,780) and age (r=0,420-0,790), between spermproduction characteristics and living mass (r=0,690-0,880), measures of sex bodies (r=0,130-0,920) and age (r=0,620-0,890) was shown.

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