Аграрный вестник Урала № 12 (92) 2011Ветеринария
INFLUENCE OF BULLS-MANUFACTURERS ON DURATION OF ECONOMIC USE OF DAUGHTERS
Productive longevity of cows is an important economicuseful
sign which it is caused by a number of genotypical
and paratypical factors.
Among numerous genetic factors important value has
influence of bulls-manufacturers on duration of use of
daughters. However in many economy the interrelation
of the given signs is not considered at all. All it leads to
increase in expenses at cultivation and the maintenance
of animals which will not pay off made production for a
short serviceable life. Reduction of duration of use of cows
negatively affects effect of selection: rates of reproduction
and intensity of selection as a whole are sharply slowed
down. Therefore prolongation of term of economic use of cows directly defines economic efficiency of breeding and
commodity milk cattle breeding considerably improving
financial indicators of economy. The estimation of bulls-manufacturers on duration of
use of daughters has been with that end in view spent, and also force of influence of «father» on duration of economic use and lifelong efficiency of cows which estimated on the basis of calculation of an one-factor variance complex is
defined. For researches the database from leaving cows of
three enterprises of the Tyumen region has been generated.
As a result of researches authentic results of influence
of «fathers» on duration of use of daughters have been
durationofproductiveuse, abull-manufacturer, durationofeconomicuse, lifelongefficiency.
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