CORRECTION OF THE REPRODUCTIVE FUNCTION OF COWS DURING THE SUMMER MONSOONS OF THE PRIMORYE

Abstract

The article presents the analysis of materials of the primary zootechnical accounting and also the results of own researches of cows reproductive ability by year seasons on the dairy farms of Primorye and Priamurye. The analysis of the primary zootechnical accounting for the last five years detected the significant difference in calving quantity by year seasons. 46,2 % of cows from 4460 cows calved in spring, 11,7 % - in summer. In the same time the inter-seasons differences turned out to be less significant on the farms with year-round stable maintenance. For a number of years, the influence of individual meteorogical factors (temperature, air moisture, atmospheric pressure, sun activity, sunshine duration, magnetic storms) has been studied. The part of air temperature influence and air moisture varied from 0,02 to 0,09; atmospheric pressure – from 0,01 to 0,11; sunshine duration – from 0,05 to 0,33. The results of different years of observations are practically the same, and they indicate the weak influence of these factors, spontaneous display of cows wish in the pasture. The prolongivity of the sunshine is exception. The higher means of the factorial dispersion were received when using the monthly average means of weather during the pasturable period, but not when using the average daily or average day (morning, afternoon, evening) means. The calculations showed, that the higher the temperature, the worse the cow fertility. During seven summer seasons in different years on dairy farms with different levels of cow productivity, the effect of the standard extract of Eleutherococcus senticosus roots on fertility in the summer heat was studied. Average for all years of the experiment the fertility became higher on 15,68 %.(P< 0,001,t_d=4,9).