Russian Journal of Ecology, Vol. 35, No. 3, 2004, pp. 205–208. Translated from Ekologiya, No. 3, 2004, pp. 235–238. Original Russian Text Copyright © 2004 by Borisenkov, Kalinin, Vakhnina. SHORT COMMUNICATIONS M. F. Borisenkov, A. I. Kalinin, and N. A. Vakhnina Institute of Physiology, Komi Scientiﬁc Center, Ural Division, Russian Academy of Sciences, ul. Pervomaiskaya 50, Syktyvkar, 167982 Russia Received April 10, 2003 Key words: North, cow, calving frequency, conception frequency, seasonal dynamics, geomagnetic activity. Many authors have noted seasonal changes in the 100%). The resulting temporal series were smoothed reproductive function of polyestral animals, for with a ﬁfth-degree polynomial to remove “noise.” The instance, cows. It is supposed that the seasonal dynam- seasonal dynamics of calving frequency were assessed ics of reproduction in cattle is governed by the condi- by plotting the dependence of the total number of calv- tions of their keeping and feeding. At the same time, ings over the entire study period on the month of the there is evidence that the reproductive function of cows year and the dynamics of conception frequency, by depends on meteorological conditions (Vlasov, 1996). shifting the plot of calvings to the left along the tempo- The data on the
Russian Journal of Ecology – Springer Journals
Published: Oct 18, 2004
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