Fertility in cattle breeding is a problem concerning the herd during all its development and must be carefully controlled in all its aspects. The parameters utilized for control and study of reproduction are numerous: every one must be related to the times required for cows reproductive function. For this purpose we considered in this research three parameters: age at 3rd calving, mean interval between calvings and mean service number per calving. The last two parameters show both the course of reproductive function during all the cow’s life, and her pregnancy possibility; the first parameter, i. e. the age at third calving may give information about the precocity of the cow and the reproduction course; this information may be got when a judging criterion is still useful for selection. In this research we have tried to analyse the meaning of the three parameters and their practical behaviour inbreeding.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 3, Madrid, Spain, 701–706, 1974
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