Published in Scientific Papers. Series D. Animal Science, Vol. LXI, Issue 1
Written by Alina Elena CUVLIUC, Gheorghe Emil MĂRGINEAN Alexandru KELEMEN, Livia VIDU
The objective of this study was to evaluate the evolution of the main reproduction indices registered by the Holstein cows from Romania, in regard with the correlation between their values and the economic efficiency of the exploitation of this category. The data processed for this paper were collected between 2012 and 2017, and the comparison of the results was made with the results obtained in Romania 20 years ago by another author. The indicators evaluated were: the calving interval, defined as the number of days passed between two consecutive calves, the dry period, represented by the period in which the cows aren't milked and the age of the first parturition, expressed in days. The comparison of the data was done based on the following statistics, determined using the Excel software: mean, mean error, standard deviation, and coefficient of variability. The data presented in this paper were collected from 59 farms located throughout Romania and correspond to 40,770 complete lactations. The overall trend of the values recorded by these indices was improving over time.
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