Effect of age at first calving on the evaluation of breeding potential of dairy cattle and its correlation to test day productivity

The research has been carried out with cows of the Bulgarian black-and-white cattle in 10 farms from various regions in the country. The cows calved in the period 1995 – 2006. A total of 1460 cows with 2852 lactations from І-st to ІІІ-rd and respectively 27228 controls have been inclu
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