Productive life and lifetime productivity of Black-and-White cows kept in the loose barn system
2006
Dorynek, Z., E-mail: [email protected] | Pytlewski, J. | Antkowiak, I. (Akademia Rolnicza, Poznan (Poland). Katedra Hodowli Bydla)
The aim of the study was to determine the length of life, productive life and lifetime productivity of Black-and-White cows (with a high share of Holstein-Friesian genes in their genotype) kept in the free barn system. As a result of the conducted analyses it was shown that cows kept in the free barn system were characterized by a too short life and productive life, while their lifetime productivity expressed in kilograms of milk, butterfat and protein was relatively high. Statistical analysis did not show differences between the lengths of life for cows removed from the herd for the above mentioned reasons. In contrast, it was found that animals culled due to these causes differed in the length of their productive lives and the number of milking days. The least advantageous values of the analysed traits of milking performance were found in the group of cows culled due to sterility and casualties
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