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Reasons for culling 6454 cows, used between 1909 and 2006 in IZ ZZD Paw³owice were analyzed. The influence of 19 classes of culling reasons on the lifespan within subclasses included in the following years were estimated. The percentage of participation of individual classes of culling in time was analyzed. Cows from the Pawłowice herd were eliminated because of reproduction problems (36.8%), with...
The structure of longevity and relationships between lifespan, reasons of culling, milk yield for lifespan performance have been determined. A heritability factor of 0.126 was estimated. Changes of the longevity structure during course of 98 years were shown. Additionally, the tendency of lifespan to become shorter and, simultaneously, the increase of milk yield in the cow population were shown
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