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Life span and productiveness and fertility parameters were determined in 904 culled cows, black-and-white in farms situated in the Lublin region of a mean yearly milk production 4500 kg (Center of Purchase of Breeding Animals, Experimental Agricultural Farm) and above 5000 kg (Experimental Agricultural Farm). It was found that in cows from the POHZ 2.4—4.8 calvings were noted and that milk production...
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