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Duration of herd life and lifetime performance of Polish Black-and-White Lowland and Polish Red-and-White lowland cows and their F1 crossbreds and backcrosses to Holstein



Duration of herd life and lifetime performance of Polish Black-and-White Lowland and Polish Red-and-White lowland cows and their F1 crossbreds and backcrosses to Holstein



Rocznik Nauk Rolniczych 107(3): 65-73



Data were obtained on 483 Polish Black-and-White Lowland (PWBL) cows in 2 herds and 408 Polish Red-and-White Lowland (PRWL) cows in another 2 herds; the animals included F1 crossbreds with Holstein and backcrosses to the Polish breeds. Age at 1st calving was 1 month earlier in PWBLs than in PRWLs; the youngest at 1st calving were the PBWL F1s. PRWL cows significantly exceeded PBWL cows for 1st-lactation milk yield (by 336 kg) and milk fat yield.

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