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Hodowcy stosując krzyżowanie międzyrasowe, czy też międzyodmianowe bydła dążą do zrealizowania co najmniej dwóch celów, a mianowicie hodowlanego oraz produkcyjnego. Jak wiadomo w Polsce od blisko dwudziestu lat obie rasy nizinne czarno- i czerwono - białe krzyżowane są bydłem holsztyńsko -fryzyjskim. Z perspektywy tego dwudziestolecia zauważyć można, że znajomość kanonów tej metody hodowlanej miała...
The data of 234 lactations In 111 bw cows, 217 lactations in 118 crossbred /50% HF/ cows and 275 lactations in 135 crossbred half-blood Swedish-freslan cows were studied. The cows were used in three herds of high productivity /average yield in bw primlgravida during 305 day lactation period reached 390 kg/ in south-west Poland. Statistically significant differences in milk production traits were shown...
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