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Influence of the season and age at first calving on the milk yield of Holstein-Friesian and of Black-and-White Lowland cows in the state pedigree herd at Osowa Sien



Influence of the season and age at first calving on the milk yield of Holstein-Friesian and of Black-and-White Lowland cows in the state pedigree herd at Osowa Sien



Roczniki Akademii Rolniczej w Poznaniu (120, Zootechnika 28): 43-50



For 111 Polish Black-and-White Lowland cows mean 305-day yields in 1st-3rd lactation and overall were 4325, 4333, 4288 and 4319 kg with coeff. of variation (CV) 16.7, 21.6, 20.3 and 19.7% resp. Cows calving first at 27-28 months gave most milk (overall av. 4650 kg) and those calving at 25.5-26.5 months, least milk (av. 4038 kg). Cows calving in the 4th quarter of the year gave most milk (av. 4543 kg) and those calving in the 2nd quarter gave least milk (av. 4084 kg).

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Accession: 000911729

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