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Milk yield correction for age and season of calving for Red-and-White Lowland and Black-and-White Lowland cows in SW Poland



Milk yield correction for age and season of calving for Red-and-White Lowland and Black-and-White Lowland cows in SW Poland



Roczniki Nauk Rolniczych, B 100(3): 53-66



49 400 lactation records for milk and fat yield and 17 058 for protein yield of Polish Red-and-White Lowland (PL), and 23 227 records for milk and fat yield and 6064 for protein yield of Polish Black-and-White Lowland cows (BL) were classified according to cows' age (25-96 months, 25 groups) and season of calving (6 groups). For both breeds yields increased with age and were highest among cows calving in Oct.-Jan. and lowest among cows calving in June-July.

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