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The effect of some environmental factors on the ease of calving, calving interval and milk yield of Friesian cows



The effect of some environmental factors on the ease of calving, calving interval and milk yield of Friesian cows



Prace i Materiay Zootechniczne ( 38): 7-12



Data were obtained on 245 Polish Black-and-White Lowland cows that had calved in a tie-barn and on 118 similar cows that had calved in a farrowing shed with boxes. 176 of the cows were primiparous and 187 were multiparous. 189 of the calves were and 174 were and 336 were sired by dairy bulls and 27 by beef bulls. The regression of the ease of calving (graded as 1 = easy, 2 = requiring some assistance and 3 = requiring veterinary assistance) on birth weight of the calf was 0.017 (P<0.01).

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