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Different calcium and phosphorus levels in starter type mixtures for calves


, : Different calcium and phosphorus levels in starter type mixtures for calves. Roczniki Nauk Rolniczych Seria B Zootechniczna 103(2): 41-52

The experiment was carried out with 40 black-and-white breed calves aged from 2 weeks to 3 months. The animals were divided into four experimental groups. Feed rations were composed of the concentrates tested, meadow hay and milk replacer administered until the 50th day of life. In the experimental period there were determined the weight gains, feed consumption, apparent digestibility of nutrients and Ca and P balances. In the third month of the experiment blood was collected from the zygomatic vein of the calves in order to determine the contents of morphotic and chemical components. The concentrates contained, respectively; 20, 16, 16 and 16% total protein, 0.82, 0.65, 0.85 and 1.10% Ca, and 0.61, 0.50, and 0.63% P in dry matter. The mean twenty-four-hours' gain was, respectively: 622, 672, 624 and 678 g, and consumption of total digestible protein for 1 kg gain was 511, 426, 483 and 450 g. The difference in protein consumption between group I and the others appeared statistically significant (P .ltoreq. 0.05). Ca retention ranged from 4.94 (group II) to 7.24 g/day/head (group III), and P retention from 3.82 (group IV) to 5.41 g/day/head (group I). The values for P retention differed significantly (P .ltoreq. 0.01). It has been acknowledged that, irrespective of the protein content in the concentrate, the level of Ca should be 0.8, and that of P - 0.6%.

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