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Retention of calcium, phosphorus and magnesium in dairy cows fed one- or two-component rations


, : Retention of calcium, phosphorus and magnesium in dairy cows fed one- or two-component rations. Acta Zootechnica Universitatis Agriculturae Nitra 28: 185-194

During April-May 1972, (i) a group of 3 Slovakian Pied cows in the 2nd month of the 7th lactation each received a daily ration of 30 kg maize silage, 6.7 kg of a mixture of 4.2 kg cereals and 2.5 kg dried sugar beet pulp and 0.06 kg mineral supplement; while (ii) a matched group of 3 cows received similarly a ration of 20 kg maize silage, 10 kg lucerne haylage and 6.7 kg of a mixture of 4.2 kg cereals (different from that for (i)) and 2.5 kg dried sugar beet pulp. (i) ration supplied daily/cow 65 g Ca, 46.6 g P and 69.5 g Mg, and (ii) ration supplied respectively 94.7, 45.1 and 78.0 g. Mean daily milk yields were 22.4-24.9 l. in (i) and 19.5-23.2 l. in (ii). Mean Ca content of (i) milk was 0.933 g/l. vs. 1.149 in (ii) (P < 0.05); there were no significant differences in P contents (0.637-0.725 g/l. vs. 0.716-0.742) or in Mg contents (0.082-0.095 g/l. vs. 0.081-0.091). It is considered that both (i) and (ii) rations should be supplemented with P.

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