Comparative efficiency of dairy cow's diets in case of use of various power parameters | Сравнительная эффективность рационов молочных коров, сбалансированных по различным энергетическим показателям
2011
Rajkhman, A.Ya., Belarus State Academy of Agriculture, Gorki (Belarus)
In course of the research there were analyzed and composed the optimal rations of lactation cows. As a result of realized research it was revealed that the optimization of cow rations by metabolite energy provided increase of production efficiency in comparison with rations optimized by old system. It was impossible to balance simultaneously on exchange energy and fodder units of dairy cattle feeding rations, based on a corn silo. At securing of fodder norm with fodder units it was observed a lack of exchange energy. This deficiency of energy, expressed in absolute units (mj), increased with efficiency growth, and in relative - remained within 8-12%. On the contrary, at a choice of a combination of forages at which exchange energy corresponded to norm, in rations it turned out always superfluous quantity of fodder units which increased from 1 to 2.5 units in days. With growth of dairy productivity (in the research - from 10 to 26 kg) possibility of approach of a ration to an ideal variant (full equation on energy and organic substances) decreased that was accounted for restriction on quantity of forages and their variety (weak combination theory) on the one hand, and deficiently high quality of forages - with another. At low cow efficiency of cows (to 12 kg) practically had no value: rations on fodder units or on exchange energy were made. At average and high productivity the rations, made on exchange energy (at equality of other nutrient availability indicators), provided increase of cow productivity and decrease of feed consumption. There was obtained additionally 2.16 kg, and at high - 3.64 kg of milk a day. Expenses of exchange energy decreased accordingly on 0.16 and 0.57 mj on 1 kg of milk.
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