UTILIZAÇÃO DE CANA-DE-AÇÚCAR HIDROLISADA COMO PRINCIPAL FONTE DE VOLUMOSO NA ALIMENTAÇÃO DE VACAS MESTIÇAS GIR X HOLANDES

Abstract

The sugar cane is a rich food in energy, presents high productivity, is available in the dry season and after the maturation keeps its nutritional value practically similar. However, sugar cane presents low digestibility of fiber that can decrease the dry matter intake. The alkaline treatment in the sugar-cane with Ca(OH)2 can increase the fiber digestibility. The experiment was conducted using 24 dairy cows, with production of milk about of 17 kg.d-1 and corporal weight 500kg. The treatment was constituted of four experimental rations: a ration base contends cottonseed, urea, minerals, sunflower seed and sugar-cane in nature and another contends the same ingredients but using hydrolyzed sugar-cane at 1% as sugar-cane in nature and sunflower meal and sunflower oil. Were collected feces samples with intervals of two hours, representative of a collection day to verify the levels of Ca, P and Mg of cows feces. Just de Ca presents significant difference. Three collected of blood was made in mammary vein, with intervals of two hours before the meal, soon after the meal and four hours after the meal to verify the levels of Ca, P and Mg of cows blood feds with diets with high concentrations of Ca. The results were (mg/dl) 8.19, 7.96 and 6.64 for Ca, 7.475; 6.38 and 6.72 for P and 2.13; 1.88 and 2.23 for Mg, for samples made two hours before the meal, soon after the meal and four hours after the meal. Just de Mg presents significant difference.