Carlos Sañudo Astiz, Erica Muela, M.M. Campo, M.V. Valero, Virginia Celia Resconi Briggiler, P. Monge, Carlos Alberto Fugita, O. Catalán, I. N. Prado
The effect of castration age (15 days vs. 5 months), protein level (13 vs. 15%) and lysine/methionine (lys/met) ratio (3.0 vs. 3.4) in the diet on meat composition was studied in sixty four Friesian steers intensively reared. Castration age only affected muscle moisture and n-6/n-3 ratio, all of them higher in late castrated animals. High protein level produced meat with lower protein percentage and increased the percentage monounsaturated. High lys/met ratio produced meat with higher protein level and decreased the percentage of saturated fatty acids. Globally, it could be recommended diets with higher lysine/methionine ratios (3.4) by reducing the methionine content and early castration. In any case economical results, depending on the cost of the diet, should be considered.
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