Resumen de Influencia de la edad de castración y del nivel de proteína de la dieta de la dieta y relación de aminóacidos limitantes en dicha dieta sobre la composicion química de la carne de terneros frisones

Carlos Sañudo Astiz, Erica Muela Garrido, María del Mar Campo Arribas, M.V. Valero, Virginia Celia Resconi Briggiler, Paula Monge Aísa, 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.