Zaragoza, España
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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