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Abstract
Harms, R.H. 2001. What levels of amino acids should a feed contain for the commercial laying hen? J. Appl. Anim. Res., 19: 1–24.
A review of the literature was made dealing with amino acid requirements for the commercial laying hen. Egg production in many early studies was very low. Therefore, the suggested requirements were too low. The National Research Council (1994) recommendations for Met, Lys, Trp, Ile and Val are adequate for hens with a daily production of 55g egg mass. An increase in their suggested requirements would be needed for a higher production of egg mass. Their requirement for Thr is too low and the requirement for Arg is too high. A requirement for Cys has been found to be only 175 mg per day for maximum egg mass. The requirements are for corn soybean meal diets. An adjustment must be made when ingredients are used in which amino acids are lower in availability.