The way in which the protein from the combined fodders is used, as well as its use effectiveness by hens requires an even bigger interest, the more the proteic balance for this breed is proven even more difficult to equilibrate under the circumstances in which the entire European agriculture is unbalanced by the decisions of communitary leading institutions of prohibiting the use of animal proteic meals for feeding purposes. The adding in compound feeds of small quantities of essential limit amino-acids may considerably raise their nutritive value, recommending on the basis of the effected researches, the use of a lysin level in compound feeds meant for reproductive hens during the first laying period of 0,80%.