84 84 The imbalance between amino acids can cause antagonisms, limit protein synthesis, affect behaviour, reduce growth (pullets), cause weight loss, limit production or egg size, and affect bone and shell quality. The concept of ideal protein represents this balance and proposes ratios between the different essential amino acids, assuming that the pullets and hens can synthesise the non-essential ones. Therefore, it would not be necessary to establish a minimum protein level. The balance between the amino acids in the protein is fundamental. Protein is necessary for growth, maintenance, health, and production. Supplementation with synthetic amino acids will help us achieve optimal amino acid levels and even allow for a reduction in diet cost. In any case, excess protein not only carries a metabolic cost due to the need to deaminate the excess amino acids, but it also has environmental consequences due to the higher nitrogen content in the faeces. AMINO ACIDS Recommended ideal protein profile ratios AMINO ACID PRE/STARTER GROWER DEVELOPER PRE-LAY EPP*/ CAGE-FREE CAGES Dig. Lysine 100 100 100 100 100 100 Dig. Methionine 52 57 54 50 54 50 Dig. M + C 80 86 85 90 92 90 Dig. Threonine 67 70 73 70 70 70 Dig. Tryptophan 21 22 23 23 23 22 Dig. Leucine 112 113 118 118 118 118 Dig. Isoleucine 72 77 80 80 80 80 Dig. Valine 82 87 90 88 90 88 Dig. Arginine 115 115 115 108 115 104 *EPP: End of Preparation Period Based on the ideal protein profile, the requirement for each amino acid is established in relation to digestible lysine, which is assigned a value of 100. An increase in the proportion of a specific amino acid can lead to greater egg weight, provided that the overall amino acid profile remains balanced and is not limited by another essential amino acid. AMINO ACIDS LOHMANN › MANAGEMENT GUIDE › NUTRITION › PRODUCTION PERIOD
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