Layer 1 has to be satisfying the amino acids requirements for growth and production at a moment
where the feed consumption is lower. At start of lay feed consumption is lower because the birds
have not yet reached their adult body weight. Growth is not completely finished by 28 weeks. With
regard to protein, a requirement for growth is added to the requirement for production.
From a practical point of view, we have estimated that it is necessary to increase the concentration
of amino acids by about 6 % during the 18-28 week period in relation to the feed consumption
observed after 28 weeks.