title: [Protein utilization as well as crude protein and amino acid requirements of broiler hens].
abstract: After N-balance experiments with broiler hens in the top laying period and the feeding of soybean coarse meal/fish meal protein the protein utilisation values were calculated. The PNu curve and the PEW curve could be described as utilisation values from the N-retention curve (e-function). At an intake of N at which the hen neither decomposed nor retained protein, the utilisation (PNu) for maintenance and egg production was 55.3% and the utilisation of feed protein for egg production 49.4%. Maximum PEW 34.3% could only be ascertained at an N-intake/LW0.67kg of 1500 mg. The corresponding crude protein quota of 18.7 g recommended as crude protein requirement is calculated from this N-quota (xm) and a live weight of the broiler hen of 2804 g. For the same N-quota (xm) and the same live weight of the hens this results in a necessary quota of S-AA of 694 mg per hen and day. Provided the daily feed intake is 145 g and thus the intake of crude protein 18.7 g and that of S-AA 694 mg per hen, the necessary crude protein content of the feed is 130 g per kg original substance and an S-AA concentration which is equivalent to 3.7% of the crude protein (in g/16 g N).
mesh_terms: D000596:Amino Acids / Q000378:metabolism*; D000818:Animals; D002645:Chickens / Q000378:metabolism*; D004044:Dietary Proteins / Q000378:metabolism*; D004435:Eating; D005260:Female; D008954:Models, Biological; D009584:Nitrogen / Q000378:metabolism; D009751:Nutritional Requirements; D010058:Oviposition
chemical_list: D000596:Amino Acids; D004044:Dietary Proteins; D009584:Nitrogen
vernacular_title: Untersuchungen zur Eiweissverwertung sowie zum Rohprotein- und Aminosäurenbedarf der Broilerhenne.