title: [Determination of amino acid balance in the gastrointestinal tract of chickens].
abstract: 11 different feedstuffs (barley, wheat, rye, oat, wheat bran, soybean meal, peanut meal, cottonseed meal, rapeseed meal, horse bean, fish meal) were tested with adult colostomized broiler hens in digestion experiments; the digestibility of the crude protein and the amino acid (AA) balance of the gastro-intestinal tract were ascertained. The results achieved can be summarised as follows: The AA-composition in faecal protein is relatively independent of the AA-composition of the feedstuffs, it is not constant, however. The NPN-quota in faecal crude protein rises with the increasing crude fibre content in the feed. AA-digestibility calculated from the balance of the gastro-intestinal tract is, with the exception of some AA, in particularly the limiting ones, higher than the digestibility of the crude protein. As the AA-balance of the gastro-intestinal tract does not give a realistic picture of the digestibility of the AA, we recommend to ascertain the AA-balance up to the end of the small intestines in order to gain more profound knowledge with the help of such basic investigations with selected feedstuffs.
mesh_terms: D000596:Amino Acids / Q000378:metabolism*; D000818:Animals; D002645:Chickens / Q000378:metabolism*; D003125:Colostomy; D004032:Diet; D004044:Dietary Proteins / Q000378:metabolism; D004063:Digestion; D004064:Digestive System / Q000378:metabolism*; D005260:Female; D005504:Food Analysis
chemical_list: D000596:Amino Acids; D004044:Dietary Proteins
vernacular_title: Untersuchungen zur Bestimmung der Aminosäurenbilanz des Magen-Darm-Traktes beim Hühnergeflügel.