[The effect of straw meal on the crude protein and amino acid metabolism and digestibility of crude nutrients in broiler hen breeds. 1. Problems, experimental review and N-excretion in the urine].
The metabolization of the straw N and the influence of the straw on N excretion in urine were studied in 2 experiments with colostomized broiler hens and with 15N labelled wheat straw as well as 15N labelled wheat. In experiment 1 the test animals divided up into 4 groups received 0 g, 20 g, 30 g and 40 g straw meal per animal and day in addition to 120 g mixed feed. The daily 15N-excess (15N') intake from the straw was 18.4 mg, 27.5 mg and 36.7 mg. The amount of 15N' daily consumed with the labelled wheat in experiment 2 was 119.7 mg. 40 g straw meal resulted in a significantly increased amount of urine (p less than 0.05). The amounts of urine N and uric acid N were only increased as a tendency. On average the productive N decreased as a consequence of the straw meal supplement from 1070 mg/animal and day (control) to 764 mg/animal and day after 40 g straw meal supplement. The productive 15N' of the labelled wheat was not influenced by the straw meal supplement. The productive 15N' of the straw increased from 3.8 mg/animal and day (20 g straw) to 13.4 mg/animal and day (40 g straw). In contrast to 15N wheat, straw as a 15N source resulted in a lower labelling of uric acid N in comparison with urine N. It can be assumed that the changed metabolization of the straw N is influenced by microbial processes in the intestines.
Zander
R
R
Sektion Tierproduktion und Veterinärmedizin, Karl-Marx-Universität Leipzig, Wissenschaftsbereich Tierernährungschemie.
Gruhn
K
K
Hennig
A
A
D000596:Amino Acids / Q000378:metabolism*; D000821:Animal Feed; D000818:Animals; D002645:Chickens / Q000378:metabolism* / Q000652:urine; D004044:Dietary Proteins / Q000378:metabolism*; D005260:Female; D009584:Nitrogen / Q000652:urine*; D014527:Uric Acid / Q000652:urine
D000596:Amino Acids; D004044:Dietary Proteins; D014527:Uric Acid; D009584:Nitrogen
Der Einfluss von Strohmehl auf den Rohprotein- und Aminosäurenstoffwechsel und die Verdaulichkeit der Rohnährstoffe bei Broilerzuchthennen. 1. Mitteilung. Problemstellung, Versuchsübersicht, N-Ausscheidung über den Harn.