Zander R, Gruhn K, Hennig A
Sektion Tierproduktion und Veterinärmedizin, Karl-Marx-Universität Leipzig, Wissenschaftsbereich Tierernährungschemie.
Arch Tierernahr. 1987 Mar;37(3):227-34. doi: 10.1080/17450398709428238.
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.
在两项实验中，以去盲肠肉鸡为实验对象，用15N标记的小麦秸秆和15N标记的小麦研究了秸秆氮的代谢以及秸秆对尿中氮排泄的影响。在实验1中，将实验动物分为4组，每组动物每天除接受120克混合饲料外，还分别给予0克、20克、30克和40克秸秆粉。秸秆每日的15N过量摄入量（15N'）分别为18.4毫克、27.5毫克和36.7毫克。实验2中，与标记小麦一起每日消耗的15N'量为119.7毫克。40克秸秆粉使尿量显著增加（p<0.05）。尿氮和尿酸氮的量仅呈增加趋势。平均而言，由于添加秸秆粉，生产性氮从每只动物每天1070毫克（对照组）降至添加40克秸秆粉后的每只动物每天764毫克。秸秆粉添加对标记小麦的生产性15N'没有影响。秸秆的生产性15N'从每只动物每天3.8毫克（20克秸秆）增加到每只动物每天13.4毫克（40克秸秆）。与15N小麦相比，作为15N源的秸秆导致尿酸氮的标记率低于尿氮。可以推测，秸秆氮代谢的变化受肠道微生物过程的影响。
