Kreuzer M, Kirchgessner M
Arch Tierernahr. 1985 Oct;35(10):723-31. doi: 10.1080/17450398509425228.
In a digestibility trial 5 semisynthetic rations were fed in 3 periods to 10 male sheep to examine the effects on N balance, components of faecal nitrogen and N digestibility. The rations contained constant amounts of nitrogen but different contents of cellulose and two different types of starch (untreated and steamflaked). Content and type of starch did not show any noticeable effect neither on excretion of undigested dietary nitrogen nor on true digestibility. There could not be noticed any effects on the apparent N digestibility by changing contents of cellulose or untreated starch. If the rations contained steamflaked corn starch, the animals excreted more faecal nitrogen and therefore showed a lower apparent N digestibility. Especially the water soluble N fraction of the faecal nitrogen was clearly higher. Compensation took place through a lower N excretion with the urine. The reason for increased faecal N excretion may be higher microbial protein synthesis in the rumen. This was accented by the allantoin excretion with the urine.
在一项消化率试验中，用5种半合成日粮在3个阶段饲喂10只雄性绵羊，以研究其对氮平衡、粪便氮成分和氮消化率的影响。这些日粮含有恒定的氮量，但纤维素含量不同，且有两种不同类型的淀粉（未处理的和蒸汽压片的）。淀粉的含量和类型对未消化日粮氮的排泄以及真消化率均未显示出任何显著影响。改变纤维素或未处理淀粉的含量对表观氮消化率未产生任何影响。当日粮含有蒸汽压片玉米淀粉时，动物排出的粪便氮更多，因此表观氮消化率较低。特别是粪便氮中的水溶性氮部分明显更高。通过尿液中较低的氮排泄进行了补偿。粪便氮排泄增加的原因可能是瘤胃中微生物蛋白质合成增加。尿中尿囊素排泄量的增加突出了这一点。
