Doyle P T, Moir R J
Aust J Biol Sci. 1980 Jun;33(3):303-7. doi: 10.1071/bi9800303.
Twelve 18-month-old Merino wethers were fed a ground and pelleted diet of equal parts oaten chaff and lucerne chaff. Sulfur flows at the ileum and faecal excretion of sulfur were estimated for two levels of dry matter intake (500 and 1000 g/day) in sheep receiving intraruminal infusions of water or 4.5 g DL-methionine per day. Increasing dry matter intake from 500 to 1000 g/day resulted in greater flows of total sulfur from 660 to 1183 mg/day in the ileum; protein sulfate increased correspondingly from 312 to 585 mg and non-protein organic sulfur rose from 324 to 497 mg; DL-methionine infusions had no effect. The 1000-g level of intake increased the excretion of all faecal sulfur components compared to those of sheep receiving 500 g dry matter; the amino acid supplement increased total, neutral and total reducible sulfur excretion only at the 500-g level of dry matter intake. The apparent digestibility of sulfur in the small intestine ranged from 36 to 44%, while apparent digestibility between the proximal duodenum and anus ranged from 59 to 66%. Most of this digestion was due to a reduction in organic sulfur in digesta during flow through the intestines.
给12只18月龄的美利奴阉羊投喂由等量燕麦秸和苜蓿草粉混合而成的磨碎颗粒饲料。在瘤胃内输注水或每天4.5克DL-蛋氨酸的绵羊中，针对两个干物质摄入量水平（500和1000克/天），估算了回肠中硫的流量以及粪便中硫的排泄量。将干物质摄入量从500克/天增加到1000克/天，导致回肠中总硫流量从660毫克/天增加到1183毫克/天；硫酸蛋白相应地从312毫克增加到585毫克，非蛋白有机硫从324毫克增加到497毫克；输注DL-蛋氨酸没有效果。与摄入500克干物质的绵羊相比，如果摄入量达到1000克，所有粪便硫成分的排泄量都会增加；氨基酸补充剂仅在干物质摄入量为500克时增加了总硫、中性硫和总可还原硫的排泄量。硫在小肠中的表观消化率在36%至44%之间，而在十二指肠近端和肛门之间的表观消化率在59%至66%之间。这种消化作用大部分是由于在食糜流经肠道的过程中有机硫减少所致。
