Edrise B M, Smith R H
Arch Tierernahr. 1986 Nov;36(11):1019-27. doi: 10.1080/17450398609429523.
Three ruminating calves were each provided with a rumen cannula (from which reticulum samples could be obtained), an abomasal cannula and a sleeve sutured at the omasal-abomasal orifice that permitted digesta flowing from the omasum to be diverted and collected. The calves were each given in turn a high roughage (HR) and high concentrate (HC) diet consisting mainly of dried grass and flaked maize in the proportions by weight of 3:2 and 1:2 respectively. A water soluble non-absorbable marker (polyethylene glycol) and a particulate marker (103Ru-phenanthroline complex) were also given and the diets were sometimes supplemented with MgSO4. For each diet (HR(O), HR(Mg), HC(O), HC(Mg)) samples were taken from the reticulum and omasal outflow. Magnesium, phosphorus, PEG and 103Ru were measured in the samples as taken and liquid-rich and solid-rich fractions prepared from them. From their distributions relative to the two markers, Mg and P flows into and out of the omasum were estimated. Results were too few to show significant differences in absorption efficiency between diets but overall approximately 10-40% of the Mg entering the omasum was absorbed as a net effect implying that this organ may be the major site of Mg absorption in young cattle. For P also substantial amounts entering the omasum (approximately 10-40%) were absorbed in that organ.
三头正在反刍的小牛，每头都安装了一个瘤胃瘘管（可从此处获取网胃样本）、一个皱胃瘘管以及一个缝在瓣皱孔处的套管，该套管能使从瓣胃流出的食糜被分流并收集。依次给每头小牛投喂高粗饲料（HR）和高浓缩饲料（HC），HR饲料主要由干草和压片玉米组成，二者重量比例为3:2；HC饲料主要由干草和压片玉米组成，二者重量比例为1:2。还投喂了一种水溶性不可吸收标记物（聚乙二醇）和一种颗粒标记物（103Ru - 菲咯啉复合物），并且饲料有时会添加硫酸镁。对于每种饲料（HR(O)、HR(Mg)、HC(O)、HC(Mg)），从网胃和瓣胃流出物中取样。对所取样本中的镁、磷、聚乙二醇和103Ru进行测量，并从中制备富液部分和富固部分。根据它们相对于两种标记物的分布情况，估算镁和磷流入和流出瓣胃的量。结果数量太少，无法显示不同饲料间吸收效率的显著差异，但总体而言，进入瓣胃的镁约有10 - 40%被净吸收，这意味着该器官可能是幼牛吸收镁的主要部位。对于磷，进入瓣胃的大量磷（约10 - 40%）也在该器官被吸收。
