Siciliano-Jones J, Murphy M R
J Dairy Sci. 1986 Sep;69(9):2304-11. doi: 10.3168/jds.S0022-0302(86)80669-5.
Postruminal passage of inert particles varying in specific gravity, length, and time of administration in relation to feeding, as well as interactions among these factors, were studied in four ruminally cannulated steers. Animals were allowed access to a 40% grain mix, 60% long alfalfa hay diet for 6 h daily. Eleven combinations of particle specific gravity (.9, 1.17, 1.41, or 1.77) and length (1, 5, or 10 mm) were used. Two hundred particles of each combination were placed in the abomasum at the beginning of the meal, the end of the meal, or 6 or 12 h after the end of the meal. Recovery of particles in feces within 24 or 48 h of administration and times of first appearance and maximal concentration were examined. Particle recovery 24 h after dosing as a percentage of 48-h recovery and time of maximal concentration in feces best described postruminal passage of inert particles. Passage was affected by specific gravity, but not length, of particles. Those having a specific gravity of 1.17 passed most quickly. Time at which particles were placed in the abomasum in relation to feeding affected the passage of particles varying in specific gravity. This interaction may be important in studies of ruminal passage that depend on marker appearance in feces.
在四头装有瘤胃瘘管的公牛中，研究了惰性颗粒在瘤胃后段的通过情况，这些颗粒的比重、长度以及给药时间与采食的关系，还有这些因素之间的相互作用。动物每天有6小时可采食40%谷物混合料和60%长苜蓿干草的日粮。使用了颗粒比重（0.9、1.17、1.41或1.77）和长度（1、5或10毫米）的11种组合。在采食开始时、采食结束时或采食结束后6或12小时，将每种组合的200个颗粒放入皱胃。检查给药后24或48小时内粪便中颗粒的回收率以及首次出现时间和最大浓度。给药后24小时的颗粒回收率占48小时回收率的百分比以及粪便中最大浓度出现时间最能描述惰性颗粒在瘤胃后的通过情况。颗粒的通过受比重影响，但不受长度影响。比重为1.17的颗粒通过最快。颗粒在皱胃中的放置时间与采食的关系影响了不同比重颗粒的通过。这种相互作用在依赖粪便中标记物出现的瘤胃通过研究中可能很重要。
