Clauss Marcus, Fritz Julia, Bayer Dorothee, Hummel Jürgen, Streich W Jürgen, Südekum Karl-Heinz, Hatt Jean-Michel
Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, Winterthurerstr. 260, CH-8057 Zurich, Switzerland.
Zoology (Jena). 2009;112(3):195-205. doi: 10.1016/j.zool.2008.08.001. Epub 2008 Dec 24.
In domestic ruminants, the stratification of forestomach contents - the results of flotation and sedimentation processes - is an important prerequisite for the selective particle retention in this organ. A series of anatomical and physiological measurements suggests that the degree of this stratification varies between browsing and grazing wild ruminants. We investigated the forestomach contents of free-ranging mouflon and roe deer shot during regular hunting procedures. There was no difference between the species in the degree by which forestomach ingesta separated according to size due to buoyancy characteristics in vitro. However, forestomach fluid of roe deer was more viscous than that of mouflon, and no difference in moisture content was evident between the dorsal and the ventral rumen in roe deer, in contrast to mouflon. Hence, the forestomach milieu in roe deer appears less favourable for gas or particle separation due to buoyancy characteristics. These findings are in accord with notable differences in forestomach papillation between the two species. In roe deer, particle separation is most likely restricted to the reticulum, whereas in mouflon, the whole rumen may pre-sort particles to a higher degree. The results suggest that differences in forestomach physiology may occur across ruminant species.
在国内反刍动物中，前胃内容物的分层——漂浮和沉降过程的结果——是该器官选择性保留颗粒的重要前提。一系列解剖学和生理学测量表明，这种分层程度在野生反刍动物的采食和放牧之间有所不同。我们调查了在常规狩猎过程中射杀的自由放养的摩弗伦羊和狍的前胃内容物。由于体外浮力特性，前胃食糜按大小分离的程度在这两个物种之间没有差异。然而，狍的前胃液比摩弗伦羊的更粘稠，与摩弗伦羊不同，狍的瘤胃背侧和腹侧之间的水分含量没有明显差异。因此，由于浮力特性，狍的前胃环境似乎对气体或颗粒分离不太有利。这些发现与这两个物种在前胃乳头形成方面的显著差异一致。在狍中，颗粒分离很可能仅限于网胃，而在摩弗伦羊中，整个瘤胃可能对颗粒进行更高程度的预分选。结果表明，反刍动物物种之间可能存在前胃生理学差异。
