绵羊（Ovis aries）瘤胃内压力升高及继发性瘤胃收缩

Elevated intra-rumen pressure and secondary rumen contractions in sheep (Ovis aries).

Mercer S A, Colvin H W, Backus R C

Department of Animal Physiology, University of California, Davis 95616.

Comp Biochem Physiol A Comp Physiol. 1988;90(3):481-9. doi: 10.1016/0300-9629(88)90224-1.

Abstract

Sheep rumens were insufflated with nitrogen to 5, 10, 15, and 20 cm water pressure and sustained at each pressure for 10 min. 2. Measurements included rumen motility, reticulorumen myoelectric activity, eructation frequency and volume, changes in tracheal pressure and rumen contraction amplitude. 3. As intra-rumen pressure increased, contractions designated as special secondary contractions appeared. 4. At a pressure of approximately 15 cm water, most of the special secondary contractions became regular secondaries; therefore, the special secondaries were called pro-secondary contractions. 5. Increased intra-rumen pressure was associated with respiratory distress. The recovery phase following, rumen insufflation was accompanied by hyperpnea.

摘要

向绵羊瘤胃内充入氮气，使压力达到5、10、15和20厘米水柱，并在每个压力水平维持10分钟。2. 测量指标包括瘤胃蠕动、网瘤胃肌电活动、嗳气频率和体积、气管压力变化以及瘤胃收缩幅度。3. 随着瘤胃内压力升高，出现了被称为特殊二次收缩的收缩。4. 在大约15厘米水柱的压力下，大多数特殊二次收缩变成了规则的二次收缩；因此，特殊二次收缩被称为前二次收缩。5. 瘤胃内压力升高与呼吸窘迫有关。瘤胃充气后的恢复阶段伴有呼吸急促。