Rumen GI Part 4 Flashcards
What contraction is:
Biphasic contraction of reticulum
Food particles are reduced in size
Primary contractions
What contraction has the function of forcing gas towards the cranial portion of the rumen?
Secondary contraction
What has the function to bring large particles from the rumen back to the mouth so that it can be chewed to reduce particle size?
Regurgitation reflex
How many regurgitations occur every 2-3mins?
1
What are the 2 main gases produced during rumination?
CO2 and Methane
Where is the eructation center located, receives afferent fibers from Mechanoreceptors placed in the dorsal sac of the rumen?
Medulla
What occurs in cattle when eructation mechanisms fail?
Tympanism (bloat)
What in cattle is caused by:
Failure of eructation method
Impaired vagal nerve
Bloat
What type of bloat is when cattle feed on lush, rapidly growing alfalfa or clover pastures? Gas becomes trapped in tiny bubbles and normal free gas bubbles cannot accumulate on top of the dorsal sac of the rumen?
Legume bloat
What 2 things control recticulorumen motility?
ENS
Vagus nerve
What receptors monitor distention, consistency of the ingesta, pH, VFA concentration, and ions?
Stretch and chemoreceptors
What diverts milk away from the developing rumen and passes it directly to the abomasum?
Esophageal groove
The esophageal groove is a gutter like invagination traversing the wall of the reticulum from the _______ to the recticulo-omasal orifice
Cardia
What occurs most frequently in high producing dairy cows- within 6wks of calving or late gestation?
Ruminant ketosis
What is associated with hypoglycemia and after calving/lactation?
Ruminant ketosis
