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Specific difference in fluctuation pattern of holotrich concentration in the rumen of cattle goat and sheep


, : Specific difference in fluctuation pattern of holotrich concentration in the rumen of cattle goat and sheep. Japanese Journal of Zootechnical Science 54(8): 457-462

Fluctuation patterns in holotrich concentration in the rumen were compared among cattle, goat and sheep, and the cause of a possible difference was examined. Several experiments were done using 2 Holstein cows, 2 Japanese native female goats and 1 Merino ewe which were accustomed to feeding twice daily at 0900 and 1700 h as routine. Holotrich concentrations in the rumen of goat and sheep began to increase prior to the commencement of the routine feeding, but such a prefeeding increase was never detected in cattle when they were fed at an ordinary feeding time as well as when fed an hour later than usual. Sudden delay of feeding in goat and sheep caused an increase in holotrich concentrations in the rumen not only after the actual feeding but also at a time when they usually ingest feed but were not given any on that day. When a goat was isolated and delayed in feeding time for 3 wk, an increase at first seen in the holotrich concentration at an original feeding time disappeared from the 5th day after the isolation and delay. Based on the sequestration-migration theory previously introduced to explain the cause of puzzling diurnal variations in holotrich concentration in the rumen, these results suggest that a contractive movement of the reticulum is related to the migration of organisms into the rumen, and that the contraction may occur in response to the real migration of feed in cattle, but would occur in goat and sheep in response to the stimuli surrounding the routine work of feeding.

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