Effects of an abrupt change in ration from all roughage to high concentrate upon rumen microbial numbers in sheep.

Applied Microbiology
J A Grubb, Burk A Dehority

Abstract

When three sheep were abruptly changed from a ration of 100% orchardgrass hay to 60% cracked corn-40% orchardgrass hay, fed at equal dry-matter intakes, significant increases in concentration were observed in the rumen microbial population. Bacterial numbers (colony counts) per gram of rumen contents did not appear to have stabilized within 21 days after the ration change; however, protozoan numbers per milliliter plateaued after 5 days. The concentration of cellulose-digesting bacteria varied considerably between animals and decreased in all animals with the change. Changes were observed in total and molar percentages of volatile fatty acids, which were typical for the two types of rations. Although the concentration of protozoa increased after the ration change, only minor differences were observed in their percent generic distribution. A significant decrease in rumen volume was measured in two of the three sheep with the change in ration; however, fluid turnover rates were not significantly affected. Rates of rumen dry-matter turnover were slower with the concentrate ration, although rumen dry-matter digestion was increased. Calculation of total bacterial numbers based on total rumen volume completely negated the effect of r...Continue Reading

References

Mar 1, 1973·The British Journal of Nutrition·M AbeF Kumeno
Feb 1, 1969·Journal of Dairy Science·K Nakamura, S Kanegasaki
Jul 1, 1969·Journal of Bacteriology·B A Dehority
Sep 1, 1967·Journal of Bacteriology·B A DehorityP Kowaluk
Apr 1, 1962·Journal of General Microbiology·A C WARNER
Mar 1, 1950·Bacteriological Reviews·R E HUNGATE

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Citations

Apr 1, 1983·Applied and Environmental Microbiology·B A DehorityJ B McLaren
Oct 1, 1990·Applied and Environmental Microbiology·G TowneK E Kemp
Nov 1, 1976·Applied and Environmental Microbiology·B A Dehority, J A Grubb
May 8, 2019·Animal : an International Journal of Animal Bioscience·R A RunaA Riek
Jan 24, 2020·Research in Veterinary Science·Rukhsana Amin RunaLea Brinkmann
Jun 22, 2012·Animal : an International Journal of Animal Bioscience·R Khiaosa-ArdF Leiber
Dec 21, 2012·Animal : an International Journal of Animal Bioscience·M GaulyC Wrenzycki

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