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• W2767657629 abstract "In the first of two experiments, rumen thiaminase activities were measured in cattle fed a molasses/urea diet (ad libitum) supplemented with pangola grass hay or barley straw at 0.2, 0.4, 0.6 and 0.8% of bodyweight. Rumen thiaminase activities were extremely low at all times and did not vary with dietary regimen. Two steers fed pangola hay at 0.2% of bodyweight developed symptoms of molasses toxicity but thiaminase activities in the rumen of these steers were not increased. All steers exhibited elevated proportions of butyric acid in rumen fluid.In a second experiment, rumen dilution rates, fermentation patterns and thiaminase activities were measured in the rumens of goats fed pangola hay (ad libitum) or molasses/urea (ad libitum) with or without a forage supplement. Rumen thiaminase activities were not influenced by dietary regimen and were low at all times. Rumen fermentation patterns in goats fed molasses/urea diets were characterised however by elevated proportions of propionic acid. The importance of glucose availability in ruminants fed molasses based diets is discussed.In the first of a subsequent series of experiments utilising the nylon bag technique the degree of colonisation of pangola hay and barley straw by rumen micro-organisms was measured with particular emphasis on the extent of fungal colonisation. Whole stem material supported greater fungal growth than cell wall materials prepared from those grasses. Cystine concentrations however were significantly higher on the cell wall preparations. In general, fungal growth on pangola grass stems was significantly greater than that of barley straw. DM digestibility from the nylon bags could not be related to changes in the degree of colonisation by rumen microbiota.In a subsequent experiment the influence of increasing quantities of molasses supplementation on DM intake, digestion and in sacco microbial growth was measured in steers fed diets of barley straw or pangola hay ad libitum.Molasses significantly reduced intake and digestibility in steers fed barley straw but not pangola. Nylon bag studies revealed that microbial attachment to pangola was significantly greater than barley straw. Whereas increasing levels of molasses supplementation decreased digestion in steers fed barley straw, nylon bag measurements in the rumen of these animals did not support this observation. The depression in intake and digestibility in steers fed barley straw could not be related to depressions in rumen pH or ammonia concentrations.In order to confirm the role of rumen fungi in the digestion of plant fibre, forages were treated with a mixture of sodium chlorite/acetic acid for 48 h. After washing and drying the treated straw was fed to sheep. Within two days the rumen fungi had been eliminated from the animals. Associated with the disappearance of the fungi was an elevation in the proportion of propionic acid in rumen liquor (from ca. 0.15 to 0.30). Subsequent inoculation of sheep with a pure culture of fungus decreased propionate concentrations within 3 days to the levels observed in control animals that possessed abundant fungal populations throughout the experiment. Re-introduction of fungi also resulted in a small but significant increase in overall DM digestibility (46.2 vs. 49.5 P<0.05). However the effect of fungi on DM loss from straw in nylon bags was much more pronounced.Confirmation that propionate itself was not responsible for the elimination of the fungi was provided by the results of a subsequent experiment in which intraruminal infusions of propionic acid failed to reduce fungal growth or prevent recolonization in sheep previously rendered free of fungi." @default.
• W2767657629 created "2017-11-17" @default.
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• W2767657629 date "2017-07-04" @default.
• W2767657629 modified "2023-09-27" @default.
• W2767657629 title "Influence of feed supplements on rumen microbial activity" @default.
• W2767657629 doi "https://doi.org/10.14264/uql.2017.653" @default.
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