The effect of monensin on the fermentation of feed with different hay and concentrate proportions studied by the rumen simulation technique (RUSITEC)
1991
Jalc, D. | Baran, M. | Vendrak, T. | Siroka, P. (Slovenska Akademia Vied, Kosice (CSFR). Ustav Fyziologie Hospodarskych Zvierat)
An experiment was conducted with rumen simulation technique (RUSITEC). In four fermentation vessels (V), percent proportions of hay and barley were as follows: V1-40:60, V2-60:40, V3-80:20 and V4-100:0. Every day 5 mg of monensin dissolved in 1 ml 96 per cent ethanol were added to each fermentation vessel. All diets were isonitrogenous, and after an addition of urea the crude protein (CP) content made 13 per cent in each diet. The experiment lasted 12 days: so called steady state period took the first six days when the fermentation conditions were stabilized. Monensin reduced dry matter digestibility, production of total volatile fatty acids, acetic acid, n-butyric and isovaleric acids and acetate : propionate proportion, and it increased the production of propionic and n-valeric acids. The production of methane and CO2 decreased. The higher proportion of hay in diets decreased dry matter digestibility, digestibility of detergent fibre, total and individual volatile fatty acids, CO2, methane energy yield of volatile fatty acids (E), glucose utilization, production of adenosine triphosphate and production of fermented hexoses. The production, utilization and recovery of metabolic hydrogen also decreased. The effectiveness of microbial matter synthesis was highest during the fermentation of feed containing 60 per cent hay and 40 per cent barley.
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