Description of two anaerobic fungal strains from the bovine rumen and influence of diet on the fungal population in vivo
1991
Kostyukovsky, V.A. | Okunev, O.N. | Tarakanov, B.V.
Neocallimastix sp. NC71 and Piromyces sp. PC12 isolated from the calf rumen grew optimally at 39 degrees C and pH 6-5-6-7, utilized a wide range of mono-, oligo- and polysaccharides and exhibited CMCase, Avicelase, cellobiase, amylase and xylanase activities. The end-products of wheat straw fermentation by both strains were acetate, formate, ethanol and lactate. The number of Neocallimastix sp. zoospores in the rumen of cows in the first 3 h after feeding with hay-silage-concentrate diets varied from 7 X 10(3) to 5.4 X 10(5) ml-1; the number of uniflagellate zoospores varied from 10(4) to 10(5) ml-1. Fungal zoosporogenesis and colonization of plant substrates in the rumen were induced by feed intake and were favoured by increased levels of crude fibre in the diet.
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