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Paper Information

Journal:   IRANIAN JOURNAL OF AGRICULTURAL SCIENCES (JOURNAL OF AGRICULTURE)   2008 , Volume 39 , Number 2; Page(s) 337 To 344.
 
Paper: 

THE EFFECT OF SACCHAROMYCES CEREVISIAE (SC 47) ON RUMEN DIGESTION, FERMENTATION AND PROTOZOA POPULATION IN BULLS FED WITH TWO SOURCES OF FORAGE

 
 
Author(s):  GHASEMI EBRAHIM*, NIKKHAH A., KAFILZADEH FAROKH
 
* UNIVERSITY COLLEGE OF AGRICULTURE & NATURAL RESOURCES, UNIVERSITY OF TEHRAN
 
Abstract: 
The objective of this study was to determine the effect of Saccharomyces cerevisiae on utilization of two different forages and the subsequent changes in rumen environment. Four fistulated bulls fed at maintenance level were employed in a lat in square design with 2x2 factorial arrangements of treatments (alfalfa hay or com silage with 0 or 5 g/d of S. cerevisiae) in four experimental periods. In situ dry matter degradation of forages was increased by addition of S. cerevisiae at 3 hs of incubation (P < 0.1). Crude protein disappearance of forages, daily pH, and total volatile fatty acids concentration were not affected by supplementation of S. cerevisiae (P > 0.1). Mean daily concentration of ruminal ammonia-N decreased by addition of S. cerevisiae (P < 0.1). Addition of S. cerevisiae increased molar percentage of propionate and decreased acetate to propionate ratio (P < 0.1) but no effect was observed for molar percentages of acetate and butyrate (P > 0.1). There were interactions between S. cerevisiae and the diets for acetate, propionate and acetate to propionate ratio. For alfalfa hay based diet, acetate to propionate ratio decreased while for com silage based diet it was increased through an addition of S. cerevisiae (P < 0.05). Total protozoa counts decreased in diets supplemented with S. cerevisiae at 3 and 12 h (P < 0.1) but no effect was found at the 0 and 6 h post feeding (P > 0.1). The results indicated that S. cerevisiae slightly affected most rumen parameters and could increase efficiency through improving initial digestibility, even though these responses were not, to a large extent, significant.
 
Keyword(s): SACCHAROMYCES CEREVISIAE, RUMEN, DIGESTION, FERMENTATION, PROTOZOA
 
References: 
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