Effect of yeast culture on rumen fermentation, microbial protein flow from the rumen and live-weight gain in bulls given high cereal diets

Abstract

El Hassan, S. M., Newbold, C. J., Edwards, I. E., Topps, J. H., Wallace, R. J. (1996). Effect of yeast culture on rumen fermentation, microbial protein flow from the rumen and live-weight gain in bulls given high cereal diets. Animal Science, 62 (1), 43-48.Four groups each of eight Limousin X Friesian bulls, average weight 344 kg, were offered individually ad libitum diets comprising: 920 g rolled barley, 50 g cane molasses, 15 g urea and 15 g minerals/vitamins mix per kg or 867 . 5 g rolled barley, 50 g cane molasses, 7 . 5 g urea, 60 g soya-bean meal and 15 g minerals/vitamins mix per kg, plus or minus yeast culture (YC, 1 . 5 kg/t) (all weights fresh weights), until slaughter (460 kg). Rumen samples were obtained by stomach tube. YC decreased rumen ammonia concentrations (116 . 7, 56 . 0, 74 . 3, 45 . 7 (s.e.d. 19 . 40) mg/l for barley/urea, barley/urea/YC, barley/soya-bean meal and barley/soya-bean meal/YC, respectively). This was associated with increases (P <0 . 05) in both the total number of bacteria (2 . 3, 4 . 2, 3 . 5, 6 . 8 (s.e.d. 1 . 06) X 10(9) per ml, respectively) and the protein content of rumen fluid (7 . 7, 9 . 6, 8 . 7, 9 . 0 (s.e.d. 0 . 59) g/l, respectively). However, the flow of microbial protein from the rumen as estimated from the appearance of purine derivatives in the urine was unaffected (131, 130, 129, 147 (s.e.d. 12 . 6) g N per day, respectively). Thus although the animals responded to the undegradable rumen protein supplied by the soya-bean meal there was no significant response in live-weight gain with YC (1 . 28, 1 . 31, 1 . 42, 1 . 48 (s.e.d. 0 . 081) kg/day, respectively).Peer reviewe

Growth and carcass characteristics of male dairy calves on a yeast culture-supplemented diet

“…Our results are in accordance with those of other workers who found that supplementing yeast culture had no effect on the growth rate of intensively fed bulls (Mutsvangwa et al, 1992;El Hassan et al, 1996;Beauchemin et al, 2003), grazing steers (Cabrera et al, 2000) or lambs (Kawas et al, 2007). Others reported that yeast culture tended to reduce the average daily gain of steers (Mir & Mir, 1994) while Wehner et al (1998) found that yeast-fed calves tended to gain more than the control calves.…”

“…These results are in contrast with those of other workers, who found that the addition of yeast culture to the diet of feeder calves and lambs resulted in a non-significant increase in feed consumption (Andrighetto et al, 1993), or found no differences in feed intake with yeast-treated lambs (Kawas et al, 2007), steers (Cabrera et al, 2000) or feedlot cattle (Beauchemin et al, 2003). However, other studies reported that yeast culture supplementation resulted in increased dry matter intakes of feeder calves (Cole et al, 1992), steers and bulls (Mutsvangwa et al, 1992;Andrighetto et al, 1993;Mir & Mir, 1994;Olson et al, 1994;El Hassan et al, 1996). (Olson et al, 1994;Wohlt et al, 1998).…”

The effect of dietary yeast and protected methionine on performance and trace minerals status of growing Awassi lambs

“…ruminant (Wallace and Newbold, 1993). Increased microbial protein flow to the small intestine might be reported to stimulate productivity, particularly in animals given a cereal-based diet without added protein supplement (El Hassan et al, 1996).…”

Changes in the microbial population of a rumen-simulating fermenter in response to yeast culture

“…Although several studies have described increases in total viable counts (Wiedmeier et al 1987;Harrison et al 1988;Newbold et al 1995), fewer have addressed the question of whether the increased bacterial count resulted from an increase in bacterial biomass or an increase in the proportion of viable bacteria without a change in biomass. In only one study has yeast culture been reported to increase the microscopic count of bacteria as well as the viable count (Kumar et al 1994) whereas others found no increase in microbial protein leaving the rumen even when yeast stimulated the culturable count of bacteria in rumen fluid (El Hassan et al 1996).…”