Journal
VETERINARY SCIENCES
Volume 8, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/vetsci8120294
Keywords
fattening steers; growth performance; rumen ecology; yeast
Categories
Funding
- Nakhon Phanom University Fund through the middle-class researcher scholarships [MR3/2563]
- Research Program on the Research and Development of Winged Bean Root Utilization as Ruminant Feed
- Increase Production Efficiency and Meat Quality of Native Beef and Buffalo Research Group
- Research and Graduate Studies, Khon Kaen University (KKU)
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The addition of dry yeast (DY) to fattening steers with a high concentrate diet improved feed intake, nutrient digestibility, rumen ecology, and growth performance, while mitigating ruminal methane production.
The effect of dry yeast (DY) (Saccharomyces cerevisiae) supplementation in a high-concentrate diet was evaluated for rumen fermentation, blood parameters, microbial populations, and growth performance in fattening steers. Sixteen crossbred steers (Charolais x American Brahman) at 375 +/- 25 kg live weight were divided into four groups that received DY supplementation at 0, 5, 10, and 15 g/hd/d using a completely randomized block design. Basal diets were fed as a total mixed ration (roughage to concentrate ratio of 30:70). Results showed that supplementation with DY improved dry matter (DM) intake and digestibility of organic matter (OM), neutral detergent fiber (NDF), and acid detergent fiber (ADF) (p < 0.05), but DM and crude protein (CP) were similar among treatments (p > 0.05). Ruminal pH (>6.0) of fattening steer remained stable (p > 0.05), and pH was maintained at or above 6.0 with DY. The concentration of propionic acid (C-3) increased (p < 0.05) with 10 and 15 g/hd/d DY supplementation, while acetic acid (C-2) and butyric acid (C-4) decreased. Methane (CH4) production in the rumen decreased as DY increased (p < 0.05). Fibrobacter succinogenes and Ruminococcus flavefaciens populations increased (p < 0.05), whereas protozoal and methanogen populations decreased with DY addition at 10 and 15 g/hd/d, while Ruminococcus albus did not change (p > 0.05) among the treatments. Adding DY at 10 and 15 g/hd/d improved growth performance. Thus, the addition of DY to fattening steers with a high concentrate diet improved feed intake, nutrient digestibility, rumen ecology, and growth performance, while mitigating ruminal methane production.
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