EFFECT OF SACCAROMYCES CEREVISIAE SUPPLEMENTATION ON RUMEN CHARACTERISTICS IN AWASSI LAMBS FED DIETS WITH DIFFERENT ROUGHAGE TO CONCENTRATE RATIOS

A. Hassan, S.; F. Mohammed, S.

	EFFECT OF SACCAROMYCES CEREVISIAE SUPPLEMENTATION ON RUMEN CHARACTERISTICS IN AWASSI LAMBS FED DIETS WITH DIFFERENT ROUGHAGE TO CONCENTRATE RATIOS
The Iraqi Journal of Agricultural Science
Article 1, Volume 47, Issue 7, 2016, Pages 1-11
Authors
S. A. Hassan; S. F. Mohammed
Abstract
Thirty two Awassi male lambs with initial body weight(27±1.78 kg), and four to five months old, were allocated into four equal groups in factorial experiment to study the effect of two roughage to concentrate rations (R:C, 60:40 and 40:60) supplemented with two levels of Saccharomyces cerevisiae (0 and 5 g S. cerevisiae / head / day) on rumen fermentations rate[Total volatile fatty acids(TVFA) ,pH and ammonia concentration (NH3-N)] . The diets were offered in quantity to achieve 150 g daily gain .Results shown no differences in daily dry matter intake(DMI) and daily gain across treatments. As well as no significant effect for R: C ratio on TVFA and pH whereas, propionic, butyric acids and NH3-N increased significantly (P<0.05) with high concentrate diets, but the molar proportion of acetic significantly (P<0.05) decreased with high levels of concentrate diets. S cerevisiae supplementation showed significantly (P<0.05) increased in TVFA, propionic and butyric acid, whereas, significantly (P<0.05) decreased acetic acid and NH3-N. Significant(P<0.05) interaction were shown between high level of concentrate and S cerevisiae supplementation in TVFA, propionic, butyric acid ,acetic acid and NH3-N whereas, no significant effect on pH .In conclusion ,S cerevisiae supplementation to high concentrate diet significantly (P<0.05) increased TVFA, propionic and butyric acid, whereas, significantly (P<0.05) decreased acetic acid and NH3-N .
Keywords
lambs; cerevisiae; Roughage to Concentrate Ratios; rumen characteristics

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