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KMID : 1025520200620050638
Journal of Animal Science and Technology
2020 Volume.62 No. 5 p.638 ~ p.647
Substitution effects of rice for corn grain in total mixed ration on rumen fermentation characteristics and microbial community in vitro
Yoo Dae-Kyum

Hamid Muhammad Mahboob Ali
Kim Han-Been
Moon Joon-Beom
Song Jae-Yong
Lee Se-Young
Seo Ja-Kyeom
Abstract
This study determined the substitution effects of rice for corn as the main grain source in a total mixed ration (TMR). In vitro rumen fermentation characteristics and microbes were assessed using two experimental diets. Diets included 33% dry matter (DM) of either corn (Corn TMR) or rice grains (Rice TMR). In a 48-h in vitro incubation, DM digestibility (IVDMD), neutral detergent fiber degradability (IVNDFD), crude protein digestibility (IVCPD), volatile fatty acids (VFAs), pH and ammonia nitrogen (NH3-N) were estimated. Gas production has been calculated at 3, 6, 12, 24 and 48 h. Our results indicate that the gas production, VFAs, IVDMD, and IVNDFD of Rice TMR were higher than those of Corn TMR (p < 0.05). Ruminal pH and total fungi were significantly higher in Corn TMR (p < 0.05) than in Rice TMR; however, NH3-N and IVCPD were not affected by treatment type. In conclusion, substituting rice for corn at 33% DM in TMR appears to have no negative effects on in vitro rumen fermentation characteristics. Therefore, rice grains are an appropriate alternative energy source in early fattening stage diets of beef cattle.
KEYWORD
Rice grains, Corn grains, Total mixed ration, In vitro fermentation
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