Effects of Steam-Flaked Corn on Rumen Fermentation Parameters and Methane Emission of Yak in Vitro

LIU Ying; HAO Lizhuang; LIU Shujie

doi:10.3969/j.issn.1006-267x.2020.08.050

Chinese Journal of Animal Nutrition >

2020 , Vol. 32 >Issue 8: 3917 - 3926

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.08.050

Effects of Steam-Flaked Corn on Rumen Fermentation Parameters and Methane Emission of Yak in Vitro

LIU Ying ,
HAO Lizhuang ,
LIU Shujie

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Qinghai Plateau Yak Research Center, State Key Laboratory of Plateau Ecology and Agriculture, Key Laboratory of Plateau Grazing Animal Nutrition and Feed Science of Qinghai Province, Qinghai Academy of Science and Veterinary Medicine of Qinghai University, Xining 810016, China

Received date: 2020-02-20

Online published: 2020-08-13

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Abstract

The objective of this experiment was to study the effects of the replacement ratio of steam-flaked corn in diets on rumen fermentation parameters and methane (CH₄) emission of yak by in vitro gas production technique. The ratio of concentrate to forage of the cultivation substrates was 7:3. The trial has adopted one-factor completely random design. Replacing the corn content in concentrate with steam-flaked corn and 0 (control group), 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100%, and there were 3 replicates in each group. The 48 h gas production, CH₄ proportion in gas, pH, volatile fatty acids (VFA) and ammoniacal nitrogen (NH₃-N) contents were measured. The results showed as follows:1)24 and 48 h total gas production, gas rate, dry matter degradation rate (DMD) showed a linearly raised trend with the replacement ratio of steam-flaked corn increased, and 100% steam-flaked corn group was significantly higher than control group (P<0.05); TVFA and propionic acid contents in 100% steam-flaked corn group significantly increased (P<0.05), acetic acid content and acetic acid/propionic acid and NH₃-N content significantly decreased (P<0.05), and there was no effect on pH (P>0.05). 2) CH₄ production showed a linearly decreased trend with the replacement ratio of steam-flaked corn increased. Compared with the control group, 100% steam-flaked corn group significantly decreased the CH₄ production (P<0.05). The results indicate that 100% steam-flaked corn replacement can significantly decrease CH₄ production, improve the TVFA content of the stomach fluid, reduce the acetic acid/propionic acid, and has a better fermentation effect.

Key words： steam-flaked corn; rumen fermentation; yak; methane

Cite this article

LIU Ying , HAO Lizhuang , LIU Shujie . Effects of Steam-Flaked Corn on Rumen Fermentation Parameters and Methane Emission of Yak in Vitro[J]. Chinese Journal of Animal Nutrition, 2020 , 32(8) : 3917 -3926 . DOI: 10.3969/j.issn.1006-267x.2020.08.050

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