Nutrient Digestibility and Greenhouse Gas Emission in Castrated Goats (Capra hircus) Fed Various Roughage Sources
2018
Na, Y., Konkuk University, Seoul, Republic of Korea | Hwang, S., Konkuk University, Seoul, Republic of Korea | Choi, Y., Konkuk University, Seoul, Republic of Korea | Park, G., Konkuk University, Seoul, Republic of Korea | Lee, S., Konkuk University, Seoul, Republic of Korea
The objective of this study was to determine the effect of various roughage sources on nutrient digestibility and enteric methane (CH₄), and carbon dioxide (CO₂) production in goats. Four castrated black goats (48.5 ± 0.6 kg) were individually housed in environmentally controlled respiration-metabolism chambers. The experiment design was a 4 × 4 balanced Latin square design with 4 roughage types and 4 periods. Alfalfa, tall fescue, rice straw, and corn silage was used as representative of legume, grass, straw, and silage, respectively. Dry matter digestibility was higher (p less than 0.001) in corn silage than in alfalfa hay. Dry matter digestibility of alfalfa hay was higher than those of tall fescue or rice straw (p less than 0.001). Neutral detergent fiber digestibility of tall fescue was lower (p less than 0.001) than those of alfalfa, rice straw, or corn silage. Daily enteric CH4 production and the daily enteric CH₄ production per kilogram of BW0.75, dry matter intake (DMI), organic matter intake (OMI), digested DMI, and digested OMI of rice straw did not differ from those of tall fescue but were higher (p less than 0.001) than those of alfalfa or corn silage. Roughage type had no effect on enteric CO₂ emission in goats. Straw appeared to generate more enteric CH4 production than legume or silage, but similar to grass.
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