Hammond K. J., Burke J. L., Koolard J. P., Muetzel S., Pinares-Patiño C. S., Waghorn G. C. 2013. Effects of feed intake on enteric methane emissions from sheep fed fresh white clover (Trifolium repens) and perennial ryegrass (Lolium perenne) forages. Animal Feed Science and Technology, 179, 121-132.
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