<p>Sun X. Z., Hoskin S. O., Zhang G. G., Molano G.,&nbsp;Muetzel S., Pinares-Pati&ntilde;o C. S., Clark H., Pacheco, D. 2012. Sheep fed forage chicory (Cichorium intybus)&nbsp;or perennial ryegrass (Lolium perenne) have similar&nbsp;methane emissions. Animal Feed Science and Technology, 172, 217-225.&nbsp;</p>
<p><strong><a href="https://doi.org/10.1016/j.anifeedsci.2011.11.007">Read more</a></strong> (external link)</p>