<p>Sun X. Z., Sandoval E., Pacheco D. 2015. Brief Communication: Substitution of perennial ryegrass&nbsp;with forage rape reduces methane emissions from sheep. Proceedings of the New Zealand Society of Animal Production 2015, 75, 64-66.</p>
<p><strong><a href="http://www.nzsap.org/proceedings/2015/brief-communication-substitution-perennial-ryegrass-forage-rape-reduces-methane">Read more </a></strong>(external link)&nbsp;</p>