Methane emissions of low and high methane yield selection line sheep fed ryegrass-based pasture across multiple periods

<p dir="ltr">There is a lack of information on actual CH₄ emissions from low and high CH₄ selection line sheep-fed pasture ad libitum across different periods of the year. The objective of the two experiments was to determine the CH₄ emissions in respiration chambers from low and high CH₄ yield selection line sheep while fed cut pasture ad libitum across multiple measurement periods. In both experiments, CH₄ yield was consistently less in low compared to high CH₄ yield selection line sheep being, respectively, 8.9, 8.4 and 9.7 % less in periods 1 to 3 in Exp. 1 and 7.6, 9.6, 7.7 and 8.9% less in periods 1 to 4 in Exp. 2. These results indicate that the magnitude of CH₄ yield differences between selection lines is consistent across different periods of the year.</p>