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. 2019 Dec 12;9(12):1136. doi: 10.3390/ani9121136

Figure 2.

Figure 2

Average number of visits to the GreenFeed systems for all heifers (bar graph) and average CH4 emission rate for Galle heifers (empty) and Borculo heifers (colored filling) over 23 h starting at 9:00 when the heifers were freed. The troughs were filled with roughage (green arrow) at 8:00.