Journal article

Methane emissions from dairy cows measured using the sulfur hexafluoride (SF6) tracer and chamber techniques

C Grainger, T Clarke, SM McGinn, MJ Auldist, KA Beauchemin, MC Hannah, GC Waghorn, H Clark, RJ Eckard

JOURNAL OF DAIRY SCIENCE | AMER DAIRY SCIENCE ASSOC | Published : 2007

Abstract

Our study compared methane (CH4) emissions from lactating dairy cows measured using the sulfur hexafluoride (SF6) tracer and open-circuit respiration chamber techniques. The study was conducted using 16 lactating Holstein-Friesian cows. In each chamber, the cow was fitted with the SF6 tracer apparatus to measure total CH4 emissions, including emissions from the rectum. Fresh ryegrass pasture was harvested daily and fed ad libitum to each cow with a supplement of 5 kg of grain/d. The CH4 emissions measured using the SF6 tracer technique were similar to those using the chamber technique: 331 vs. 322 g of CH4/d per cow. The accuracy of the SF6 tracer technique was indicated by considering the r..

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