. 2021 Oct 9;7(4):1371–1387. doi: 10.1016/j.aninu.2021.10.003

Table 6.

In vivo studies of methane (CH₄) emissions from seaweed and commercial bromochloromethane (BCM) supplementation.

Animal	Basal diet	Treatment	DMI, kg/d	CH₄ production	Reference¹
Beef steers	Feedlot TMR (total mixed ration)	BCM, g/100 kg of BW		CH₄, g/kg DMI	1
		0 (control)	6.2^b	8.7^a
		0.15	7.4^a	3.8^ab
		0.30	5.6^b	1.4^b
		0.60	5.5^b	0.8^b
	Rate of change, %		−11.3	−95.2
Beef steers	Alfalfa hay	BCM, g/100 kg of BW		CH₄, mL/min	2
		0 (control)	8.1^a	205.5^a
		1.2	7.5^b	0.24^b
	Rate of change, %		−7.4	−90.6
Beef steers	Feedlot TMR	BCM, g/100 kg of BW		CH₄, g/kg DMI	3
		0 (control)	10.4	20.0^a
		0.98	10.3	0.1^b
	Rate of change, %		−0.96	−99.5
Dairy cows	Dairy TMR	A. armata, %, OM basis		CH₄, g/kg DMI	4
		0 (control)	27.9^a	15.0^a
		0.5	24.9^b	12.0^b
		1.0	17.3^c	7.5^b
	Rate of change, %		−38.0	−50.0
Beef steers	Feedlot TMR	A. taxiformis, %, OM basis		CH₄, g/kg DMI	5
		0 (control)	8.4	10.4
		0.05%	8.0	10.0
		0.10%	10.3	6.2
		0.2%	8.8	0.2
	Rate of change, %		0.4	−98.0
Sheep	High-fiber pellet	A. taxiformis, %, OM basis		CH₄, g/kg DMI	6
		0 (control)	1.0	15.0^a
		0.5	1.1	12.7^ab
		1.0	1.0	7.0^b
		2.0	1.1	5.6^c
		3.0	1.0	2.9^c
	Rate of change, %		0.0	−80.7
Sheep	Feedlot TMR	BCM, g/100 kg of BW		CH₄, % of GE intake	7
		0 (control)	1.0	6.1^a
		0.15	1.0	1.0^b
		0.3	1.0	0.9^b
		0.45	1.0	0.8^b
	Rate of change, %		0.0	−86.9
Dairy goats	Alfalfa + concentrate	BCM, g/100 kg of BW		CH₄, g/kg DMI	8
		0 (control)	0.99	29.95
		0.3	1.04	19.9
	Rate of change, %		0.5	−33.6

DMI = dry matter intake; TMR = total mixed ration; A. armata = Asparagopsis armata; A. taxiformis = Asparagopsis taxiformis; GE = gross energy.

^{a, b, c} Values in a column with different superscript letters were significantly different (P < 0.05).