Greenfeed - Revision history

Bgolden at 10:47, 2 May 2025

2025-05-02T10:47:44Z

← Older revision		Revision as of 10:47, 2 May 2025
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			<b>NOTE: This version of Section 20 has been approved by the working group's Chair. Please be aware that further revisions may occur before final review and approval by the Board and ICAR members per the [[Approval of Page Process]].
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	GreenFeed (C-Lock Inc., Rapid City, South Dakota, USA) is a sniffer system where breath samples are provided when animals visit a bait station (Huhtanen et al., 2015<ref name=":0">Huhtanen, P., Cabezas-Garcia, E.H., Utsumi, S., and Zimmerman, S. 2015. Comparison of methods to determine methane emissions from dairy cows in farm conditions. J. Dairy Sci. 98:3394–3409. doi:10.3168/jds.2014-9118.</ref>). GreenFeed Emission Monitoring (GEM) systems are designed for measuring animal emissions in their production environment. As with other sniffer systems, GreenFeed samples breath from individual animals several times (in general 4 to 6 times) per day for short periods (3 to 7 minutes in which an under pressure is created to suck the whole breath of the animal to measure the flux). A minimum air flow of 27 L/min is needed to ensure the entire breath of the cow is captured. If air flow is below this threshold value, the emission rate will be underestimated (McGinn et al, 2021<ref>McGinn, Sean & Coulombe, Jean-Franҫois & Beauchemin, Karen. (2021). Technical Note: Validation of the GreenFeed System for measuring enteric gas emissions from cattle. Journal of Animal Science. 99. 10.1093/jas/skab046.</ref>). Generally the flow is set at 40 L/min. They record CH<sub>4</sub> and carbon dioxide (CO<sub>2</sub>) fluxes during short-term periods of 3-10 minutes when cattle visit an automated feeder fitted with a semi-enclosed head hood in which air is continuously drawn through an air-collection pipe (C-Lock, 2016<ref>C-Lock, 2016. <nowiki>https://www.c-lockinc.com/</nowiki></ref>; Huhtanen et al., 2015<ref name=":0" />; Hammond et al., 2016A<ref>Hammond, K.J., Crompton, L.A., Bannink, A., Dijkstra, J., Yáñez-Ruiz, D.R., O’Kiely, P., Kebreab, E., Eugenè, M.A., Yu, Z., Shingfield, K.J., Schwarm, A., Hristov, A.N., and Reynolds, C.K. 2016A. Review of current in vivo measurement techniques for quantifying enteric methane emission from ruminants. Anim. Feed Sci. Technol. 219:13–30. doi:10.1016/j.anifeedsci.2016.05.018.</ref>; Velazco et al., 2016<ref>Velazco, J. I., Hegarty, R., Cottle, D., and Li, L. 2016. Quantifying daily methane production of beef cattle from multiple short-term measures using the GreenFeed system. <nowiki>https://rune.une.edu.au/web/handle/1959.11/23580</nowiki>.</ref>). Air samples are continually (every second) analyzed for CH<sub>4</sub> concentrations, using a tunable diode laser since 2018, and CO<sub>2</sub> concentrations using a non-dispersive infrared sensor. Gas fluxes are eventually calculated as the product of the air flow in the collection pipe and the concentration of gases corrected for the background concentrations and adjusted to standardized temperature, humidity and pressure. The position of the head in the feeder is detected by an infrared sensor. Gas fluxes are not calculated if the head is not correctly positioned in the feeder as not all the air in the feeder may be collected.		GreenFeed (C-Lock Inc., Rapid City, South Dakota, USA) is a sniffer system where breath samples are provided when animals visit a bait station (Huhtanen et al., 2015<ref name=":0">Huhtanen, P., Cabezas-Garcia, E.H., Utsumi, S., and Zimmerman, S. 2015. Comparison of methods to determine methane emissions from dairy cows in farm conditions. J. Dairy Sci. 98:3394–3409. doi:10.3168/jds.2014-9118.</ref>). GreenFeed Emission Monitoring (GEM) systems are designed for measuring animal emissions in their production environment. As with other sniffer systems, GreenFeed samples breath from individual animals several times (in general 4 to 6 times) per day for short periods (3 to 7 minutes in which an under pressure is created to suck the whole breath of the animal to measure the flux). A minimum air flow of 27 L/min is needed to ensure the entire breath of the cow is captured. If air flow is below this threshold value, the emission rate will be underestimated (McGinn et al, 2021<ref>McGinn, Sean & Coulombe, Jean-Franҫois & Beauchemin, Karen. (2021). Technical Note: Validation of the GreenFeed System for measuring enteric gas emissions from cattle. Journal of Animal Science. 99. 10.1093/jas/skab046.</ref>). Generally the flow is set at 40 L/min. They record CH<sub>4</sub> and carbon dioxide (CO<sub>2</sub>) fluxes during short-term periods of 3-10 minutes when cattle visit an automated feeder fitted with a semi-enclosed head hood in which air is continuously drawn through an air-collection pipe (C-Lock, 2016<ref>C-Lock, 2016. <nowiki>https://www.c-lockinc.com/</nowiki></ref>; Huhtanen et al., 2015<ref name=":0" />; Hammond et al., 2016A<ref>Hammond, K.J., Crompton, L.A., Bannink, A., Dijkstra, J., Yáñez-Ruiz, D.R., O’Kiely, P., Kebreab, E., Eugenè, M.A., Yu, Z., Shingfield, K.J., Schwarm, A., Hristov, A.N., and Reynolds, C.K. 2016A. Review of current in vivo measurement techniques for quantifying enteric methane emission from ruminants. Anim. Feed Sci. Technol. 219:13–30. doi:10.1016/j.anifeedsci.2016.05.018.</ref>; Velazco et al., 2016<ref>Velazco, J. I., Hegarty, R., Cottle, D., and Li, L. 2016. Quantifying daily methane production of beef cattle from multiple short-term measures using the GreenFeed system. <nowiki>https://rune.une.edu.au/web/handle/1959.11/23580</nowiki>.</ref>). Air samples are continually (every second) analyzed for CH<sub>4</sub> concentrations, using a tunable diode laser since 2018, and CO<sub>2</sub> concentrations using a non-dispersive infrared sensor. Gas fluxes are eventually calculated as the product of the air flow in the collection pipe and the concentration of gases corrected for the background concentrations and adjusted to standardized temperature, humidity and pressure. The position of the head in the feeder is detected by an infrared sensor. Gas fluxes are not calculated if the head is not correctly positioned in the feeder as not all the air in the feeder may be collected.

	GreenFeed is a portable standalone system used in barn and pasture applications and incorporates an extractor fan to ensure active airflow and head position sensing for representative breath sampling (Hammond et al., 2016B<ref>Hammond, K.J., Jones, A.K., Humphries, D.J., Crompton, L.A., and Reynolds, C.K. 2016B. Effects of diet forage source and neutral detergent fiber content on milk production of dairy cattle and methane emissions determined using GreenFeed and respiration chamber techniques. J. Dairy Sci. 99:7904–7917. doi:10.3168/jds.2015-10759.</ref>). Measurements are pre-processed by the manufacturer, and data are available in real-time through a web-based data management system (Hammond et al., 2015<ref name=":1">Hammond, K.J., Humphries, D.J., Crompton, L.A., Green, C., and Reynolds, C.K. 2015. Methane emissions from cattle: Estimates from short-term measurements using a GreenFeed system compared with measurements obtained using respiration chambers or sulphur hexafluoride tracer. Anim. Feed Sci. Technol. 203:41-52. doi:10.1016/j.anifeedsci.2015.02.008.</ref>). A year-long service contract with C-Lock is required for a functional GreenFeed. Because GreenFeed captures a high proportion of emitted air and measures airflow, which can be calibrated using a tracer gas, CH<sub>4</sub> emission is estimated as a flux at each visit. Providing visits occur throughout the 24 hours, CH<sub>4</sub> emission can be estimated directly as g/day (Hammond et al., 2015<ref name=":1" />; Huhtanen et al., 2015<ref name=":0" />). More importantly, repeatability of CH<sub>4</sub> measurement must be high so the duration of the measurement period must be taken into account (Huhtanen et al., 2015<ref name=":0" />; Arbre et al., 2016<ref name=":2">Arbre, M., Rochette, Y., Guyader, J., Lascoux, C., Gómez, L.M., Eugène, M., Morgavi, D.P., Renand, G., Doreau, M. and Martin, C. 2016. Repeatability of enteric methane determinations from cattle using either the SF6 tracer technique or the GreenFeed system. Anim. Prod. Sci. 56:238-243.</ref>); (r=0.7 after 17 days duration of measurement period, or r=0.93 after 45 days, Arbre et al., 2016<ref name=":2" />).		GreenFeed is a portable standalone system used in barn and pasture applications and incorporates an extractor fan to ensure active airflow and head position sensing for representative breath sampling (Hammond et al., 2016B<ref>Hammond, K.J., Jones, A.K., Humphries, D.J., Crompton, L.A., and Reynolds, C.K. 2016B. Effects of diet forage source and neutral detergent fiber content on milk production of dairy cattle and methane emissions determined using GreenFeed and respiration chamber techniques. J. Dairy Sci. 99:7904–7917. doi:10.3168/jds.2015-10759.</ref>). Measurements are pre-processed by the manufacturer, and data are available in real-time through a web-based data management system (Hammond et al., 2015<ref name=":1">Hammond, K.J., Humphries, D.J., Crompton, L.A., Green, C., and Reynolds, C.K. 2015. Methane emissions from cattle: Estimates from short-term measurements using a GreenFeed system compared with measurements obtained using respiration chambers or sulphur hexafluoride tracer. Anim. Feed Sci. Technol. 203:41-52. doi:10.1016/j.anifeedsci.2015.02.008.</ref>). A year-long service contract with C-Lock is required for a functional GreenFeed. Because GreenFeed captures a high proportion of emitted air and measures airflow, which can be calibrated using a tracer gas, CH<sub>4</sub> emission is estimated as a flux at each visit. Providing visits occur throughout the 24 hours, CH<sub>4</sub> emission can be estimated directly as g/day (Hammond et al., 2015<ref name=":1" />; Huhtanen et al., 2015<ref name=":0" />). More importantly, repeatability of CH<sub>4</sub> measurement must be high so the duration of the measurement period must be taken into account (Huhtanen et al., 2015<ref name=":0" />; Arbre et al., 2016<ref name=":2">Arbre, M., Rochette, Y., Guyader, J., Lascoux, C., Gómez, L.M., Eugène, M., Morgavi, D.P., Renand, G., Doreau, M. and Martin, C. 2016. Repeatability of enteric methane determinations from cattle using either the SF6 tracer technique or the GreenFeed system. Anim. Prod. Sci. 56:238-243.</ref>); (r=0.7 after 17 days duration of measurement period, or r=0.93 after 45 days, Arbre et al., 2016<ref name=":2" />).
	<references />		<references />

Cvangemert at 12:25, 19 February 2025

2025-02-19T12:25:42Z

← Older revision		Revision as of 12:25, 19 February 2025
Line 1:		Line 1:
	GreenFeed (C-Lock Inc., Rapid City, South Dakota, USA) is a sniffer system where breath samples are provided when animals visit a bait station (Huhtanen et al., 2015<ref name=":0">Huhtanen, P., Cabezas-Garcia, E.H., Utsumi, S., and Zimmerman, S. 2015. Comparison of methods to determine methane emissions from dairy cows in farm conditions. J. Dairy Sci. 98:3394–3409. doi:10.3168/jds.2014-9118.</ref>). GreenFeed Emission Monitoring (GEM) systems are designed for measuring animal emissions in their production environment. As with other sniffer systems, GreenFeed samples breath from individual animals several times (in general 4 to 6 times) per day for short periods (3 to 7 minutes in which an under pressure is created to suck the whole breath of the animal to measure the flux). They record CH<sub>4</sub> and carbon dioxide (CO<sub>2</sub>) fluxes during short-term periods of 3-10 minutes when cattle visit an automated feeder fitted with a semi-enclosed head hood in which air is continuously drawn through an air-collection pipe (C-Lock, 2016<ref>C-Lock, 2016. <nowiki>https://www.c-lockinc.com/</nowiki></ref>; Huhtanen et al., 2015<ref name=":0" />; Hammond et al., 2016A<ref>Hammond, K.J., Crompton, L.A., Bannink, A., Dijkstra, J., Yáñez-Ruiz, D.R., O’Kiely, P., Kebreab, E., Eugenè, M.A., Yu, Z., Shingfield, K.J., Schwarm, A., Hristov, A.N., and Reynolds, C.K. 2016A. Review of current in vivo measurement techniques for quantifying enteric methane emission from ruminants. Anim. Feed Sci. Technol. 219:13–30. doi:10.1016/j.anifeedsci.2016.05.018.</ref>; Velazco et al., 2016<ref>Velazco, J. I., Hegarty, R., Cottle, D., and Li, L. 2016. Quantifying daily methane production of beef cattle from multiple short-term measures using the GreenFeed system. <nowiki>https://rune.une.edu.au/web/handle/1959.11/23580</nowiki>.</ref>). Air samples are continually (every second) analyzed for CH<sub>4</sub> and CO<sub>2</sub> concentrations using non-dispersive infrared ~~sensors~~. Gas fluxes are eventually calculated as the product of the air flow in the collection pipe and the concentration of gases corrected for the background concentrations and adjusted to standardized temperature, humidity and pressure. The position of the head in the feeder is detected by an infrared sensor. Gas fluxes are not calculated if the head is not correctly positioned in the feeder as not all the air in the feeder may be collected. GreenFeed is a portable standalone system used in barn and pasture applications and incorporates an extractor fan to ensure active airflow and head position sensing for representative breath sampling (Hammond et al., 2016B<ref>Hammond, K.J., Jones, A.K., Humphries, D.J., Crompton, L.A., and Reynolds, C.K. 2016B. Effects of diet forage source and neutral detergent fiber content on milk production of dairy cattle and methane emissions determined using GreenFeed and respiration chamber techniques. J. Dairy Sci. 99:7904–7917. doi:10.3168/jds.2015-10759.</ref>). Measurements are pre-processed by the manufacturer, and data are available in real-time through a web-based data management system (Hammond et al., 2015<ref name=":1">Hammond, K.J., Humphries, D.J., Crompton, L.A., Green, C., and Reynolds, C.K. 2015. Methane emissions from cattle: Estimates from short-term measurements using a GreenFeed system compared with measurements obtained using respiration chambers or sulphur hexafluoride tracer. Anim. Feed Sci. Technol. 203:41-52. doi:10.1016/j.anifeedsci.2015.02.008.</ref>). Because GreenFeed captures a high proportion of emitted air and measures airflow, which can be calibrated using a tracer gas, CH<sub>4</sub> emission is estimated as a flux at each visit. Providing visits occur throughout the 24 hours, CH<sub>4</sub> emission can be estimated directly as g/day (Hammond et al., 2015<ref name=":1" />; Huhtanen et al., 2015<ref name=":0" />). More importantly, repeatability of CH<sub>4</sub> measurement must be high so the duration of the measurement period must be taken into account (Huhtanen et al., 2015<ref name=":0" />; Arbre et al., 2016<ref name=":2">Arbre, M., Rochette, Y., Guyader, J., Lascoux, C., Gómez, L.M., Eugène, M., Morgavi, D.P., Renand, G., Doreau, M. and Martin, C. 2016. Repeatability of enteric methane determinations from cattle using either the SF6 tracer technique or the GreenFeed system. Anim. Prod. Sci. 56:238-243.</ref>); (r=0.7 after 17 days duration of measurement period, or r=0.93 after 45 days, Arbre et al., 2016<ref name=":2" />).		GreenFeed (C-Lock Inc., Rapid City, South Dakota, USA) is a sniffer system where breath samples are provided when animals visit a bait station (Huhtanen et al., 2015<ref name=":0">Huhtanen, P., Cabezas-Garcia, E.H., Utsumi, S., and Zimmerman, S. 2015. Comparison of methods to determine methane emissions from dairy cows in farm conditions. J. Dairy Sci. 98:3394–3409. doi:10.3168/jds.2014-9118.</ref>). GreenFeed Emission Monitoring (GEM) systems are designed for measuring animal emissions in their production environment. As with other sniffer systems, GreenFeed samples breath from individual animals several times (in general 4 to 6 times) per day for short periods (3 to 7 minutes in which an under pressure is created to suck the whole breath of the animal to measure the flux). A minimum air flow of 27 L/min is needed to ensure the entire breath of the cow is captured. If air flow is below this threshold value, the emission rate will be underestimated (McGinn et al, 2021<ref>McGinn, Sean & Coulombe, Jean-Franҫois & Beauchemin, Karen. (2021). Technical Note: Validation of the GreenFeed System for measuring enteric gas emissions from cattle. Journal of Animal Science. 99. 10.1093/jas/skab046.</ref>). Generally the flow is set at 40 L/min. They record CH<sub>4</sub> and carbon dioxide (CO<sub>2</sub>) fluxes during short-term periods of 3-10 minutes when cattle visit an automated feeder fitted with a semi-enclosed head hood in which air is continuously drawn through an air-collection pipe (C-Lock, 2016<ref>C-Lock, 2016. <nowiki>https://www.c-lockinc.com/</nowiki></ref>; Huhtanen et al., 2015<ref name=":0" />; Hammond et al., 2016A<ref>Hammond, K.J., Crompton, L.A., Bannink, A., Dijkstra, J., Yáñez-Ruiz, D.R., O’Kiely, P., Kebreab, E., Eugenè, M.A., Yu, Z., Shingfield, K.J., Schwarm, A., Hristov, A.N., and Reynolds, C.K. 2016A. Review of current in vivo measurement techniques for quantifying enteric methane emission from ruminants. Anim. Feed Sci. Technol. 219:13–30. doi:10.1016/j.anifeedsci.2016.05.018.</ref>; Velazco et al., 2016<ref>Velazco, J. I., Hegarty, R., Cottle, D., and Li, L. 2016. Quantifying daily methane production of beef cattle from multiple short-term measures using the GreenFeed system. <nowiki>https://rune.une.edu.au/web/handle/1959.11/23580</nowiki>.</ref>). Air samples are continually (every second) analyzed for CH<sub>4</sub> concentrations, using a tunable diode laser since 2018, and CO<sub>2</sub> concentrations using a non-dispersive infrared sensor. Gas fluxes are eventually calculated as the product of the air flow in the collection pipe and the concentration of gases corrected for the background concentrations and adjusted to standardized temperature, humidity and pressure. The position of the head in the feeder is detected by an infrared sensor. Gas fluxes are not calculated if the head is not correctly positioned in the feeder as not all the air in the feeder may be collected.

			GreenFeed is a portable standalone system used in barn and pasture applications and incorporates an extractor fan to ensure active airflow and head position sensing for representative breath sampling (Hammond et al., 2016B<ref>Hammond, K.J., Jones, A.K., Humphries, D.J., Crompton, L.A., and Reynolds, C.K. 2016B. Effects of diet forage source and neutral detergent fiber content on milk production of dairy cattle and methane emissions determined using GreenFeed and respiration chamber techniques. J. Dairy Sci. 99:7904–7917. doi:10.3168/jds.2015-10759.</ref>). Measurements are pre-processed by the manufacturer, and data are available in real-time through a web-based data management system (Hammond et al., 2015<ref name=":1">Hammond, K.J., Humphries, D.J., Crompton, L.A., Green, C., and Reynolds, C.K. 2015. Methane emissions from cattle: Estimates from short-term measurements using a GreenFeed system compared with measurements obtained using respiration chambers or sulphur hexafluoride tracer. Anim. Feed Sci. Technol. 203:41-52. doi:10.1016/j.anifeedsci.2015.02.008.</ref>). A year-long service contract with C-Lock is required for a functional GreenFeed. Because GreenFeed captures a high proportion of emitted air and measures airflow, which can be calibrated using a tracer gas, CH<sub>4</sub> emission is estimated as a flux at each visit. Providing visits occur throughout the 24 hours, CH<sub>4</sub> emission can be estimated directly as g/day (Hammond et al., 2015<ref name=":1" />; Huhtanen et al., 2015<ref name=":0" />). More importantly, repeatability of CH<sub>4</sub> measurement must be high so the duration of the measurement period must be taken into account (Huhtanen et al., 2015<ref name=":0" />; Arbre et al., 2016<ref name=":2">Arbre, M., Rochette, Y., Guyader, J., Lascoux, C., Gómez, L.M., Eugène, M., Morgavi, D.P., Renand, G., Doreau, M. and Martin, C. 2016. Repeatability of enteric methane determinations from cattle using either the SF6 tracer technique or the GreenFeed system. Anim. Prod. Sci. 56:238-243.</ref>); (r=0.7 after 17 days duration of measurement period, or r=0.93 after 45 days, Arbre et al., 2016<ref name=":2" />).
			<references />

Lbenzoni at 13:44, 6 March 2024

2024-03-06T13:44:57Z

← Older revision		Revision as of 13:44, 6 March 2024
Line 1:		Line 1:
	GreenFeed (C-Lock Inc., Rapid City, South Dakota, USA) is a sniffer system where breath samples are provided when animals visit a bait station (Huhtanen et al., 2015). GreenFeed		GreenFeed (C-Lock Inc., Rapid City, South Dakota, USA) is a sniffer system where breath samples are provided when animals visit a bait station (Huhtanen et al., 2015<ref name=":0">Huhtanen, P., Cabezas-Garcia, E.H., Utsumi, S., and Zimmerman, S. 2015. Comparison of methods to determine methane emissions from dairy cows in farm conditions. J. Dairy Sci. 98:3394–3409. doi:10.3168/jds.2014-9118.</ref>). GreenFeed Emission Monitoring (GEM) systems are designed for measuring animal emissions in their production environment. As with other sniffer systems, GreenFeed samples breath from individual animals several times (in general 4 to 6 times) per day for short periods (3 to 7 minutes in which an under pressure is created to suck the whole breath of the animal to measure the flux). They record CH<sub>4</sub> and carbon dioxide (CO<sub>2</sub>) fluxes during short-term periods of 3-10 minutes when cattle visit an automated feeder fitted with a semi-enclosed head hood in which air is continuously drawn through an air-collection pipe (C-Lock, 2016<ref>C-Lock, 2016. <nowiki>https://www.c-lockinc.com/</nowiki></ref>; Huhtanen et al., 2015<ref name=":0" />; Hammond et al., 2016A<ref>Hammond, K.J., Crompton, L.A., Bannink, A., Dijkstra, J., Yáñez-Ruiz, D.R., O’Kiely, P., Kebreab, E., Eugenè, M.A., Yu, Z., Shingfield, K.J., Schwarm, A., Hristov, A.N., and Reynolds, C.K. 2016A. Review of current in vivo measurement techniques for quantifying enteric methane emission from ruminants. Anim. Feed Sci. Technol. 219:13–30. doi:10.1016/j.anifeedsci.2016.05.018.</ref>; Velazco et al., 2016<ref>Velazco, J. I., Hegarty, R., Cottle, D., and Li, L. 2016. Quantifying daily methane production of beef cattle from multiple short-term measures using the GreenFeed system. <nowiki>https://rune.une.edu.au/web/handle/1959.11/23580</nowiki>.</ref>). Air samples are continually (every second) analyzed for CH<sub>4</sub> and CO<sub>2</sub> concentrations using non-dispersive infrared sensors. Gas fluxes are eventually calculated as the product of the air flow in the collection pipe and the concentration of gases corrected for the background concentrations and adjusted to standardized temperature, humidity and pressure. The position of the head in the feeder is detected by an infrared sensor. Gas fluxes are not calculated if the head is not correctly positioned in the feeder as not all the air in the feeder may be collected. GreenFeed is a portable standalone system used in barn and pasture applications and incorporates an extractor fan to ensure active airflow and head position sensing for representative breath sampling (Hammond et al., 2016B<ref>Hammond, K.J., Jones, A.K., Humphries, D.J., Crompton, L.A., and Reynolds, C.K. 2016B. Effects of diet forage source and neutral detergent fiber content on milk production of dairy cattle and methane emissions determined using GreenFeed and respiration chamber techniques. J. Dairy Sci. 99:7904–7917. doi:10.3168/jds.2015-10759.</ref>). Measurements are pre-processed by the manufacturer, and data are available in real-time through a web-based data management system (Hammond et al., 2015<ref name=":1">Hammond, K.J., Humphries, D.J., Crompton, L.A., Green, C., and Reynolds, C.K. 2015. Methane emissions from cattle: Estimates from short-term measurements using a GreenFeed system compared with measurements obtained using respiration chambers or sulphur hexafluoride tracer. Anim. Feed Sci. Technol. 203:41-52. doi:10.1016/j.anifeedsci.2015.02.008.</ref>). Because GreenFeed captures a high proportion of emitted air and measures airflow, which can be calibrated using a tracer gas, CH<sub>4</sub> emission is estimated as a flux at each visit. Providing visits occur throughout the 24 hours, CH<sub>4</sub> emission can be estimated directly as g/day (Hammond et al., 2015<ref name=":1" />; Huhtanen et al., 2015<ref name=":0" />). More importantly, repeatability of CH<sub>4</sub> measurement must be high so the duration of the measurement period must be taken into account (Huhtanen et al., 2015<ref name=":0" />; Arbre et al., 2016<ref name=":2">Arbre, M., Rochette, Y., Guyader, J., Lascoux, C., Gómez, L.M., Eugène, M., Morgavi, D.P., Renand, G., Doreau, M. and Martin, C. 2016. Repeatability of enteric methane determinations from cattle using either the SF6 tracer technique or the GreenFeed system. Anim. Prod. Sci. 56:238-243.</ref>); (r=0.7 after 17 days duration of measurement period, or r=0.93 after 45 days, Arbre et al., 2016<ref name=":2" />).

	Emission Monitoring (GEM) systems are designed for measuring animal emissions in their production environment. As with other sniffer systems, GreenFeed samples breath from individual animals several times (in general 4 to 6 times) per day for short periods (3 to 7 minutes in which an under pressure is created to suck the whole breath of the animal to measure the flux). They record ~~CH4~~ and carbon dioxide (~~CO2~~) fluxes during short-term periods of 3-10 minutes when cattle visit an automated feeder fitted with a semi-enclosed head hood in which air is continuously drawn through an air-collection pipe (C-Lock, 2016; Huhtanen et al., 2015; Hammond et al., 2016A; Velazco et al., 2016). Air samples are continually (every second) analyzed for ~~CH4~~ and ~~CO2~~ concentrations using non-dispersive infrared sensors. Gas fluxes are eventually calculated as the product of the air flow in the collection pipe and the concentration of gases corrected for the background concentrations and adjusted to standardized temperature, humidity and pressure. The position of the head in the feeder is detected by an infrared sensor. Gas fluxes are not calculated if the head is not correctly positioned in the feeder as not all the air in the feeder may be collected. GreenFeed is a portable standalone system used in barn and pasture applications and incorporates an extractor fan to ensure active airflow and head position sensing for representative breath sampling (Hammond et al., 2016B). Measurements are pre-processed by the manufacturer, and data are available in real-time through a web-based data management system (Hammond et al., 2015). Because GreenFeed captures a high proportion of emitted air and measures airflow, which can be calibrated using a tracer gas, ~~CH4~~ emission is estimated as a flux at each visit. Providing visits occur throughout the 24 hours, ~~CH4~~ emission can be estimated directly as g/day (Hammond et al., 2015; Huhtanen et al., 2015). More importantly, repeatability of ~~CH4~~ measurement must be high so the duration of the measurement period must be taken into account (Huhtanen et al., ~~2013~~; Arbre et al., 2016); (R=0.7 after 17 days duration of measurement period, or R=0.93 after 45 days, Arbre et al., 2016).

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2024-02-14T20:12:20Z

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GreenFeed (C-Lock Inc., Rapid City, South Dakota, USA) is a sniffer system where breath samples are provided when animals visit a bait station (Huhtanen et al., 2015). GreenFeed

Emission Monitoring (GEM) systems are designed for measuring animal emissions in their production environment. As with other sniffer systems, GreenFeed samples breath from individual animals several times (in general 4 to 6 times) per day for short periods (3 to 7 minutes in which an under pressure is created to suck the whole breath of the animal to measure the flux). They record CH4 and carbon dioxide (CO2) fluxes during short-term periods of 3-10 minutes when cattle visit an automated feeder fitted with a semi-enclosed head hood in which air is continuously drawn through an air-collection pipe (C-Lock, 2016; Huhtanen et al., 2015; Hammond et al., 2016A; Velazco et al., 2016). Air samples are continually (every second) analyzed for CH4 and CO2 concentrations using non-dispersive infrared sensors. Gas fluxes are eventually calculated as the product of the air flow in the collection pipe and the concentration of gases corrected for the background concentrations and adjusted to standardized temperature, humidity and pressure. The position of the head in the feeder is detected by an infrared sensor. Gas fluxes are not calculated if the head is not correctly positioned in the feeder as not all the air in the feeder may be collected. GreenFeed is a portable standalone system used in barn and pasture applications and incorporates an extractor fan to ensure active airflow and head position sensing for representative breath sampling (Hammond et al., 2016B). Measurements are pre-processed by the manufacturer, and data are available in real-time through a web-based data management system (Hammond et al., 2015). Because GreenFeed captures a high proportion of emitted air and measures airflow, which can be calibrated using a tracer gas, CH4 emission is estimated as a flux at each visit. Providing visits occur throughout the 24 hours, CH4 emission can be estimated directly as g/day (Hammond et al., 2015; Huhtanen et al., 2015). More importantly, repeatability of CH4 measurement must be high so the duration of the measurement period must be taken into account (Huhtanen et al., 2013; Arbre et al., 2016); (R=0.7 after 17 days duration of measurement period, or R=0.93 after 45 days, Arbre et al., 2016).