Table 1.

Maintenance schedules of the environmental monitoring instruments for the study.

Instrument	Function	Maintenance	Frequency of
			Maintenance
Innova 1412	Gas analyzer (NH3, CO2, CH4, N2O, dew-point temperature)	Challenge	Weekly
		Calibration	Reading is 5% off the reference
Chillgard RT	O2 analyzer	Calibration	Weekly
Thermocouple	Temperature sensor	Calibration	Once (start of flock)
Vaisala HMP 61U	Relative humidity transmitter	Calibration	Once (start of flock)
Setra 264	Static pressure sensor	Calibration	Once (start of flock)
WE100	Barometric pressure sensor	Calibration	Once (start of flock)
Desiccant	H2O removal for O2 analyzer	Change	Weekly
Heat trace and tape	Condensation prevention	Temperature check	Weekly
Vacuum pump	Gas sampling	Leakage check	Biweekly
		Flow check	Weekly
Teflon tubing	Gas sampling line	Leakage check	Biweekly
Flow meters	Gas sampling line	Flow check	Weekly
Filter	Sample line dust filtration	Change	Every two months
TEOM	PM sampler	Filter change	Weekly
		Clean of cyclone head	Weekly
		Leakage check	Weekly
		Flow check	Once (start of flock)
		Mass transducer calibration constant factor check	Once (start of flock)
		Pump check	Weekly