Diurnal and Seasonal Patterns of Methane Emissions from a Dairy Operation in North China Plain

Table 2

Herd structure and feed composition during the four seasons.

Items	Heads	Corn silage (kg head^−1 d^−1)	Concentrates (kg head^−1 d^−1)	Total dry matter intake (kg head^−1 d^−1)
Lactating cows	722	10.48	9.25	19.73
Nonlactating cows	216	9.55	2.49	12.04
Heifer (12–24 months)	238	8.68	4.87	13.55
Calves (3–12 months)	103	3.71	2.36	6.07
Calves (<3 months)	66