Characterization and mitigation option of greenhouse gas emissions from lactating Holstein dairy cows in East China

Table 6 Lactation performance of lactating Holstein dairy cows with different milk fat yields¹

Items²	LMFY	MMFY	HMFY	SEM	P-value
Milk fat yield, g/d	1138^c	1435^b	1732^a	15.38	0.029
Milk yield, kg/d	32.1^c	39.1^b	44.2^a	2.01	0.038
Milk fat, %	3.59^c	3.71^b	3.94^a	0.27	0.041
Milk protein, %	3.18^c	3.31^b	3.41^a	0.32	0.048
Total milk solids, %	12.6	12.3	12.6	0.93	0.863
FCM yield, kg/d	29.9^c	37.2^b	43.6^a	2.79	0.036
ECM yield, kg/d	30.5^c	37.8^b	44.7^a	2.95	0.041

¹LMFY low milk fat yield (< 1278, n = 39), MMFY medium milk fat yield (1278–1550, n = 41), HMFY high milk fat yield (> 1550, n = 31), n number of observations in the data set
²FCM Fat-corrected milk (kg/d) = 0.4 × milk yield (kg/d) + 15 × fat yield (kg/d). ECM Energy-corrected milk (kg/d) = milk yield (kg/d) × [(38.3 × fat (%) × 10 + 24.2 × protein (%) × 10 + 16.54 × lactose (%) × 10 + 20.7) ÷ 3140]
^a-cMeans in the same row with different superscripts are significantly different (P < 0.05)

ISSN: 2049-1891