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

Table 7 Lactation performance of lactating Holstein dairy cows with different milk protein yields¹

Items²	LMPY	MMPY	HMPY	SEM	P-value
Milk protein yield, g/d	983^c	1254^b	1490^a	16.7	0.024
Milk yield, kg/d	31.6^c	38.1^b	44.2^a	2.39	0.041
Milk fat, %	3.65^c	3.71^b	3.83^a	0.31	0.039
Milk protein, %	3.16^b	3.31^ab	3.39^a	0.28	0.031
Total milk solids, %	11.8	12.5	12.3	0.79	0.762
FCM yield, kg/d	29.7^c	36.3^b	42.9^a	2.98	0.039
ECM yield, kg/d	30.1^c	37.1^b	43.9^a	3.65	0.025

¹LMPY low milk protein yield (< 1130, n = 35), MMPY medium milk protein yield (1130–1364, n = 39), HMPY high milk protein yield (> 1364, n = 37), 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