Effect of reduced energy density of close-up diets on dry matter intake, lactation performance and energy balance in multiparous Holstein cows

Table 4 Effect of energy density of close-up dry period diets on milk yield and composition in Holstein cows

Item	Dietary treatment¹			SEM	P-value
Item	HD	MD	LD	SEM	Diet	Time	Interaction
Milk yield, kg/d
Wk 1 to 3	32.0	32.1	32.2	0.51	0.53	<0.001	0.78
Wk 1 to 10	36.6^b	38.6^a	38.7^a	0.36	0.03	<0.001	0.99
4% FCM yield, kg/d
Wk 1 to 3	44.0	42.4	41.9	0.78	0.55	<0.001	0.72
Wk 1 to 6	45.4	45.7	45.4	0.54	0.90	<0.001	0.91
Fat, %
Wk 1 to 3	6.43^a	5.87^b	5.67^b	0.11	0.02	0.03	0.89
Wk 1 to 6	5.96^a	5.60^b	5.45^b	0.06	0.006	<0.001	0.90
Protein, %
Wk 1 to 3	3.66	3.65	3.67	0.05	0.97	<0.001	0.54
Wk 1 to 6	3.50	3.45	3.48	0.02	0.69	<0.001	0.90
Lactose, %
Wk 1 to 3	4.89^b	5.07^a	5.12^a	0.03	0.02	0.02	0.28
Wk 1 to 6	4.99	5.10	5.12	0.04	0.06	0.002	0.12
Fat, kg/d
Wk 1 to 3	2.05	1.94	1.90	0.04	0.33	<0.001	0.70
Wk 1 to 6	2.07	2.06	2.01	0.03	0.68	<0.001	0.89
Protein, kg/d
Wk 1 to 3	1.17	1.20	1.21	0.03	0.57	<0.001	0.55
Wk 1 to 6	1.22	1.26	1.28	0.01	0.19	<0.001	0.94
Lactose, kg/d
Wk 1 to 3	1.58	1.69	1.72	0.03	0.12	<0.001	0.69
Wk 1 to 6	1.77^b	1.90^a	1.91^a	0.02	0.04	<0.001	0.99

¹HD high energy density diet, MD middle energy density diet, LD low energy density diet.
^{a, b}Values within a row with different superscripts differ significantly at P < 0.05.

ISSN: 2049-1891