. 2019 Sep 26;9(10):725. doi: 10.3390/ani9100725

Table 3.

Effects of different dietary concentration level on apparent nutrient digestibility of Holstein cows at age of 9, 12 and 15 months.

Item		Treatments			SEM	p-Value
Item		C30	C40	C50	SEM	p-Value
9 months
	Dry matter	73.3	74.8	75.3	1.00	0.710
	Organic matter	75.3	76.8	77.2	1.00	0.740
	Crude protein	65.6^c	69.3^b	76.5^a	1.53	0.003
	Neutral detergent fiber	69.2^c	72.4^b	76.9^a	1.52	0.012
	Acid detergent fiber	63.0^c	69.4^b	72.9^a	1.87	0.041
12 months
	Dry matter	73.5^b	74.7^b	78.3^a	0.96	0.017
	Organic matter	77.1^b	78.6^b	81.9^a	0.92	0.047
	Crude protein	65.6^b	69.3^b	76.5^a	1.53	0.002
	Neutral detergent fiber	60.8^b	65.4^a	66.9^a	1.66	0.029
	Acid detergent fiber	68.4	69.4	71.1	1.46	0.141
15 months
	Dry matter	75.7^b	76.5^b	83.2^a	1.04	<0.01
	Organic matter	77.9^b	78.7^b	84.9^a	0.99	<0.01
	Crude protein	72.7^b	72.2^b	79.6^a	1.10	<0.01
	Neutral detergent fiber	73.1^b	75.4^a	76.7^a	0.92	0.028
	Acid detergent fiber	71.3^b	73.5^b	77.2^a	1.11	0.046

C30 = diet containing 30% of concentrate; C40 = diet containing 40% of concentrate; C50 = diet containing 50% of concentrate, SEM = standard error of means. ^a,b,c values within a row with different superscripts differ significantly at p < 0.05.