Effects of different sources of carbohydrates on intake, digestibility, chewing, and performance of Holstein dairy cows

Table 3 Body weight, intake, and digestibility of nutrients of three total mixed rations containing three different sources of non-fiber carbohydrates

Item	Treatments¹			SEM	P value
Item	B	BC	BB	SEM	P value
BW, kg	600.63	591.84	583.25	11.212	0.140
Intake, kg/d
DM	21.14^b	21.02^b	22.32^a	0.530	0.004
NDF	7.65^b	7.76^b	8.57^a	0.021	0.001
peNDF_m²	5.10^b	5.14^b	5.74^a	0.034	0.025
peNDF _{> 8}³	2.63	2.68	2.68	0.231	0.075
peNDF _{> 1.18}⁴	5.07^b	5.15^b	5.75^a	0.023	0.024
CP	3.42	3.34	3.55	0.456	0.133
NFC	8.22	8.18	8.46	0.345	0.309
Starch	4.69^a	4.25^a	3.24^b	0.431	0.002
Sugar	0.66	0.59	0.73	0.084	0.064
NDSC⁵	2.88^c	3.34^b	4.49^a	0.104	0.001
EE	0.49	0.50	0.54	0.121	0.087
OM	19.79	19.78	20.96	0.961	0.342
Digestibility, %
DM	64.58^b	65.01^b	66.91^a	0.824	0.004
NDF	61.58^b	62.38^b	68.82^a	1.028	0.004
ADF	51.67	52.21	52.33	0.769	0.100
CP	77.33	77.42	76.89	0.571	0.532
NFC	83.36^a	80.37^b	80.90^b	1.424	0.032
EE	62.44^b	66.52^ab	67.33^a	0.277	0.024
OM	64.68	64.61	63.53	1.143	0.200

^{a, b, c}Means within a row with different subscripts differ (P < 0.05).
¹Treatments were diets containing barley + basal diet (B), barley and corn + basal diet (BC), and barley and beet pulp + basal diet (BB).
²peNDF_m = physically effective NDF based on DM retained on sieve 1.18 mm [13].
³peNDF_>8 = physically effective NDF, determined as the proportion of DM retained on sieves of the original version of Penn State particle separator [10].
⁴peNDF_>1.18 = physically effective NDF determined as the proportion of DM retained on sieves of the new version of Penn State particle separator [11].
⁵NDSC = Neutral detergent soluble carbohydrate.

ISSN: 2049-1891