Niacin supplementation improves growth performance and nutrient utilisation in Chinese Jinjiang cattle

Figures & data

Table 1. Composition and nutrient levels of the finishing diet (DM basis).

Ingredient	Percentage	Nutrients	Content
Elephant grass	20.0	NE, MJ/kg^b	4.62
Corn	52.8	CP, %	11.38
Wheat bran	13.6	Ca, %	0.45
Soybean meal	3.2	P, %	0.25
Cottonseed	8.0	NDF, %	25.36
CaHPO4	0.4	ADF, %	13.73
Limestone	0.6
NaCl	0.4
Premix^a	0.8

^a Ingredients of premix: vitamin A 250,000 U, vitamin D₃ 40,000 U, vitamin E 1000 U, Cu (CuSO₄·5 H₂O) 1 g/kg, Fe (FeSO₄·7 H₂O) 5 g/kg, Mn (MnSO₄ H₂O) 4 g/kg, Zn (ZnSO₄·7 H₂O) 3 g/kg, Se (Na₂SeO₃) 0.01 g/kg, I (KI) 0.05 g/kg, Co (CoSO₄·7 H₂O) 0.01 g/kg, and Mg (MgSO₄) 50 g/kg.

^b Calculated value.

Table 2. Effects of niacin supplementation on the growth performance of finishing Jinjiang cattle.

		Control	NA320	NA480	NA640	SEM
BW, kg	0 d	201.19	199.37	205.34	203.11	15.20
	28 d	214.63	213.93	224.10	222.43	18.49
	56 d	227.79	226.81	240.62	239.79	19.66
ADG, kg/d	1–28 d	0.48^b	0.52^a,b	0.67^a,b	0.69^a	0.14
	29–56 d	0.47	0.46	0.59	0.62	0.18
	1–56 d	0.48^b	0.49^a,b	0.63^a	0.66^a	0.18
TDMI, kg/d	1–28 d	5.28	5.32	5.45	5.20	0.16
	29–56 d	5.87	5.66	5.89	5.75	0.15
	1–56 d	5.58	5.49	5.67	5.47	0.16
F/G	1–28 d	11.01^a	10.24^a	8.14^b	7.53^b	0.78
	29–56 d	12.49^a	12.31^a	9.98^b	9.27^b	0.92
	1–56 d	11.74^a	11.21^a	9.00^b,c	8.35^c	0.84

In the same row, values without a common letter differ significantly (p < .05).

Control: basal finishing diet; NA₃₂₀: basal finishing diet +320 mg/kg niacin; NA₄₈₀: basal finishing diet +480 mg/kg niacin; NA₆₄₀: basal finishing diet +640 mg/kg niacin. SEM: standard error of mean; BW: body weight; ADG: average day gain; TDMI: total dry matter intake; F/G: feed to gain.

Table 3. Effects of niacin supplementation on the dietary nutrient apparent digestibility in finishing Jinjiang cattle (%).

	Control	NA320	NA480	NA640	SEM
DM	61.64^b	62.11^b	63.12^b	65.33^a	1.62
OM	65.31^b	66.28^a,b	67.75^a,b	68.42^a	1.84
CP	59.09^b	62.96^b	65.64^a	63.15^a	0.97
NDF	58.76^b	57.04^b	55.43^b	62.87^a	1.97
ADF	40.83^b	41.68^b	44.05^b	49.91^a	2.66

In the same row, values without a common letter differ significantly (p <.05).

Control: basal finishing diet; NA₃₂₀: basal finishing diet +320 mg/kg niacin; NA₄₈₀: basal finishing diet +480 mg/kg niacin; NA₆₄₀: basal finishing diet +640 mg/kg niacin. SEM: standard error of mean; DM: dry matter; OM: organic matter; CP: crude protein; NDF: neutral detergent fibre; ADF: acid detergent fibre.

Table 4. Effects of niacin supplementation on the serum biochemical parameters of finishing Jinjiang cattle.

	Control	NA320	NA480	NA640	SEM
GLU, mmol/L	3.79	3.61	3.23	3.62	0.22
TP, g/L	82	76	71	79	1.07
UN, mmol/L	4.98	5.47	5.16	5.34	0.43
TG, mmol/L	0.25	0.24	0.24	0.23	0.04
TC, mmol/L	2.78	3.63	3.21	3.09	0.49
NEFA, μmol/L	54.31^c	84.46^c	160.27^b	227.85^a	42.37
β-HBA, mmol/L	0.23	0.24	0.25	0.24	0.03

In the same row, values without a common letter differ significantly (p < .05).

Control: basal finishing diet; NA₃₂₀: basal finishing diet +320 mg/kg niacin; NA₄₈₀: basal finishing diet +480 mg/kg niacin; NA₆₄₀: basal finishing diet +640 mg/kg niacin. SEM: standard error of mean; Glu: serum glucose; TP: total protein; UN: urea nitrogen; TG: triglyceride; TC: total cholesterol; NEFA: non-esterified fatty acids; β-HBA: β-hydroxy butyric acid.