Zoo-technical responses of growing cattle fed sun-dried brewers’ spent grain at 20% of dietary inclusion

Bulletin of the National Research Centre

Table 1 Chemical characterisation of sun-dried brewers’ spent grain and other feedstuffs used in the feeding trial

	Brewers’ spent grain*	Concentrate mixture	Green oats	Paddy straw
Nutrient profile (g/kg)
Crude protein^a	230	227	74.4	44.3
Ether extract	71.5	21.5	46.6	14.9
Crude fibre	168	125	336	633
Ash	34.3	126	90.8	141
Nitrogen-free extract^b	496	501	453	167
Neutral detergent fibre	586	485	592	670
Acid detergent fibre	232	179	424	520
Hemicellulose^c	354	306	168	150
Acid detergent lignin	16.0	–	–	–
Total carbohydrates^d	664	626	788	800
Non-fibrous carbohydrates^e	78.0	141	196	130
Calcium	4.70	–	–	–
Phosphorus	6.70	–	–	–
Energy values
Total digestible nutrients (g/kg)^f	766	703	–	–
Metabolisable energy (ME; MJ/kg)^g	11.5	10.5	–	–
Net energy for maintenance (MJ/kg)^h	7.61	6.79	–	–
Net energy for gain (MJ/kg)ⁱ	4.98	4.26	–	–
In vitro gas production (mL/g)	115	–	–	–

^aNitrogen × 6.25
^b1000 − ash (g/kg) − crude protein (g/kg) − ether extract (g/kg) − crude fibre (g/kg)
^cNeutral detergent fibre (g/kg) − acid detergent fibre (g/kg)
^d1000 − ash (g/kg) − crude protein (g/kg) − ether extract (g/kg)
^eTotal carbohydrates (g/kg) − neutral detergent fibre (g/kg)
^f0.9918 × crude protein (g/kg) + 1.272 × ether extract (g/kg) + 0.0318 × crude fibre (g/kg) + 0.8904 × nitrogen-free extract (g/kg) (Owens et al. 2010)
^gTotal digestible nutrients (g/kg) × 0.015 (NRC 2001)
^h{1.37 × ME (Mcal/kg) − 0.138 × [ME (Mcal/kg)]² + 0.0105 × [ME (Mcal/kg)]³ − 1.12} × 4.184 (NRC 2001)
ⁱ{1.42 × ME (Mcal/kg) − 0.174 × [ME (Mcal/kg)]² + 0.0122 × [ME (Mcal/kg)]³ − 1.65} × 4.184 (NRC 2001)
*Based on minimum number of sample analysis of 8