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Table 4 Least squares means, for the effect of different amounts of a concentrate mix on intake, digestibility, faecal N, and liveweight

From: Effect of concentrate supplementation on nutrient digestibility and growth of Brahman crossbred cattle fed a basal diet of grass and rice straw

  Concentrate Treatment (% of liveweight)  
  0   0.6   1.2   1.8   2.4   SE Pr > F
Intake
Concentrate intake (kg DM/d) 0.00 a 1.27 b 2.66 c 3.78 d 4.29 d 0.22 <0.0001
Guinea grass intake (kg DM/d) 2.19 a 2.17 a 1.94 ab 1.56 b 1.53 b 0.22 0.0198
Rice straw intake (kg DM/d) 1.83 a 1.72 a 1.56 a 1.11 b 0.61 c 0.11 <0.0001
Substitution rate (kg DM/kg DM) n.a.   0.10 a 0.25 ab 0.37 bc 0.49 c 0.10 0.0143
1OM intake (kg/day) 3.57 a 4.63 b 5.59 c 5.93 c 5.96 c 0.25 <0.0001
2GE intake (MJ/d) 69.3 a 89.7 b 108.0 c 114.5 c 115.3 c 4.9 <0.0001
3CP intake (kg/d) 0.343 a 0.540 b 0.732 c 0.850 d 0.910 d 0.037 <0.0001
4EE intake (kg/d) 0.053 a 0.121 b 0.192 c 0.244 d 0.266 d 0.011 <0.0001
5NDF intake (kg/d) 2.97 a 3.01 a 2.86 a 2.38 a 2.56 a 0.33 0.2994
Digestibility period
OM digestibility (%) 54.3 a 60.7 b 62.8 bc 66.9 c 75.1 d 2.2 <0.0001
Digestible OM intake (kg/d) 1.89 a 2.58 b 3.27 c 3.69 cd 4.25 d 0.27 <0.0001
Gross energy digestibility (%) 75.3 c 80.0 bc 87.8 a 83.3 ab 83.2 ab 3.1 0.0171
Digestible energy intake (MJ/d) 55.7 a 71.2 b 92.7 c 93.3 c 97.2 c 5.3 <0.0001
CP digestibility (%) 57.04 ab 62.1 ab 62.36 ab 66.6 bc 73.03 c 3.1 0.0019
EE digestibility (%) 25.5 d 51.4 c 59.7 b 71.8 a 76.7 a 3.9 <0.0001
NDF digestibility (%) 59.7 a 57.4 a 48.6 b 41.9 b 43.1 b 4.0 0.0012
Faecal N (kg/d) 0.025 a 0.0321 b 0.0413 c 0.0422 c 0.0386 c 0.0022 <0.0001
Liveweight
Initial liveweight (kg) 199 a 206 a 200 a 195 a 200 a 31.4 0.9983
Final liveweight (kg) 208 a 248 b 266 bc 271 c 279 c 6.2 <0.0001
Liveweight gain (kg/d) 0.092 a 0.577 b 0.792 c 0.843 c 0.943 c 0.074 <0.0001
  1. a-d In each row, least squares means followed without a common superscript are significantly different (P < 0.05) according to Fisher’s LSD
  2. 1OM: Organic matter
  3. 2GE: Gross energy
  4. 3CP: Crude protein
  5. 4EE: Ether extract
  6. 5NDF: Neutral detergent fibre