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. 2021 Mar 12;7(2):460–471. doi: 10.1016/j.aninu.2020.09.004

Table 8.

Protein and energy digestibility by total collection method at wk 401.

Item SP2 RP3 RP-Arg4 RP-GAA4 RP-Cit4 SEM P-value
Excreta moisture, % 67.53 60.11 67.90 59.52 60.74 1.29 0.062
Protein digestibility
 CP intake, g/d 26.93b 17.76a 19.08ab 18.66ab 19.21ab 1.12 0.043
 CP intake per unit of BW, g/d 13.45 8.84 9.38 11.31 9.32 0.64 0.105
 CP excreted, g/d 9.22b 5.68a 6.38a 5.76a 6.39a 0.31 0.043
 CP excreted per unit of BW, g/d 4.59b 2.83a 3.19a 3.48a 3.06a 0.15 <0.001
 CP retained, g/d 17.71 12.07 12.73 12.89 12.83 1.01 0.386
 CP retained per unit of BW, g/d 8.86 6.01 6.29 7.83 6.26 0.57 0.511
 CP apparent digestibility, % 63.53 67.08 66.06 66.95 66.09 1.39 0.980
 CP apparent digestibility per unit of BW, % 31.71 33.38 32.42 40.91 32.03 1.22 0.070
Energy digestibility
 GE intake, kcal/d 583.3b 467.8ab 503.3ab 386.9a 494.5ab 21.75 0.049
 GE intake per unit of BW, kcal/d 291.3 232.9 247.4 233.3 239.8 11.44 0.452
 GE excreted, kcal/d 89.54b 68.31ab 74.16ab 60.14a 73.36ab 3.01 0.028
 GE excreted per unit of BW, kcal/d 44.60 33.93 37.02 35.89 35.10 1.41 0.105
 GE retained, kcal/d 493.8 399.5 428.3 326.8 421.1 20.84 0.121
 GE retained per unit of BW, kcal/d 246.7 198.9 210.9 197.4 204.7 11.03 0.616
 GE apparent digestibility, % 83.64 84.98 84.85 84.58 84.82 0.63 0.971
 GE apparent digestibility per unit of BW, % 41.68a 42.30ab 41.49a 51.60b 40.99a 1.19 0.019

GAA = guanidinoacetic acid; Cit = citrulline; CP = crude protein; BW = body weight; GE = gross energy.

a, b Differing superscripts indicate significant differences between means.

1

Statistical analysis of GE intake and GE retained were performed on log transformed data whereas values were actual data.

2

SP: standard protein diet with 17% CP.

3

RP: reduced protein diet with 13% CP.

4

l-Arg, GAA and l-Cit were added on top of the RP diets at 0.35%, 0.46% and 0.35% in diets, RP-Arg, RP-GAA and RP-Cit, respectively, to the level of Arg in SP.