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. 2020 May 5;98(5):skaa116. doi: 10.1093/jas/skaa116

Table 9.

Effect of AFEX wheat straw diet and a recombinant fibrolytic enzyme on intake, production performance, and carcass characteristics of finishing lambs (n = 15 per treatment)

Control AFEX1 P-value
Item Enz− 2 Enz+ 3 Enz− Enz+ SEM Diet Enz4 Diet × Enz
DMI, kg/d
 0 to 14 d 1.12b 1.04b 1.15b 1.27a 0.087 0.001 0.54 0.007
 0 to 28 d 1.21c 1.15c 1.30b 1.43a 0.110 <0.001 0.28 0.003
 0 to 42 d 1.29c 1.21c 1.39b 1.51a 0.117 <0.001 0.53 0.002
 0 to 56 d 1.35c 1.27c 1.45b 1.56a 0.121 <0.001 0.66 0.002
 0 to 70 d 1.42b 1.34b 1.50b 1.59a 0.135 <0.001 0.80 0.01
 0 to end 1.52 1.47 1.58 1.63 0.088 0.003 0.92 0.13
ADG, g/d
 0 to 14 d 294b 273b 329b 394a 33.7 <0.001 0.27 0.04
 0 to 28 d 302 318 325 368 39.7 0.004 0.02 0.27
 0 to 42 d 306 301 326 327 38.7 0.03 0.82 0.76
 0 to 56 d 308 295 324 316 42.5 0.07 0.31 0.79
 0 to 70 d 308 298 318 311 44.3 0.21 0.38 0.86
 0 to end 301 295 309 300 51.1 0.51 0.45 0.90
G:F
 0 to 14 d 0.259 0.276 0.288 0.316 0.0178 0.05 0.21 0.77
 0 to 28 d 0.249 0.278 0.249 0.257 0.0118 0.23 0.04 0.26
 0 to 42 d 0.236ab 0.252a 0.234ab 0.217b 0.0111 0.01 0.96 0.01
 0 to 56 d 0.226a 0.236a 0.218a 0.202b 0.0121 <0.001 0.52 0.02
 0 to 70 d 0.216a 0.222a 0.212a 0.195b 0.0120 0.003 0.27 0.03
 0 to end 0.197 0.200 0.193 0.183 0.0223 0.04 0.45 0.21
Initial BW, kg 25.4 24.0 24.3 25.3 2.69 0.91 0.86 0.20
Final BW, kg 53.0 51.7 51.4 52.0 2.00 0.58 0.74 0.43
DOF5, d 97 97 91 91 — 0.04 1.00 1.00
HCW6, kg 23.8 23.2 23.6 23.9 2.28 0.66 0.80 0.51
Dressing percentage 45.6 45.8 46.0 46.0 0.57 0.58 0.86 0.87
Grade rule, mm 15.2 15.3 16.9 16.4 1.55 0.09 0.77 0.70
Grade7
 YG1, % 6.7 20.0 6.7 6.7 — 0.55 0.55 0.55
 YG2, % 66.7 60.0 40.0 46.7 — 0.30 0.95 0.72
 YG3, % 26.7 20.0 53.3 46.7 — 0.10 0.65 0.87

1AFEX = ammonia fiber expansion treatment (30% AFEX straw pellets on a dietary DM basis replacing alfalfa hay pellets).

2Enz− = diet without enzyme.

3Enz+ = diet with enzyme.

4Enz = recombinant fibrolytic enzyme treatment effect (XYL10C, a β-1,4-xylanase, EC 3.2.1.8, GH10 from Aspergillus niger).

5DOF = number of days on feed.

6HCW = hot carcass weight.

7Yield grade based on grade rule measurements at least 30 min after cooling. YG1 = 5 to 11 mm, YG2 = 12 to 18 mm, YG3 = 19 to 23 mm. YG1 is optimal and declining to YG3.

a–cWithin a row, means without a common superscript differ (P < 0.05).