Skip to main content
. 2020 Apr 11;99(6):3266–3279. doi: 10.1016/j.psj.2020.03.024

Table 2.

Body weight, body weight gain, and growth rate of 5 strains of broilers fed a control or AA-reduced diet from day 0 to 55.

Treatment
 BW (g)
 BW gain (g)
 Growth rate3 (%)
Strain Diet D0 D14 D28 D41 D55 D0-14 D14-28 D28-41 D41-551 D0-55 D0-14 D14-28 D28-41 D41-55
Strain 1 39.7b,c 407 1,469 2,705 3,834 367 1,062 1,230b,c 1,128 3,794 927 261 83.8 41.8b
Strain 2 39.7b,c 411 1,431 2,665 3,852 371 1,020 1,227c 1,187 3,812 934 248 85.8 44.6a,b
Strain 3 41.8a 451 1,568 2,898 4,183 409 1,117 1,333a 1,285 4,142 979 248 85.3 44.5a,b
Strain 4 39.4c 416 1,448 2,748 4,041 377 1,032 1,300a,b 1,297 4,002 957 248 90.1 47.4a
Strain 5 40.2b 395 1,330 2,508 3,705 355 935 1,173c 1,197 3,665 883 236 88.9 47.9a
SEM2 0.20 2.9 12.9 26.7 45.9 2.9 11.1 18.1 32.4 45.6 8.7 2.2 1.24 1.19
Control 40.1 430 1,529 2,823 4,043 390 1,099 1,291a 1,220 4,003 973 255 84.5 43.2b
Reduced 40.2 402 1,369 2,587 3,803 361 968 1,214b 1,218 3,763 899 241 89.1 47.2a
SEM 0.13 1.8 8.2 16.9 29.0 1.8 7.0 11.6 20.5 29.1 5.5 1.4 0.783 0.75
Strain 1 Control 39.5 419c,d 1,508b,c 2,764b,c 3,884b,c 380b,c,d 1,089b,c 1,255 1,120 3,844b,c 961a,b 260a.b 83.4c 40.5
Strain 1 Reduced 39.8 395e 1,430c,d 2,648c,d 3,783c 355f 1,035c,d 1,204 1,136 3,744c 892c 262a 84.2c 43.0
Strain 2 Control 39.5 416c,d 1,457c,d 2,722c,d 3,862b,c 377c,d,e 1,041c,d 1,250 1,140 3,822b,c 953a,b 250a,b,c,d 85.8b,c 41.8
Strain 2 Reduced 39.9 405d,e 1,404d,e 2,608c,d 3,842b,c 365d,e,f 999d,e 1,204 1,233 3,802b,c 915b,c 247b,c,d 85.8b,c 47.3
Strain 3 Control 42.0 463a 1,642a 3,007a 4,247a 421a 1,180a 1,364 1,240 4,205a 1,002a 255a,b,c 83.0c 41.3
Strain 3 Reduced 41.5 439b 1,493b,c 2,789b,c 4,119a,b 397b 1,054b,c,d 1,303 1,330 4,078a,b 956a,b 240c,d 87.7a,b,c 47.7
Strain 4 Control 39.3 434b,c 1,558b 2,913a,b 4,229a 395b,c 1,123a,b 1,356 1,316 4,190a 1,007a 259a,b 87.0a,b,c 45.2
Strain 4 Reduced 39.5 397e 1,338e 2,583d 3,853b,c 358e,f 941e 1,244 1,278 3,814b,c 907b,c 237d 93.2a,b 49.7
Strain 5 Control 40.1 418c,d 1,480b,c,d 2,711c,d 3,993a,b,c 378b,c,d 1,061b,c,d 1,231 1,282 3,952a,b,c 943b,c 254a,b,c 83.2c 47.4
Strain 5 Reduced 40.3 372f 1,180f 2,305e 3,418d 332g 808f 1,114 1,113 3,378d 823d 217e 94.5a 48.4
SEM 0.28 4.1 18.3 37.8 64.9 4.1 15.7 25.8 45.8 64.5 12.3 3.1 1.75 1.68
P-value Strain <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 0.002 <0.0001 <0.0001 <0.0001 0.003 0.004
Diet 0.496 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 0.955 <0.0001 <0.0001 <0.0001 0.0001 0.0004
Strain × Diet 0.552 0.0007 <0.0001 0.0004 0.0003 0.0007 <0.0001 0.483 0.0321 0.0003 0.005 <0.0001 0.014 0.499

a–fMeans in a column not sharing a common superscript were different (P < 0.05).

1

Tukey's test was not able to separate treatments means of BW gain from day 41 to 55.

2

SEM = standard error of mean; n = 16, 40, and 8 for treatments of strain, diet, and interaction of strain and diet, respectively.

3

Growth rate was calculated by dividing BW gain by initial BW in each period. For example, day 14–28 growth rate = day 14–28 BW gain/D 14 BW × 100%.