Table 3. Effect of protease dietary supplementation on growth performance in broilers1)

Items (%) CON T1 T2 T3 SEM p-value
Linear Quadratic
1–18 d
 BWG (g) 760b 782b 797ab 815a 6.62 0.0311 0.5891
 FI (g) 1,056 1,077 1,085 1,105 11.18 0.7483 0.3516
 FCR 1.389 1.377 1.361 1.356 0.01 0.2280 0.7339
19–35 d
 BWG (g) 943b 990ab 1,015ab 1,043a 10.75 0.0234 0.9615
 FI (g) 1,635 1,660 1,650 1,676 18.79 0.2314 0.6973
 FCR 1.734a 1.677ab 1.626b 1.607b 0.02 0.0286 0.7306
1–35 d
 BWG (g) 1,703b 1,772b 1,812ab 1,858a 13.25 0.0005 0.6645
 FI (g) 2,691 2,737 2,735 2,781 21.27 0.3329 0.4320
 FCR 1.580a 1.545ab 1.509ab 1.497b 0.02 0.0131 0.6685
Treatment groups: CON, basal diet; T1, basal diet + 0.03% protease; T2, basal diet + 0.06% protease; T3, basal diet + 0.09% protease.
Means in the same row with different superscripts differ (p < 0.05).
BWG, body weight gain; FI, feed intake; FCR, feed conversion ratio.