Table 4. Effect of a multi-protease in the diet on carcass trait of broiler chickens1),2)
| PC | PC-150 | NC | NC-150 | NC-300 | ENC | ENC-150 | ENC-300 | SEM | p-value |
Crude protein (%) | - | - | −0.5 | −0.5 | −0.5 | −1 | −1 | −1 | | |
Amino acid3) (%) | - | - | −2 | −2 | −2 | −4 | −4 | −4 | | |
Day 21 |
Empty BW (%) | 89.63 | 89.75 | 89.47 | 89.35 | 86.86 | 89.33 | 90.01 | 89.51 | 0.300 | 0.409 |
Drumstick (%) | 8.37 | 8.47 | 8.07 | 8.65 | 8.14 | 8.66 | 8.22 | 8.36 | 0.077 | 0.475 |
Breast meat (%) | 21.09abc | 21.63ab | 20.69bc | 21.24ab | 21.88a | 20.16c | 21.37ab | 21.69ab | 0.115 | 0.006 |
Day 35 |
Empty BW (%) | 91.49 | 90.87 | 91.08 | 91.08 | 91.05 | 91.8 | 91.39 | 91.70 | 0.135 | 0.756 |
Drumstick (%) | 8.49 | 8.13 | 8.44 | 8.53 | 8.09 | 8.30 | 8.40 | 8.56 | 0.098 | 0.945 |
Breast meat (%) | 24.82b | 26.01a | 24.54b | 24.88b | 26.06a | 24.74b | 25.94a | 26.11a | 0.114 | < 0.001 |
The eight dietary treatments were: positive control (PC), negative control (NC: minus 0.5% from PC, and minus 2% of lysine, methionine, threonine and methionine plus cysteine), extreme negative control (ENC: minus 1% from PC, minus 4% of lysine, methionine, threonine and methionine plus cysteine), and plus multi-protease 150 or 300 g per ton (e. g., PC-150); PC, PC-150, NC, NC-150, NC-300, ENC, ENC-150, ENC-300.
Values are the mean of eight replicates per treatment.
List of amino acids: lysine, methionine, threonine and methionine + cystine.
Means with different superscripts in the same row were significantly different (Turkey’s multiple range test, p < 0.05).
BW, body weight.