Table 6. Effect of multi-protease in the diet on ileum digestibility co-efficient of broiler chickens^1),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	−1.0	−1.0	−1.0
Amino acid³⁾ (%)	-	-	−2.0	−2.0	−2.0	−4.0	−4.0	−4.0
Day 21
Dry matter	0.79^ab	0.80^a	0.78^bc	0.80^abc	0.81^ab	0.77^c	0.78^bc	0.79^bc	0.002	< 0.001
Crude protein	0.70^bc	0.73^a	0.67^de	0.70^bc	0.71^ab	0.66^e	0.68^cde	0.69^bcd	0.003	< 0.001
Energy	0.79^ab	0.80^a	0.78^b	0.79^ab	0.79^ab	0.77^b	0.77^b	0.78^ab	0.003	0.030
Day 35
Dry matter	0.81^bc	0.82^a	0.80^cd	0.81^ab	0.81^a	0.80^d	0.80^cd	0.81^bc	0.001	0.005
Crude protein	0.81^b	0.82^a	0.79^bc	0.80^bc	0.81^b	0.78^c	0.79^bc	0.79^c	0.002	< 0.001
Energy	0.80^ab	0.81^a	0.79^bc	0.80^ab	0.80^ab	0.78^c	0.78^c	0.79^bc	0.002	0.002

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 + cysteine.
Means with different superscripts in the same row were significantly different (Turkey’s multiple range test, p < 0.05).