Table 4: Effect of feeding diets containing various levels of crude protein (CP) and methionine + cystine (Met + Cys) on body weight gain, feed intake, and feed conversion ratio of broiler chicks (Experiment 1-2).

TreatmentsBWG (gr)FI (gr)FCR (gr/gr)
NumberCP (%)Met + Cys (%)1–7 d1–10 d1–7 d1–10 d1–7 d1–10 d

123.20.85214.5332.2a188.8351.3a0.880a1.057ab
223.20.90217.8341.8a184.4352.1a0.847ab1.030bc
323.20.95215.4340.4a177.2333.0b0.823bc0.978c
423.21.00222.0346.7a178.5337.5b0.804c0.973c
5210.85216.3337.4a182.6343.4ab0.844ab1.018bc
6210.90213.3330.8a185.0345.0ab0.867a1.043ab
7210.95208.8312.5b180.6337.0b0.865a1.078a
8211.00214.0333.6a183.5340.6ab0.857ab1.021bc
Pooled SEM2.454.432.894.710.0110.011

Probability

Protein × (Met + Cys)NS * NS * ** *
ProteinNSNSNSNSNSNS
Met + CysNSNSNSNSNSNS

a–dMeans in each column without common superscripts are significantly different.
*Data are means of four replicates having 20 birds in each replicate. BWG: body weight gain, FI: feed intake, FCR: feed conversion ratio, CP: crude protein, Met + Cys: methionine + cystine, SEM: standard error of mean, NS: not statistically significant; * ; ** .