Table 3: Effect of feeding diets containing various levels of crude protein (CP) and lysine (Lys) on body weight gain, feed intake, and feed conversion ratio of broiler chicks (Experiment 1-1).

TreatmentsBWG (gr)FI (gr)FCR (gr/gr)
NumberCP (%)Lys (%)1–7 d1–10 d1–7 d1–10 d1–7 d1–10 d

123.21.5223.7a351.1a190.3a349.90.8510.997
223.21.4215.7ab338.9abc185.9ab343.80.8621.014
323.21.3215.6ab341.5ab190.7a350.10.8851.025
423.21.2205.7bc324.9cd180.0b340.40.8751.032
5211.5210.7bc329.4bcd187.2ab344.20.8881.045
6211.4209.1bc329.6bcd183.7ab343.00.8791.041
7211.3207.6bc327.0bcd184.9ab339.70.8911.039
8211.2204.1c316.4d178.9b333.20.8771.053
Pooled SEM3.054.412.394.210.0160.015

Probability

Protein × lysine * * * NSNSNS
Protein * * NSNSNS *
Lysine * * * NSNSNS

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