Evaluation of Protein Concentration and Limiting Amino Acids Including Lysine and Met + Cys in Prestarter Diet on Performance of Broilers

Table 5

Effect of feeding diets containing two levels of crude protein (CP) and lysine (Lys) on body weight gain, feed intake and feed conversion ratio of male or female broiler chicks at 10 d (Experiment 2-1).

Treatments			BWG (g)		Feed intake (g)		FCR (g/g)
No.	CP (%)	Lys (%)	male	female	male	female	male	female
1	23.2	1.5	336.8	327.4	339.3	335.9	1.007	1.026
2	23.2	1.3	327.5	321.4	344.0	330.5	1.051	1.028
3	21	1.5	322.2	320.4	337.8	335.2	1.049	1.046
4	21	1.3	323.1	309.5	342.3	326.3	1.059	1.054
Pooled SEM			4.22	4.05	2.97	4.50	0.010	0.015
Probability
Protein × Lysine			NS	NS	NS	NS	NS	NS
Protein			NS	NS	NS	NS	NS	NS
Lysine			NS	NS	*	NS	NS	NS

^a–dMeans in each column without common superscripts are significantly different.
*Mean of four replicates having 50 birds. 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; *𝑃<0.05.