Table 2.

Initial and final body weight (in kg), body weight gain (in kg), and feed consumption (in g/day) of laying hens fed rations containing different concentrations of caffeine for 12 weeks.

Caffeine in diet	Initial body weight (kg)	Final body weight (kg)	Bodyweight gain (g)	Feed consumption (g/hen.day)	Consumed caffeine (mg/hen)
0 (control)	1.59 ± 0.01	1.60 ± 0.01a	16.8 ± 6.99a	108.4 ± 0.96a	0
150 ppm	1.63 ± 0.02	1.58 ± 0.01a	−51.3 ± 10.7b	109.1 ± 0.85a	16.365
300 ppm	1.63 ± 0.02	1.54 ± 0.01b	−97.8 ± 14.5c	106.4 ± 1.05a	31.920
450 ppm	1.60 ± 0.02	1.49 ± 0.01c	−113.5 ± 10.5c	98.3 ± 1.26b	44.235
p	n.s.	<0.001	<0.001	<0.001	–

Data are shown as mean ± SEM.

^{a, b, c}Different letters in the same column show significant difference (p < 0.05, ANOVA followed by Tukey test).

n.s., non-significant.

n = 24.