Fig 4.
Forest plot of feed conversion ratio (FCR) of broiler chickens fed grape pomace. CI = confidence interval; I2 = Inconsistency index. The solid vertical line depicts a mean difference of zero (0) or no effect. Points to the left of the no effect line (zero) depict a decrease in FCR and opposite depicts an increase in FCR. Individual square in the plot represents the mean effect size for each experiment, while the upper and lower 95 % CI for the effect size are the line that joined the squares. The dotted line with the diamond at the base showing the 95 % CI depicts the pooled estimation. I2 = inconsistency index is a measure of variance above chance among articles utilized in the analysis. Pooled estimation is considered significant when the line of no effect does not touch the diamond at the bottom of the forest plot (Koricheva et al., 2013).