Abstract :
[en] We investigated and summarized results from studies evaluating the e ects of feeding
poultry with insects on their growth performances. After a systematic review of studies published
since 2000, two independent reviewers assessed the eligibility of each one based on predefined
inclusion criteria. We extracted information on the study design, insects, avian species, and growth
performances, i.e., average daily gain, feed intake, and feed conversion ratio. Next, we estimated
pooled di erences between performances of poultry fed a diet with vs. without insects through
random-e ects meta-analysis models. Additionally, these models evaluated the e ects of potential
sources of heterogeneity across studies. Of the 75 studies reviewed, 41 met the inclusion criteria and
included 174 trials. With respect to diets without insects, pooled di erences in growth performances
were statistically not di erent from the null, but heterogeneity was marked across studies. Average
daily gain decreased with increasing inclusion rates of insects, going below the null for rates of
10% and more. Grasshoppers were negatively associated with the average daily gain and positively
associated with feed intake. The country of publication was another source of heterogeneity across
publications. Overall, our results show insects should substitute only partially conventional protein
sources and not be grasshoppers to guarantee the appropriate growth of birds.
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