In broiler chickens injected intraperitoneally with LPS, a decrease in the levels of AgRP mRNA and NPY mRNA was clearly observed, while the expression of anorexigenic neuropeptides was unchanged [141], implying that the decrease in the expression levels of AgRP and NPY genes might be one of the main reasons for the anorexia induced by LPS. This evidence concerns the gene AGRP and Anorexia.