Effect of an Herbal Mixture of Oregano, Garlic, Sage and Rock Samphire Extracts in Combination with Tributyrin on Growth Performance, Intestinal Microbiota and Morphology, and Meat Quality in Broilers

The present study investigated the effects of two feed additives, the first containing an herbal mixture of oregano, garlic, sage, and rock samphire extracts and the second containing tributyrin (glyceryl tributyrate) when fed to broiler chickens. A total of 360 one-day-old chicks were randomly allocated to four treatments (6 replicate pens of 15 chicks). One treatment served as the unsupplemented control, whereas the feeds of the other three treatments were supplemented either with the herbal additive (3 g/kg), the tributyrin additive (1 g/kg), or both additives. The duration of the trial was 37 days. Data were collected on growth performance, intestinal microbiota and morphology, and some meat quality parameters. The combined supplementation improved ( p < 0.05) weigh gain, feed conversion ratio, and the European Efficiency Factor. In the cecum, the combined supplementation lowered ( p < 0.05) the microbial populations of aerobes, anaerobes, Escherichia coli , total Enterobacteriaceae , and Clostridium spp. compared to the other treatments. Fecal coccidial oocyst counts were also reduced ( p < 0.01) by the combined supplementation. The herbal mixture supplementation improved ( p < 0.05) breast and thigh meat resistance to oxidation. In conclusion, the combined dietary supplementation with the examined feed additives could be utilized to improve the performance and intestinal health of broiler chickens.