Abstract
1. This study was carried out to investigate the effects of liquidambar essential oils (LEO) isolated from Turkish sweet gum (Liquidambar orientalis Mill.) leaves on growth performance, carcass, edible inner organs (EIO), gastrointestinal traits (gut), some blood metabolites and jejunum microbiota in broilers. 2. A total of 375 one-d-old male broilers (Ross 308) were randomly allocated to 5 treatments with 5 pens with 15 birds. The birds were fed on diets without antibiotics (CONT), with antibiotic (50 mg per kg, AB), with LEOs at 0.0405 (0.04LEO), 0.0811 (0.08LEO) or 0.1622 (0.16LEO) g/kg feed up to 42 d of age. The levels of LEOs included to diets were determined according to in vitro antimicrobial activity. 3. From d 1 to 42, the 0.08LEO treatment had higher live weight gain (LWG) compared to others. The 0.08LEO treatment increased feed intake (FI) compared to the CONT, AB and 0.04LEO. However, the feed conversion ratio (FCR) of these birds was lower than those in the AB and 0.16LEO treatments. From 1 to 42 d of age for LWG, the effects were quadratic and cubic, while those for FI and FCR were cubic and quadratic, respectively. Birds that fed 0.08LEO and AB diets had higher and lower carcass weights (CW) than those that fed ...Continue Reading
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