Effects of dietary extruded linseed andLactobacillus acidophiluson growth performance, carcass traits, plasma lipoprotein response, and caecal bacterial populations in broiler chicks

The study aimed to assess the effects of dietary extruded linseed (ELS) andLactobacillus acidophilus(LA) on performance, carcass traits, immune organ weights, plasma lipoprotein response, and caecal bacteria populations in broiler chickens. A total of 648 one-day-old chicks were divided into six groups in a 3 x 2 factorial arrangement consisting of three ELS levels (0, 6 and 12%) without or with probioticL. acidophilus(0 and 20 g ton(-1)feed). Each group had six replicates (18 birds/pen). Results showed no significant effects of ELS level nor LA supplementation on growth performance (body weight gain, feed intake, and feed conversion) of broilers during the overall period (1-42 days). The production efficiency factor increases (p = .045) with the LA addition. There were no effects of ELS level nor probiotic addition on carcase traits and immune organ weights, except for decreases in abdominal fat percentage (p = .027, respectivelyp = .035). The dietary ELS level significantly correlated with a decrease in the plasma total cholesterol (TC;p = .003), triglycerides, and very-low-density lipoprotein concentrations (p = .020), while the LA addition significantly correlated with a decrease (p = .015) in the plasma TC. The LA addition lowers the caecal pH (p = .007),Staphylococcusspp. andE. colicounts (p < .0001), and increase the caecalLactobacillusspp. and lactobacilli:E. coliratio (p < .0001). In conclusion, the use of ELS up to 12% supplemented withL. acidophilusin broiler chicks diet had a positive effect on health status, decreasing the abdominal fat deposition, plasma lipids and the caecal pathogen bacteriaE. coli.