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  • Title: The effects of dietary supplementation of microencapsulated and the extract of seed on growth performance, immune functions, and serum biochemical parameters in broiler chickens.
    Author: Song D, Wang YW, Hou YJ, Dong ZL, Wang WW, Li AK.
    Journal: J Anim Sci; 2016 Aug; 94(8):3271-3277. PubMed ID: 27695776.
    Abstract:
    This experiment was conducted to investigate the effects of microencapsulted (MEF) and the extract of seed (ECOS) on growth performance, immune functions, and serum biochemical parameters in broiler chickens. A total of 240 1-d-old male broilers were randomly allotted into 6 treatments with 8 replicates/treatment and 5 broilers in each cage. The dietary treatments included 1) a basal diet without antibiotic (group A), 2) the basal diet + 1 g MEF/kg diet (1 × 10 cfu/g MEF; group B), 3) the basal diet + 300 mg ECOS/kg diet (group C), 4) the basal diet + 300 mg ECOS/kg diet + 1 g MEF/kg diet (group D), 5) the basal diet + 500 mg ECOS/kg diet (group E), and 6) the basal diet + 500 mg ECOS/kg diet + 1 g MEF/kg diet (group F). The feeding experiment included 2 phases: the starter phase from Day 1 through 21 and the grower phase from Day 22 through 42. The results showed that a diet supplemented with MEF and ECOS had no significant effect on ADG, ADFI, feed conversion ratio, and average BW during the whole experimental period ( > 0.05), but group F showed an improving trend in growth performance. Serum IL-2, IgA, and IgG levels and spleen index were significantly affected by dietary treatment ( < 0.05). Serum IgA and IgG levels and spleen index in group F were significantly higher than in the group A ( < 0.05), and the IL-2 level was significantly decreased ( < 0.05) on Days 21 and 42. Compared with the group A, diets supplemented with MEF and ECOS can significantly decrease total cholesterol, low-density lipoprotein cholesterol, triglycerides, and blood urea nitrogen levels ( < 0.05) and increase the high-density lipoprotein cholesterol level on Days 21 and 42. Concentrations of serum biochemical parameters were significantly increased in group F ( < 0.05). In summary, the results indicated that dietary supplementation of MEF and/or ECOS had no significant effect on growth performance but significantly increased spleen index and the levels of serum IgA and IgG and improved serum lipid metabolism. The 1 g MEF/kg diet (1 × 10 cfu/g diet) plus 500 mg ECOS/kg diet was the optimum supplemental dose in this experiment.
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