Mehdi Nayebpor  , Parviz Farhomand  , Ali Hashemi  , 
    Effects of Different Levels of Direct Fed Microbial (<I>Primalac</I>) on Growth Performance and Humoral Immune Response in Broiler Chickens,
    Journal of Animal and Veterinary Advances,
    Volume 6,Issue 11,
    2007,
    Pages 1308-1313,
    ISSN 1680-5593,
    javaa.2007.1308.1313,
    (https://makhillpublications.co/view-article.php?doi=javaa.2007.1308.1313)
    Abstract: Probiotics are claimed to have beneficial effects on health. The production parameters, including were monitored weekly during a 6-wk trial. Body weight was affected by dietary treatments in 21, 28 and 42 days of age (p< 0.05). The BW in the  0.1% DFM treatment was significantly (p< 0.05) higher than 0.15% DFM and control in 28 and 42 days. Body weight gain in probiotic treatments was significantly more than control treatment (p< 0.05). Moreover, body weight gains in 0.1% DFM were higher than 0.15% DFM treatment (p< 0.05). Feed intake in control  treatment was significantly higher than (p>0.05) 0.1 or  0.15% DFM treatments. Feed conversion ratio in 0.1 and 0.15% DFM treatments was significantly (p< 0.05) better than control treatment. The  0.1%  DFM  and  control  treatments  have  lowest and highest FCR, respectively. The antibody titer against IBDV in 0.1 and 0.15% DFM treatments were significantly (p< 0.01) more than control treatment but no significant difference among 0.1 and 0.15% treatments. It is concluded that dietary supplementation of DFM probiotic improved body weight, body weight gain and feed conversation ratio and enhanced humoral immune response.
    Keywords: Probiotic;performance;humoral immune response;broiler chickens