Probiotics administration in feed of broilers displayed a
growth-promoting effect. Significantly improvement in
DWG and FCR of the broilers were shown in B. subtilis
and L. acidophilus treatments, compared with control and
other probiotic treatment groups. Further study indicated a
significant increase of cecal Lactobacilli concentration in
broilers supplemented with probiotics, especially in L.
acidophilus treatment group. Meanwhile, the count of
cecal Actinomyces in birds treated with probiotics was
significantly lower compared with the control group. In
conclusion, probiotics especially B. subtitles and L.
acidophilus used here are potential alternatives to
antibiotics in promoting growth resulting from a
beneficial modulation of the intestinal micro flora, which
leads to increased efficiency of intestinal digestion in the
host animal.