Abstract:
The main goal of this research was to understand how the economical and biological
impact of commercial broiler growth performances by feeding with the
supplementation of Bacillus subtilis (DSM 5750) and Bacillus licheniforzis (DSM
5749) and four key variables referring to broiler husbandry with the changes of villus
height (VH) of broiler gastrointestinal tract. A total of 27\-day-old Ross 308 FF broiler
chicks were randomly distributed into three separate groups with 90 chicks each. Each
90 chicks were divided randomly into six replicates each with 15 chicks. All chicks
were subjected to rear under deep litter based open housing system. The experiment
was laid out in a control randomized design (CRD) with having the following three
treatments. The control group is designated as Treatment 0 (T0) which was given only
the basal diet. The Treatment - 1 (T1) is given 4009lton and Treatment - 2 (T2) was
given 500g / ton of tested probiotics added broiler diet respectively. All broiler diets in
different feeding phase up to 35 days of experimental period were formulated based on
Ross 308 FF Nutritional Specifications 2022. All kinds of broiler diets were free of
antibiotic growth promoters (AGP) and natural growth promoters (NGP) and feed form
was crumbling from day 01 to 15 days and pelleted diet since day 16 to 35 respectively.
Weekly data on mortality, feed intake, body weight and feed conversion ratio (FCR)
were recorded. The samples of gastrointestinai tract (Duodenum, Jejunum & Ileum) of
six sacrificed broilers of each treatment at 35 days were subjected to histological
studies. The results showed that inclusion of 400g/ton of tested probiotic (Bacillus
subtilis (DSM5750) and Bacillus licheniforuzls (DSM5749)) had significant effects on
broiler growth performances parameters concluding as broiler performance efficiency
index (BPEI) and duodenal morphometry of commercial broilers over the basal diet
used in control group. Further studies under equal field conditions should be conducted
to confirm these results.
