Abstract
The present study aimed to find out the efficacy of a commercial probiotics supplementation to the diet on the growth performance, histological changes of the jejunal tissue and humoral immune response of broiler chickens. One hundred day old broiler chicks were randomly divided into four groups as group A (Vaccinated probiotics fed group), B (Non-vaccinated probiotics fed group), C (Vaccinated conventional fed group) and D (Non- vaccinated conventional fed group). Groups A and B were taken as experimental birds fed with commercially available feed with the addition of probiotics as per schedule whereas groups C and D were taken as control birds fed with commercial ration. At 30 days of age the birds were immunized with 0.5% of sheep RBC to determine the level of antibody production. The result revealed that the live weight gains obtained were significantly (p<0.01) increased more in experimental birds during the periods of 2 nd , 3 rd , 4 th , 5 th and 6 th week of age compare to control ones at all levels in both vaccinated and non-vaccinated birds. The broiler fed with probiotics gave a strong evidence of increasing the length of jejunal villi compared to conventional fed broiler observed. The antibody production was found significantly (p<0.01) higher in probiotics fed broiler than the control ones. Significant variations were observed in the weight of bursa and spleen due to probiotics supplementation. It was concluded that probiotics supplementation have a significant influence on growth performance, meat yield, morphological changes of intestinal wall and immune response of broiler chickens.
Highlights
Enteric diseases become an important concern to the poultry industry due to low productivity, increased mortality and public health hazard associated with contamination of poultry products destined for human consumption
Probiotics are being brought under consideration to fill this gap and already some farmers are using them in preference to antibiotics (Fuller, 1989)
Group I comprised 50 broiler chicks which belonged to Probiotics Fed Group (PFG) and the remaining in group II comprised 50 broiler chicks which belonged to Conventional Fed Group (CFG)
Summary
Enteric diseases become an important concern to the poultry industry due to low productivity, increased mortality and public health hazard associated with contamination of poultry products destined for human consumption. Acidophilus, Lactobacillus plantarum, Bacillus subtilis, Bacillus licheniformis, Pediococcus pentosaceus, Saccharomyces cerevisiae It must have rapid colonizing ability and strong foothold in the gut. One of such product available in the market of Bangladesh is probiotics commercially called BACTOSAC® claimed to have all the aforesaid properties. Immunization: Birds were vaccinated against Baby chick Ranikhet disease by BCRDV following the recommendation of the vaccine manufacturer at the age of 6th day followed by a booster dose at 24th day probiotics are used in many poultry farms. The birds were vaccinated against study is under taken to determine the efficacy Gumboro disease by Gumbo-L vaccine (ACI Limited, of probiotics brand BACTOSAC® on the growth Bangladesh) following the instruction of the performance, histological changes of the jejunal tissue manufacturer. Age of 11th day followed by a booster dose at 21st day intraoccularly
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