Effects of organic acid in broiler feeds on fattening performance and intestinal microbiology

Thesis Type: Doctorate

Institution Of The Thesis: Uludağ Üniversitesi, Turkey

Approval Date: 2008

Thesis Language: Turkish


Supervisor: GÜLAY DENİZ


This research is done in order to determine the effects of the organic acids supplemented to broiler diets as an alternative to antibiotic growth promoters; the effects can be observed on body weight, body weight gain, feed consumption, feed conversion ratio, hot carcass weight and dressing percentage which are fattening performance parameters and also small intestine weight, pH and microbiology.During the trial, a total of 300 one day old Avian Farm broiler male chicks were used. The chicks were randomly divided into 3 main groups (control, organic acid and avilamycin), each with 5 replicate groups containing 20 chicks. The trial was lasted in 41 days. During the trial all the groups were fed with broiler starter (0-21st days), broiler grower (22nd-35th days) and broiler finisher (36th -41st days) diets as ad libitum.Where no supplementary were put into the control group?s diet, the organic acid group was given 2 g/kg organic acid combination (Lunacompacid® Herbex Dry) and the avilamycin group was given 10 mg/kg avilamycin (Kavimix Maxus®-10) supplementary to their diet.At the end of the trial the organic acid and the avilamycin supplements were not significantly affect the dietary performance parameters such as body weight, body weight gain, feed consumption, feed conversion ratio, carcass weight and mortality. However the avilamycin supplemented group showed lower small intestine weight than the control and organic acid groups (P<0.05). Where there was no difference between the control and avilamycin group on account of small intestine pH level, the organic acid group showed a signficantly lower level of pH than the control group (P<0.05). The number of sulfite reducing anaerob bacteria in the avilamycin group (P<0.05) and the organic acid group (P<0.001) significantly dropped when compared to the control group. At the same time the Cl. perfringens number was found significantly low in the organic acid and avilamycin groups (P<0.001) compared to the control group.At the end of the trial the significant reduction in the number of pathogen microorganism and small intestine pH level shows us that the use of the organic acids supplemented into broiler diets as an alternative to the antibiotic growth promoters can effect both animal and consumer health positively.