Effect of Lactobacillus acidophilus and zinc bacitracin as dietary additives for broiler chickens.

The influence of Lactobacillus acidophilus and zinc bacitracin alone, or in combination, on the growth of broiler chickens was monitored over a period of 8 weeks. 2. The maximum improvement in body weight over the controls was 10.8% with both additives in the diet but the use of bacitracin alone induced a 9.1% improvement. 3. Food conversion was reduced by zinc bacitracin alone but was improved by the use of L. acidophilus and bacitracin in combination. 4. The combination treatment increased abdominal fat deposition in the female chickens by 31%.