Call Prefix : PR-T

Call Suffix : 1984

Call Cutter : T - AnPr 1

Location : SEARCA Library

Format : TD

Publication Date : January 1984

Publication Place : Thailand

Summary : Four completely randomized designed experiments were conducted to evaluate the effects of feeding lactic acid bacteria on productive performance of broilers. Experiment 1 was to compare the performance of broilers fed with Lactobacillus casei isolated from a commercial sour milk and Streptococcus sp. (KB 108016, 108004 and 106602) isolated from chicken intestinal tract. The broiler chick received approximately 3 x 10^6- 5 x 10^6 cells/head/day from the first day until one week of age. Experiment 2 was to compare the performance of broilers fed with L• casei Streptococcus sp. KB 106602, mixed culture (L. casei and Streptococcus sp. KB 106602) approximately 3 x 10^8 - 5 x 10 ^8 cells/ head/day and 3-nitro 45 gm/ton for 7 weeks of age. At the end of this experiment the broilers were killed to determine amounts of acid-forming bacteria in caecum. Experiment 3 was to study the effects of adding commercial Lactobacillus culture, zinc bacitracin, oxytetracycline, chlortetracycline, UGF and 3-nitro on recommended dose to the broiler diet on the productive performance, hemoglobin and hematocrit value of t he broilers. Experiment 4 was to study the effects of adding commercial Lactobacillus culture, zinc bacitracin, chlortetracycline , UGF or commercial Lactobacillus culture plus one of the three growth promotants on recommended dose to the broiler diet on the productive performance of broilers. Experiment 1. The results showed the body weight gain at 5 weeks of age of broilers fed with Streptococcus sp. KB 106602 was higher than the other treatments (P<0 . 05). However, at 7 weeks of age, there was no significant difference but the productive performance of broilers fed with Streptococcus sp. KB 106602 tended to be improved. Experiment 2. At the end of t he experiment body weight gain and feed conversion rate of broilers fed with L. casei, Streptococcus sp. KB 106602, mixed culture and 3-nitro tended to be improved. Feeding of 3-nitro resulted in numerically improve body weight gain and feed efficiency,more than the other treatments. The amounts of acid-forming bacteria in caecum of control, L. casei, Streptococcus sp. KB 106602, mixed culture and 3-nitro treatment group were 2.35 x 10^5 , 7.67 x 10^6 , 1.09 x 10^7 , 9.74 x 10^6 and 1.38 x 10^7 cells/gm, respectively. Experiment 3. At 5 weeks of age t he broilers fed with 3-nitro showed significant difference in body weight gain (P<0.05) and feed conversion rate (P<0.05). However, when broilers fed diet containing commercial Lactobacillus culture or the other growth promotants at t he age of 7 weeks, body weight gain and feed efficiency were found t o be improved and no significant difference in hemoglobin and hematocrit value. Experiment 4. At the age of 3 week~ t he broilers fed with commercial Lactobacillus culture showed significant difference (P<0.05) in feed conversion rate . However, there was no significant difference but t he productive performance of broilers fed with commercial Lactobacillus culture or the other growth promotants were found to be improved. The result from these experiments indicated that lactic acid bacteria had a tendency to improve t he productive performance of broiler similar to some growth promotants and this study might be useful or further studies in order to substitute some disadvantage growth promotants with lactic acid bacteria.