DIETARY EFFECT OF PROBIOTICS AND ANTIBIOTIC ON PRODUCTIVE PERFORMANCE AND FAECAL MICROBIAL STATUS ON LAYING HEN

Abstract

The study was carried out to assess, examine and quantify the effect of Probiotics (Protexin, Exolution) and Antibiotic (Renamycin) supplementation on egg production performance and microbial load of laying hens at the latter stage (56-63weeks) of production. The study was conducted at the poultry farm and Microbiology laboratory, Hajee Mohammad Danesh Science and Technology University (HSTU), Dinajpur. Total 48 Hisex Brown hens of 56 weeks old were allocated to 4 treatments with 3replications, each containing 12 hens. The hens in individual cages were supplied feed 120 g/b/day (not fixed) containing 18.21% CP and 2762.21 ME KCal/kg diet. Laying hens were randomly allotted to 4 dietary treatments T0 (control), T1 (Protexin-30gm/100kg of feed), T2 (Exolution--60gm/100kg of feed), T3 (Renamycin -100gm/100kg of feed).There were no significant effect on body weight shown after the experiment. Egg production was more or less similar at first few weeks, but at later stage results showed increased production in T1 and T2 Treatment than the control T0. The egg weight was gradually increased in T2 (67.84g in 8th week) treatment group. The highest egg weight was found in T2 (67.84 gm). The feed intake of laying hens in different dietary treatments during experimental period was almost similar .The feed efficiency(FE) in different dietary treatments were statistically significant and the best FE was found in T2 (1.75 in 5th week) treatment group .Other treatment group like T1, T3 have also better FE than that of control group. Supplementation of Protexin, Exolution and Renamycin in the diets significantly decreased the population of harmful bacterium, Escherichia coli, and total culturable bacteria than those of control.