AMMONIA EMISSION FROM OPEN SIDED BROILER HOUSES WITH DIFFERENT REARING SYSTEMS AND ITS IMPACT ON BROILER PRODUCTION

Abstract

The demand for poultry products in Bangladesh has grown significantly. Poultry sector needs to increase significantly to meet the growing domestic demand. However, atmospheric ammonia inhibits broiler performance. Therefore, a study was planned to investigate the effects of ammonia emission from different types of broiler houses and its impact on productivity. A total of 135 day-old Lohmann broiler chicks were reared at SAU Poultry Farm, Dhaka-1207. Chicks were divided randomly into 3 experimental groups of 3 replications R 1 , R 2 and R 3 , where each replication contains 15 birds. These three treatment groups were designated as T 0 indicated without ceiling fan. Whereas T 1 , T 1 and T 2 and T 2 . T 0 was control group which were ceiling fan and ceiling fan with exhaust fan, respectively. Results demonstrated that the average ammonia level was same at the end of 1 st week, however it varied significantly (P<0.05) at the end of 2 , 3 rd and 4 th week. The control group (T 0 ) indicated the highest ammonia emissions at the end of 2 nd , 3 rd and 4 th week and T 2 showed the lowest ammonia emissions at the end of 2 nd , 3 rd and 4 th week. At the end of 4 th week significantly (P<0.05) higher emissions of ammonia was found in control group T 0 (11.63 a ±0.17 ppm) and lower was found in treated group T 2 (6.53 c ±0.14 ppm). BWG (Body Weight Gain), BW (Body Weight) and FCR at the end of 4 th week were insignificant (P>0.05) in different group, however better BWG, BW and FCR were found in treated group T 2 (BWG 1812.33±26.82 gm, BW 1852.76±26.82 gm,

FCR 1.31±0.04). Dressing percentage was non significantly (P>0.05) higher in T 1 (65.10±1.05) and T 2 (65.72±0.35) than control group T 0

(64.33±0.48). The weight of spleen and gizzard in exhaust fan treated group T 2 was significantly higher (P<0.05) than control group (T 0 ). The weight of thigh, drumstick and back in exhaust fan treated group T 2 was non significantly higher (P>0.05) than control group (T 0 ). Survivability rate (%) of the chicken was significantly higher (P<0.05) in T 2 and T 1 group than control group (T 0 ). In case of cost benefit ratio analysis, BCR was significantly (P<0.05) higher in treatment group T 1 T 2 (1.35±0.01) than T 0 (1.35±0.01)

(1.30±0.02). Therefore, the research recommended that poultry house with exhaust fan at bird’s level could be used on broiler production for better performance and profitability. nd and