EFFECT OF DIETARY CRUDE PROTEIN ON AMMONIA EMISSION, BLOOD PROFILE AND PRODUCTION PERFORMANCE OF BROILER

Abstract

The demand for poultry meat and their products in Bangladesh has grown significantly. Poultry sector of our country needs to increase to meet the growing domestic demand. However, atmospheric ammonia inhibits broiler performance. Therefore, a study was planned to investigate the effect of dietary crude protein on ammonia emission, blood profile and production performance of broiler. A total of 135 Day-Old Lohmann broiler chicks were reared in Sher-e-Bangla Agricultural University Poultry Farm, Dhaka-1207. Chicks were divided randomly into 3 experimental groups of 3 replications R 1 , R 2 where each replication contains 15 birds. These three treatment groups were designated as T 1

and T 3 T 2 . T 1 was high CP group containing 23% in starter phase and 22 % in grower phase. was medium CP group (21% in starter & 20 % in grower) and T 3 was low CP group (19 % in starter & 18 % in grower). Result demonstrated that the average ammonia level in T 1 , T 2 and T 3 were insignificant (P>0.05) at the end of 1 st week, however it varied significantly (P<0.05) at the end of 2 nd , 3 rd and 4 th week. Here, T 1 indicates the highest ammonia emissions (ppm) at the end of 2 nd (6.23 a ±0.03), 3 rd (8.80 a ±0.05) and 4 th (11.63a±0.17) week and T 3 showed the lowest ammonia emissions at the end of 2 nd (3.46 a ±0.03), 3 ±0.15) and 4 th (6.53 a ±0.14) week. At the end of 4 th week significantly (P<0.05) higher emissions of ammonia was found in T 1 (11.63 a ±0.17) and lower was found in T 3 (6.53 ±0.14). BWG (Body Weight Gain) and BW (Body Weight) at the end of 4 th week were significant (P<0.05) in different group. However, better BWG(g), BW(g) and FCR were found in T 1

(BWG 1885.34 a ±33.75, BW 1927.34 a ±33.75, FCR 1.35±0.02). Dressing percentage was significantly (P<0.05) higher in T 1 (70.81 a ±0.76) and lower in T 3 (66.52 a ±0.38). The weight of breast, wing, back and drumstick in T 1 and R 3 rd c (5.30 was significantly higher (P<0.05) than T 3 . Survivability of the chicken was insignificantly higher (P>0.05) in T 2 and T 3 . In case of benefit cost ratio analysis was insignificantly (P>0.05) higher in T 1 (1.35±0.02) and T 2 (1.35±0.01) than T 3 (1.33±0.02). The immune parameter (Hemoglobin, WBC, RBC) was significantly higher(P<0.05) in T 2 . The results of this experiment recommend that using the low CP concentrations may reduce performance therefore may not be advisable. On the other hand, high CP % can produce high NH 3 a than T 1 gas production which is detrimental. It should be keep in equilibrium state between high dietary CP supplementation and NH 3 gas production. Indeed, as subsequent further research is needed to identify the most accurate findings. , T 2