A study on infectious bursal disease virus(IBDV)on chickens of Cobb-500 strain broiler breed at Thakurgaon district of Bangladesh was performed.The protective antibody was measured on one day old chicks(DOC)and post-v...A study on infectious bursal disease virus(IBDV)on chickens of Cobb-500 strain broiler breed at Thakurgaon district of Bangladesh was performed.The protective antibody was measured on one day old chicks(DOC)and post-vaccinated(PV)flocks up to 75 weeks by indirect enzyme linked-immunosorbent assay(I-ELISA).The assays have included five flocks with vaccination historic against IBDV contained 45,000 birds with age ranging from DOC to 75 weeks,just before culling.Maternally derived antibody(MDA)mean titer(MT)ranged from 3,395 to 5,184.The antibody from serum samples(N=92 per flock)were titer tested by I-ELISA at age 14 d,5,8,23,50 and 75 weeks of each vaccinated flock.Antibody titer level gradually decreased before vaccination.Vaccination done by intermediate plus vaccine resulting titers level was increased and stayed at the same level.The antibody MT at the 14th day was 500,which supported Deventer method.The protective antibody MT was declined at growing,laying,mid laying and last stage of laying groups.So MDA titer was enough in offspring that could protect birds easily.展开更多
This study aims to evaluate and compare the fertilizing effects of fish-breeding water and river water combined or not with composted poultry manure on the growth and production of okra and lettuce crops. Thus, a samp...This study aims to evaluate and compare the fertilizing effects of fish-breeding water and river water combined or not with composted poultry manure on the growth and production of okra and lettuce crops. Thus, a sample of 2000 Nile tilapia Oreochromis niloticus fry and a sample of 100 Cobb 500 strain chicks were reared and monitored for six months and fifteen days. Poultry manure and fish-breeding water were then collected and used to fertilize and water okra and lettuce crops. Two systems were used for the crops (okra and lettuce) tested in an elementary plot design with replicates for each treatment (T1: fish-breeding water alone;T2: river water alone;T3: fish-breeding water combined with manure;T4: river water combined with manure). Morphometric parameters and phenological traits of okra and lettuce crops as well as the total harvest weight and production yield were evaluated and compared between treatments. The results reveal better growth and higher yields (0.67 kg/m<sup>2</sup> vs. 0.45 kg/m<sup>2</sup>) of okra crops that received treatment T1 compared to T2. The best growth and yields of lettuce were obtained with treatments T3 (3.34 kg/m<sup>2</sup>) and T1 (1.89 kg/m<sup>2</sup>) compared to T4 (1.23 kg/m<sup>2</sup>) and T2 (1.20 kg/m<sup>2</sup>). These results show that fish-breeding water combined with poultry manure can boost okra and lettuce production and would be a real asset to stimulate local agricultural development. Thus, the adoption of such an agro-ecological approach integrating fish farming and animal husbandry could increase local production and provide food of good nutritional quality.展开更多
文摘A study on infectious bursal disease virus(IBDV)on chickens of Cobb-500 strain broiler breed at Thakurgaon district of Bangladesh was performed.The protective antibody was measured on one day old chicks(DOC)and post-vaccinated(PV)flocks up to 75 weeks by indirect enzyme linked-immunosorbent assay(I-ELISA).The assays have included five flocks with vaccination historic against IBDV contained 45,000 birds with age ranging from DOC to 75 weeks,just before culling.Maternally derived antibody(MDA)mean titer(MT)ranged from 3,395 to 5,184.The antibody from serum samples(N=92 per flock)were titer tested by I-ELISA at age 14 d,5,8,23,50 and 75 weeks of each vaccinated flock.Antibody titer level gradually decreased before vaccination.Vaccination done by intermediate plus vaccine resulting titers level was increased and stayed at the same level.The antibody MT at the 14th day was 500,which supported Deventer method.The protective antibody MT was declined at growing,laying,mid laying and last stage of laying groups.So MDA titer was enough in offspring that could protect birds easily.
文摘This study aims to evaluate and compare the fertilizing effects of fish-breeding water and river water combined or not with composted poultry manure on the growth and production of okra and lettuce crops. Thus, a sample of 2000 Nile tilapia Oreochromis niloticus fry and a sample of 100 Cobb 500 strain chicks were reared and monitored for six months and fifteen days. Poultry manure and fish-breeding water were then collected and used to fertilize and water okra and lettuce crops. Two systems were used for the crops (okra and lettuce) tested in an elementary plot design with replicates for each treatment (T1: fish-breeding water alone;T2: river water alone;T3: fish-breeding water combined with manure;T4: river water combined with manure). Morphometric parameters and phenological traits of okra and lettuce crops as well as the total harvest weight and production yield were evaluated and compared between treatments. The results reveal better growth and higher yields (0.67 kg/m<sup>2</sup> vs. 0.45 kg/m<sup>2</sup>) of okra crops that received treatment T1 compared to T2. The best growth and yields of lettuce were obtained with treatments T3 (3.34 kg/m<sup>2</sup>) and T1 (1.89 kg/m<sup>2</sup>) compared to T4 (1.23 kg/m<sup>2</sup>) and T2 (1.20 kg/m<sup>2</sup>). These results show that fish-breeding water combined with poultry manure can boost okra and lettuce production and would be a real asset to stimulate local agricultural development. Thus, the adoption of such an agro-ecological approach integrating fish farming and animal husbandry could increase local production and provide food of good nutritional quality.
