Effects of Dietaries with Two Rice Husk Charcoals on Egg Qualities and Feces Smell in an Ecological Poultry Experiment

抄録

The bad smell pollution from livestock farms becomes the social problem. As the experiment was done for the reduction of bad smell in a poultry production, the effects of dietary added 1% rice husk charcoal to 372-day-old laying hen were found that the ammonia gas densities on their feces as bad smell in the poultry farm was reduced almost by a half and the eggshell strength was slightly improved. This rice husk charcoal (RHC) was expensive at the price of 208 yen per kg as a manufactured product. It is ecologically necessary to investigate the effects of farmer made rice husk charcoal (FRHC), being a low cost. In this experiment, 1% and 3% of RHC and FRHC were added into the formula feed at inner percents. Effects of both 1% and 3% RHC and FRHC dietaries to each 22 laying hens (451-day-old) were investigated in comparison with Non RHC dietary. The egg production rate during the test was indicated that 1% FRHC and 1% RHC dietaries increased but 3% FRHC and 3% RHC dietaries decreased than Non RHC dietary. However, the ammonia gas densities on their feces was significantly reduced 21-44% in 1% and 3% RHC dietaries and also 21-25% in 1% and 3% FRHC dietaries at 5-6 weeks in comparison with Non RHC dietary, and was also significantly reduced in 1% RHC dietary at 2-6 weeks continuously.