Effect of Low Concentrations of Gizzerosine in Broiler Chick Diets.
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概要
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This experiment was conducted to evaluate the permissible concentration (P.C.) of gizzerosine (GIZZ) in the broiler diet. Four diets (DL-GIZZ: 0, 0.4, 0.5 and 0.6ppm) were prepared. Eighty broiler chicks were allocated to each diet and fed for 28 days. The numbers of chicks displaying the growth retardation and the total number of the days of growth retardation were as follows: the basal diet; 4 chicks, 4 days. 0.4ppm diet; 10 chicks, 10 days. 0.5ppm diet; 12 chicks, 22 days. 0.6ppm diet; 15 chicks, 19 days. The chicks fed on 0.4ppm diet showed the same trend as those on the basal diet until the 27th day of the experiment, however, 5 chicks showed growth retardation on the last day.It was impossible to estimate the P.C. of dietary GIZZ from the results of this experiment except that P.C. was less than 0.4ppm (DL). This is because it is possible that more chicks might have had a depressed performance on the 0.4ppm (DL) GIZZ diet, if the feeding was continued for more than 4 weeks, according to the duration of commercial broiler feeding. In order to determine the P.C. of GIZZ, more experiments, in which the concentration of GIZZ extending to a lower range than 0.2ppm (L) should be performed. The duration of such an experiment should correspond to practical feeding periods. It is very important to consider carefully the relationship between the dietary concentration of GIZZ and the duration of the experiment in analyzing the results.There was no statistically significant difference in the weight gains and feed intakes between the diets. However, the weight gains of the 0.4 and 0.5ppm diets were 40.3g and 26.1g respectively more than that of the basal diet, in spite of greater numbers of growth retarded chicks on both the former diets. The feed efficiencies among the diets were the same. These observations seem likely to show that there was a possibility that a small amount of GIZZ promoted the growth and the feed intake of the chicks.
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