Comparison of three feeding experiments with hens to check unknown or unexpected factor in a novel feed ingredient II. Multi-generation feeding experiments.:II. Multi-generation Feeding Experiments
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概要
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Three kinds of long-term multi-generation feeding exteriment with chicks were conducted to compare the effectiveness of the types of experiment for assessing not only nutritive value of a novel feed ingredient but also safety of the ingredient to domestic animals and poultry as well as to human beings through their product, the meat and the eggs. Results of 2 kinds of multi-generation feeding experiment out of 3 were described in this paper. The results of the rest were reported in the previous paper1).In a long-term multi-generation feeding experiment, total 1, 812 female and 505 male chicks, which were F1, F2, and F3 of the parents reported in the previous paper, were fed one of 8 experimental diets, i.e., a control and 7 diets containing of 7 samples of single cell protein, for 68 weeks with 3 hatchability tests. In a short-term multi-generation feeding experiment, total 3, 873 female and 1, 343 male chicks, which were F1-F6 of the same parent, were fed one of the 8 experimental diets for 36 weeks with one hatchability test at the end of the life-span of each generation.Statistical analyses of variance to examine the main effect of diets, A, and an interaction between diets and generations were carried out in the long- and short-term experiments. Statistical analyses of variance were also carried out to compare the performances of the chicks until 36 weeks of age in the long-term experiment and of the chicks of earlier 3 generations in the short-term experiment, and to compare those of the chicks of earlier 3 generations and of later 3 generations.The responses of the hens to a certain diet were similar regardless of the length of the life-span of one generation, generation and age of the hens. Trends of larger body weight of the hens fed Diet C and K, and of smaller body weight of those fed Diet O, and trends of larger egg weight of the hens fed Diet C, and of smaller egg size of those fed Diet O were observed.With these findings reported in this, previous and following papers together, a type of feeding experiment was recommended as a method to check the presence of unknown or unexpected injurious factor or factors in a feed ingredient.
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