産卵鶏におけるリンとカルシウムの代謝に関する研究-1-

概要

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These experiments were planned to investigate the proper requirements, or the percentage of mixing phosphorus for laying hens. Also, the amount of metabolism of the phosphorus were measured for these purposes.Five White Leghorn hens were operated to attach the artificial anus and they were confined to the experimental metabolic cages, individually. The experiments were started when the hens had recovered to the normal rate of egg production. The experimental diets were made by addition of CaCO3 and CaHPO4•2H2O to the all-vegetable-source basal diet. All the diets contained 2.75 per cent of calcium with varied levels of phosphorus, i. e., 0.47%, 0.58%, 0.81% and 0.91%, respectively. Each hen was fed for preliminary test and then fed experimental diet for at least 7 days.Under these conditions, the rate of egg production, the amount of phosphorus and calcium intakes, and those excreted in the urine and feces were comparatively discussed.As a result of these experiments, it was made clear that the balance of the closest to the ±0 line was the middle of 0.58% and 0.81% in phosphorus. From these facts, it was found that the proper requirement of phosphorus for caged White Leghorn hens, when their rate of egg production was normal, were about 0.70 per cent.
社団法人日本畜産学会の論文