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Blood Phosphorus Levels of Laying Hens at Various Time Intervals after Dosing with Phosphoric Acid¹

Department of Poultry Science, Florida Agricultural Experiment Station, Gainesville, Florida 32611

Two experiments were conducted to study the pattern of change in serum inorganic phosphorus level in laying hens fed a diet containing 0.30% total phosphorus after dosing with a known amount of phosphorus. Serum phosphorus level of undosed hens was 2.5 mg/100 ml at oviposition in both experiments. After dosing with 100 mg of phosphorus in 10 ml of a phosphoric acid solution, serum phosphorus level increased sharply and reached a peak of about 7.0 mg/100 ml between 30 and 60 minutes in experiment 2. After the peak the elevated level of serum phosphorus decreased logarithmically until 5 to 6 hours after dosing and eventually decreased to 2.5 mg/100 ml which was the serum phosphorus level of undosed hens in experiment 1. The half-life of the elevated portion of serum phosphorus due to the dosing was about 100 minutes.

KEY WORDS: • blood phosphorus • laying hens • phosphoric acid dosing

¹ Fla. Agr. Exp. Sta., Journal Series No. 1108.

Manuscript received 18 May 1978.