Phosphorous requirements of laying hens in a semiarid continental climate

Single Comb White Leghorn layers raised in floor pens in conventional open housing were used to determine their phosphorous requirement in a semiarid continental climate. Dietary available phosphorous (AP) of .15, .25, .35, and .45% were fed continuously from 26 to 74 weeks of age. Concurrently, die...

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Bibliographic Details
Published in:Poultry science 1985-07, Vol.64 (7), p.1382-1384
Main Authors: Daghir, N J, Farran, M T, Kaysi, S A
Format: Article
Language:English
Subjects:
Animal Feed
Animals
Body Weight
Chickens - metabolism
Chickens - physiology
Climate
Eggs
Female
Lebanon
Nutritional Requirements
Oviposition
Phosphorus - metabolism
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Summary:Single Comb White Leghorn layers raised in floor pens in conventional open housing were used to determine their phosphorous requirement in a semiarid continental climate. Dietary available phosphorous (AP) of .15, .25, .35, and .45% were fed continuously from 26 to 74 weeks of age. Concurrently, diets containing .45, .35, and .25% AP or .35, .25, and .15% AP were "phase fed" during the age intervals of 26 to 42, 42 to 54, and 54 to 74 weeks, respectively. Diets used were corn-soybean diets in which the phosphorous was varied by changing the level of dicalcium phosphate in the ration. Under the conditions of this experiment, hens required a minimum of .25% AP for best egg production, feed consumption, and body weight gain. The AP levels above .35% depressed shell thickness. In a phase-feeding program, when the last phase corresponds with the summer season, AP should not go below .25% for best performance.
ISSN:0032-5791
DOI:10.3382/ps.0641382