Effect of Inorganic Phosphate Source and Dietary Phosphorus Level on Laying Hen Performance and Eggshell Quality
| Autor: | J. M. Vandepopuliere, J. J. Lyons |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Calcium Phosphates
Feed consumption Eggs Oviposition chemistry.chemical_element Eating Egg Shell Random Allocation chemistry.chemical_compound Animal science Inorganic phosphate Animals Total phosphorus Eggshell Specific Gravity Chemistry Phosphorus Body Weight General Medicine Phosphate Phosphorus Dietary Female Animal Science and Zoology Chickens Dietary Phosphorus Specific gravity |
| Zdroj: | Poultry Science. 71:1022-1031 |
| ISSN: | 0032-5791 |
| DOI: | 10.3382/ps.0711022 |
| Popis: | Two experiments were conducted to evaluate laying hen performance when fed two sources of inorganic phosphorus. In Experiment 1, a regular and a coarse form of defluorinated phosphate and one source of dicalcium phosphate were used in diets calculated to contain either .4 or .5% total phosphorus (.2 or .3% nonphytate phosphorus). In Experiment 2, either the regular form of defluorinated phosphate or the dicalcium phosphate source was fed in diets calculated to contain either .4, .5, .6, or .7% total phosphorus (.2, .3, .4, or .5% nonphytate phosphorus). In Experiment 1, hens fed .5% total dietary phosphorus consumed more feed and produced heavier eggs (P less than or equal to .05). Hens fed the .4% dietary phosphorus level lost more weight during the experiment (P less than or equal to .05). No differences among dietary treatments existed for egg specific gravity. A significant source by level interaction occurred for the farm classification of thin-shelled, cracked, or broken eggs and for the total of these classifications. In Experiment 2, egg production, feed consumption, egg weight, and egg mass were depressed (P less than or equal to .05) at the .4% total dietary phosphorus level. Hens fed the .4 and .7% total dietary phosphorus level laid eggs with the highest and lowest egg specific gravity, respectively. This trend was inverse to the effect of these phosphorus levels on egg weights. A significant source by level interaction occurred for the farm classification of thin shell and for the total percentage of eggs with exterior defects. At the .4% total phosphorus level, the regular form of defluorinated phosphate produced eggs with a significantly greater thin shell classification than the dicalcium phosphate source. Hens fed the dicalcium phosphate source produced a higher percentage of compressed-sided and misshapen eggs. |
| Databáze: | OpenAIRE |
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