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Interrelationship between environmental temperature and dietary nonphytate phosphorus in laying hens
- Source :
- Poultry Science. 82:1763-1768
- Publication Year :
- 2003
- Publisher :
- Elsevier BV, 2003.
-
Abstract
- Four experiments were conducted to evaluate the effects of phosphorus nutrition on laying hens exposed to heat stress (HS). Hens were fed their respective diet for at least 3 wk prior to initiation of each experiment to allow the hens fed low-P diets to become P deficient. In most experiments, hens housed in non-HS conditions were pair-fed to the HS hens to maintain equal feed intake. In experiments 1 and 2, two levels of nonphytate P (NPP; deficient at 0.10 or 0.16% vs. control at 0.45%) and two temperatures (constant thermoneutral at 21 degrees C or cyclic HS up to 35 degrees C) were evaluated. Low NPP significantly reduced feed intake and hen-day egg production, but the cyclic heat treatment had no effect on hen performance. Experiment 3 was similar to experiments 1 and 2 except that constant HS was implemented. Both constant HS and low dietary NPP reduced feed intake and egg production, and there was no significant interaction between HS and dietary NPP level. In experiment 4, hens were fed 0.10 or 0.45% NPP diets and exposed to a more severe HS (38 degrees C) for 8 h. Hens fed the deficient NPP level showed a 16% incidence of severe heat distress (unable to stand, unresponsive). Our results generally indicated that there was no interaction between dietary NPP level and HS in laying hens. However, subjecting hens that had been fed a P-deficient diet to an acute HS of 38 degrees C did increase the incidence of severe heat distress.
- Subjects :
- Hot Temperature
animal structures
Oviposition
chemistry.chemical_element
Environment
Biology
Crossbreed
Animal science
Environmental temperature
Stress, Physiological
medicine
Animals
Phosphorus
Nutritional Requirements
Temperature
General Medicine
Heat stress
chemistry
embryonic structures
Phosphorus, Dietary
Animal Nutritional Physiological Phenomena
Female
Animal Science and Zoology
medicine.symptom
Chickens
Weight gain
Subjects
Details
- ISSN :
- 00325791
- Volume :
- 82
- Database :
- OpenAIRE
- Journal :
- Poultry Science
- Accession number :
- edsair.doi.dedup.....fcddaa45b7a680924c0f6ed863b7190d