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Related Concept Videos

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Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
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Roles of Electrolytes: Calcium and Phosphate01:27

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Calcium and phosphate are essential electrolytes in the human body, with calcium being the most abundant mineral. Around 99% of the body's calcium is stored in the skeleton and teeth, forming a crystal lattice of mineral salts in combination with phosphates. Calcium plays crucial roles in various bodily functions such as blood clotting, neurotransmitter release, muscle tone maintenance, and nervous and muscle tissue excitability.
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The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
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A Protocol for Collecting and Constructing Soil Core Lysimeters
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Phosphorus excretion by mares post-lactation.

Ashley L Fowler1, Morgan B Pyles1, Susan H Hayes1

  • 1Department of Animal and Food Sciences, University of Kentucky, Lexington, Kentucky.

Journal of Animal Physiology and Animal Nutrition
|November 14, 2019
PubMed
Summary
This summary is machine-generated.

Equine phosphorus (P) digestibility varies widely due to endogenous P secretion. Post-lactational mares did not show improved P retention, suggesting metabolic factors influence P excretion.

Keywords:
digestibilityendogenous phosphorus lossequinelactationphosphorus excretion

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Area of Science:

  • Animal Nutrition
  • Equine Physiology
  • Digestive Physiology

Background:

  • Phosphorus (P) digestibility in horses shows significant variation, unexplained by intake alone.
  • Endogenous P secretion into the gastrointestinal tract is a key factor influencing fecal P excretion.
  • Accurate P digestibility assessment requires considering P retention, as excess absorbed P is re-secreted in horses.

Purpose of the Study:

  • To investigate P digestibility in post-lactational mares compared to control mares.
  • To test the hypothesis that post-lactational mares exhibit greater P retention and apparent digestibility.
  • To explore the role of endogenous P secretion in explaining P digestibility variations.

Main Methods:

  • Comparative study involving post-lactational and control mares.
  • Controlled feeding of diets meeting non-lactating mare P requirements.
  • Monitoring of P intake, fecal excretion, and body weight changes.

Main Results:

  • Post-lactational mares did not retain more P than control mares.
  • A trend (p=0.082) indicated higher P excretion in post-lactational mares, suggesting increased endogenous secretion.
  • Both groups exhibited negative P balance (fecal P > intake P) and weight loss.

Conclusions:

  • Post-lactational status and associated metabolic changes may increase P excretion.
  • Weight loss and tissue mobilization can influence endogenous P secretion.
  • Further research is needed to fully elucidate factors affecting P homeostasis in mares.