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  1. Absorption: The process of taking substances, such as nutrients or minerals, into the body through the digestive tract. For calcium, specifically the absorption of Ca from the small intestine.

  2. Adipose Tissue: Body fat, where fat-soluble vitamins can be stored.

  3. Ammonia (NH3): A nitrogenous pollutant released from livestock manure, a noxious gas contributing to air pollution and acid rain.

  4. Antioxidant: A substance that protects cells from damage caused by free radicals by donating electrons. Examples include Vitamin C, Vitamin E, and Selenium.

  5. Ascorbic Acid: Another name for Vitamin C.

  6. ATP (Adenosine Triphosphate): The primary energy currency of the cell.

  7. Beta-Carotene: Provitamin A found in plants, a precursor that the body converts to active Vitamin A (retinol).

  8. Bone Mineralization: The process of depositing calcium into bones from the bloodstream, which decreases blood calcium levels.

  9. Bone Resorption: The process of breaking down bone tissue and releasing calcium into the blood, which increases blood calcium levels.

  10. Calcitonin: A hormone produced by the thyroid gland that decreases blood calcium levels by increasing bone mineralization and decreasing calcium reabsorption from the kidneys.

  11. Calcium (Ca): A macromineral important for bones, teeth, nerve and muscle function, blood clotting, and milk production.

  12. Calories (kcal, uppercase C): Unit of energy used in pet food and human nutrition, equal to 1000 lowercase calories (1 kcal livestock).

  13. Carnitine: A compound synthesized in the body with the help of Vitamin C, which aids in the transport of fatty acids into mitochondria for energy production.

  14. Chylomicrons: Lipoprotein particles that transport absorbed lipids, including fat-soluble vitamins, from the small intestine into the lymphatic system and then to the bloodstream.

  15. Cobalt (Co): A trace mineral required by rumen microorganisms to produce Vitamin B12.

  16. Collagen: A structural protein found in connective tissues, requiring Vitamin C for synthesis, important for healthy gums, skin, and tendons.

  17. Copper (Cu): A trace mineral essential for hemoglobin production, nerve function, and immune cell proliferation.

  18. Crude Protein: Total protein content in a feed. Overfeeding can lead to increased nitrogenous pollutants.

  19. Electrolytes: Minerals (Na, K, Cl) that carry an electrical charge and are important for maintaining fluid balance, nerve impulses, and nutrient absorption.

  20. Essential Nutrient: A nutrient that an animal must obtain from the diet because the body cannot synthesize it in sufficient quantities to meet its requirements.

  21. Extracellular Fluid: Body water found outside of cells, including interstitial fluid and vascular fluid.

  22. Fat-Soluble Vitamins: Vitamins (A, D, E, K) that are absorbed with fats and stored in the body's fat tissues and liver.

  23. Phytase Enzyme: An enzyme that breaks down phytic acid, liberating phosphorus for absorption. Animals generally do not produce sufficient amounts of this enzyme.

  24. Phytic Acid: A compound found in grains and seeds that binds phosphorus, making it unavailable for absorption by monogastric animals.

  25. Free Radicals: Unstable atoms with unpaired electrons that can damage cells by stealing electrons from other atoms. Antioxidants protect against free radical damage.

  26. Grass Tetany (Hypomagnesemia): A medical condition in cattle caused by low blood magnesium concentration, often due to low magnesium in grass and/or high potassium interfering with magnesium absorption.

  27. Hardness (Water): The concentration of calcium and magnesium salts in water.

  28. Heme-Iron: Iron found in animal tissues (meat), which is more easily absorbed than non-heme iron.

  29. Hemoglobin: A protein in red blood cells responsible for transporting oxygen. Iron and copper are essential for its production.

  30. High Latent Heat of Evaporation: A property of water meaning that evaporating a small amount of water dissipates a large amount of heat.

  31. High Specific Heat Capacity: A property of water meaning that it can absorb a large amount of heat with only a small change in temperature.

  32. Hydrophobic: Tending to repel or not mix with water. Fat-soluble vitamins are hydrophobic.

  33. Hydrophilic: Tending to mix with, dissolve in, or be wetted by water. Water-soluble vitamins are hydrophilic.

  34. Hypocalcemia (Milk Fever): A medical condition in dairy cows characterized by low blood calcium concentration, often occurring around calving.

  35. Intracellular Fluid: Body water found inside of cells, making up the majority of total body water.

  36. Iron (Fe): A trace mineral essential for hemoglobin production and oxygen transport.

  37. Keratin: A structural protein, requiring sulfur and zinc for synthesis, found in hair, nails, and skin.

  38. Lactation: The process of producing milk, which increases water, calcium, and protein requirements.

  39. Limiting Amino Acids: Amino acids that are present in the lowest quantities relative to an animal's requirement, limiting protein synthesis. Supplementing these can improve overall protein utilization.

  40. Macrominerals: Minerals required in larger quantities by the body (Ca, P, Na, Mg, K, Cl, S).

  41. Metabolic Water: Water produced within the body during the metabolism (oxidation) of carbohydrates, fats, and proteins.

  42. Metabolizable Energy (ME): The energy available to the animal for maintenance, activity, growth, and reproduction after accounting for energy lost in feces, urine, and gases. Used to express energy requirements for dogs.

  43. Methemoglobin: A form of hemoglobin that cannot bind oxygen effectively, resulting from the conversion of hemoglobin by nitrite.

  44. Micelles: Small clusters of fat-soluble molecules and bile salts that aid in the absorption of lipids and fat-soluble vitamins in the small intestine.

  45. Microbial Contamination: The presence of harmful microorganisms (pathogens) in water, affecting water quality.

  46. Microminerals (Trace Minerals): Minerals required in smaller quantities by the body (Cr, Co, Cu, F, Fe, I, Zn, Mn, Mo, Ni, Se, Si).

  47. Milk Fever (Hypocalcemia): See Hypocalcemia.

  48. Nitrate (NO3-): A nitrogenous pollutant released from livestock manure, highly water-soluble and can cause water pollution. Can be converted to toxic nitrite by gut bacteria.

  49. Nitrite (NO2-): A toxic compound converted from nitrate by gut bacteria, can convert hemoglobin to methemoglobin.

  50. Non-Heme Iron: Iron found in plant sources, which is less easily absorbed than heme-iron.

  51. Nutrient Antagonism: See Mineral Antagonism.

  52. Osteoporosis: A medical condition in adult animals characterized by decreased bone density and strength, related to calcium deficiency and impaired bone mineralization.

  53. Oxidative Stress: Damage to cells caused by free radicals.

  54. Panting: A method of evaporative water loss and heat dissipation in animals through rapid, shallow breathing.

  55. Paracellular Absorption: A passive mechanism of mineral absorption that occurs between cells, moving from high to low concentration.

  56. Parathyroid Hormone (PTH): A hormone produced by the parathyroid gland that increases blood calcium levels by enhancing bone resorption and calcium reabsorption from the kidneys.

  57. pH (Water Quality): A measure of the acidity or alkalinity of water.

  58. Phosphorus (P): A macromineral essential for bones, teeth, ATP, and nucleic acid synthesis.

  59. Phytic Acid-Bound Phosphorus: Phosphorus in feed that is chemically bound to phytic acid and is largely unavailable for absorption by monogastric animals.

  60. Phytase Enzyme: See Phytase Enzyme.

  61. Potassium (K): A macromineral and electrolyte important for nerve function and nutrient absorption. High dietary K can interfere with magnesium absorption.

  62. Protein Turnover: The continuous process of breaking down and synthesizing proteins in the body. Requires protein intake.

  63. Prothrombin: A protein in the blood that is converted to thrombin, an enzyme essential for blood clotting. Vitamin K is required for this conversion.

  64. Provitamin A: See Beta-Carotene.

  65. Reabsorption: The process of returning substances, such as calcium, from the kidneys back into the bloodstream.

  66. Resting Energy Requirement (RER): The energy required by an animal for basic life processes while at rest. Used as the first step in calculating metabolizable energy requirements for dogs.

  67. Retinol: The active, biologically available form of Vitamin A.

  68. Rickets: A medical condition in young animals characterized by soft, bowed bones, caused by calcium and/or Vitamin D deficiency leading to impaired bone mineralization.

  69. Salinity (Water Quality): The total concentration of dissolved inorganic salts in water. High salinity can be toxic to animals.

  70. Scurvy: A disease caused by Vitamin C deficiency, affecting gums, skin, and tendons due to impaired collagen synthesis.

  71. Selenium (Se): A trace mineral and powerful antioxidant.

  72. Sulfur (S): A macromineral required for sulfur-containing amino acids and vitamins, and structural proteins.

  73. Sweating: A method of evaporative water loss and heat dissipation in animals through the production of sweat from sweat glands.

  74. Thermoregulation: The process of maintaining a stable internal body temperature. Water plays a critical role.

  75. Thrombin: An enzyme produced from prothrombin that is essential for blood clotting. Requires Vitamin K and calcium for its production.

  76. Trace Minerals: See Microminerals.

  77. Transcellular Absorption: An active mechanism of mineral absorption that occurs through the cells, requiring energy and transporter proteins.

  78. Transcellular Fluid: Body water found within certain organs or spaces, such as the fluid in the eye or brain and spinal cord.

  79. Urea: A waste product of protein metabolism that is excreted in urine. High protein intake leads to increased urea production and thus increased water requirement for excretion.

  80. Vascular Fluid: Body water found within blood vessels (blood).

  81. Vitamin A: A fat-soluble vitamin essential for growth, development, and vision.

  82. Vitamin B Complex: A group of water-soluble vitamins that act as cofactors for enzymes, particularly in energy metabolism.

  83. Vitamin C (Ascorbic Acid): A water-soluble vitamin and antioxidant, important for collagen synthesis, carnitine synthesis, and iron absorption.

  84. Vitamin D: A fat-soluble vitamin (D3 in animals, D2 in plants) that regulates calcium and phosphorus absorption and bone mineralization.

  85. Vitamin D3: The form of Vitamin D produced in animal skin upon exposure to UVB light.

  86. Vitamin E: A fat-soluble vitamin and powerful antioxidant.

  87. Vitamin K: A fat-soluble vitamin essential for blood clotting.

  88. Water-Soluble Vitamins: Vitamins (B complex, C) that dissolve in water and are generally not stored in significant amounts in the body, requiring daily intake.

  89. Zinc (Zn): A trace mineral important for enzyme activity, structural protein synthesis, and male reproduction.