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Importance of Phosphorus

Importance of Phosphorus. One of the most important minerals required by livestock and poultry. Complexes with calcium to give rigidity to bones. An integral part of many organic compounds – plays important roles in energy and protein metabolism.

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Importance of Phosphorus

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  1. Importance of Phosphorus • One of the most important minerals required by livestock and poultry. • Complexes with calcium to give rigidity to bones. • An integral part of many organic compounds – plays important roles in energy and protein metabolism. • Almost every biochemical reaction that occurs in muscle, blood and other soft tissues involves phosphorus. • Affects protein synthesis, lean deposition in growing animals.

  2. Phosphorus Requirements • Best source of unbiased information on requirements is the nutrient requirement publications of the National Research Council (NRC). • NRC is part of the National Academy of Sciences – a private organization established 140 years ago by President Abraham Lincoln to advise the nation on issues of science and technology. • The Committee on Animal Nutrition of the NRC has established guidelines for feeding animals for past 75 years.

  3. Nitrogen and Phosphorus in Animal Manures N P (% of DM) Manure from: Swine 4.71 2.97 Poultry 5.13 1.62 Beef 3.96 1.07 Dairy 3.75 0.79 Sheep 3.89 0.56 Sweeten (1992).

  4. Swine and Poultry Manure High in Phosphorus - Why? • Diets (especially swine diets) generally tend to be oversupplemented with phosphorus. • Grains, oilseed meals in swine and poultry diets are high in phytate phosphorus. • Pigs and poultry are unable to degrade phytase and utilize the phosphorus - no phytase in their digestive tract. • As a result, most of dietary phosphorus from the natural ingredients is excreted in the feces.

  5. O O O- -O P P -O O- O O -O O- O O P P O O O- -O O O- O -O P P -O O- O O Phytic Acid – The Culprit

  6. Ca++ O O O- -O P P Zn++ -O Cu++ O- O O -O O- O O P P O O O- -O O O- O -O Zn++ Mg++ P P -O O- O O Fe++ Phytate Phosphorus

  7. Phytate Phosphorus Content of Cereal Grains, Byproducts, and Oilseed Meals Phytate Phosphorus % of total P % of total P Barley 56 Wheat bran 70 Oats 56 Wheat middlings 74 Corn 66 Wheat 67 Soybean meal 61 Grain sorghum 68 Cottonseed meal 70 Sesame meal 81 Nelson et al. (1968).

  8. Nutritional Strategies to Reduce Phosphorus in Swine Manure • Feed diets that are not excessive in phosphorus. • Formulate diets on an “available phosphorus” basis. • Use feedstuffs that are low in phytate or that have endogenous phytase. • Wheat, wheat byproducts, triticale, barley. • Reduce dietary phosphorus and supplement with phytase. • Use low-phytate cereals and oilseed meals.

  9. Model-Predicted P Excretion (kg) in Growing-Finishing Pig Fed Corn-Soy Diet from 20 to 120 kg 79% More P Excreted

  10. Phytase – What Does it Do? • Increases phytate digestibility - increases bioavailability of P in cereal grains and oilseed meals. • Reduces the amount of supplemental inorganic P needed to maximize growth and bone mineralization. • Markedly reduces fecal P excretion. • Increases the absorption of Ca, Mg, Zn, and other divalent cations. • May improve the utilization of dietary protein and energy.

  11. Low-Phytate Corn

  12. Forms of Phosphorus in Germ of Normal and Mutant lpa1 Corn Other Organic P Inorganic P Phytic Acid P Raboy et al. (1990)

  13. UDP UDP-Glu UDP-Gal UDP Sucrose 2 Fructose Galactinol Myo-Inositol 3 1 ADP Glu6P Myo-Inositol Glucose + Fructose Raffinose ATP Phytic Acid Galactinol 4 1 Myo-Inositol, 1P Synthase Myo-Inositol 2 Galactinol Synthase Stachyose Raffinose Synthase 3 Stachyose Synthase 4 Soluble Carbohydrates in Soybean Sucrose

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