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Phosphorus Characteristics of Dairy Feces Affected by Diets

^a Center for Animal Health and Productivity, School of Veterinary Medicine, Univ. of Pennsylvania, 382 West Street Road, Kennett Square, PA 19348
^b Dep. of Dairy Sci., Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061
^c Dep. of Animal and Avian Sciences, Univ. of Maryland, College Park, MD 20742
^d U.S. Dairy Forage Research Center, Madison, WI 53706
^e Soil Science Institute, Chinese Academy of Sciences, Nanjing, China

View larger version (23K): [in a new window]   Fig. 1. Acid digest total P in fecal samples affected by diets in feeding Trial A over first 11 wk in lactation and Trial C over 26 wk in lactation. Vertical bars are means + one standard error.

View larger version (23K): [in a new window]   Fig. 2. Phosphorus fraction affected by diets through sequential extraction procedures: a complete fraction distribution with samples collected in Week 7 of lactation (Trial A), and the water fractions for selected samples in Trials B and C. Vertical bars are means + one standard error.

View larger version (26K): [in a new window]   Fig. 3. Water-soluble vs. nonsoluble P concentrations in dairy feces from three independent feeding trials with varying dietary P concentration.

View larger version (23K): [in a new window]   Fig. 4. Inorganic P concentrations determined in water extracts of fecal samples (1-h shaking and filtering) collected from feeding trials featuring early lactation (Trial A), or throughout a complete lactation (Trial C). Vertical bars are means + one standard error.

View larger version (15K): [in a new window]   Fig. 5. Phosphorus release pattern through repeated water extraction. Samples were collected in Week 7 post-calving from grouped cows fed three diets containing different P concentrations (Trial A). Vertical bars are means + one standard error.

View larger version (22K): [in a new window]   Fig. 6. Fecal P components (unavailable dietary P, inevitable P loss, and regulated P) as a function of dietary P concentrations (Spiekers et al., 1993). Superimposed stars represent inorganic P values measured in water extracts of fecal samples from three independent feeding trials, illustrating a similar trend and relative magnitude of the regulated P fraction.