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Pages 9-14

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From page 9...
... These develop- ogy, and veterinary medicine, with diverse expertise and ments include the following: perspectives on the impact of nutrition on the health of fish, poultry, livestock, companion animals, and humans. • Improvements in the sensitivity and specificity of analysis of mineral concentrations in feeds and animal tissues; COMMITTEE CHARGE AND APPROACH • New information on the bioavailability, homeostasis, The committee was given the following task: "An ad hoc and mechanism of toxicity of minerals; committee of the standing Committee on Animal Nutrition • New understandings of appropriate indices of animal will be convened to conduct a thorough review of the scienhealth and well-being; tific literature on trace elements and macro minerals, includ • Increased disposal of municipal and animal wastes on ing an analysis of the effects of exposure and toxic levels in crop lands and pastures, potentially resulting in greater ex- animal diets; provide recommendations on animal tolerances posure of animals to certain minerals; and toxic dietary levels, and identify elements that pose po 1
From page 10...
... However, specific biochemical functions diets including the following areas: general considerations; have not been identified for these six, and there is not a conmineral sources, discrepancies and difficulties in methods of sensus among nutritionists that these minerals are essential. analyses and evaluation of biological status; metabolic mineral interactions; assessments of form and species interac EXPOSURE tions; supplementation considerations; bioavailability of different mineral forms and sources; maximal tolerable levels; Animals may be exposed to toxic levels of minerals from and effects of diet composition, stressors, and animal physi- a wide variety of sources.
From page 11...
... . determine the bioavailability of the mineral sources include Tolerable mineral levels are typically distinguished from the solubility of a mineral compound in the digestive tract, toxic levels in experiments that use incremental additions of its valence state, and whether the mineral is in an organic,
From page 12...
... Third, • Eight minerals as being of occasional concern for ani- the maximum concentrations in animal tissues were commal toxicosis: arsenic, boron, bromine, calcium, iron, potas- pared to levels known to be safe for humans. Individual chapsium, phosphorus, and zinc; ters in this report provide information on the dose–response • Sodium chloride and nine minerals as being of frequent relationship between feed mineral levels and tissue levels.
From page 13...
... Information on mineral accumulation in tissues followin knowledge that would benefit from further research. The ing lifetime exposure to minerals is needed to evaluate tissue individual chapters fairly consistently highlight three main residue levels and impacts on human health.
From page 14...
... bSimilar: Recommended Maximum Tolerable Levels for poultry and livestock in this report are not appreciably different than in the 1980 report; Decreased: Recommendations in this report are lower than the previous recommendations; Increased: Recommendations in this report are higher than the previous recommendations; New: Mineral was not reviewed in 1980 or no recommendation was provided. cMTL changed due to new information.

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