The National Research Council1-4-1 recommends that the commercial egg layer have a daily intake of 250 mg of nonphytate phosphorus. They recommend 350 mg intake for the broiler breeder hen, but indicate that adequate data are not available to support this recommendation.
Most nutritionists formulate the feed for a commercial egg layer to furnish considerably more than the recommended 250 mg. The Florida researchers recommended a decreasing intake of 650, 550, and 450 mg of total phosphorus as the hen aged. The highest level of phosphorus was recommended for the first 16 weeks of lay, for prevention of cage layer fatigue. Lowering the phosphorus after 53 weeks of lay is for the improvement of eggshell quality. Recently, the trend has been to feed lower levels of phosphorus. This is a result of the emphasis on decreasing the level of phosphorus in the environment.
and yellow corn. Other sources of pigment were later obtained from marigold flowers. In 1957, pure carotenoid substances were synthesized. The use of beta-apo-81 carotenoid produced a pleasing yellow color, but cantha-xanthin produced an orange-to-red color that was not acceptable. It was reported that different combinations of these compounds could be used to produce any desired color. These researchers suggested that desired yolk color could be produced by blending feeds with known xanthophyl concentrations.
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