Abstract
In the studies of Heywang, Bird and Altschul (1955), an appreciable number of eggs held in commercial cold storage for about six months had yolks with dark discolorations when laying White Leghorns were fed diets containing raw cottonseed, or screw-press, hydraulic, or solvent-extracted cottonseed meal as the source of as little as .001 percent free gossypol. Present information indicates that free gossypol was responsible for the dark discolorations.It seemed desirable to determine whether dark discolorations would appear when dietary levels of free gossypol lower than .001 percent were fed. Accordingly, in two separate experiments laying White Leghorn pullets were fed for 30 days diets containing raw decorticated cottonseed or screw-press cottonseed meal as the source of free gossypol at the dietary levels of .00025, .00050, .00075, and .0010 percent.Each diet containing the seed was fed to 10 trap-nested layers on straw litter in similar pens, and each diet …
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