Discolorations in Stored Eggs When Layers at Two Locations Were Fed Cottonseed Meals Made from Glandless and Glanded Seed

Cottonseed Meal for Poultry: from Research to Practical Application

“…That "bound" gossypol in cottonseed meal can contribute to yolk discoloration has been suggested by two recent reports (Heywang and Vavich, 1965a;Heywang et al, 1965).…”

“…1962Kemmerer et al, ( , 1963 showed that olive yolk discoloration could be induced by feeding the cottonseed pigment gossypol, believed to be present in all cottonseed meal now produced. A great many reports, some of which are listed, have indicated that feeding of cottonseed meal to laying hens can result in dark yolk discoloration (Schaible et al, 1934;Swensen et al, 1942;Brant and Carver, 1947;Heywang, 1947Heywang, , 1957aHeywang, , 1957bHeywang et al, 1949Heywang et al, ,1963Heywang et al, ,1965Fletcher et al, 1953;Heywang and Lowe, 1959;Frampton et al, , 1962Vavich, 1965a, 1965b). The latter two reports and an earlier paper by Heywang (1947) showed that selected cottonseed meals produced satisfactory fresh eggs, and additional reports indicated satisfactory yolk color after the eggs were cold stored for six months (Stephenson and Smith, 1952;Heywang et al, 1961;Kemmerer and Heywang, 1965).…”

“…Cottonseed free of gossypol is being developed and the meals produced from the glandless seed have given encouraging results with both layers Vavich, 1965a, 1965b;Heywang et al, 1965) and chicks (Johnston and Watts. 1 964).…”

“…Egg production was brought to a stop by 1500 ppm (0.15%) free gossypol in the ration. Heywang et al, (1965) reported that 480 ppm (0.048%) and greater levels of experimental cottonseed meal gossypol decreased egg production. On the other hand a recent report by Heywang and Vavich (1965b) showed no significant differences in egg production when a ration containing 16.5 per cent of a commercial cottonseed meal was compared with a soybean meal control ration.…”

The Effect of Cottonseed Products and Selected Feed Additives on Egg Yolk Discoloration

“…Upon testing cottonseed meal produced from glanded and glandless cottonseed, Heywang et al (1965) found that meal from glanded cottonseed produced a high incidence of mottled yolks while that from the glandless seed produced only limited mottling and in some cases no mottling. Thompson et al (1930) found no evidence to show that gossypol was the factor involved in the discoloration of yolks of eggs from hens being fed rations containing cottonseed meal.…”