Abstract 156

Lennerts,-L

Muhle-+-Mischfuttertechnik. 1988, 125: 39, 504-505.

Nutritive value of cottonseed products depends on proportions of husks and lint. Undecorticated cake/expeller and oilmeal contained about 17 to >20% digestible crude protein and 400 (oilmeal) to 450 starch units/kg. Husk-free material is not commercially available. Protein of partly decorticated material contained 4.5% lysine, with high values also for cystine, methionine, arginine, leucine and phenylalanine. In husk-free products crude fibre and crude protein reached 3 and >50% and in undecorticated, with 55% husks, about 25 and 24%. Partly decorticated oilmeal contained over 1% phosphorus and undecorticated cake/expeller and oilmeal 0.68 and 0.96%. With increasing husk content magnesium and potassium tended to decrease. Products were rich in iron with fair amounts of manganese, copper, iodine and cobalt. Levels of B vitamins are shown for decorticated material. Availability of nutrients is discussed. In 24 commercial products total gossypol ranged from 0.53 to 0.95 and free gossypol from 0.06 to 0.18%. Suitable cottonseed levels in diets for cattle in particular, also sheep and goats, and problems for pigs, calves and poultry are examined.