Nutritional evaluation of sunflower-seed protein products

Abstract

Defatted sunflower-seed meal, sunflower-seed protein concentrate and protein isolate were fed to protein-depleted chicks. The effect of the enrichment of meal and of protein isolate with lysine, methionine, or a mixture of both on the nutritional value was investigated. Sunflower-seed protein products are primarily limited in lysine. Food consumption, weight gain and protein/efficiency ratio reveal superior performance of lysine- and methionine-enriched meal or protein isolate, as compared to the corresponding non-enriched products. Methionine enrichment does not improve the nutritional quality and even result in inferior performance. Non-enriched protein isolate supports better growth than non-enriched meal specially at later stages of chick growth.

Effects of Chemical Dehulling of Sesame on Color and Microstructure

“…On the other hand, sesame seed contains high amounts of oxalic acid, which is present mainly in the hulls; they also contain among the highest levels of phytates found in nature. Both oxalic acid and phytates reduces the biological availability of zinc, calcium, magnesium, and perhaps iron (Taha et al, 1989). In areas where sesame seed is consumed by humans, dehulling is necessary because the hulls contain large amounts of undesirable oxalic acid and indigestible fiber, which imparts dark color to the sesame products (Inyang and Nwadimkpa, 1992).…”

Evaluation of sunflower meal as a feed ingredient in broiler chicken diets: the effect of using supplemental fat or pelleting

“…Therefore, unless the dietary energy density is Increased, the use of substantial amounts of sunflower meal in broiler diets may impair feed efficiency and in the instances of Inadequate MEn intakes, reduces growth rate (Taha et al, 1980;. Based on these reports from the literature, four experiments were designed to determine the metabolizable energy content of diets containing sunflower meal and to investigate the use of supplemental fat or diet pelleting on the nutritive value of broiler chicken diets containing sunflower meal.…”

“…The high fiber content of sunflower meal contributed, at least partly, to the growth depression of chicks since lysine supplementation did not overcome the adverse effects of sunflower meal diets on performance. In contrast, and Taha et al (1980) concluded that the adverse effects of including sunflower meal in the broiler diets could be totally overcome by lysine supplementation.…”

“…Earlier research was focused on studying the protein quality of the meal. McGlnnis et al (1948), Klaln et al (1956), Thomas et al (1965), Afifi (1972), Cuca et al (1973), and Taha et al (1980) reported that lysine is the first and threonine the second limiting amino acids in poultry diets containing sunflower meal. As in the case of swine, the response of poultry to lysine supplementation of diets containing sunflower meal has been controversial.…”

“…It is worth noting that the fiber content of sunflower meal used by Taha et al (1980) was relatively low. Also, supplemental fat was used by to increase the energy density of the diet.…”