Marginally vitamin A-deficient 1-d-old chickens capable of remaining healthy for at least 6 weeks were produced using a two-generation model. In this model, hens fed on diets with a limited vitamin A content were used to obtain 1-d-old chickens which were marginally deficient in vitamin A. Only hens with a narrow range of plasma retinol values (0.60-0.85 mumol/l) were satisfactory for this purp...

Commonly recommended plant sources of provitamin A, such as dark green leafy vegetables, are not acceptable in many population groups. The objective of this study was to identify other indigenous foods that may be effectively promoted to alleviate vitamin A deficiency (VAD) and to gather information relevant to identification, production, acquisition, and consumption of foods relevant to a food...

p ERRY et al. (1957)and Neumann (1960) reported that steers fed an all-concentrate ration developed vitamin A deficiency even though carotene was present in the diet in excess of requirements (N.R.C., 1958). Jordan et al. (1963) found similar results when steers were fed principally on corn silage. Steers fed a "high" nitrate silage were depleted of their liver vitamin A reserves more rapidly t...

purpose: to report a case of xerophthalmia after bariatric surgery. case report: a 24- year -old man presented to the eye clinic with a 4 -month history of irritable gritty eyes. he complained from night blindness, too. he was being treated for dry eye with artificial tears and ophthalmic ointments during the last month without any significant improvement. his vision was 20/20 unaided in both e...

background bronchopulmonary dysplasia (bpd) is one of the most common serious squeal of preterm infants. it involves approximately one quarter of infants with birth weight less than 1500 grams and 30% of less than 1000 grams. vitamin a has been shown to reduce bpd rate. we compared efficacy of low and high doses of vitamin a for prevention of bpd in very low birth weight preterm infants. materi...

Approximately one third of the world’s preschool-age population is estimated to be vitamin A deficient; with highest prevalence (44-50%) being reported in regions of Africa and South-East Asia [1].Vitamin A deficiency continues to be a major public health nutritional problem in India. The prevalence of Bitot’s spot, the objective sign of clinical VAD (0.8%) was higher than the figures recommend...

In order to work towards further reduction of vitamin A deficiency in central Java, Indonesia, a social marketing campaign promoting eggs and dark-green leafy vegetables was initiated in March 1996. The nutritional surveillance system (December 1995-December 1996) found the following. The campaign's messages were well noticed. Consumption of at least one egg in the past week increased from 80% ...

BACKGROUND Our group and many others have used the relative-dose-response (RDR) test and the modified-RDR (MRDR) test as proxy indicators of liver stores of vitamin A. However, we have become concerned about the validity of these indicators. OBJECTIVE Simulation models were used to assess effects of random variations in serum retinol concentration on the RDR and to assess effects of group dif...

The biosynthesis of corneal epithelial proteins and glycoconjugates and their response to vitamin A were measured in vitamin A-deficient and normal rats. The synthesis of specific high-molecular-weight epithelial glycoconjugates was directly related to the levels of vitamin A administered. Protein synthesis, however, remained unaltered. Since vitamin A is known to reverse the keratinization pro...

OBJECTIVE To determine the prevalence of vitamin A deficiency in a population-based sample. METHODS This was a cross-sectional study conducted in the State of Sergipe, northeastern Brazil, in May and June, 1998. It involved 607 children aged 6 to 60 months. The information was obtained by means of interviews with the persons responsible for these children, in their homes. Blood samples were c...