Gholamreza AFSHARI, Ali HASANPOOR, Hadi HAGPANAH

Seasonal Variation of Vitamin A and Beta-Carotene Levels in Ghezel Sheep

The present study was conducted to investigate the variations in blood serum and hepatic levels of vitamin A and b-carotene in Ghezel sheep throughout the year. From 1000 sheep aged 1-5 years, blood and liver samples were collected before and after slaughter. The levels of vitamin A and b-carotene in both samples were determined spectrophotometrically. The results showed significant differences between summer and winter values (P < 0.05), but no differences were found between the sexes (P > 0.05). There were significant correlations between the vitamin A levels in serum and the liver (P < 0.05). Due to low levels of vitamin A and b -carotene in Ghezel sheep during the winter, supplementary feeding of vitamin A is recommended during this season.

Anahtar Kelimeler:

Vitamin A, Beta-carotene, Ghezel sheep, serum, liver, spectrophotometry

Seasonal Variation of Vitamin A and Beta-Carotene Levels in Ghezel Sheep

Keywords:

Vitamin A, Beta-carotene, Ghezel sheep, serum, liver, spectrophotometry,

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Underwood, B.A.: Vitamin A in animal and human nutrition. In: Sporn, M.B., Roberts, A.B., Goodman, D.S. Eds. The Retinoids, Vol. 1. Academic Press, New York. 1984; 282-392.
Radostits, D.M., Blood, D.C., Henderson, J.A: Veterinary Medicine a Text Book of the Disease of Cattle, Sheep, Pigs, Goats and Horses. 9thedn., Bailler Tindall, London. 2000
Pesce, A.J., Kaplan, L.A.: Methods in Clinical Chemistry. Mosby Inc., Toronto. 1987
Smith, B.P.: Large Animal Internal Medicine. 3rdedn., Mosby Inc., St. Louis. 2002
National Research Council: Nutrient requirement and signs of deficiency. 6thedn., National Academy of Sciences Press, Washington DC. 1995.
Paulsen, M.E., Johnson, L., Young, S., Norrdin, R.W., Severin, G.A., Knight, A.P., King, V.: Blindness and sexual dimorphism associated with vitamin A deficiency in feedlot cattle. J. Am. Vet. Med. Assoc., 1989; 194: 933-937 7. Pugh, D.G.: Sheep and Goat Medicine. W.B. Saunders Company, Philadelphia. 2002.
Howells, L.C., Livesey, C.T.: A survey of vitamin A concentrations in the liver of food-producing animals. Food Addit. Contam., 1998; l5: 10-18. 9. Asadian, A., Mirhadi, S.A, Mézes, M.: Seasonal variation in the concentration of vitamins A and E in the blood plasma of fat-tailed sheep. Acta Vet. Hung., 1995; 43: 453-461.
Scotter, M.J., Thorpe, S.A., Reynolds, S.L., Wilson, L.A., Lewis, D.J.: Survey of animal livers for vitamin A content. Food Addit. Contam., 1992; 9: 237-242.