J. King Saud Univ., Vol. 13,Agric. Sci. (1), pp. 91-113, Riyadh (A.H. 1421/2001)
The Role of Lipoproteins in Lipid Metabolism of Chickens
Tarek M Shafey
Department ofAnimal Production, College ofAgriculture, King Saud University, Riyadh, Saudi Arabia
Abstract. This review addresses the role of lipoproteins in regulating lipid transport and deposition in chickens. The formation, secretion, classes, structure, function and interrelationship of the various plasma lipoproteins are reviewed. The compiled facts reveal the features of the functional role of lipoprotein in lipid metabolism as: (1) the metabolism of lipoproteins is dependant on their structure and the activities of various enzymes; (2) plasma lipoproteins are important factors not only in the mechanisms that control the development of adipose tissues during growth but also in the distribution of lipid to different adipose tissue depots. (3) in some cases, these lipoproteins are targeted to specific tissues (i.e. growing oocytes) by apoproteins found on their surface that interact with high affinity cell surface receptors; (4) differences in plasma lipoprotein profiles among different classes of chickens may reflect the differences in the physiological states of these birds. An important characteristic of chicken plasma lipoproteins is that their concentration changes under different physiological states. This offers exceptional opportunities for comparison studies.
Keywords: chickens, lipoproteins, apoproteins, VLDL, LDL, HDL, lipoprotein receptor.