Plasma Cholesterol, Indol, Urea and Protein in Kids Exposed to Direct Solar Radiation

1 Institute of Animal Science, BG-2230 Kostinbrod, Bulgaria
2 Institute of Mountainous Animal Breeding and Agriculture BG-5600 Troyan, Bulgaria


GUDEV, D., S. RALCHEVA, Y. ALEXIEV, P. MONEVA, P. ZUNEV and I. YANKOV, 2005. Plasma cholesterol, indol, urea and protein in kids exposed to direct solar radiation. Bulg. J. Agric. Sci., 11: 611-617

Fifteen six months old kids of Anglonubian (An), Bulgarian white (Bw) and Toggenburg (Tg) breeds where used to study the effect of solar radiation for six hours (8 a.m. - 1 p.m.) on plasma levels of cholesterol, indol urea and total protein. Temperature humidity index at 1 p.m, was 84.
Exposure to solar radiation caused an increase of plasma cholesterol level in Tg (P<0.05) and An (P>0.05) kids but no effect on cholesterol level in Bw kids.
Cholesterol values in Tg kids where higer (P<0.05) then those in Bw kids.
Plasma levels of indol and total protein were not influenced by the exposure to solar radiation. There was no significant effect of solar radiation on plasma urea levels in the three breeds. Plasma urea levels in thermoneutral ambient temperature were higher (P<0.05) in Tg kids in comparison with the other two breeds.
Exposure to heat resulted in higher plasma level of urea (P>0.05) in Tg kids than in Bw kids.
The result of the present study are interpreted in the light of the recent data concerning the effect of heat stress on cellular metabolism.

Key words: plasma cholesterol. Indol, urea, protein solar radiation