DNA dependent - RNA polymerase activity in the chicken liver and breast muscle after protein restriction
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The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, 05-110 Jabłonna near Warsaw, Poland
Publication date: 1993-09-06
J. Anim. Feed Sci. 1993;2(3):137-145
The experiment was carried out on 36 one-day-old chickens fed to appetite a starter feed for broilers up to the age of 11 days. At this time 6 chickens (group zero) were sacrified. The remaining birds were divided into 3 groups: control (C), undernourished (U) and realimented (R). Two isocaloric diets with different protein content (12.9%-LP and 22.6%-HP) were force fed. The experiment was divided into two periods: during the first the mean body weight increased from 134 to 250 g and during the second-from 250 to 450 g. Throughout the experiment chickens C were fed the HP diet, chickens from U group the LP diet. The R group received LP diet and then, in the second period, HP diet. At the end of the first period 6 chickens from the C group and 6 from the U group, and at the end of the second period 6 chicken from C, U and R groups were sacrified to determine RNA polymerases activity in liver and breast muscle. Applied feeding regime had no significant effect on polymerase I and I I activity in the liver. On the other hand it evoked significant increase of activity of these enzymes in breast muscle of R chickens. This suggests possibility of regulation of protein biosynthesis on the level of transcription by changing either content or activity of RNA polymerases.
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