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The effect of different levels of dietary protein on the metabolic/endocrine profile and growth of carp (cyprinus carpio): involvement of growth hormone and insuline
Hertz, Y.; Fine, M.; Madar, Z.; Tchelet, A.; Shechter, Y.; Gertler, A. (1992). The effect of different levels of dietary protein on the metabolic/endocrine profile and growth of carp (cyprinus carpio): involvement of growth hormone and insuline, in: Progress in aquaculture research: proceedings of the 4th German-Isreali Status Seminar held on October 30-31, 1990. Spec. Publ. Eur. Aquacult. Soc, 17: pp. 311-325
In: (1992). Progress in aquaculture research: proceedings of the 4th German-Isreali Status Seminar held on October 30-31, 1990. Spec. Publ. Eur. Aquacult. Soc, 17. European Aquaculture Society: Oostende. ISBN 90-71625-11-7. 360 pp., more
In: Spec. Publ. Eur. Aquacult. Soc, more

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Keyword
    Marine

Authors  Top 
  • Hertz, Y.
  • Fine, M.
  • Madar, Z.
  • Tchelet, A.
  • Shechter, Y.
  • Gertler, A.

Abstract
    Fish fed a low protein (LP) diet for a period of 12 weeks attained a 24% lower weight gain compared to fish on a high protein (HP) diet. Fish fed HP had higher 1evels of serum cortisol, higher activity of liver PEPCK and, subsequently, exhibited higher rate of gluconeogenesis. Serum FFA were higher in LP fed fish, indicating that mobilized lipid may substitute for protein as an energy source. No differences were found in the rate of protein synthesis and the characteristic slow glucose clearance was only slightly lower in the HP diet. Different starch sources affected the growth in fish fed LP but not HP diets. Continuous injection of either insulin or bovine growth hormone (bGH) had no effect on fish fed HP but improved the growth rates in fish fed LP up to that achieved in HP, indicating that glucose utilization was improved at LP. Oral administration of bGH or insulin to fasted carps resulted in a substantial absorption (2 -3%) with only a minimal loss of their biological activities. Co-administration of the hormones with biological detergent, 7- deoxycholate increased the absorption up to 1000 fold, while absorption was impaired in the presence of food in the gut. Thus, administrating biologically active proteins in the presence of detergent may serve as a new approach for affecting growth, reproduction and immunization.

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