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Journal of Nutrition Vol. 106 No. 7 July 1976, pp. 947-951
Copyright © 1976 by American Society for Nutrition
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Immunoreactive Growth Hormone Levels in Pigs Fed Protein or Energy Restricted Diets during the Postweaning Period1

Tola Atinmo2, Carlos Baldijão3, Wilson G. Pond4 and Richard H. Barnes

Division of Nutritional Sciences and Department of Animal Science, Cornell University, Ithaca, New York 14853

Developmental changes in growth hormone levels during protein or energy malnutrition was studied in weaned pigs. Three or 4 week old pigs from control dams were fed a control diet (18% protein), an energy-restricted diet (18% protein) or a low protein diet (6% protein) for 8 weeks. Energy restriction was achieved by feeding the control diet in amounts that allowed very little growth. After the restriction period, all pigs were fed the control diet ad libitum for another 8 weeks. Blood samples were collected at intervals throughout the experiment and the plasma was analyzed for growth hormone by radioimmunoassay. Post weaning protein deprivation resulted in higher growth hormone levels during the restriction period as compared to control pigs or pigs with a restricted energy intake.

KEY WORDS: • postnatal malnutrition • protein restriction • energy restriction • growth hormone

1 Supported in part by funds provided through the State University of New York and Public Health Research Grant no. HD-02581 from the National Institute of Child Health and Human Development.

2 Present address: Applied Nutrition Unit, University of Ibadan, Nigeria.

3 Present address: Departamento de Fisiologia, Instituto de Ciencias Biomedicas, Universidade de Sao Paulo, Brasil.

4 Department of Animal Science, Cornell University, Ithaca, New York.

Manuscript received 5 January 1976.




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