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Effect of Collection Stress on Serum Growth Hormone Levels in Pygmy Goats^{1 ,2,}

Oregon State University⁶, Corvallis 97331

⁵ Please send reprint requests to Dr. Swanson.

Abstract

Four experiments were conducted with mature female pygmy goats to determine the effect of blood collection stress and blood collection method on serum growth hormone (GH) levels and the nature of serum GH variability. Repeated blood sample collection via jugular venipuncture did not affect serum GH levels. Comparison of serum GH levels in blood samples collected via jugular venipuncture and jugular cannula indicated a lack of significant difference between methods, although GH levels in samples collected by jugular cannula were higher and more variable. Restraint failed to influence serum GH in cannulated goats. Variability observed in serum GH in samples collected without the goats' knowledge indicates that GH is secreted episodically at irregular intervals irrespective of the constraints of this experiment. The data in these experiments indicate that, in pygmy goats, release of pituitary GH was not increased when the animals were subjected to stressful stimuli. We have demonstrated the validity of a bovine GH radioimmunoassay system for quantitating GH in the pygmy goat

¹ Technical Paper No. 3804, Oregon Agricultural Experiment Station.

² Dr. Harold Hafs generously provided the guinea pig anti-bovine GH serum. Ovine and bovine pituitary hormones were provided by the Endocrinology Study Section of NIH. The technical assistance of Susan K. Martin is gratefully acknowledged. The Oregon Heart Association kindly provided the pygmy goats used for the arginine infusion.

³ Present address: Mesa College, Grand Junction, CO 81501

⁴ This study was supported in part by NDEA Graduate Fellowship Program Award 437-003210.

⁶ Department of Animal Science.