J. Anim Sci.
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J. Anim Sci. 1968. 27:1445-1448.
© 1968 American Society of Animal Science
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Effect of Adaptation to Dietary Nitrate on Thyroxine Secretion Rate and Growth in Lambs1

S. P. Arora2, 5,, E. E. Hatfield, U. S. Garrigus, F. E. Romack3 and H. Motyka4

University of Illinois,5, Urbana

Abstract

Eighteen growing ewe lambs were used to study the effect of dietary nitrate on the thyroxine secretion rate. The lambs were randomly assigned to three groups (A, B or C) and were located in a laboratory with temperature maintained at 21° C. Group A was fed 1.36 kg. of basal diet per day. Group B was given the same diet until the date of I131 administration, then it received diet II which consisted of the basal diet supplemented with approximately 4% potassium nitrate. Group C received diet II throughout the thyroxine secretion rate study. Thyroxine secretion rate of lambs in group A was 0.48±0.014 mg. per 45.4 kg. bodyweight per animal daily. Bodyweight and thyroxine secretion rate were positively correlated (r=0.69). Slope of the regression was described by the equation y=0.201+0.0046x. The daily thyroxine secretion rate of group B lambs was 0.1 mg. per 45.4 kg. bodyweight lower than the thyroxine secretion rate of lambs in group A. Nitrate-adapted group C lambs secreted the same level of thyroxine as lambs in group A. Further growth studies suggested that lambs adapted to a nitrate supplemented diet between 14 and 43 days.

Thyroid secretion rate and growth data suggested that lambs could adapt to the experimental diets containing approximately 4% potassium nitrate.

Footnotes

1 Investigation was supported in part by the United States Atomic Energy Commission, Contract Number AT(11-1) 1484.

2 Indian staff member assigned to study at University of Illinois in Animal Nutrition under the A.I.D. Program.

3 Department of Veterinary Anatomy and Histology.

4 Present address: Wroclaw, Poland.

5 Department of Animal Science.






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Copyright © 1968 by the American Society of Animal Science.