PMID: 2510176Nov 1, 1989Paper

Dietary thyrotropin-releasing hormone stimulates growth rate and increases the insulin: glucagon molar ratio of broiler chickens

Proceedings of the Society for Experimental Biology and Medicine
L A CogburnJ P McMurtry

Abstract

The effects of thyroid manipulation on growth, feed efficiency, and plasma hormone levels were determined in rapidly growing chickens. Beginning at 3 weeks of age, eight broiler cockerels were provided with control feed (CF) or feed containing either 1 ppm of triiodothyronine (T3), 1 ppm of thyroxine (T4), 0.3% propylthiouracil (PTU), or 5 ppm of thyrotropin-releasing hormone (TRH) for 3 weeks. Blood samples were taken at 4, 5, and 6 weeks for determination of plasma levels of growth hormone, insulin-like growth factor, T3, T4, insulin, glucagon, glucose, and nonesterified fatty acids. Dietary TRH increased (P less than 0.05) the growth rate of chickens by 14% when compared with the CF group. Plasma growth hormone levels were reduced (P less than 0.05) 65% by dietary T3 and 33% by treatment with either T4 or TRH when compared with the CF group. Plasma insulin-like growth factor levels were 16% lower (P less than 0.05) in PTU-fed birds than the other treatment groups. Plasma T3 levels were elevated (P less than 0.05) 3-fold by dietary T3 and 38% by TRH whereas plasma T3 in the PTU group was 38% below the average of CF birds. Plasma T4 levels were increased (P less than 0.05) by 12-fold in T4-fed birds, decreased 48% in TRH-fed b...Continue Reading

Citations

Dec 1, 1993·Comparative Biochemistry and Physiology. Comparative Physiology·R W Rosebrough
Jan 1, 1995·Comparative Biochemistry and Physiology. Part A, Physiology·R F Moellers, L A Cogburn
Sep 1, 1994·Comparative Biochemistry and Physiology. Part C, Pharmacology, Toxicology & Endocrinology·J A ProudmanL A Cogburn
Aug 30, 2000·Domestic Animal Endocrinology·R W Rosebrough, J P McMurtry
Mar 19, 2003·Domestic Animal Endocrinology·R W Rosebrough, J P McMurtry
Mar 21, 2007·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·R W RosebroughM P Richards
Feb 3, 2005·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·R W RosebroughM P Richards
Dec 13, 2005·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·R W RosebroughJ P McMurtry
Nov 1, 1992·The British Journal of Nutrition·R W RosebroughR Vasilatos-Younken
Mar 20, 1998·The British Journal of Nutrition·R W RosebroughR Vasilatos-Younken
Apr 1, 1996·The British Journal of Nutrition·R W RosebroughJ P McMurtry
Dec 19, 2003·Experimental Biology and Medicine·Moon K SongVay Liang W Go

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