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Effects of cimaterol administration on plasma concentrations of various hormones and metabolites in Friesian steers.

Abstract：

:The aim of the experiment was to determine the acute and chronic effects of the beta-agonist, cimaterol, on plasma hormone and metabolite concentrations in steers. Twelve Friesian steers (liveweight = 488 +/- 3 kg) were randomly assigned to receive either 0 (control; n = 6) or .09 mg cimaterol/kg body weight/day (treated; n = 6). Steers were fed grass silage ad libitum. Cimaterol, dissolved in 140 ml of acidified distilled water (pH 4.2), was administered orally at 1400 hr each d. After 13 d of treatment with cimaterol or vehicle (days 1 to 13), all animals were treated with vehicle for a further 7 d (days 14 to 20). On days 1, 13 and 20, blood samples were collected at 20 min-intervals for 4 hr before and 8 hr after cimaterol or vehicle dosing. All samples were assayed for growth hormone (GH) and insulin, while samples taken at -4, -2, 0, +2, +4, +6 and +8 hr relative to dosing were assayed for thyroxine (T4), triiodothyronine (T3), cortisol, urea, glucose and non-esterified fatty acids (NEFA). Samples taken at -3 and +3 hr relative to dosing were assayed for IGF-I only. On day 1, cimaterol acutely reduced (P less than .05) GH and urea concentrations (7.6 vs 2.9 +/- 1.4 ng/ml; and 6.0 vs 4.9 +/- 0.45 mmol/l, respectively; mean control vs mean treated +/- pooled standard error of difference), and increased (P less than .05) NEFA, glucose and insulin concentrations (160 vs 276 +/- 22 mumol/l, 4.1 vs 6.2 +/- 0.15 mmol/l and 29.9 vs 179.7 +/- 13.9 microU/ml, respectively). Plasma IGF-I, T3, T4 and cortisol concentrations were not altered by treatment. On day 13, cimaterol increased (P less than .05) GH and NEFA concentrations (7.7 vs 14.5 +/- 1.4 ng/ml and 202 vs 310 +/- 22 mEq/l, respectively) and reduced (P less than .05) plasma IGF-I concentrations (1296 vs 776 +/- 227 ng/ml). Seven-d withdrawal of cimaterol (day 20) returned hormone and metabolite concentrations to control values. It is concluded that: 1) cimaterol acutely increased insulin, glucose and NEFA and decreased GH and urea concentrations, 2) cimaterol chronically increased GH and NEFA and decreased IGF-I concentrations, and 3) there was no residual effect of cimaterol following a 7-d withdrawal period.

journal_name

Domest Anim Endocrinol

journal_title

Domestic animal endocrinology

authors

Chikhou F,Moloney AP,Austin FH,Roche JF,Enright WJ

doi

10.1016/0739-7240(91)90016-d

subject

Has Abstract

pub_date

1991-10-01 00:00:00

pages

471-80

issue

4

eissn

0739-7240

issn

1879-0054

pii

0739-7240(91)90016-D

journal_volume

8

pub_type

杂志文章

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