Effects of a dexamethasone implant on deposition of intramuscular fat in genetically identical cattle

Journal of Animal Science
T J CorahG C Smith

Abstract

Administration of exogenous glucocorticoids has been shown to enhance deposition of intramuscular fat in cattle. In this study, six pairs of genetically identical (cloned) steers were used to determine the effects of an implant containing 100 mg of dexamethasone on intramuscular fat deposition and on other carcass and meat quality traits. One steer in each pair served as a negative control (CON), whereas the other steer received a dexamethasone implant 30 to 60 d from slaughter (DEX). Treatment with dexamethasone did not (P > .05) enhance intramuscular fat deposition. However, DEX steers had greater (.33 cm; P < .05) thickness of external fat, larger (5.94 cm2; P < .05) longissimus muscle areas, and higher (1.9 percentage points; P < .05) dressing percentages than did CON steers. In addition, treatment with dexamethasone increased (P < .01) serum insulin concentrations. Dexamethasone had no effect (P > .05) on cooked beef palatability traits or on 24-h calpastatin activity. Although the DEX implant tested in this study was not effective for improving carcass quality grade, use of the implant increased external fat thickness and was effective for increasing carcass muscularity and dressing percentage.

Citations

May 3, 2018·Food Additives & Contaminants. Part B, Surveillance·Vita GiacconeVincenzo Ferrantelli
Jun 8, 2012·The Journal of Veterinary Medical Science·Pierluigi ImbimboAlessandra Guidi
Dec 19, 2018·Journal of Analytical Toxicology·Fernando X MoreiraPaula G de Pinho
Aug 31, 2010·The Veterinary Record·F T CannizzoB Biolatti
Mar 24, 2011·Journal of Proteome Research·Roberto StellaIgino Andrighetto

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