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Type: Journal article
Title: Vitamin A and marbling attributes: intramuscular fat hyperplasia effects in cattle
Author: Kruk, Z.
Bottema, M.
Reyes-Veliz, L.
Forder, R.
Pitchford, W.
Bottema, C.
Citation: Meat Science, 2018; 137:139-146
Publisher: Elsevier
Issue Date: 2018
ISSN: 0309-1740
Statement of
Z.A. Kruk, M.J. Bottema, L. Reyes-Veliz, R.E.A. Forder, W.S. Pitchford, C.D.K. Bottema
Abstract: Twenty Angus steers were fed a diet low in β-carotene and vitamin A for 10months. Ten steers were supplemented with vitamin A weekly, while the other ten steers did not receive any additional vitamin A. The results demonstrated that the restriction of vitamin A intake increased intramuscular fat (IMF) by 46%. This was a function of the total number of marbling flecks increasing by 22% and the average marbling fleck size increasing by 14%. Vitamin A restriction resulted in marbling flecks that were less branched (22%) and slightly more round (4%) with an increased minor axis length (7%). However, restricting vitamin A did not affect the size of the intramuscular or subcutaneous adipocyte cells or the subcutaneous fat depth. The results suggest that vitamin A affects the amount of marbling and other attributes of the marbling flecks due to hyperplasia rather than hypertrophy. This may explain why vitamin A restriction specifically affects IMF rather than subcutaneous fat deposition.
Keywords: Adipocytes; Beef; Cattle; Computer image analysis; Intramuscular fat; Retinoids
Rights: © 2017 Elsevier Ltd. All rights reserved.
RMID: 0030078478
DOI: 10.1016/j.meatsci.2017.11.024
Appears in Collections:Animal and Veterinary Sciences publications

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