期刊
MEAT SCIENCE
卷 137, 期 -, 页码 139-146出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.meatsci.2017.11.024
关键词
Cattle; Beef; Intramuscular fat; Adipocytes; Computer image analysis; Retinoids
资金
- Cooperative Research Centre for Cattle and Beef Quality
Twenty Angus steers were fed a diet low in beta-carotene and vitamin A for 10 months. 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.
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