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Please use this identifier to cite or link to this item: http://hdl.handle.net/11019/561

Title: Colour of subcutaneous adipose tissue and muscle of Irish beef carcasses destined for the Italian market.
Authors: Dunne, Peter G.
O'Mara, Frank P.
Monahan, Frank J
Moloney, Aidan P
Keywords: Carcass fat
Colour
Heifers
Italian beef market
Muscle
Issue Date: 2004
Publisher: Teagasc (Agriculture and Food Development Authority), Ireland
Citation: P.G. Dunne, F.P. O’Mara, F.J. Monahan, A.P. Moloney. Colour of subcutaneous adipose tissue and muscle of Irish beef carcasses destined for the Italian market. Irish Journal of Agricultural and Food Research 43: 217–226, 2004.
Series/Report no.: Irish Journal of Agricultural and Food Research;vol 43
Abstract: The purposes of this study were (i) to objectively measure the colour of carcass fat and muscle of heifers that had been previously selected, subjectively, for the Italian market and (ii) to define instrumental colour values which would describe the required fat colour for that market. On one day during each of 5 months (11 April, 13 June, 10 October, 10 November and 19 December) the ‘b’ (yellowness) value of carcass fat was measured at two positions (proximal pelvic limb area and the area between 9th rib and 4th lumbar vertebra) and the ‘L’ (lightness) and ‘a’ (redness) values of two muscles (M. longissimus dorsi (LD) and M. rhomboideus thoracis (RT)) were measured using a Minolta chromameter. Measurement date had a significant effect (P < 0.05) on ‘b’ values of fat at both positions, with carcasses displaying the most yellow fat on 13 June (P < 0.05). The LD was palest and most red on 11 April (P < 0.05) and the RT tended to be palest on 13 June but most red (P < 0.05) on 11 April. The ‘L’ value differed between muscles on 11 April (P < 0.01) and 19 December (P < 0.05) and the ‘a’ value differed between muscles on all dates except 13 June. The majority of carcasses on each date fell between muscle ‘L’ values of 31 and 35, regardless of muscle, and between muscle ‘a’ values of 18 and 22. It is concluded that application of a “cut-off” value to muscle colour would be futile but as 81% of accepted carcasses had fat ‘b’ values below 14.2, regardless of position, that this could be used as a threshold of acceptable yellowness.
Description: peer-reviewed
This research was funded by the Irish Government under The National Development Plan, 2000–2006. Support to P.G. Dunne under the Teagasc Walsh Fellowship Programme is acknowledged.
URI: http://hdl.handle.net/11019/561
http://www.teagasc.ie/research/journalarchives/vol43no22004fullpdfs.asp
ISSN: 0791-6833
Appears in Collections:Animal & Bioscience
IJAFR, volume 43, 2004

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