Lindahl, Gunilla
(2005).
Colour characteristics of fresh pork.
Diss. (sammanfattning/summary)
Uppsala :
Sveriges lantbruksuniv.,
Acta Universitatis Agriculturae Sueciae, 1652-6880
; 2005:43
ISBN 91-576-7042-0
[Doctoral thesis]
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Abstract
The objective of the present thesis was to obtain more fundamental understanding of the mechanisms for variations in colour and colour stability of fresh pork. The effects of breed and genotype, including Duroc, Hampshire (three RN alleles), Landrace and Yorkshire pigs, were studied. Furthermore, effects of strategic feeding with creatine, pre-slaughter treatment, slaughter procedure and carcass cooling on muscle metabolism and ultimate colour and colour stability were studied. It was concluded that the early progress in post mortem temperature and pH decline affect the colour of pork independent of whether this is triggered by variations in genotype, feed-induced changes, pre-slaughter stress or cooling rate. The level of oxymyoglobin was shown to be more important for the colour of pork during retail display, than the level of metmyoglobin. A high level of oxymyoglobin preserves high redness despite of oxidation to metmyoglobin. Ageing of pork for a week increased the ability of pork to stimulate oxygenation of deoxymyoglobin to oxymyoglobin, i.e. blooming, without compromising the colour stability during four days of subsequent retail display. Hence, ageing results in lighter, redder and more yellow pork colour. It was further concluded that genetics giving rise to variation in the colour of pork is related to differences in pigment content and in muscle metabolism. The latter influences the redox status of the muscle and the activity of oxygen-consuming and metmyoglobin-reducing enzymes and accordingly the relative proportion of the myoglobin species. The colour of pork from Landrace pigs was generally lighter, redder and more yellow than pork from Duroc pigs due to higher level of oxymyoglobin at the meat surface, i.e. more intense blooming. The colour of pork from Hampshire pigs was highly related to the RN genotype. Pork from carriers of the RN- allele was generally lighter, redder and more yellow than that from non-carriers of the RN- allele, and the rn* (V199I) allele tended to decrease redness and yellowness.
Authors/Creators: | Lindahl, Gunilla | ||||
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Title: | Colour characteristics of fresh pork | ||||
Series Name/Journal: | Acta Universitatis Agriculturae Sueciae | ||||
Year of publishing : | 2005 | ||||
Number: | 2005:43 | ||||
Number of Pages: | 73 | ||||
Papers/manuscripts: |
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Place of Publication: | Uppsala | ||||
ISBN for printed version: | 91-576-7042-0 | ||||
ISSN: | 1652-6880 | ||||
Language: | English | ||||
Publication Type: | Doctoral thesis | ||||
Full Text Status: | Public | ||||
Agris subject categories.: | Q Food science > Q04 Food composition | ||||
Subjects: | Not in use, please see Agris categories | ||||
Agrovoc terms: | pork, colour, pigments, myoglobin, creatine, supplementary feeding, breeds (animals), genotypes, ripening, storage, carcass composition, cooling, ph | ||||
Keywords: | colour characteristics, myoglobin species, blooming, pork, breed, RN genotype, pH decline, creatine, cooling, ageing | ||||
URN:NBN: | urn:nbn:se:slu:epsilon-630 | ||||
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-630 | ||||
ID Code: | 827 | ||||
Department: | (NL, NJ) > Dept. of Food Science (until 161231) | ||||
Deposited By: | Gunilla Lindahl | ||||
Deposited On: | 28 Apr 2005 00:00 | ||||
Metadata Last Modified: | 02 Dec 2014 10:07 |
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