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Effect of somatic cell count and stage of lactation on the quality and storage life of ultra high temperature milk

Published online by Cambridge University Press:  01 June 2009

Martin J. Auldist ,
Stephen J. Coats ,
Brian J. Sutherland ,
John F. Hardham ,
Graham H. McDowell  and
Graeme L. Rogers
Martin J. Auldist
Affiliation:
School of Agriculture, La Trobe University, Bundoora, VIC 3083, Australia
Stephen J. Coats
Affiliation:
†Bonlac Foods Ltd, PO Box 4313, Melbourne, VIC 3001, Australia,
Brian J. Sutherland
Affiliation:
‡CSIRO Division of Food Science and Technology, Highett, VIC 3190, Australia
John F. Hardham
Affiliation:
‡CSIRO Division of Food Science and Technology, Highett, VIC 3190, Australia
Graham H. McDowell
Affiliation:
School of Agriculture, La Trobe University, Bundoora, VIC 3083, Australia
Graeme L. Rogers
Affiliation:
†Bonlac Foods Ltd, PO Box 4313, Melbourne, VIC 3001, Australia,
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Summary

The effects of bulk milk cell count (BMCC) and stage of lactation on the quality and storage characteristics of UHT milk were investigated. The UHT milk was manufactured in a pilot plant using milk of low BMCC from early and late lactation, and milk of high BMCC from early and late lactation. Upon storage at 20°C, early lactation UHT milk gelled far ahead of late lactation milk. Within each stage of lactation, high BMCC milk tended to gel first. Few differences in the organoleptic properties of the UHT milks were observed. It was apparent that the onset of age gelation may not always be related directly to the level of proteolysis, and that other factors influencing milk composition and the reactions between milk components may play more important roles. At a particular stage of lactation, proteolysis induced by mastitis may hasten the onset of gelation.

Type
Original Articles
Information
Journal of Dairy Research , Volume 63 , Issue 3 , August 1996 , pp. 377 - 386
Copyright
Copyright © Proprietors of Journal of Dairy Research 1996

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References

REFERENCES

Ahkné, L. & Björck, L. 1985 Lipolysis and the distribution of lipase activity in bovine milk in relation to stage of lactation and time of milking. Journal of Dairy Research 52 55–64Google Scholar
Auldist, M. J., Coats, S., Sutherland, B. J., Mayes, J. J., McDowell, G. H. & Rogers, G. L. 1996 Effects of somatic cell count and stage of lactation on raw milk composition and the yield and quality of Cheddar cheese. Journal of Dairy Research 63 269–280CrossRefGoogle ScholarPubMed
Beeby, R. 1980 The use of fluorescamine at pH 6·0 to follow the action of chymosin on κ-casein and to estimate this protein in milk. New Zealand Journal of Dairy Science and Technology 15 99–108Google Scholar
Corradini, C. 1975 Gel formation behaviour in UHT sterilized milk. Milchwissenschaft 30 413–416Google Scholar
Corradini, C. & Pecis, P. P. 1979 Proteolytic activity in UHT-sterilized milk. Journal of Dairy Research 46 227–229CrossRefGoogle ScholarPubMed
Pande, Deepa & Mathur, M. P. 1992 Storage studies on UHT milk in relation to residual proteases and lipases with particular reference to casein and lipid composition. Indian Journal of Dairy Science 45 469–476Google Scholar
Deeth, H. C. 1993 Lipase activity and its effect on milk quality. Australian Journal of Dairy Technology 48 96–98Google Scholar
De Koning, P. J., Kaper, J., Rollema, H. S. & Driessen, F. M. 1985 Age-thining and gelation in unconcentratcd and concentrated UHT-sterilized skim milk. Effect of native milk proteinase. Netherlands Milk and Dairy Journal 39 71–87Google Scholar
Fischer, S. A., Otter, D. E. & Hill, J. P. 1994 Seasonal survey of protein composition of skim milk and whey in New Zealand. Proceedings, XXIVth International Dairy Congress, Melbourne. Brief Communications, p. 183Google Scholar
Harwalkar, V. R. 1982 Age gelation of sterilized milks. In Developments in Dairy Chemistry - 1. Proteins, pp. 229–269 (Ed. Fox, P. F.). London: Applied Science PublishersGoogle Scholar
Keogh, B. P. & Pettingill, G. 1984 Influence of enzyme activity of bacteria and leucocytes in raw milk on age gelation after UHT processing. Journal of Food Protection 47 105–107CrossRefGoogle ScholarPubMed
Kocak, H. R. & Zadow, J. G. 1985 Age gelation of UHT whole milk as influenced by storage temperature. Australian Journal of Dairy Technology 40 14–21Google Scholar
Kohlmann, K. L., Nielsen, S. S. & Ladisch, M. R. 1988 Effect of serine proteolytic enzymes (trypsin and plasmin), trypsin inhibitor, and plasminogen activator addition to ultra-high temperature processed milk. Journal of Dairy Science 71 1728–1739CrossRefGoogle Scholar
Kohlmann, K. L., Nielsen, S. S. & Ladisch, M. R. 1991 Effects of a low concentration of added plasmin on ultra-high temperature processed milk. Journal of Dairy Science 74 1151–1156CrossRefGoogle Scholar
Kondal Reddy, K., Nguyen, M. H. & Kailasapathy, K. 1991 The effects of some treatments and storage temperatures on UHT whole milk. Australian Journal of Dairy Technology 46 57–63Google Scholar
Korycka-Dahl, M., Ribadeau-Dumas, B., Chene, N. & Martal, J. 1983 Plasmin activity in milk. Journal of Dairy Science 66 704–711CrossRefGoogle Scholar
McMahon, D. J. & Alleyne, M. C. 1994 A mechanism for the age gelation of UHT milk. Proceedings, XXIVth International Dairy Congress, Melbourne. Brief Communications, p. 188.Google Scholar
Manji, B. & Kakuda, Y. 1988 The role of protein denaturation, extent of proteolysis, and storage temperature on the mechanism of age gelation in a model system. Journal of Dairy Science 71 1455–1463CrossRefGoogle Scholar
Munro, G. L., Grieve, P. A. & Kitchen, B. J. 1984 Effects of mastitis on milk yield, milk composition, processing properties and yield and quality of milk products. Australian Journal of Dairy Technology 39 7–16Google Scholar
Rampilli, M. & Andreini, R. 1993 Evaluation of colour components in sterilised milk. Italian Journal of Food Science 4 285–291Google Scholar
Schaar, J. 1985 Plasmin activity and proteose-peptone content of individual milks. Journal of Dairy Research 52 369–378CrossRefGoogle Scholar
Snoeren, T. H. M., Van Der Spek, C. A., Dekker, R. & Both, P. 1979 Proteolysis during the storage of UHT-sterilized whole milk. 1. Experiments with milk heated by the direct system for 4 seconds at 142°C. Netherlands Milk and Dairy Journal 33 31–39Google Scholar
Standards Association Of Australia 1974 Methods for the analysis of dried milk and whey – sensory examination. (SAA AS 1629.4)Google Scholar
Swartling, P. 1968 UHT sterilization and aseptic packaging of milk. Australian Society of Dairy Technology Technical Publications no. 19 18–25Google Scholar
Zadow, J. G. & Chituta, F. 1975 Age gelation of ultra-high temperature milk. Australian Journal of Dairy Technology 30 104–106Google Scholar