Udder health implications of premature bovine mammary regression. I. Clinical, subclinical and reducing-sugar changes in milk during 168 hours of suspended milking in mid-lactation

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dc.contributor.author Giesecke, W.H.
dc.contributor.author Korybut-Woroniecki, P.A.
dc.contributor.author Kowalski, Z.E.
dc.contributor.editor Verwoerd, Daniel Wynand
dc.date.accessioned 2014-08-21T07:15:09Z
dc.date.available 2014-08-21T07:15:09Z
dc.date.created 2013
dc.date.issued 1990
dc.description The articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format. en
dc.description.abstract The investigation involved 4 mastitis-free cows, exposed to 168 h of suspended milking to induce prolonged milk stasis and premature mammary regression during mid-lactation. After 48 h the milk stasis elicited mastitis-like changes in the clinical, somatic cell count (SCC), bovine serum albumin (BSA) and beta-N-acetyl-D-glucosaminidase(NAG) characteristics of the udder secretions. Such changes in secretions from non-mastitic regressive mammary glands raise doubts about the present knowledge, definition, and diagnosis of so-called non-specific or aseptic mastitis. Determinations of fluctuating lacteal concentrations of lactose, galactose, mannose and glucose suggest that the secretory epithelium altered its metabolism and integrity in response to the intramammary perturbation by following a certain pattern of regressive adjustments which: (i) were apparently triggered during the initial24 h of perturbation by disturbed Na-K-ATPase activities, followed by a cascade of changes in ion regulation, carbohydrate metabolism and increased formation of lactic acid as a metabolic end-product; (ii) advanced in a stepwise fashion during 0-24, 24-72 and 72-168 h of perturbation from recognition response to alarm reactions and manifestation of regression respectively; (iii) showed that markedly decreased carbohydrate levels preceded major increases of the SCC, BSA and NAG values; (iv) indicated that after 72 h of milk stasis leucocytic infiltrations sharply increased the SCC to more than 500 000 per ml and accelerated the manifestation of regression. The results of this study imply that extensive premature regression of healthy, and especially, pre-irritated udders could have significant implications for the development of different types of bovine mastitis during lactation and should be further investigated. en
dc.description.librarian mn2014
dc.identifier.citation Giesecke, WH, Korybut-Woroniecki, PA & Kowalski, ZE 1990, 'Udder health implications of premature bovine mammary regression. I. Clinical, subclinical and reducing-sugar changes in milk during 168 hours of suspended milking in mid-lactation’, Onderstepoort Journal of Veterinary Research, vol. 57, no. 1, pp. 25-35. en
dc.identifier.issn 0330-2465
dc.identifier.uri http://hdl.handle.net/2263/41474
dc.language.iso en en
dc.publisher Published by the Government Printer, Pretoria. en
dc.rights ©South Africa. Dept. of Agricultural Technical Services. ©University of Pretoria. Dept. of Library Services (digital). en
dc.subject Veterinary medicine en
dc.subject Bovine mammary regression en
dc.subject Reducing sugars in milk en
dc.subject Susceptibility to udder infection en
dc.subject Mastitis en
dc.subject.lcsh Veterinary medicine -- South Africa
dc.title Udder health implications of premature bovine mammary regression. I. Clinical, subclinical and reducing-sugar changes in milk during 168 hours of suspended milking in mid-lactation en
dc.type Article en


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