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Oxidative stress indicators and metabolic adaptations in response to the omission of the dry period in dairy cows

Published online by Cambridge University Press:  25 March 2010

Roberto Mantovani ,
Sandy Sgorlon ,
Lieta Marinelli ,
Lucia Bailoni ,
Giovanni Bittante  and
Gianfranco Gabai
Roberto Mantovani*
Affiliation:
Department of Animal Science, University of Padova – Agripolis, Viale dell'Università, 16 – 35020Legnaro (PD), Italy
Sandy Sgorlon
Affiliation:
Department of Animal Science, University of Udine – Via San Mauro, 2 – 33010Pagnacco (UD), Italy
Lieta Marinelli
Affiliation:
Department of Veterinary Experimental Science, University of Padova – Agripolis, Viale dell'Università, 16 – 35020Legnaro (PD), Italy
Lucia Bailoni
Affiliation:
Department of Animal Science, University of Padova – Agripolis, Viale dell'Università, 16 – 35020Legnaro (PD), Italy
Giovanni Bittante
Affiliation:
Department of Animal Science, University of Padova – Agripolis, Viale dell'Università, 16 – 35020Legnaro (PD), Italy
Gianfranco Gabai
Affiliation:
Department of Veterinary Experimental Science, University of Padova – Agripolis, Viale dell'Università, 16 – 35020Legnaro (PD), Italy
*
*For correspondence; e-mail: [email protected]
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Abstract

The effects of dry period omission on oxidative stress and metabolic indicators around calving were studied. Seventeen Italian Friesian cows were randomly assigned to two groups, homogeneous for milk yield and parity, and managed either with a traditional 55-d dry off period (n=8) or continuously milked till parturition (n=9). Between 60 d before expected calving and 90 d after calving, body condition (BCS) was recorded and blood samples were collected to measure cortisol, urea, cholesterol, glucose, NEFA, triglycerides, insulin, malondialdehyde (MDA), total glutathione (GSH) and glutathione peroxidase (GPx) activity. BCS changes after calving were not different between the two groups. The normally dried group showed lower (P<0·05) glucose concentrations on day 7 before calving, greater (P<0·01) non-esterified fatty acid concentrations at 7 d and 15 d after calving, and greater (P<0·01) triglyceride concentrations for all the period before calving. On the other hand, plasma MDA was not different between groups. On average, plasma GSH concentrations were greater in continuously milked cows after calving (P<0·05), while plasma GPx was greater with continuous milking up to parturition (P<0·01). The results confirmed that omitting the dry period leads to an improved energy balance. The degree of oxidative stress was not detrimental for animal health, and the slight modifications of GPx observed prepartum were possibly related to continuous milk secretion. The differences in plasma GSH observed after calving may depend upon sulphur amino acid sparing in continuously milked cows.

Keywords

Dairy cowscontinuous lactationoxidative stressmetabolic status
Type
Research Article
Information
Journal of Dairy Research , Volume 77 , Issue 3 , August 2010 , pp. 273 - 279
Copyright
Copyright © Proprietors of Journal of Dairy Research 2010

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