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The effect of hot season and nutrition on the oxidative status and metabolic profile in dairy goats during mid lactation

Published online by Cambridge University Press:  09 March 2007

A. Di Trana ,
P. Celi ,
S. Claps ,
V. Fedele  and
R. Rubino
A. Di Trana
Affiliation:
Dipartimento di Scienze delle Produzioni Animali, Università degli Studi della Basilicata; Via dell'Ateneo Lucano, 10 - 85100 Potenza, Italy
P. Celi*
Affiliation:
Dipartimento di Scienze delle Produzioni Animali, Università degli Studi della Basilicata; Via dell'Ateneo Lucano, 10 - 85100 Potenza, Italy
S. Claps
Affiliation:
Isituto Sperimentale per la Zootecnia, Bella Scalo- 85054 (PZ), Italy
V. Fedele
Affiliation:
Isituto Sperimentale per la Zootecnia, Bella Scalo- 85054 (PZ), Italy
R. Rubino
Affiliation:
Isituto Sperimentale per la Zootecnia, Bella Scalo- 85054 (PZ), Italy
*
†Corresponding author: Email: [email protected]
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Abstract

The aim of this study was to evaluate the effects of the hot season and nutrition on the oxidative status and metabolic profile of lactating goats during mid lactation. Twenty-four Red Syrian goats were allocated into three groups that were offered the following diets: natural pasture (P), pasture+500 g/h per day of concentrate (PC) and hay plus 500 g/h per day of concentrate (HC). Blood samples were taken in spring (85±7 days in milk (DIM)) and summer (120±7 DIM) and assayed for reactive oxygen metabolites (ROMs), α-tocopherol, glucose, triglycerides, cholesterol, non-esterified fatty acids, total protein, albumin and globulin concentrations and glutathione peroxidase (GHS-Px) and superoxide dismutase (SOD) activities. Milk yield and milk composition were also measured. SOD, GSH-Px and ROMs levels increased during summer when temperature humidity index values were high. The increase in ROMs in the PC and HC groups could be ascribed to the improved nutritional regime and to their higher production level. The markers of the oxidative status and of the metabolic profile measured in this study indicate that goats may have experienced moderate oxidative stress. It seems that, seasonal rather than nutritional factors have a more pronounced effect on oxidative status markers. Concentrate supplementation sustained milk yield and may represent a useful means to extend the lactation period in dairy goats during late spring and summer.

Keywords

dairy goatsheat stressmetabolic studiesnutrition
Type
Research Article
Information
Animal Science , Volume 82 , Issue 5 , October 2006 , pp. 717 - 722
Copyright
Copyright © British Society of Animal Science 2006

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