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Effect of dietary supplementation with different sources of selenium on growth response, selenium blood levels and meat quality of intensively finished Charolais young bulls

Published online by Cambridge University Press:  10 May 2011

G. Cozzi ,
P. Prevedello ,
A. L. Stefani ,
A. Piron ,
B. Contiero ,
A. Lante ,
F. Gottardo  and
E. Chevaux
G. Cozzi*
Affiliation:
Dipartimento di Scienze Animali, Università degli Studi di Padova, Viale dell’ Università 16, 35020 Legnaro (PD), Italy
P. Prevedello
Affiliation:
Dipartimento di Scienze Animali, Università degli Studi di Padova, Viale dell’ Università 16, 35020 Legnaro (PD), Italy
A. L. Stefani
Affiliation:
Istituto Zooprofilattico Sperimentale delle Venezie, Viale dell’ Università 16, 35020 Legnaro (PD), Italy
A. Piron
Affiliation:
Lallemand SAS, 19 rue des Briquetiers, 31702 Blagnac, France
B. Contiero
Affiliation:
Dipartimento di Scienze Animali, Università degli Studi di Padova, Viale dell’ Università 16, 35020 Legnaro (PD), Italy
A. Lante
Affiliation:
Dipartimento di Biotecnologie Agrarie, Viale dell’ Università 10, 35020 Legnaro (PD), Italy
F. Gottardo
Affiliation:
Dipartimento di Scienze Animali, Università degli Studi di Padova, Viale dell’ Università 16, 35020 Legnaro (PD), Italy
E. Chevaux
Affiliation:
Lallemand SAS, 19 rue des Briquetiers, 31702 Blagnac, France
*
†E-mail: giulio.cozzi@unipd.it
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Abstract

The study aimed at comparing three strategies of supplementing selenium (Se) during the finishing period of Charolais young bulls: (1) administration of sodium selenite throughout the finishing (NaSe); (2) administration of an Se-enriched yeast strain (Saccharomyces cerevisiae NCYC R397) throughout the finishing (Se-Y); (3) administration of sodium selenite for 140 days replaced by Se-enriched yeast during the last 70 days of finishing (Switch). Eighty-four young bulls (mean initial BW = 434.2 ± 31.9 kg; mean age = 382 ± 52 days) were stratified by live weight and equally assigned to one of three Se treatments. Experimental groups were fed the same diets and the inclusion rate of the different treatments was targeted to achieve 0.3 mg of Se/kg of dry matter (DM) in the complete feed. The average daily gain of bulls was 1.36 kg/d and no differences due to Se treatment were recorded. Dry matter intake and feed conversion ratio were not affected by Se treatment resulting in, on average, 10.3 kg/d and 7.65, respectively. Repeated blood samples were taken at days 0, 120, 180 and 210 of finishing to assess the Se status of the animals. As compared to NaSe, both organic Se treatments (Se-Y and Switch) increased plasma Se in the last two sampling sessions according to a significant treatment × time interaction (P < 0.001). A similar trend was observed for serum total antioxidant status of the young bulls, whereas there was only a significant time effect (P < 0.001) on glutathione peroxidase activity that was raised by all Se treatments. The finishing period lasted 210 days and at the abattoir there were no differences across Se treatments in carcass weight and dressing percentage. A higher Se content in the Longissimus thoracis (LT) muscle was instead observed in Se-Y samples as compared with NaSe (0.85 v. 0.47 mg/kg DM; P < 0.05). Meat quality evaluation was carried out on LT samples after 6 and 11 days of ageing under a vacuum package. Regardless of ageing time, meat from young bulls supplemented with Se yeast had higher colour lightness (L*) values than those receiving NaSe (38.1 v. 36.6; P < 0.01) and showed a significant decrease in shear force (3.69 v. 4.22 kg/cm2; P < 0.01). The outcomes of the study suggest that the provision of Se yeast throughout the finishing period is a strategy to increase the benefits of the replacement of sodium selenite with organic selenium in beef cattle.

Keywords

selenium sourcebeef cattlefatteningmeat quality
Type
Full Paper
Information
animal , Volume 5 , Issue 10 , 26 August 2011 , pp. 1531 - 1538
Copyright
Copyright © The Animal Consortium 2011

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