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Quantitative study of the α- and γ-tocopherols accumulation in muscle and backfat from Iberian pigs kept free-range as affected by time of free-range feeding or weight gain

Published online by Cambridge University Press:  13 March 2007

A. I. Rey ,
A. Daza ,
C. López-Carrasco  and
C. J. López-Bote
A. I. Rey*
Affiliation:
Departamento de Producción Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Spain
A. Daza
Affiliation:
Departamento de Producción Animal, Escuela de Ingenieros Agrónomos, Universidad Politécnica Madrid, Spain
C. López-Carrasco
Affiliation:
Centro de Investigaciones Agropecuarias ‘Deheso'n del Encinar’. Junta de Comunidades de Castilla la Mancha, Oropesa, Toledo, Spain
C. J. López-Bote
Affiliation:
Departamento de Producción Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Spain
*
† E-mail: Anarey@vet.ucm.es
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Abstract

The experiment was undertaken to quantify the α and γ-tocopherols accumulation in muscle and backfat from Iberian pigs given food free-range as affected by the time of free-range feeding or the weight gained during the fattening in free-range. Pigs were given their food in a free-range production system with pasture and acorns (Quercus rotundifolia) for different periods of time: 46 days (free-range 3), 83 days (free-range 2) and 111 days (free-range 1). A control was given food free-range for 0 days. In addition another experiment was developed to determinate the effect of the the weight gained on the tocopherols accumulation at a similar period of time (111 days) given food free-range: one group gained 68·7 kg of weight (free-range A) and the other 43·6 kg (free-range B). The concentration of γ-tocopherol significantly (P<0·0001) increased after 83 days of feeding in the longissimus dorsi (LD) and biceps femoris (BF) muscles, and after 111 days in the inner and outer backfat layers. The concentration of α-tocopherol was not statistically affected by the days of free-range feeding in any case. Iberian pigs that put on more weight had significantly (P< 0·0001) higher concentration of α and γ-tocopherols in the inner and outer backfat layers, and α-tocopherol in the BF muscle than those given food free-range B. However, no differences were detected in the proportion of α-tocopherol in the LD and γ-tocopherol in the LD and BF. The γ-tocopherol content of LD and BF muscles depending on the days of feeding were adjusted to linear and quadratic regressions (R2=0·8705 and 0·8697, respectively), while the outer and inner backfat layers were linear equations (R2=0·8480 and 0·8119, respectively). However, the γ-tocopherol concentration as affected by the weight gained in free-range showed in all tissues a linear and a quadratic trend that were adjusted to exponential responses. The α-tocopherol content was affected by the γ-tocopherol concentration in muscle and outer backfat layer. The tocopherol concentration (α and γ-tocopherols) in the backfat layers may discriminate better between the pigs of high quality that were given food free-range for a long period of time and those that stayed an intermediate period. However, to discriminate between the pigs on formulated food and those given food free-range, the quantification of the γ-tocopherol concentration in muscle could be a better indicator.

Keywords

free-range husbandrylive-weight gainpigstocopherols
Type
Research Article
Information
Animal Science , Volume 82 , Issue 6 , December 2006 , pp. 901 - 908
Copyright
Copyright © British Society of Animal Science 2006

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