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Effect of gender, terminal sire line and age at slaughter on performance, carcass characteristics and meat quality of heavy pigs

Published online by Cambridge University Press:  18 August 2016

M. A. Latorre ,
P. Medel ,
A. Fuentetaja ,
R. Lázaro  and
G. G. Mateos
M. A. Latorre
Affiliation:
Departamento de Producción Animal, Universidad Politécnica de Madrid, Ciudad Universitaria, 28040 Madrid, Spain
P. Medel*
Affiliation:
Departamento de Producción Animal, Universidad Politécnica de Madrid, Ciudad Universitaria, 28040 Madrid, Spain
A. Fuentetaja
Affiliation:
COPESE S. A., 40300 Sepúlveda, Segovia, Spain
R. Lázaro
Affiliation:
Departamento de Producción Animal, Universidad Politécnica de Madrid, Ciudad Universitaria, 28040 Madrid, Spain
G. G. Mateos*
Affiliation:
Departamento de Producción Animal, Universidad Politécnica de Madrid, Ciudad Universitaria, 28040 Madrid, Spain
*
† Present address : Imasde Agropecuaria S.L.Isabel Colbrand, 10, 4a pl.local 90, 28050 Madrid, Spain.
† Present address : Imasde Agropecuaria S.L.Isabel Colbrand, 10, 4a pl.local 90, 28050 Madrid, Spain.
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Abstract

Two hundred and forty pigs of 56 ± 3 days of age were used to investigate the effects of sex (barrows; gilts), boar sire (DD, Danish Duroc; ND × LW, Dutch Duroc × Large White ; P × LW, Pietrain × Large White) and slaughter age (160; 175 days) on performance and carcass and meat quality. Treatments were arranged factorially (2 × 3 × 2) and there were four replicates (five pigs per replicate) per treatment. The female line was Landrace × Large White in all cases. Barrows had greater daily food intake (P <0·001) and average daily gain (P <0·01) and had poorer food conversion ratio (P <0·001) than gilts. Carcasses from castrates were fatter and had a lower yield of trimmed lean cuts than carcasses from females (P <0·001). Longissimus muscle from barrows had more intramuscular fat and higher a* value than muscle from gilts (P <0·05). Pigs from DD sire line grew faster (P <0·05) and had a better food conversion ratio (P <0·001) than pigs from the other two lines. Dressing proportion and backfat thickness were greatest for P × LW sired pigs (P <0·01) and proportion of trimmed lean cuts was greater for DD and P × LW than for ND × LW sired pigs (P <0·01). Longissimus muscle from DD sired pigs had less protein (P <0·01) and more intramuscular fat (P <0·001) than muscle from the remaining lines. Longissimus muscle from P × LW line had more intense colour than muscle from DD and ND × LW lines (P <0·01). Pigs slaughtered at 175 days had poorer food conversion ratio (P <0·01) and less trimmed primal cut proportion (P <0·001) than pigs slaughtered at 160 days. Also, increasing the age at slaughter increased intramuscular fat content (P <0·01), a* value (P <0·001) and colour intensity of the muscle (P <0·01). Danish Duroc boars are a good alternative to ND × LW or P × LW boars for production of heavy pigs whether the crossbreds are sacrificed at 160 or 175 days. Also, an increase in age at slaughter impairs growth efficiency and yield of lean cuts but improves some aspects of meat quality, which might be of interest in the production of heavy pigs destined for the dry-cured product industry.

Keywords

carcass qualitygenotypegrowthmeat qualitypigs
Type
Growth, development and meat science
Information
Animal Science , Volume 77 , Issue 1 , August 2003 , pp. 33 - 45
Copyright
Copyright © British Society of Animal Science 2003

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