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Pre-slaughter social activity of young bulls relating to the occurrence of dark-cutting beef

Published online by Cambridge University Press:  02 September 2010

C. Franc ,
L. Bartoš ,
Z. Hanyš  and
Z. Tomeš
C. Franc
Affiliation:
Research Institute of Animal Production, 104 00 Praha 10 — Uhříněves, Czechoslovakia
L. Bartoš
Affiliation:
Research Institute of Animal Production, 104 00 Praha 10 — Uhříněves, Czechoslovakia
Z. Hanyš
Affiliation:
Research Institute of Animal Production, 104 00 Praha 10 — Uhříněves, Czechoslovakia
Z. Tomeš
Affiliation:
Research Institute of Animal Production, 104 00 Praha 10 — Uhříněves, Czechoslovakia
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Abstract

Twenty bulls of three different breeds were tethered individually from 5 months until slaughter at 21 months. On the day of slaughter, the bulls were divided into groups of five animals, transported and then released in a pen. The first bull of the group was slaughtered 60 or 110 min after regrouping. Subsequent bulls were slaughtered individually at 50-min intervals. Social interactions among the bulls were recorded. Muscle pH, light reflectance values and water-holding capacity were measured in samples of m. longissimus dorsi. These characteristics showed correlations with the amount of non-agonistic social activity in which a bull had been involved before slaughter. The characteristics were also correlated with the number of agonistic interactions. Whether a bull was behaving as a dominant or a submissive animal did not influence the incidence of dark-cutting meat as judged by pH values. On the other hand, light reflectance values and water-holding capacity were correlated with the number of passive agonistic interactions (i.e. how many times a bull was attacked) and considerably less with the number of active interactions (number of attacks by the bull). The incidence of butting was not significantly related to muscle characteristics but mounting was significantly correlated with them.

The study indicates that dark-cutting beef is primarily caused by physically exhausting activities such as mounting, and further modified by stress-inducing social interactions.

Type
Research Article
Information
Animal Production , Volume 46 , Issue 2 , April 1988 , pp. 153 - 161
Copyright
Copyright © British Society of Animal Science 1988

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