Abstract

RIOS RINCON, Francisco Gerardo et al. Post stunning factors that influence emesis in cattle. Rev. mex. de cienc. pecuarias [online]. 2012, vol.3, n.3, pp.343-356. ISSN 2448-6698.

To determine the effect of lairage duration, stunning effectiveness, type of commercial cattle, and ruminal content consistence on carcass contamination by emesis at slaughter between stunning and exsanguinations (stun-stick interval), data were analysed from 9,446 animals in Federal Inspection and Municipal slaughterhouses (P1, P2, P3, P4). Lairage duration was classified in three categories: T1) less than 3 h; T2) major than 3 h and lesser than 12 h, and T3) major than 12 h. Stunning was classified as effective and no effective. The consistence or ruminal content was identified and evaluated as watery, semi-watery and dense. Was recorded at P1, number of heads and lungs contaminated; data analysis by X². On P2 y P3, the frequencies obtained were analyzed with logistic regression. In P4 data were disposed in frequency tables and analysed by X². Long lairage time (T3) with ineffective stunning increased 1.73 times the risk to observe carcass contamination. At the long lairage time (T3), emesis increased (P<0.05), when ruminal content was watery (62.9 % vs 12.5 y 24.6 %). The emesis was similar between male and female (P=0.10; 10.07 %). There was not relationship (P=0.58) between repose time and type of commercial cattle in emesis. It is concluded that high lairage duration, no effective stunning, and watery and semi-watery content ruminal consistence, increased the emesis in stun-stick interval bovine slaughtering.

Keywords : Carcass contamination; Liragetime; Stun-stick interval; Cattle.

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