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Effect of supplementation with MgCO3 and L-tryptophan on the welfare and on the carcass and meat quality of two halothane pig genotypes (NN and nn)

Sixty-one animals with different Halothane genes (homozygous halothane positive, n=34; and homozygous halothane negative, n=27) were fed with three diets (controlgroup, with no supplement; magnesium (Mg) group with 1.28g MgCO3/kg and tryptophan (Trp) group with 5g L-Trp/kg) during the last 5 days before slaughter. Animals were submitted to minimal stress ante mortem conditions. Pig behaviour was recorded at the experimental farm, raceway to the CO2 stunning system and during the stunning period. Corneal reflexes were recorded after stunning as well. There were no differences in feed intake among diets (p>0.05) during the 5 days of treatment. The halothane positive (nn) group had lower intake than the halothane negative (NN) group (p<0.01). The behaviour of the pigs in the raceway did not differ (p>0.05) among treatments or halothane genotype. A significant (p<0.001) interaction diet*halothane was found in the time to appear the first retreat attempt during the exposure to the CO2 system. In the nn group, the time of performing the first retreat attempt was later in the Mg (p<0.05) than the Control group. Moreover, in the Mg group, the nn had a later (p<0.05) first retreat attempt than the NN. Thus, Mg supplementation could have a positive effect on welfare of nn pigs. The nn had a lower proportion of animals that showed corneal reflexes after stunning than NN, indicating a higher effectiveness of the stunning method in nn pigs. Neither Mg nor Trp affected carcass quality and meat quality parameters, although significant differences were found between genotypes

© Livestock Science, 2008, vol. 115, núm. 2, p. 107-117

http://hdl.handle.net/10803/37381

Elsevier

Author: Panella-Riera, Núria
Dalmau Bueno, Antoni
Fàbrega Romans, Emma
Font i Furnols, Maria
Gispert i Negrell, Maria Assumpta
Tibau Font, Joan
Soler Soler, Joaquim
Velarde, Antonio
Oliver Pratsevall, M. Àngels
Gil Farré, Marta
Date: 2008
Abstract: Sixty-one animals with different Halothane genes (homozygous halothane positive, n=34; and homozygous halothane negative, n=27) were fed with three diets (controlgroup, with no supplement; magnesium (Mg) group with 1.28g MgCO3/kg and tryptophan (Trp) group with 5g L-Trp/kg) during the last 5 days before slaughter. Animals were submitted to minimal stress ante mortem conditions. Pig behaviour was recorded at the experimental farm, raceway to the CO2 stunning system and during the stunning period. Corneal reflexes were recorded after stunning as well. There were no differences in feed intake among diets (p>0.05) during the 5 days of treatment. The halothane positive (nn) group had lower intake than the halothane negative (NN) group (p<0.01). The behaviour of the pigs in the raceway did not differ (p>0.05) among treatments or halothane genotype. A significant (p<0.001) interaction diet*halothane was found in the time to appear the first retreat attempt during the exposure to the CO2 system. In the nn group, the time of performing the first retreat attempt was later in the Mg (p<0.05) than the Control group. Moreover, in the Mg group, the nn had a later (p<0.05) first retreat attempt than the NN. Thus, Mg supplementation could have a positive effect on welfare of nn pigs. The nn had a lower proportion of animals that showed corneal reflexes after stunning than NN, indicating a higher effectiveness of the stunning method in nn pigs. Neither Mg nor Trp affected carcass quality and meat quality parameters, although significant differences were found between genotypes
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Citation: Panella-Riera, N., Dalmau, A., Fàbrega, E., Font i Furnols, M., Gispert, M., Tibau, J., et al. (2008). Effect of supplementation with MgCO3 and L-tryptophan on the welfare and on the carcass and meat quality of two halothane pig genotypes (NN and nn). Livestock Science, 2008, 115 (2), 107-117. Recuperat 26 octubre de 2011, a http://www.journals.elsevierhealth.com/periodicals/livsci/home
ISSN: 1871-1413
Document access: http://hdl.handle.net/10256/3663
Language: eng
Publisher: Elsevier
Collection: Versió postprint del document publicat a: http://dx.doi.org/10.1016/j.livsci.2007.06.014
Articles publicats (D-EQATA)
Is part of: © Livestock Science, 2008, vol. 115, núm. 2, p. 107-117
See also: http://hdl.handle.net/10803/37381
Rights: Tots els drets reservats
Subject: Carn de porc -- Anàlisi
Porcs -- Alimentació
Pork -- Anàlisi
Swine -- Feeding and feeds
Title: Effect of supplementation with MgCO3 and L-tryptophan on the welfare and on the carcass and meat quality of two halothane pig genotypes (NN and nn)
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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