Effect of electrical stunning frequency and current waveform in poultry welfare and meat quality.

This study aimed to evaluate the effects of different stunning frequencies and electrical current waveforms on chicken welfare and meat quality. Two-hundred-thirty-two Cobb broilers, 48 d of age and 2.76 ± 0.47 live-weight, were randomly assigned into 4 stunning treatments - 2 frequencies (300 Hz and 650 Hz) and 2 current waveforms (direct current [DC] and alternating current [AC]). Broilers were electrically stunned in a water bath in a commercial slaughterhouse (70 V, 100 mA). The electronarcosis and stunning efficiency were confirmed by assessment of visual parameters (absence of rhythmic breathing, ocular reflex, and coordinated wing flapping) and blood parameters (lactate, glucose, creatine kinase, sodium, and potassium), which were measured after bleeding. The incidence of traumas and injuries was assessed after plucking. Meat quality analysis was performed in Pectoralis major (PM), with determinations of pH, breast yield (PMY), water holding capacity (WHC), water absorption capacity (WAC), thawing loss (DL), cooking loss (CL), shear force (SF), and instrumental color (a*, b*, L*, C*, and h). The interaction between waveform and frequency was significant (P < 0.05) only for lactate, sodium, and lightness (L*). Lactate and sodium levels decreased at 300 Hz-DC. Meat lightness increased at 300 Hz-DC. The individual effect of frequency was significant for glucose, creatine kinase, potassium, WHC, PMY, b*, C*, and h. Regarding waveform, AC decreased plasma glucose and DC decreased creatine kinase and WAC. In general, stunning frequency exerts greater influence than waveform on the welfare and meat quality parameters of broilers. The use of frequency at 650 Hz proved to render animals efficiently unconscious and to promote greater meat quality.

Ensino de bem-estar e dor animal em cursos de medicina veterinária no Brasil / Teaching pain and animal welfare in Veterinary Medicine courses in Brazil

Currículos de medicina veterinária devem disponibilizar ferramentas para que os futuros profissionais atendam a demanda da sociedade, que inclui preocupações diretas com os animais. O objetivo deste trabalho foi traçar um perfil do panorama geral do ensino da medicina veterinária em relação a questões de bem-estar e dor animal. O método utilizado foi análise de documentos disponíveis online e coleta de dados via aplicação de questionários para coordenadores de curso de medicina veterinária. A descrição do curso, sua grade curricular e ementário foram estudados. Observou-se que 46% das 94 instituições estudadas apresentavam a disciplina de bem-estar animal e 26% ofereciam a disciplina de etologia. Houve evidência de que há uma pronta relação com a esfera física do bem-estar animal, sendo que as outras duas esferas, comportamental e psicológica, não recebem atenção similar ao longo dos cursos. Na avaliação do ementário, o termo "bem-estar animal" é empregado com caráter difuso e o termo "dor" encontra-se presente em 54% dos cursos estudados, relacionado principalmente a disciplinas de patologia, fisiologia, farmacologia e anestesiologia. Conclui-se que o ensino brasileiro de medicina veterinária enfatiza a esfera física do bem-estar animal, sendo importante o enriquecimento em relação às esferas comportamental e psicológica e ao ensino da dor.

The curricula of veterinary medicine should provide tools for future professionals to meet society demands, which include direct concerns for the animals. The overall scenario of education in veterinary medicine on issues of animal welfare and pain was studied. This study was conducted through the analysis of documents available online and via questionnaires to coordinators of veterinary medicine programs. The program description, its curriculum and course content descriptions were considered. Results show that 46% of the 94 institutions studied offer an animal welfare course and 26% offer an ethology course. We observed a direct relationship with the physical component of animal welfare; the other two components, the behavioral and psychological ones, do not receive similar attention throughout the programs. In the study of course contents of the veterinary programs, the term 'animal welfare' is used in a diffuse manner and the term 'pain' appears in 54% of the programs studied, mainly related to disciplines covering its pathology, physiology, pharmacology and anesthesiology. We conclude that in the teaching of veterinary medicine in Brazil there is an emphasis on the physical realm of animal welfare, and that there is room for improvement in the naturalness and psychological realms and in the teaching of pain.