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LD2668 .T4 1949 W32 / Master of Science

LD2668 .T4 1949 W49 / Master of Science

Procurou-se verificar a importância da miopatia exsudativa e despigmentada dentro das carnes suínas classificadas em nosso meio como insuficientes. Foram examinadas 87 amostras de lombo, pernil e paleta. A inspeção macroscópica das regiões nobres foi acompanhada da avaliação de algumas características físico-químicas além de exames histológicos nos músculos subscapularis, longissimus dorsi e massa muscular formada pela fusão dos músculos adductor e gracilis em amostras atingidas e não atingidas pela afecção. O estudo também se estendeu às áreas contíguas às lesões das amostras parcialmente afetadas. Verificou-se que as regiões atingidas da carcaça apresentaram lesões visíveis após o abate, observando-se áreas pálidas e exsudativas em 34.4 por cento dos lombos, 27,5 por cento dos pernis e 10,3 por cento das paletas. A afecção manifestou-se com maior intensidade nos lombos (20 por cento ) e pernis (12.5 por cento ). Nas paletas não foram observadas lesões acentuadas. Os exames laboratoriais confirmaram que as amostras provenientes de áreas atingidas apresentavam alterações características da miopatia exsudativa e despigmentada dos suínos. O pH das carnes afetadas, 45 minutos após o abate foi menor que o das carnes normais. Nas áreas atingidas, apesar dos valores para a umidade total permanecerem inalterados, houve maior perda de líquido das fibras musculares devido a diminuição do seu poder de retenção hídrico. Constatou-se, ademais, que nas áreas contíguas às lesões, apesar da musculatura ainda apresentar aparência macroscopica normal, as características físico-químicas e as estruturas histológicas já estavam modificadas com tendência a evidenciar as alterações típicas da afecção em estudo. As fibras musculares revelavam áreas acidófilas, desaparecimento das estriações e no caso das lesões graves as mesmas apresentavam-se fragmentadas. Esses dados permitiram-nos concluir que carcaças de suínos do tipo comum, usualmente destinados ao abate no Brasil, são passíveis de apresentarem lesões devidas à miopatia exsudativa e despigmentada. / The importance of the pale, soft and exudative muscle was studied in the pork considered insufficient in our country. Eighty-seven (87) samples of loin, ham and shoulder-blade were examined. The macroscopic inspection of these pieces was followed by some physico-chemical exams besides some histological exams in the subscapularis longissimus dorsi muscles and in the muscular portion formed by the adductor and gracilis muscles in affected and normal samples. The adjoining areas next to the injured ones were also studied. It was also verified that the affected regions in the carcasse presented visible damages after the slaughter by finding pale and exudative areas in 34,4 per cent of loins, 27,5 per cent of hams and 10,3 per cent of shoulder-blades. The affection was more intense in the loins (20 per cent ) and hams (12,5 per cent ). Bigger damages were not observed in the shoulder-blades. The laboratorial exams confirmed that the samples come from affected areas presented characteristic changes of the pale, soft and exudative muscle. Forty-five (45) minutes after the slaughter the pH of the watery pork was less than in the normal meat. Affected areas presented moisture content unaltered in spite of water holding capacity decreasing. It was also verified that in the adjoining areas the macroscopic appearance was still normal in spite of the physico-chemical characteristics and histological structures being modified with a tendency to show the typical changes of the affection. The muscular fibers showed acidophile areas, without striations and in the serious damages the fibers were broken. Through these data we may conclude that the carcasses of common swine, normally sent to slaughter in Brazil may present injuries because of the pale, soft and exudative condition.

Photocopy of typescript. / Digitized by Kansas Correctional Industries

Photocopy of typescript. / Digitized by Kansas Correctional Industries

Procurou-se verificar a importância da miopatia exsudativa e despigmentada dentro das carnes suínas classificadas em nosso meio como insuficientes. Foram examinadas 87 amostras de lombo, pernil e paleta. A inspeção macroscópica das regiões nobres foi acompanhada da avaliação de algumas características físico-químicas além de exames histológicos nos músculos subscapularis, longissimus dorsi e massa muscular formada pela fusão dos músculos adductor e gracilis em amostras atingidas e não atingidas pela afecção. O estudo também se estendeu às áreas contíguas às lesões das amostras parcialmente afetadas. Verificou-se que as regiões atingidas da carcaça apresentaram lesões visíveis após o abate, observando-se áreas pálidas e exsudativas em 34.4 por cento dos lombos, 27,5 por cento dos pernis e 10,3 por cento das paletas. A afecção manifestou-se com maior intensidade nos lombos (20 por cento ) e pernis (12.5 por cento ). Nas paletas não foram observadas lesões acentuadas. Os exames laboratoriais confirmaram que as amostras provenientes de áreas atingidas apresentavam alterações características da miopatia exsudativa e despigmentada dos suínos. O pH das carnes afetadas, 45 minutos após o abate foi menor que o das carnes normais. Nas áreas atingidas, apesar dos valores para a umidade total permanecerem inalterados, houve maior perda de líquido das fibras musculares devido a diminuição do seu poder de retenção hídrico. Constatou-se, ademais, que nas áreas contíguas às lesões, apesar da musculatura ainda apresentar aparência macroscopica normal, as características físico-químicas e as estruturas histológicas já estavam modificadas com tendência a evidenciar as alterações típicas da afecção em estudo. As fibras musculares revelavam áreas acidófilas, desaparecimento das estriações e no caso das lesões graves as mesmas apresentavam-se fragmentadas. Esses dados permitiram-nos concluir que carcaças de suínos do tipo comum, usualmente destinados ao abate no Brasil, são passíveis de apresentarem lesões devidas à miopatia exsudativa e despigmentada. / The importance of the pale, soft and exudative muscle was studied in the pork considered insufficient in our country. Eighty-seven (87) samples of loin, ham and shoulder-blade were examined. The macroscopic inspection of these pieces was followed by some physico-chemical exams besides some histological exams in the subscapularis longissimus dorsi muscles and in the muscular portion formed by the adductor and gracilis muscles in affected and normal samples. The adjoining areas next to the injured ones were also studied. It was also verified that the affected regions in the carcasse presented visible damages after the slaughter by finding pale and exudative areas in 34,4 per cent of loins, 27,5 per cent of hams and 10,3 per cent of shoulder-blades. The affection was more intense in the loins (20 per cent ) and hams (12,5 per cent ). Bigger damages were not observed in the shoulder-blades. The laboratorial exams confirmed that the samples come from affected areas presented characteristic changes of the pale, soft and exudative muscle. Forty-five (45) minutes after the slaughter the pH of the watery pork was less than in the normal meat. Affected areas presented moisture content unaltered in spite of water holding capacity decreasing. It was also verified that in the adjoining areas the macroscopic appearance was still normal in spite of the physico-chemical characteristics and histological structures being modified with a tendency to show the typical changes of the affection. The muscular fibers showed acidophile areas, without striations and in the serious damages the fibers were broken. Through these data we may conclude that the carcasses of common swine, normally sent to slaughter in Brazil may present injuries because of the pale, soft and exudative condition.

Typescript. / Digitized by Kansas Correctional Industries

Typescript (photocopy). / Digitized by Kansas Correctional Industries

Two experiments were conducted to study the antibody response of pigs challenged with the general antigen sheep red blood cells (SRBC). In one experiment SRBC's were injected at one of four sties: intramuscularly into the neck, intramuscularly into the ham, subcutaneously into the fore flank or rear flank. These treatments were repeated four weeks later. The antibody responses to the four treatments were determined by microtiter and analyzed statistically. No significant (P> 0. 10) differences were found among responses to the four treatments during the fourth and eighth weeks after injections, but a significant (P<0.05) difference was found during the fifth week among all four groups. Coefficients of correlation showed highly significant (P<.0.01) relationships between SRBC antibody titer during the fourth week after injections and increase in weight of test animals from the beginning of the study until slaughter. In a second experiment pigs were given intramuscularly either 2 milliliters of a 5% or 4 milliliters of a 10% SRBC suspension to determine the optimum dosage level. The difference between the antibody responses to these two treatments was not significant (P)0.10). Results of this study indicate that when challenging hogs with SRBC, any of the commonly used sites for injection is acceptable. The injection of 2 milliliters of a 5% SRBC suspension is sufficient to obtain antibody titers which differentiate among individuals. Coefficients of correlation indicate a relationship may exist between SRBC antibody titer and some economically important traits.