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Influência do grupo genético, condição sexual e tratamento antiparasitário nas medidas de área de olho do lombo e espessura de gordura in vivo e na carcaça de bovinos de corte [Influence of breed, gender condition, and anti-parasitic RESUMOForam estudados 48 bovinos machos oriundos de inseminação artificial, criados em pasto, sendo 24 (12 Nelore e 12 F1 ½ Red Angus-Nelore ) tratados com antiparasitários alopáticos e 24 (mesmo número de puros e cruzados) tratados com o antiparasitário bioterápico Fator C&MC. Os animais foram desmamados aos oito meses, metade de cada subgrupo genético (6) foi castrado aos 13 meses e todos abatidos aos 32 meses, com o objetivo de verificar a influência do tratamento antiparasitário, do grupo genético e da condição sexual sobre as medidas de área de olho de lombo (AOL) e espessura de gordura de lombo (EGL). Usaram-se medidas de ultrassonografia no animal vivo (AOLU e EGLU) e na carcaça, plástico quadriculado e paquímetro (AOLC e EGLC). Os animais F1, os inteiros e os tratados com alopatia apresentaram peso vivo maior quando comparados aos Nelores, castrados e tratados com bioterápicos. Não houve diferença da AOLU e AOLC entre os grupos genéticos. EGLC foi mais alta nos cruzados. Os animais inteiros apresentaram AOLU e AOLC maiores que os castrados, e EGLU e EGLC menores. Foram altamente significativos os coeficientes de correlação entre as medidas por ultrassom e na carcaça para área de olho de lombo (0,87) e espessura de gordura do lombo (0,95). Palavras

Nine male turkey breasts with bone were frozen at −18C, cut, vacuum‐packed and irradiated with gamma rays (1 kGy and 3 kGy doses) and stored for 540 days at −18C. During that time, bacteriological, physical and chemical analyses as well as a sensory evaluation were conducted after 5, 180, 360 and 540 days of storage. The psychrophiles counts and the counts of Enterococcus spp. increased during the storage period; moreover, the count was lower because of the irradiation by gamma rays, especially at a dose rate of 3 kGy. The lipid oxidation increased according to the irradiation dose used and the storage time. In the beginning of the storage, the gamma radiation helped to reduce the sensory acceptance of the meat taste, especially when the sample was subjected to a dose of 3 kGy, which was then confirmed as the one with the greatest lipid oxidation. PRACTICAL APPLICATIONS Decontamination of food by ionizing radiation is a safe, efficient, environmentally clean and energy‐efficient process. Irradiation is particularly valuable as an end product decontamination procedure. Radiation treatment is an emerging technology and more and more clearances on radiation‐decontaminated foods are issued or expected to be granted in the near future. The information derived from this study serves as an essential base of knowledge from an alternative technology for food treatment that is being adopted worldwide and contributes to the development of the research in the practical application of food irradiation. It also can provide clues to understanding the factors that affect the irradiation process on the turkey meat preservation and can indicate means of reducing or eliminating pathogenic bacteria including Enterococcus spp. as well as Pseudomonas aeroginosa, bacteria related to the reduction of food commercial life, from suspected food products without affecting sensory, nutritional and technical qualities.

A non-surgical sterilant (NSS) was used with the objective of assessing the zootechnical performance, carcass and meat quality, and hormone levels. 90 male piglets were selected with birthweights varying between 1.5kg to 2.0kg. The control group was constituted of 45 males castrated by the conventional surgical method, at the seventh day of age, and the treated group was constituted of 45 males castrated with NSS (active principle of zinc gluconate in the concentration of 26.2mg/mL associated to the dimethyl sulfoxide at 0.5%), with the application of the first dose on the seventh day of age and the second dose on the fourteenth day of age. The zootechnical assessments were carried out on the farm and consisted: weight gain in the periods per animal and feed conversion. The slaughter of the animals and the assessment of the carcass and meat quality and hormone levels were carried out in a slaughterhouse and the municipality of Campinas (SP). The study demonstrated that the use of NSS was a viable alternative in relation to the zootechnical performance and the carcass quality. In relation to the meat quality there was no significant difference in the majority of the assessed parameters.Keywords: swine, zinc gluconate, androstenone, feed conversion, carcass yield RESUMO Foi utilizado esterilizante não cirúrgico (ENC) com

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