POST-EMBRYONARY DEVELOPMENT OF Cochliomyia macellaria (FABRICIUS) (DIPTERA: CALLIPHORIDAE) REARED ON NATURAL DIETS PROCESSED IN CONTROLLED CONDITIONS. The performance of Cochliomyia macellaria (Fabricius) immature forms was evaluated in experimental conditions. Larvae were reared on equine meat and of sardine diets stored in an oven at 30 °C for different periods of time. Fresh diets lots were first stored in a freezer (- 15 °C) and transferred to a refrigerator for 24 hours. Portions of the equine meat and of the sardine were then sucessively stored at 30 °C for 96, 72, 48 and two hours, and, 72, 48, 24 and two hours, respectively. One sample was caracterized by the maintence of the diet in refrigerator, among 11 days, when red meat was utilized. One-hundred g diet in 4 replications/ treatment and 2 g diet per 1 larva ratio were used. The postfeeding larvae were separated and weighed individually. The rate of postembryonic development was not homogenously affected by previous storage of the diet at 30 °C, using horse meat. An expressive percentual of postfeeding larvae obtained from the substrates processed for 48 and 96 hours weighed less than 60,0 mg. The emergence of adults stayed between 73 e 97%. The rate of postembryonic development was reduced when the sardine diet was used previously maintened at 30°C for 72 hours. The postfeeding larvae obtained from the substrates processed, in this temperature, for two, 24 e 48 hours weighed between 57,0 and 65,0 mg. The mean weight of specimens from the remaining treatment was significantly lower (50,0 mg). The rate of immature forms survival ranged from 68 - 88 %

RESUMO O desempenho dos imaturos de Cochliomyia macellaria (Fabricius) foi avaliado sob condições de laboratório. As larvas foram criadas em dietas a base de carne equina e sardinha, previamente armazenadas a 30°C de temperatura, por diferentes intervalos. As duas fontes alimentares foram, inicialmente, mantidas em freezer (-15°C) e, posteriormente, transferidas para um refrigerador, onde foram estocadas durante 24 horas. Após este período, foram sucessivamente expostas a 30°C por 96, 72, 48 e duas horas e, 72, 48, 24 e duas horas, respectivamente. Uma amostra de carne vermelha foi caraterizada pela manutenção apenas em refrigerador, durante 11 dias. Utilizaram-se 100 g de dieta por repetição/ tratamento, considerando-se a relação de 1 larva: 2 g de dieta. Após o abandono espontâneo das dietas, as larvas foram individualizadas, permitindo o registro unitário da massa corporal. A taxa de desenvolvimento pós-embrionário não foi homogeneamente afetada pela utilização da carne equina previamente armazenada a 30°C de temperatura. Um expressivo percentual de larvas maduras oriundas deste substrato, processado durante 48 e 96 horas, registrou massas corporais inferiores a 60,0 mg. A emergência de adultos oscilou entre 73 e 97%. A taxa de desenvolvimento pós-embrionário foi reduzida ao utilizar-se a dieta a base de sardinha previamente mantida a 30°C de temperatura por 72 horas. As larvas maduras oriundas desta dieta processada, nas condições previstas, por duas, 24 e 48 horas, apresentaram de 57,0 a 65,0 mg. A massa corporal média obtida pelos espécimens remanescentes foi significativamente menor (50,0 mg). A taxa de sobrevivência dos imaturos, criados em sardinha, oscilou entre 68-88%.

The influence of a diet based on putrid horse meat over the post-embryonic development of Cochliomyia macellaria (Fabricius, 1775) under controlled conditions (UR 65 10% and 14 hours of photophase) was compared with the results obtained using a meat broth diet to which other sources of animal and vegetable protein were added. The flies were maintained at 30ºC, from egg until mature larvae spontaneously abandoned the diet. They were then transfered to a climatized chamber at 27ºC. The larvae and pupae viability and the weight of the mature larvae were significantly inferior, when a diet based on meat broth was used, even though the larvae period was significantly increased with this diet. This type of diet did not charge the time of development of the pupae. The inoculation of the egg mass directly over the diet was recommend, instead of the technique in which the egg masses are transfered to humid filter paper, followed by the handling of the recently ecloded larvae.