Influência do tempo de transporte para juvenis de pacamã (Lophiosilurus alexandri)

The aim of this work was to evaluate different transport times for pacama juvenile (Lophiosilurus alexandri) previously trained to feed formulated diets. Four hundred and eighty-six pacama juveniles (2.52±0.71g) were submitted to 24 hours of fasting before transport. The animals were divided into nine plastic bags, with density of 54 juveniles in 5L of clean water for each bag after that inflated with pure oxygen and then sealed. Fish were transported for three hours and bags were open at 5, 6 and 7.5 hours after closing. For each time three replications were used. Survival was monitored for 96 hours post-transport. The longest time tested showed the lowest values of dissolved oxygen and pH, while the total ammonia was similar in the different treatments. Survival was 100% for different transport times after 96 hours. Some juveniles returned to feed 48 hours and the majority 72 hours after opening the bags, suggesting the efficiency of transport made at different times

Crecimiento y supervivencia de postlarvas de piracanjuba "(Brycon orbignyanus)"

This work was conducted in the fish laboratory of the Environmental Station of Itutinga, CEMIG in January 2002. The objective was to evaluate the behavior of piracanjunba (Brycon orbignyanus) post-larvae at different stocking densities and feeding frequencies. The post-larvae were manteined into eighteen plastic rectangular- shaped boxes of 30 liters of volume. All the boxes posessed individual supply and flow of water with a constant renewal, and water temperature controlled (27°C), trough a heating system of the sort utilized in thermal pools. The experimental treatments consisted of three stocking densities (10, 20 and 30 post-larvae/liter) and two feeding frequencies (every 3 and 6 hours). The design was completely randomized with the treatments arranged into a 3 x 2 factorial scheme (stocking density x feeding frequency) with three replicates per treatment. The results showed that the increase of stocking density reduced linearly the fish"s survival. There were significant differences (p0,05). De acuerdo con los resultados, se concluye que la mejor supervivencia se obtiene con la densidad de 10 postlarvas/litro de piracanjuba, alimentadas de tres en tres horas

Efeito dos níveis de energia para poedeiras comerciais no período final de produção sobre o desempenho, a conversão alimentar e energética e a qualidade de ovos

Foram utilizadas 1200 poedeiras comerciais da linhagem Lohmann LSL, com 64 semanas, em gaiolas convencionais. Estas foram divididas em cinco grupos, de acordo com o nível de energia metabolizável aparente corrigida pelo nitrogênio (EMAn) presente em sua dieta: 2700kcal/kg; 2775kcal/kg; 2850kcal/kg; 2925kcal/kg; e 3000kcal/kg, com seis repetições. As aves receberam as rações, á base de milho e farelo de soja, por 16 semanas. O delineamento experimental foi inteiramente ao acaso, e as médias foram submetidas à regressão polinomial e ao teste de Kruskal-Wallis. O aumento de EMAn não exerceu efeito sobre a produção, a massa e o peso de ovos, bem como sobre o peso das aves e a viabilidade. O consumo de ração diminuiu de acordo com o aumento na energia da dieta, porém a conversão energética foi pior com esse aumento. Em contrapartida, a conversão alimentar melhorou o aumento dos níveis de EMAn. O consumo de EMAn é constante independentemente do seu nível dietético. Não há diferença nas unidades Haugh, nos sólidos da gema e na porcentagem dos componentes do ovo. O peso específico melhora com o aumento dos níveis de EMAn. Os níveis nutricionais para poedeiras velhas podem estar sendo superestimados

Performance and nutrient utilization in South American juvenile catfish Pseudoplatystoma spp. weighting 89 - 170g, fed at different energy and protein levels

Most studies in nutrition for the South American catfish (surubim) were limited to the initial phase of development. However, it is clear that performance and nutrient utilization can change during the life stages of a fish. Therefore, this study aimed to evaluate the performance and nutrient utilization in juveniles of surubim fed diets varying in protein and energy levels. Two experiments were performed to test different levels of energy and protein in formulated diets. In the first experiment, surubim juveniles (89.2±4.8g) were fed five diets containing different levels of energy (18.0, 18.8, 19.6, 20.5, 21.3 MJ/kg). In the second experiment, juveniles (170.03±3.35g) were fed five diets containing different levels of protein (360, 400, 440, 480 and 520g/kg). The most favorable energy level for weight gain was 20.3 MJ/kg. The increasing energy levels provided a rise in fat and decrease in protein whole-body composition. The protein amount was between 360 to 400g/kg (383g/kg), which was adequate for performance and nutrient assimilation in surubim juveniles