Luís Gustavo Tavares Braga

Influência da Temperatura Ambiente no Desempenho da Rã-touro, Rana catesbeiana (Shaw, 1802) na Fase de Recria

An experiment was conducted to evaluate the effect of environmental temperature on the bullfrog performance in the growing phase. Four hundred and fuve frogs, weighing 37,5±1,5 grams, were assigned to a randomized experimental design with three treatments (20,2±0,7°C, 25,1±0,4°C and 30,2±0,5°C), five replicates (boxes) and 27 frogs in each replicate. The experimental period was of 45 days, being ten days for adaptation of the frogs to the installations and the feeding. The daily feeding comprised one commercial ration of trout with 45% of crude protein and a fly larva for attraction. The performance of the animals was evaluated and found that the temperature affected significatively affected the consumption of the ration and fly larva and weight gain, however the feed:gain values were not different in the three treatments. The development of the bullfrog is directly related to the environmental temperature, which influences the consumption and utilization of food by the animals.

Uso de ratos de laboratório para determinar o valor nutritivo do milho em diversos níveis de carunchamento

RESUMO - Com o objetivo de avaliar os efeitos do milho carunchado e a qualidade de sua proteina para ratos em crescimento foi conduzido um experimento no bioterio do Departamento de Nutricao/UFV. Trinta ratos (femeas) recem-desmamados, da linhagem Wistar, com 22 dias de idade e peso medio de 53,9 ± 3,2 g foram distribuidos em delineamento inteiramente casualizado para cinco tratamentos e seis repeticoes com um animal por unidade experimental. Os tratamentos consistiram de uma dieta basal (controle positivo), como um padrao de caseina, quatro dietas com milho que continha 2%; 10%; 17% e 38% de carunchamento e uma dieta isenta de proteina. O ensaio teve duracao de 14 dias. Foram observados maior ganho de peso medio diario (GPMD), maior consumo de racao medio diario (CRMD), melhor conversao alimentar (CA) e maior razao proteica liquida (NPR) nos ratos que receberam a dieta padrao de caseina do que nas dietas que continham o milho carunchado, mas nao foi observado diferenca entre as dietas que continham diferentes niveis de carunchamento. Por outro lado, foi observado maiores coeficientes de digestibilidade de MS, PB e EDque na dieta padrao de caseina do que nas dietas contendo milho carunchado, embora maiores coeficientes tenham sido observados com 17% e que os valores semelhantes entre 2 e 38% provavelmente estejam relacionados ao processo de carunchamento. Com base nos dados do experimento, pode-se concluir que o aumento do nivel de carunchamento do milho nao afetou o desempenho dos animais e que a razao proteica liquida (NPR) do milho foi, em media, 57,8% do valor da dieta padrao de caseina. As variacoes observadas nos coeficientes de digestibilidade do milho podem ser atribuidos ao processo de carunchamento.

Farelos da vagem da algaroba e da folha da mandioca em rações para tilápia do Nilo em crescimento

This work evaluated the inclusion of mesquite bean bran ( Prosopis juliflora ) and cassava leaf bran ( Manihot esculenta ) in diets for Nile tilapia (85.22 ± 3.13 g). Three hundred and thirty-six fish were distributed in 28 fiberglass tanks (120 L) in a 2 × 4 factorial scheme for two sources of oil and four levels of bran (0, 5, 10 and 20%) (n = 4). After 60 days, growth performance (feed intake, weight gain, apparent feed conversion and survival rate) and fish body composition were evaluated. Heights and density of villi were measured for morphometric analysis of the intestinal mucosa. Animal performance, body composition and villi density were not affected (p > 0.05) by the source and level of inclusion of bran. There was a significant effect of the level of inclusion of bran on villi height, with a linear trend, indicating that the higher the inclusion levels of bran, the lower the height of the villi. The bran studied can be used in diets for Nile tilapia up to 20% without compromising growth performance and body composition change, but the presence of these by-products can result in a deleterious effect on fish villi.

Mesquite bean and cassava leaf in diets for Nile tilapia in growth - doi: 10.4025/actascianimsci.v34i3.13175

This work evaluated the inclusion of mesquite bean bran ( Prosopis juliflora ) and cassava leaf bran ( Manihot esculenta ) in diets for Nile tilapia (85.22 ± 3.13 g). Three hundred and thirty-six fish were distributed in 28 fiberglass tanks (120 L) in a 2 × 4 factorial scheme for two sources of oil and four levels of bran (0, 5, 10 and 20%) (n = 4). After 60 days, growth performance (feed intake, weight gain, apparent feed conversion and survival rate) and fish body composition were evaluated. Heights and density of villi were measured for morphometric analysis of the intestinal mucosa. Animal performance, body composition and villi density were not affected (p > 0.05) by the source and level of inclusion of bran. There was a significant effect of the level of inclusion of bran on villi height, with a linear trend, indicating that the higher the inclusion levels of bran, the lower the height of the villi. The bran studied can be used in diets for Nile tilapia up to 20% without compromising growth performance and body composition change, but the presence of these by-products can result in a deleterious effect on fish villi.