Digestibilidade de ingredientes em dietas para juvenis de pacamã (Lophiosilurus alexandri)

Abstract

Resumo -O objetivo deste trabalho foi determinar o coeficiente de digestibilidade aparente (CDA) de seis ingredientes, em dietas-referência prática e purificada, e determinar a influência das dietas-referência sobre a digestibilidade dos ingredientes em juvenis de pacamã. Avaliaram-se os seguintes ingredientes: farinha de peixe, farinha de carne e ossos, farelo de soja, soja integral tostada, farelo de trigo e protenose de milho. Houve interação entre a dieta-referência e os ingredientes estudados. A dieta purificada proporcionou maior CDA quanto à proteína bruta e energia bruta. O pacamã apresentou CDAs elevados quanto aos ingredientes proteicos de origem vegetal, nas duas dietas-referência.Termos para indexação: coeficiente de digestibilidade, dieta prática, dieta purificada. Digestibility of ingredients in diets for pacman catfish juveniles (Lophiosilurus alexandri)Abstract -The objective of this work was to determine the apparent digestibility coefficient (ADC) of six ingredients, in practical and purified reference diets, and to assess the influence of these reference diets on the digestibility of the ingredients in pacman catfish juveniles. The following ingredients were evaluated: fish meal, meat and bone meal, soybean meal, roasted whole soybean, wheat meal, and corn protenose. There was interaction between the reference diet and the studied ingredients. The purified diet provided higher ADC for crude protein and gross energy. Pacman catfish showed high ADC for protein ingredients of vegetable origin for the two reference diets.

Starchy plant ingredients in pirarucu (Arapaima gigas) feeds: Utilization potential based on apparent digestibility and starch microstructure

“…Studies have reported the occurrence of nutrient leaching in digestibility assays due to long intervals between faecal collections (Abimorad & Abimorad & Carneiro, 2004; Kitagima & Fracalossi, 2010). In the present study, faeces were collected immediately after defecation, whereas in the study by Teixeira et al (2010), faeces were collected after 1 h. In the study by Melo et al (2016), this interval was not reported. We suggest that the short time between faecal collections in this study prevented faecal nutrient leaching, improving the reliability of our results.…”

“…The ADC of wheat bran crude protein for pirarucu was lower than that for the freshwater carnivore pacamã ( Lophiosilurus alexandri , 83.50%) (Melo et al, 2016). The ACDs for corn, broken rice and sorghum were also lower than that for surubim (87.40%, 85.30% and 81.11% respectively) (Teixeira et al, 2010).…”

Oregano essential oil ( Origanum vulgare ) dietary supplementation improved growth performance, body protein retention and muscle hyperplasia of the Neotropical catfish Lophiosilurus alexandri

“…Although we have not evaluated digestibility, we believe that the increase in these biochemical variables may be related to the beneficial effect of OEO on the digestion of nutrients, including lipids and carbohydrates, the latter with reduced digestibility in carnivorous fish such as L . alexandri (Melo et al, 2016). In addition, the increase in cholesterol levels probably did not lead to a greater deposition of lipids, since there were no changes in carcass lipid content and viscerosomatic, hepatosomatic and visceral fat indices.…”

The effects of salinity on growth, gill tissue and muscle cellularity in Lophiosilurus alexandri juvenile, a Neotropical freshwater catfish

“…A series of studies has been conducted with the aim of expanding knowledge regarding reproduction, physiology and growth of the species (Costa et al, 2015; Silva et al, 2019; Takata et al, 2018). Moreover, the species has potential for aquaculture because of the quality of its flesh (Sant'ana et al, 2014) and its ability to be conditioned to accept formulated diets via different methods of feed‐conditioning (Cordeiro et al, 2016; Luz et al, 2011), which has facilitated studies of nutrition and large scale production for the species (Melo et al, 2016; Santos et al, 2012). However, there is no information about the effects of salinity on muscle development and gill tissue for L. alexandri juvenile.…”