The aim of this study was to evaluate the nutritional composition and in vitro digestibility in rabbits of a pelleted feed using citrus pulp as a substitute for a conventional feed. It was used 24 adult rabbits (>80 days) distributed in four treatments (0, 10, 20 and 30%) with six repetitions. The experimental period was 12 days (7 for the adaptation period and 5 for the faeces collection). The orange pulp presented 7.4% crude protein (CP), 14.9% crude fibre (CF), 3.8% ether extract, 5.1% mineral matter, 4308 kcal/kg of gross energy and 385.76 mg polyphenols per 100 g of citrus pulp. CP levels decreased as the inclusion level of citrus pulp increased (16.77 to 17.85%), while the dry matter digestibility percentage increased with higher pulp inclusion levels. It is concluded that up to 30% of citrus pulp can be included in rabbit feed as a substitute for commercial concentrate without ...

The Capitan de la sabana fish (Eremophilus mutisii) is an endemic species of the Colombian Cundiboyacense plateau with high potential for aquaculture, although it is currently in a vulnerable state. The study aimed to describe the development of the digestive system during the early stages of life to optimize captive breeding strategies and contributing to its conservation. Larvae were obtained by artificial insemination and evaluated at three developmental stages: early (EF), middle (MF), and final (FF). Specimens were euthanized with an overdose of tricaine methanesulfonate, fixed in 4% formalin, and histological slides were stained with haematoxylin-eosin (H&E). During EF (6-78 hours post-hatching, HPH), mouth opening was observed at 72 HPH, with 44.2% yolk sac (YS) absorption, along with a linear digestive system and intestinal folds. At MF (96-144 HPE), YS absorption reached 68....