Phytase top-coated onto extruded all-vegetable diets reduces the need for dicalcium phosphate and decreases phosphorus loss in fast-growing juvenile Nile tilapia

IF 2.5 2区农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Animal Feed Science and Technology Pub Date : 2025-02-27 DOI:10.1016/j.anifeedsci.2025.116280

Tânia Cristina Pontes , Johnny Martins de Brito , Thais Pereira da Cruz , Bruno Wernick , Valéria Rossetto Barriviera Furuya , Wilson Massamitu Furuya

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引用次数: 0

Abstract

This study evaluated the effects of reducing dietary dicalcium phosphate (DP) levels by supplementing liquid-form phytase (PHY) at 1000 PHY units (FTU)/kg diet on growth performance, vertebral mineralization, plasma parameters, and phosphorus (P) loss of juvenile Nile tilapia, Oreochromis niloticus. Fish (n = 240; 12.1 ± 0.4 g) were distributed into 20–70 L each aquarium in a completely randomized design with 5 treatments and 4 replicates of 12 fish each. Dietary treatments comprised a nutritionally adequate positive control diet containing 300.5 g/kg crude protein, 18.9 MJ/kg digestible energy and 8.6 g/kg available P (PC); a P-deficient negative control diet without DP or PHY (NC); and three additional diets based on the NC diet: one without DP (NC1) plus PHY, one with 10 g/kg DP (NC2) plus PHY, and one with 20 g/kg DP (NC3) plus PHY. Fish were hand-fed 6 times daily until apparent satiety for 8 weeks. Fish fed PC and NC2 diets displayed similar body weight gain (BWG), feed conversion ratio (FCR), whole-body ash, calcium (Ca) and P, vertebrae Ca, P and manganese (Mn), and plasmatic P levels, which were higher than those fed NC diet. Feed efficiency ratio (FER), vertebrae zinc (Zn), plasmatic Ca, and cholesterol responses were not affected by dietary treatments. Compared to PC diet, fish fed NC2 diet showed markedly reduced lower P loss by −0.4 g/kg of BWG. This study identified PHY enabling a 20 g/kg reduction in dietary DP without negatively impacting the growth performance and health of juvenile Nile tilapia.

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来源期刊

Animal Feed Science and Technology 农林科学-奶制品与动物科学

CiteScore

6.00

自引率

6.20%

发文量

266

审稿时长

3 months

期刊介绍： Animal Feed Science and Technology is a unique journal publishing scientific papers of international interest focusing on animal feeds and their feeding. Papers describing research on feed for ruminants and non-ruminants, including poultry, horses, companion animals and aquatic animals, are welcome. The journal covers the following areas: Nutritive value of feeds (e.g., assessment, improvement) Methods of conserving and processing feeds that affect their nutritional value Agronomic and climatic factors influencing the nutritive value of feeds Utilization of feeds and the improvement of such Metabolic, production, reproduction and health responses, as well as potential environmental impacts, of diet inputs and feed technologies (e.g., feeds, feed additives, feed components, mycotoxins) Mathematical models relating directly to animal-feed interactions Analytical and experimental methods for feed evaluation Environmental impacts of feed technologies in animal production.