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Effects of Dietary Cobalt Levels on Growth Performance, Antioxidant Capacity, and Immune Status of Juvenile Largemouth Bass (). | LitMetric

Effects of Dietary Cobalt Levels on Growth Performance, Antioxidant Capacity, and Immune Status of Juvenile Largemouth Bass ().

Vet Sci

Key Laboratory of Integrated Rice-Fish Farming Ecology, Ministry of Agriculture and Rural Affairs, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China.

Published: November 2024

AI Article Synopsis

  • - A 9-week study examined how varying levels of dietary cobalt affected largemouth bass, with six groups receiving different amounts ranging from 0.129 mg/kg to 0.316 mg/kg.
  • - The control group with the lowest cobalt level showed poor growth and feed efficiency, while groups with cobalt supplementation had better weight gain and body composition, particularly with 0.192 mg/kg improving protein and reducing moisture content.
  • - Antioxidant markers, gene expression, and regression analysis identified optimal dietary cobalt levels for growth performance were around 0.24 to 0.26 mg/kg, highlighting the importance of cobalt in fish health and growth.

Article Abstract

A 9-week experiment investigated the effects of dietary cobalt levels on the growth performance, antioxidant capacity, and immunity of largemouth bass. Six feed groups were designed and each group received different cobalt levels, including 0.129 mg/kg (control group), 0.192 mg/kg, 0.201 mg/kg, 0.233 mg/kg, 0.277 mg/kg, and 0.316 mg/kg. The results show that the control group (0.129 mg/kg diet) had the lowest final body weight (FBW), weight gain rate (WGR), and specific growth rate (SGR), and the highest feed conversion ratio (FCR), when compared to the cobalt supplementation groups. Dietary cobalt levels of 0.192 mg/kg increased the body protein content and decreased the body moisture content. Regarding antioxidant capacity, the highest catalase (CAT) activity was found in the 0.277 mg/kg dietary cobalt group, while the malondialdehyde (MDA) content was significantly diminished; the total antioxidant capacity (T-AOC) content and glutathione peroxidase (GSH-Px) activity exhibited the highest values in the 0.192 mg/kg and 0.233 mg/kg dietary cobalt groups, respectively. Regarding gene expression, compared with the control group, the mRNA expression of was upregulated in the 0.192 mg/kg, 0.233 mg/kg, and 0.277 mg/kg dietary cobalt groups, while the mRNA expression of was diminished when dietary cobalt levels were below 0.233 mg/kg. In addition, the highest and mRNA expression levels were observed in the 0.201 mg/kg and 0.233 mg/kg dietary cobalt groups, respectively. According to the quadratic regression analysis based on the SGR and FCR, the optimal requirement was 0.24 and 0.26 mg/kg of dietary cobalt, respectively.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11598977PMC
http://dx.doi.org/10.3390/vetsci11110576DOI Listing

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