Autonomic efferents affect intake of imbalanced amino acid diets by rats

Bellinger, Larry L.; Williams, Fred E.; Lucente, James; Pavelka, Jason; Dixon, Kimberly D.; Gietzen, Dorothy W.

doi:10.1016/j.pbb.2005.02.001

Cited by 7 publications

(1 citation statement)

References 39 publications

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“…This hypothesis may be contrasting to what has been reported for mammals (Bellinger et al 2005;Gietzen and Aja 2012;Hao et al 2005) and to what was reported for rainbow trout juveniles (Oncorhynchus mykiss) that showed a reduced feed intake when fed Lys devoid diets (Yamamoto et al 2001). Furthermore, no mechanism is known to explain an increased feed intake as to compensate for inferior quality of the dietary IAA composition in fish.…”

Section: Discussioncontrasting

confidence: 68%

Dietary indispensable amino acids profile affects protein utilization and growth of Senegalese sole larvae

Canada

Engrola

Richard

et al. 2016

Fish Physiol Biochem

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In diet formulation for fish, it is critical to assure that all the indispensable amino acids (IAA) are available in the right quantities and ratios. This will allow minimizing dietary AA imbalances that will result in unavoidable AA losses for energy dissipation rather than for protein synthesis and growth. The supplementation with crystalline amino acids (CAA) is a possible solution to correct the dietary amino acid (AA) profile that has shown positive results for larvae of some fish species. This study tested the effect of supplementing a practical microdiet with encapsulated CAA as to balance the dietary IAA profile and to improve the capacity of Senegalese sole larvae to utilize AA and maximize growth potential. Larvae were reared at 19 °C under a co-feeding regime from mouth opening. Two microdiets were formulated and processed as to have as much as possible the same ingredients and proximate composition. The control diet (CTRL) formulation was based on commonly used protein sources. A balanced diet (BAL) was formulated as to meet the ideal IAA profile defined for Senegalese sole: the dietary AA profile was corrected by replacing 4 % of encapsulated protein hydrolysate by CAA. The in vivo method of controlled tube-feeding was used to assess the effect on the larvae capacity to utilize protein, during key developmental stages. Growth was monitored until 51 DAH. The supplementation of microdiets with CAA in order to balance the dietary AA had a positive short-term effect on the Senegalese sole larvae capacity to retain protein. However, that did not translate into increased growth. On the contrary, larvae fed a more imbalanced (CTRL group) diet attained a better performance. Further studies are needed to ascertain whether this was due to an effect on the voluntary feed intake as a compensatory response to the dietary IAA imbalance in the CTRL diet or due to the higher content of tryptophan in the BAL diet.

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