Digestible energy and protein requirements for maintenance and growth of pacu ( Piaractus mesopotamicus ): A factorial approach-based model

The protein and energy requirements of pre-weanling dairy calves were studied through the use of growth and balance trial techniques. Various levels of protein and energy were fed in both purified and semi-purified diets. The nitrogen retention of calves fed diets adequate in protein was 3.22 gm. per 100 gm. of gain in body weight. Energy requirement for maintenance was 44.7 digestible Calories per kg. of body weight per day and 268 digestible Calories were required per 100 gm. of gain in weight. These factors, along with previously determined values for endogenous nitrogen, were used to calculate the practical digestible energy and apparent digestible protein requirements of dairy calves.

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Digestible protein requirements for maintenance, growth, and efficiency of protein utilization in pacu (Piaractus mesopotamicus) juveniles: an exponential nitrogen utilization model

Latin American Journal of Aquatic Research ◽

10.3856/vol49-issue4-fulltext-2678 ◽

2021 ◽

Vol 49 (4) ◽

pp. 608-619

Author(s):

Cleber F.M. Mansano ◽

Edney P. Da Silva ◽

Kifayat U. Khan ◽

Beatrice I. Macente ◽

Thiago M.T. Nascimento ◽

...

Keyword(s):

Nitrogen Retention ◽

Model Parameters ◽

Protein Utilization ◽

Piaractus Mesopotamicus ◽

Protein Requirements ◽

Protein Levels ◽

Randomized Design ◽

Acclimation Period ◽

Digestible Protein ◽

The Relationship

The present study aimed to estimate digestible protein (DP) requirements for maintenance and growth and assess the efficiency of protein utilization in pacu (Piaractus mesopotamicus) juveniles. A complete randomized design consisted of seven treatments, and five replicates (tanks) per treatment was used. After a one-week acclimation period, 350 pacu juveniles of 27.48 ± 1.8 g (initial average body weight - BW) were equally distributed among 35 tanks (10 fish per tank) of 450 L. Fish were fed with seven graded digestible protein levels (64.5, 111.8, 164.6, 217.1, 264.4, 316.2 and 369.5 g kg-1) three times a day until apparent satiation for 120 days. The monomolecular model parameters including nitrogen maintenance requirement (NMR) (37.76 mg BW0.67 kg-1 d-1), daily nitrogen deposition (ND) (194.8 mg BW0.67 kg-1 d-1), and protein intakes (based on metabolic BW) of 1638, 1902, and 2241 mg kg-1BW0.67 d-1 for 75, 80 and 85% maximum theoretical nitrogen retention (NRmaxT), respectively and the efficiency of protein utilization (529×10-6) were estimated through the relationship between nitrogen intake (NI) and ND. The digestible protein requirements for 75, 80, and 85% of NRmaxT were estimated as 187, 217, and 256 g kg-1 respectively by the monomolecular model based on the daily feed intake of 2% of live BW of pacu juveniles.

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A factorial approach to defining the energy and protein requirements of Tra Catfish, Pangasianodon hypothalamus

Aquaculture Nutrition ◽

10.1111/j.1365-2095.2010.00774.x ◽

2011 ◽

Vol 17 (2) ◽

pp. e396-e405 ◽

Cited By ~ 19

Author(s):

B. GLENCROSS ◽

T.T.T. HIEN ◽

N.T. PHUONG ◽

T.L. CAM TU

Keyword(s):

Protein Requirements ◽

Factorial Approach ◽

Tra Catfish

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Evaluation of amino acid and protein requirements in chronic uremia

Archives of Internal Medicine ◽

10.1001/archinte.126.5.855 ◽

1970 ◽

Vol 126 (5) ◽

pp. 855-859 ◽

Cited By ~ 15

Author(s):

P. F. Gulyassy

Keyword(s):

Amino Acid ◽

Protein Requirements ◽

Chronic Uremia

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EURRECAs Approach for Estimating Micronutrient Requirements

International Journal for Vitamin and Nutrition Research ◽

10.1024/0300-9831/a000071 ◽

2011 ◽

Vol 81 (4) ◽

pp. 256-263 ◽

Cited By ~ 22

Author(s):

Christophe Matthys ◽

Pieter van ‘t Veer ◽

Lisette de Groot ◽

Lee Hooper ◽

Adriënne E.J.M. Cavelaars ◽

...

Keyword(s):

Reference Values ◽

Policy Decision ◽

Individual Variability ◽

The Body ◽

Decision Makers ◽

Nutrient Requirements ◽

Factorial Approach ◽

Dietary Reference Values ◽

Health Policy Decision ◽

Quantitative Integration

In Europe, micronutrient dietary reference values have been established by (inter)national committees of experts and are used by public health policy decision-makers to monitor and assess the adequacy of diets within population groups. The approaches used to derive dietary reference values (including average requirements) vary considerably across countries, and so far no evidence-based reason has been identified for this variation. Nutrient requirements are traditionally based on the minimum amount of a nutrient needed by an individual to avoid deficiency, and is defined by the bodys physiological needs. Alternatively the requirement can be defined as the intake at which health is optimal, including the prevention of chronic diet-related diseases. Both approaches are confronted with many challenges (e. g., bioavailability, inter and intra-individual variability). EURRECA has derived a transparent approach for the quantitative integration of evidence on Intake-Status-Health associations and/or Factorial approach (including bioavailability) estimates. To facilitate the derivation of dietary reference values, EURopean micronutrient RECommendations Aligned (EURRECA) is developing a process flow chart to guide nutrient requirement-setting bodies through the process of setting dietary reference values, which aims to facilitate the scientific alignment of deriving these values.

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