ORIGINAL PAPER
Application of the law of diminishing returns to describing the relationship between metabolizable energy intake and growth rate in broilers
H. Darmani Kuhi 1,   E. Kebreab 1,   E. Owen 1,   J. France 1
 
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The University of Reading, Department of Agriculture, Earley Gate, Reading RG6 6AR, UK
Publication date: 2001-11-06
 
J. Anim. Feed Sci. 2001;10(4):661–670
 
KEYWORDS
ABSTRACT
A monomolecular equation was constructed and seven published data sets were used to evaluate it with regard to its ability to describe the relationship between metabolizable energy intake and growth rate in broilers. The monomolecular takes the form: G = Gmax (1 - e-K(I-Im)) where G is liveweight gain (g/g of LW/d), I is metabolizable energy intake (kJ/g of LW/d), and Gmax, K and Im are growth parameters. This equation was used with non-linear regression to estimate the parameters and combine them to determine other biological indicators. The estimates of metabolizable energy requirement for maintenance varied between 457-655 (kJ/kg of LW/d), depending on the data set. Predictions of average metabolizable energy requirement to produce 1 g of liveweight gain varied from 9 to 13 kJ (2.2-3.08 kcal). These results show good agreement with previous studies. The present study demonstrates that the monomolecular equation is suitable for using as a simple input-output device relating metabolizable energy intake to growth rate in broilers.
 
CITATIONS (6):
1.
Application of the law of diminishing returns to estimate maintenance requirement for amino acids and their efficiency of utilization for accretion in young chicks
H. DARMANI KUHI, E. KEBREAB, S. LOPEZ, J. FRANCE
The Journal of Agricultural Science
 
2.
A review of mathematical functions for the analysis of growth in poultry
H. DARMANI KUHI, T. PORTER, S. LÓPEZ, E. KEBREAB, A.B. STRATHE, A. DUMAS, J. DIJKSTRA, J. FRANCE
World's Poultry Science Journal
 
3.
Application of the law of diminishing returns for partitioning metabolizable energy and crude protein intake between maintenance and growth in growing male and female broiler breeder pullets
H. DARMANI KUHI, F. REZAEE, A. FARIDI, J. FRANCE, M. MOTTAGHITALAB, E. KEBREAB
The Journal of Agricultural Science
 
4.
Mathematical modelling in animal nutrition: a centenary review
A. DUMAS, J. DIJKSTRA, J. FRANCE
The Journal of Agricultural Science
 
5.
A comparative evaluation of functions for partitioning nitrogen and amino acid intake between maintenance and growth in broilers
E. KEBREAB, J. FRANCE, H. KUHI, S. LOPEZ
The Journal of Agricultural Science
 
6.
Response of Nile tilapia (Oreochromis niloticus) to lysine: Performance, body composition, maintenance and efficiency of utilization
Souza de, Nascimento do, Robert Gous, Matheus Reis, Cleber Mansano, Kifayat Khan, Nilva Sakomura, João Fernandes
Aquaculture
 
ISSN:1230-1388