Abstract
The aim of this study was to develop a procedure based on Gompertz function to determine the efficiency of utilization of amino acid. The procedure was applied to determine the efficiency of utilization of dietary lysine, methionine+cystine and threonine by growing pullets and based on the efficiencies were estimated the requirements for the growth phase of birds. The Gompertz function was fitted to the data of feed intake, body weight, feather-free body protein weight and feather protein weight of four strains of laying hens in the growth phase. The rates of consumption and daily protein deposition (PD) were calculated. The amino acid deposition was obtained by multiplying the PD by the amino acid concentration in feather protein and feather-free body protein. The results showed that the efficiency of utilization of amino acid decreased with maturity and, conversely, there was a proportional increase of the requirement per kg of weight gain. The procedure based on the Gompertz function to determine the efficiency of utilization of amino acid proved to be suitable to evaluate the efficiency of utilization of amino acid and can be a useful tool to diagnose the effectiveness of the nutritional management, aiding in decision-making on the nutritional management.
Highlights
Among the functions used to describe the growth, the Gompertz function (GOMPERTZ, 1825) is the most used for poultry
Animal Sciences the deposition and nutrient intake during the whole production period, giving dynamism to the inferences. This approach makes it possible to diagnose the daily efficiency of amino acid utilization and, decision-making on the nutritional management to be adopted
The procedure was applied to determine the efficiency of utilization of dietary lysine (Lys), methionine+cystine (Met+Cys) and threonine (Thr) for growing pullets and based on the efficiencies were estimated the requirements for the growth phase of the birds
Summary
Among the functions used to describe the growth, the Gompertz function (GOMPERTZ, 1825) is the most used for poultry This preference is partially due to the biological significance of its parameters as well as the ease of statistical adjustment and robustness in describing the trajectory of growth in birds (RIVERATORRES et al, 2011). This equation has been applied on estimates of the efficiency of amino acid utilization. Animal Sciences the deposition and nutrient intake during the whole production period, giving dynamism to the inferences This approach makes it possible to diagnose the daily efficiency of amino acid utilization and, decision-making on the nutritional management to be adopted
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