Received: 10-05-2021
Accepted: 09-12-2021
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Application of Nonlinear Functions to Describe the Growth of F1(Ho × Luong Phuong) Chickens
,
Dang Thuy Nhung
2
Keywords
Nonlinear models, growth models, F1(Ho Luong Phuong) chickens
Abstract
This study was carried out at animal farm of Vietnam National University of Agriculture from June 2019 to March 2021 in order to describe the growth and determine the best growth models to estimate body weight of F1(Ho Luong Phuong) chickens. A total of six functional growth models, Logistic, von Bertalanffy, Gompertz, Richards, Brody and Negative Exponential were used to estimate body weight from 1 to 15 weeks of age. Data on growth performance were collected from 210 chickens (105 cocks and 105 hens). The results showed that, Logistic and Gompertz functions best described the growth of HLP chickens with the highest coefficient of determination (96.55 and 96.79%) and the lowest MSE (32,371.80 and 18,625.90). The age and weight of start of growth acceleration phase were 2.7 weeks and 280g for cocks and 3.1 weeks and 264g for hens. The age and weight of inflection point were 7.82 weeks and 1,400.63g for cocks and 12.9 weeks and 970.65g for hens. The age and weight of end of growth deceleration phase were 12.9 weeks and 2,521g (cocks) and 17.6 weeks and 2,375g (hens). Polynomial functions were suitable to estimate the association between feed consumption and feed conversion ratio with the age of the birds.
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