Comparison of growth curve models on average and individual body weights in chickens
Küçük Resim Yok
Tarih
2007
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Eugen Ulmer Gmbh Co
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Growth curves for average body weights of broilers were compared with growth curves for individuals using three models: Bertalanffy, Gompertz, and Logistic. A total of 141 males and females from two commercial lines were studied: 24 females and 32 males from line 1, and 64 females and 21 males from Line 2. individual body weights were recorded weekly, from hatching through 6 weeks of age. Coefficients of determination, residual standard errors and Durbin-Watson statistics were used to determine goodness of fit. Log-Logistic gave the best fit of the three growth models. When fitting the Log-Logistic, the residual standard error, Durbin Watson statistics and estimates of the parameter for mature weight were generally higher for curves of individual weights than for curves of average weights. Estimates for age at the inflection point were the same for average of individual weights and average weights. Average growth curves can be useful to demonstrate the growth model and to make general interpretations, but individual growth curves are necessary to examine individual differences.
Açıklama
Anahtar Kelimeler
broiler, Bertalanffy, Gompertz, logistic, growth curve
Kaynak
Archiv Fur Geflugelkunde
WoS Q Değeri
Q4
Scopus Q Değeri
N/A
Cilt
71
Sayı
1
