Analisis parameter pertumbuhan itik Magelang generasi ketiga di Balai Pembibitan Ternak Non Ruminansia Satuan Kerja itik Banyubiru
Abstract: The aim of this
research was to determine growth curve models of the third generation Magelang
ducks using Gompertz and Logistic Growth Model. Individual body weight was
obtained by weighing at every three days from 0 to 60 days.Growth parameters
were analyzed by non linear Gompertz and Logistic models using SAS v6.12
program. The results showed that the growth curve models had different levels
of accuracy, regression models equation of Gompertz at male wasY=2031.047 exp(-3.475 exp-0.03),
female was Y=1711.909 exp(-3.374 exp-0.04), whereas regression models equation
of Logistic at male wasY=1525.168/(1+14.996 exp-0.07), and female was
Y=1387.704/(1+13.893 exp-0.08).Growth rate constant (k) of Gompertz model was
lower than Logistic model, whereas Gompertz’s asymptotic mature weight (A) was
higher than Logistic model. Gompertz shows smaller number of R2 dan AIC it
was0.9997 and110.227, whilst Logistic 0.9987 and143.917.Inflection point for
Gompertz model at male, female and unsexducks wereindicated by age (Yi) and
weight (ti) at inflection point, there were : Yi = 932.408 g, ti = 35.798 day;
Yi = 785.899g, ti = 30.586 day; and Yi= 856.572 g, ti = 33.177 day,
respectivelywhilst Logistic was Yi = 762.584g, ti = 36.470 day; Yi = 689.352 g,
ti = 33.209 day; and Yi= 726.014 g, ti = 34.890 day, respectively. In
conclusing, inflection point and calibration of R2and AIC, conluded that
Gompertz models was greater to represent growth patterns of third generation
Magelang ducksrather than Logistic models.
Keywords: Magelang duck,
growth models, R2, AIC, inflection point
Penulis: Elisabeth Nadia
Yusinta, Edy Kurnianto, Sutopo
Kode Jurnal: jppeternakandd170081
