Mathematical Model to Compare Egg Production C

Abstract

A segmented polynomial model was used on several egg production curves in an attempt to analyze the differences between the curves in a more descriptive manner. Production curves from different commercial and experimental genetic lines of layers were used. The parameters of the model include the age and level of peak production, rate of decrease in production after the peak and time between start and peak of production. These and other derived variables were compared between the curves using contrasts. The methodology used allowed an easier interpretation of the curves, and the detection of differences in sexual maturity, uniformity and peak of production. This work validates the segmented polynomial model for use in future research dealing with analysis of egg production curves.

Phenotypic study of egg production curve in commercial broiler breeders using Compartmental function

“…The use of mathematical models in animal production allowed researchers to describe and understand the biological processes and to evaluate the response variable effects. The purpose of modeling the egg production curve in poultry is to achieve a more detailed analysis of egg production cycle and to describe the curve phases and duration (Fialho and Ledur, 1997;Fialho et al, 2001).…”

Reduction ofSalmonellaEnteritidis in the Spleens of Hens by Bacterins That Vary in Fimbrial Protein SefD

“…Egg production was recorded from 14 days before the first immunization through 21 days after challenge. Mean daily egg production per treatment group per surviving hen was calculated for each group as described (Fialho et al ., 2001 ). The length of time between vaccine doses varied between trials because flock egg production was allowed to rebound before potentially stressing hens with a second vaccination.…”