Development of a suitable model for ascertaining the growth and egg production in quails
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Date
1991
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Department of Agricultural Statistics, College of Horticulture, Vellanikkara
Abstract
An investigation was carried out into the growth and egg production aspect of Japanese quails at the Kerala Agricultural University Poultry Farm, Mannuthy on 1st February, 1989 with the following objectives.
1. t.o find a suitable relationship between age and body weight.
2. to investigate the trend of egg production i n quails through suitable mathematical models.
3. to study the impact of climate parameters (temperature, humidity) on egg production in quails The birds were reared under uniform feed formula and I identical management practices (recommended by Kerala Agricultural University Package ;of Practices). The investigation mainly depended on data consisting of weekly body weights of individual birds, daily egg production of birds (beginning from age at sexual maturity) and daily climatological parameters (temperature and humidity) from beginning till the end of experiment of 30th September, 1989. Mathematical models such as linear, quadratic, exponential, Von-Bertalanffy, modified exponential, logistic and Gompertz were fitted for the purpose using body weights of individual birds as well as average body weights over twelve weeks and the fitted models were compared using coefficient of determination (r^) and standard error of estimate(s). Mathematical models such as linear, exponential, parabolic exponential, inverse polynomial, Gamma function, Gamma-type functicn, quadratic function, quadratic function in logarithmic scale, quadratic-cum-log, emperical and linear hyperbolic functions were fitted for the development of suitable models for ascertaining egg production using total weekly, fortnightly egg production, hen housed and hen day egg production and fitted models were compared using Furnival . 2 index, r and s.
Multiple linear regression equation was fitted using average weekly egg production per bird as dependent variable and weekly temperature and humidity as explanatory variable to study the impact of diimatological parameters on egg production in quails.
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