A simplified method to optimaize the keeping period in layer flock.

概要

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In deciding the keeping period in layers reared in the large scale farm, it is important to maximize the economic profits by doing the several rotations of layer flocks within a certain term, but not by one rotation of a layer flock at the age of weeks which show the most maximum profit only.This paper deals with the influences of egg production, price of egg and price of feed on the economic profits, which were closely connected with the age of weeks of the maximum average profit. Numbers of management records of layers used in this study were 120939 of Shaver obtained from a single farm in TOHOKU area during from 1982 to 1985.The cumulative egg productions by week were enough approximated with a cubic curve of a regression expression, and also the cumulative feeds were with a linear. In these conditions, raising cost, price of egg and egg production were greatly connected with the weeks of maximum average profit, but no influences of feed consumption or price of feed.For deciding the weeks for maximum average profit, a numerical expression was drawn by the method of multiple regression with three variables of egg production, price of egg and raising cost and was tested. As the results, it was proved that this expression was very effective in making dicision on the keeping period for poulty farmers.
日本家禽学会の論文