Persistency and egg production curve in laying hens

الملخص EN

This study was performed at Faculty of Veterinary Medicine Suez Canal University in order to perform “Statistical Studies on Some Factors Affecting Layers Performance” the data were collected during the period between June 2008 and September 2011 from governmental and non-governmental (private) sources for three different breeds of layers (Lohmann, Bovans and Hisex).

The data were analyzed statistically using analysis of covariance using SAS (v8) after performing egg production persistency model.

Results showed that the area under the egg production curve which include different stage of production (stage of slow increase-stage of rapid increase-stage of constant production (persistency)-stage of decrease) didn’t differ significantly between both governmental and private sectors at (p ≤ 0.05).

But there is significant difference between different breeds within sector at (p ≤ 0.05) for stage of constant production under the curve of egg production but non-significant for other stages of production under the curve and for total egg production.

In conclusion, flock management which was applied during the chick raising period, caring and feeding conditions are considered to be effective in governmental than private sector and thus improve productive efficiency of layers.