Studies on infectious bursal disease maternal immunity decay curve in native and lohmann chicken breeds

الملخص EN

This study was done to evaluate and study the decaying curve of IBD MDA bs of the native chicken breeds including (Fayoumi, Dandrawi, Sinewy and Baladi) were taken in consideration as compared with (Lehmann white) layer type breed.

The results showed that the decline of maternal immunity of IBDV in Lehmann is the faster followed by Senawi, Baladi, Fayoumi and Dandrawi and the 1 day IBD ELISA titers were shown to be nearly equal in Senawi (5449, 371) and Lehmann (4536, 437) and titer of Baladi chicks was close to the for mentioned two breeds (5327،ہ371), the Dandrawi (4649،ہ331) and Fayoumi (4596،ہ857) are lower but close to each other.

The standard deviation (SD) values recorded in Fayoumi breed showed great variation in the recorded titers, while of the other 4 groups seemed to be homogenous.

Comparing the 22 day decline manner in titer it was clear that the loss in titer in Fayoumi (3494) and Lohmann (3413) was nearly equal and followed by Dandrawi (3093) and Baladi (2972) those showing lower titers.

The recorded unprotected titer-400was detected at 43 days in Lohmann, Baladi and Senawi, 37 days in Dandrawi and 31 in Fayoumi.

Percentage of decline from its original values showed that Fayoumi last (75.95 %) at 22 days followed by (66.53 %) in Dandrawi followed by (62.78 %) Lohmann, (55.79) Baladi and (55.19) Senawi.

Different breeds showed different slope values that indicate differences in the decay of maternal antibodies.

The predication of antibody titer for each breed as the slope in decline curve in Lehmann chicks showed highest values followed by Dandrawi chicks while the Fayoumi and Baladi were as the same values and on the other hand the Sinewy showed the lowest value.