Comparative analysis for production traits of local chicken and Isa brown in KGR-Iraq

الملخص EN

The research work has been constructed at Sulaimani Research Station–Director of Agricultural Research to study the effect of three lines of local chickens: Pure black (line 1), Black with brown Neck (line 2), White (line 3) and Isa Brown (line 4) at four periods (19-32, 33-43, 44-60 and 61-75 weeks) on egg production traits.

The age at first day of egg production, first week of production, sexual maturity, when reach to 50% and peak egg production and long duration of peak egg production were recorded.

In addition to estimate the egg/hen/all periods, egg/hen/week, egg / hen / all period % and hen day egg production %.

No significant difference between lines on age at first day of egg production, first week of production, sexual maturity and reach to peak production.

Line 2 significantly (p < 0.05) reach to 50% before other lines about 8-21 weeks.

Moreover, line 3 significantly (p<0.05) has the shorter duration of egg production compared with other lines.

Hen day egg production% at age at sexual maturity, at 50% production and throughout long duration of production did not significantly differed between lines.

Peak production % of line 2 was significantly (p < 0.05) higher than other lines.

Egg weight was significantly (p<0.05) higher in line 4 compared with lines 1,2 and 3, but did not significantly differed with line 3 in egg/ hen/ all periods and egg/ hen/ week.

As for percentage of egg production, line 2 was significantly (p < 0.05) higher in percentages (33.20 and 34.30%) for egg/ hen/ periods % and Hen Day Production %, respectively.

As the age increased the egg weight was increased, while egg/ hen/ period, egg/ hen/ week and percentage of egg production were significantly (p < 0.05) higher at period 3.