Comparative analysis of the performance, egg quality and ovarian immune function of fast and slow feather strains in tianfu green shell laying hens at various stages of egg production.

Similarly, YC in the EF group surpassed that in the LF group during both the early and late laying periods; however, the difference was only highly significant during the early laying period ( P < 0.01), with no significant difference observed in the late laying period ( P >0.05).

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While ES in the EF group exceeded that in the LF group during both the early and late laying stages, these differences did not reach statistical significance ( P >0.05).

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