Effect of immunization against OPN5 on the reproductive performance in Shan Partridge ducks under different photoperiods.

In contrast, the group OPN5 demonstrated a highly significant increase in the anti-OPN5 antibody titer after 15 d of the initial immunization ( P < 0.05), which subsequently remained high throughout the trial period and was significantly higher than the group CL and group CS ( P < 0.05).

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