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Mean concentration of plasma prolactin of ewes exposed to short day photoperiod (SDPP; 8 h of light: 16 h of dark) or long day prepartum photoperiod (LDPP; 16 h of light: 8 h of dark). The table presents the number of ewes per treatment (n) on each week relative to lambing. Error bars indicate SEM. *Least squares means within a test day are different (P < 0.05). **Least squares means within a test day are different (P < 0.01).
