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Top: Cumulative percentage (%) female goats showing a progesterone concentration of ⩾1 ng/ml or bottom: female goats showing oestrous of 7-month old after exposure to bucks exposed to natural changes in day length over the whole experiment (CONTROL bucks (◻), and to bucks submitted to a period of 3 months of long days, and then to the natural photoperiod (PHOTO bucks, 
); and 10-month-old female goats after exposure to CONTROL bucks (
), and to PHOTO bucks (■).
