Influences of season and artificial photoperiod on stallions: testicular size, seminal characteristics and sexual behavior.

@article{Clay1987InfluencesOS,
  title={Influences of season and artificial photoperiod on stallions: testicular size, seminal characteristics and sexual behavior.},
  author={Colin M. Clay and Edward L. Squires and Rupert P. Amann and B. W. Pickett},
  journal={Journal of animal science},
  year={1987},
  volume={64 2},
  pages={517-25}
}
To investigate the influence of daylength on the seasonal reproductive cycle of stallions, 21 stallions were assigned to one of three treatments: control, ambient (natural) photoperiod; S-L, 8 h light and 16 h dark (8:16) for 20 wk beginning July 16, 1982 then 16:8 from December 2, 1982 until March 5, 1984; S-S, 8:16 from July 16, 1982 until March 1984. Temperature was not controlled and was similar for all groups. Total scrotal width (TSW) was measured every 4 wk throughout the experiment… CONTINUE READING

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