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Effects of Varying Light Durations on Sperm Quality in Rams
Zhendong Zhu1, Wenjia Li1, Haolong Zhao1
1College of Animal Science and Technology, Qingdao Agricultural University, Qingdao 266109, China.
Animals : an Open Access Journal From MDPI
|January 8, 2025
Summary
Extending light exposure to 16 hours daily significantly improved ram sperm quality, including motility and concentration. This light manipulation also positively impacted hormone levels and antioxidant capacity, suggesting a beneficial effect on reproductive health.
Area of Science:
- Animal Science
- Reproductive Biology
- Metabolomics
Background:
- Photoperiod significantly influences reproductive seasonality and function in many animal species.
- Understanding the impact of artificial light manipulation on ram reproductive parameters is crucial for optimizing breeding programs.
Purpose of the Study:
- To investigate the effects of different light exposure durations on ram sperm quality and related physiological parameters.
- To identify optimal light duration for enhancing ram reproductive efficiency.
Main Methods:
- Rams were exposed to varying light durations (12, 14, 16, 18, 20 hours) for three months.
- Semen was collected and analyzed for motility, morphology, concentration, and integrity (acrosome, membrane).
- Metabolomic profiling, hormone levels (testosterone, FSH, LH), and antioxidant capacity (CAT, GSH, MDA) were assessed.
Main Results:
- The 16-hour light group showed significant improvements in sperm motility, concentration, volume, total sperm number, and acrosome/membrane integrity compared to the control (12 hours).
- Sperm abnormality decreased, while seminal plasma amino acid and testosterone levels, along with serum FSH and LH, increased significantly in the 16-hour group.
- Optimal antioxidant capacity (highest CAT, increased GSH, lowest MDA) was observed at 16 hours of light exposure.
Conclusions:
- Artificial extension of light duration to 16 hours daily positively impacts ram sperm quality and reproductive hormone profiles.
- This photoperiod management strategy holds potential for enhancing ram fertility and productivity.
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