What it is:
T4 is a blood test that checks how well the thyroid gland is working. The thyroid helps control metabolism, energy levels, and hormone balance.
Why it is beneficial to breeders:
Helps explain changes in energy, weight, or coat quality
Supports reproductive health and cycle regularity
Identifies thyroid issues that may affect breeding performance
Provides reassurance when a breeding animal is not acting like themselves
 
To summarize:
 T4: A blood test that checks thyroid function, which plays a role in energy levels, weight, coat quality, and reproductive health.