Testosterone levels in studs

We recently had a Testerone test done on our 20 year old stud. He successfully covered all our mares in 2000 and has covered at least two mares this year. But later in the spring he seemed not to be interested in...We recently had a Testerone test done on our 20 year old stud. He successfully covered all our mares in 2000 and has covered at least two mares this year. But later in the spring he seemed not to be interested in...

Story originally posted by: Michael Lowder, DVM, MS Univ. of GA School of Veterinary Medicine

Dr. Lowder:

We recently had a Testerone test done on our 20 year old stud. He successfully covered all our mares in 2000 and has covered at least two mares this year. But later in the spring he seemed not to be interested in mounting the mares who were in heat. When we pulled the blood, we received a report showing a testerone baseline of 604 pg/ml and Red range of 200pg/ml. We were advised that this level is below normal slightly. We do not understand what all this means. Could you provide information on this? We also were told that he had possiblely just gotten over an infection of some type. He also had lost weight from his weight last year which was around 1150 lbs. We started supplementing him with soybean oil and he is on a diet of pasture and whole oats, sweet feed and calf manna mixed together. He has picked up some weight but still not at the desired weight of 1150 lobs. He stands 15-2 hands. We just started him on a compounded testerone injection of 1 cc twice a week.

Also we have a 20 year old brood mare that has trouble keeping weight on her and she basically is on the same diet as the stud but she has somewhat of a deformed upper bite. We have floated her teeth but the vet said it will take years to get her somewhat normal. She eats well but has no muscle tone in her chest and hips. She is a lactating mare, is there anything we can give her to build her up and not harm the foal or fetus?

Thank you,
Charlotte

Charlotte,

I would not worry about the testerone concentrations until I have a breeding soundness exam performed. His sperm needs to be examine for motility and concentration. The mare needs to have the foal wean and then you can address her weight problem. Feed on weight not volume. The mare should be getting 3% of her weight in dry matter a day (hay and grain).

Thanks, Dr. Lowder

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