27 research outputs found
Seasonal changes in serum progesterone levels in Thoroughbred racehorses in training
The objective of the present study was to verify the seasonal luteal activity of racehorses in training in Japan from March to August. We allocated 102 horses into a luteal activity group and non-luteal activity group. The luteal activity group included horses with serum progesterone levels that were consistently >1 ng/ml and changed by ± 1 ng/ml. In contrast, the progesterone levels of the non-luteal activity group were consistently <1 ng/ml. In late spring (from May 1 to June 30) and summer (from July 1 to August 31), the percentage of horses in the luteal activity group was significantly higher than in early spring (from March 1 to April 30, P<0.01). These findings demonstrate clear seasonal variations in ovarian activity. The present study also suggest that training for a race may not affect ovarian activity in female racehorses.https://www.jstage.jst.go.jp/article/jes/26/4/26_1518/_article/-char/ja
Application of a wearable GPS unit for examining interindividual distances in a herd of Thoroughbred dams and their foals
Plasma activin A concentrations during late gestation in Thoroughbred mares with abnormal pregnancies
Factors affecting the prognosis for uterine torsion: the effect of treatment based on measurements of serum progesterone and estradiol concentrations after surgery
Assessment for Predicting Parturition in Mares Based on Prepartum Temperature Changes Using a Digital Rectal Thermometer and Microchip Transponder Thermometry Device
Anti-Müllerian hormone as an indicator of hemi-castrated unilateral cryptorchid horses
Anti-Müllerian hormone (AMH), a glycoprotein secreted from the fetal testis, is responsible for regression of the Müllerian duct in the male fetus. The aim of this study was to evaluate the usefulness of serum AMH as a biomarker for diagnosis of cryptorchidism in horses. Serum AMH concentrations were measured in intact stallions, hemi-castrated unilateral cryptorchid stallions, and geldings. In addition, expression of AMH was characterized in cryptorchid testes by immunohistochemistry. Serum AMH was detected in intact stallions (n=11, 13.3 ± 1.8 ng/ml) and in hemi-castrated cryptorchid stallions (n=8, 17.6 ± 3.0 ng/ml), but not in geldings (n=6, all data were below the limit of detection). Immunolabeling for AMH was detected in Sertoli cells of undescended testes from cryptorchid horses as well as those of normal testes. Our findings indicate that the cryptorchid testis after hemi-castration secretes AMH and that serum AMH concentrations may be a useful biomarker for diagnosis of equine cryptorchidism.https://www.jstage.jst.go.jp/article/jes/26/1/26_1502/_article/-char/ja