The relationships among testicular vein and jugular vein concentrations of androgens and estrogens were studied in anesthetized stallions. Blood was sampled from a vein on the surface of the testis and simultaneously from an artery on the surface of the testis and from the jugular vein. Concentrations of total 173hydroxy-androgens and total estrogens were measured for all samples and testostero...

BACKGROUND Since transport evokes physiological adjustments that include endocrine responses, the objective of this study was to examine the responses of circulating beta-endorphin, adrenocorticotrophic hormone (ACTH) and cortisol levels to transport stress in stallions. METHODS Forty-two healthy Thoroughbred and crossbred stallions were studied before and after road transport over distances ...

Twelve stallions that had been given 0, 50 or 200 micrograms testosterone propionate (TP)/kg body weight every other day for 88 days were examined for the effects of androgen withdrawal on spermatozoal production, seminal quality and libido. Although the lower dosage did not affect most of the traits studied, the higher dosage severely reduced scrotal width, spermatozoal production, the number ...

Sexual behavior problems in the stallion include several distinct types of dysfunction. Successful treatment, whether by tradit ional behavior modification or by pharmacological manipulation, usually depends on diagnosis of the specific dysfunctions involved. The following d’ lscussion of behavioral problems, evaluation, and therapy is organized according to the common types of sexual behavior ...

Fluorescence in situ hybridization (FISH) is widely used in the study of chromosome structure and organization. Cytogenetic evaluation of chromosomes using FISH technique plays an increasingly important role in diagnosing karyotype changes in both somatic and reproductive cells. The aim of the study was to optimize the conditions of stallion sperm decondensation, which have a significant effect...

Inhibin B is produced by Sertoli cells, provides negative feedback on FSH secretion, and may prove to be an important marker for the functioning of seminiferous tubules. The purpose of the present study was to examine the relationship between the spermatogenic function of the testis of subfertile men and the plasma concentrations of inhibin B and FSH. These parameters were estimated in a group ...

The seroprevalence of Leptospira spp. and infection risk factors were investigated in horses from a military contingent the Rio Grande do Sul State, Brazil. A total 446 evaluated categorized into 309 mares, 11 stallions, 126 with an average age three years. To determine seroprevalence, serum samples all submitted to microscopic agglutination test against 12 serovars belonging nine serogroups, u...

OBJECTIVE To determine the precise degree of variability that is represented by the reproducibility and reliability of semen analysis. The general assumption is that semen analyses need to be repeated because of a high degree of within-individual variability. However, the precise degree of variability is not well established in male partners of subfertile couples. DESIGN Retrospective cohort ...