Sexual Behavior and Hormonal Profiles in Arab Stallions

Monthly Evaluation of Testicular Biometry and Sexual Behavior With Respect to Seminal Aspects of Arabian Stallions Under Subtropical Conditions in Kuwait

“…Assessment of the sexual behavior of stallion is critically important as it is closely linked to reproductive efficiency (Rua et al, 2015). The sexual beheviour is the highest in summer and spring, however it is usually reduced in winter (Waheed et al, 2015). Additionally, sexual behavior, ejaculate volume, total sperm output and motility were found to be higher during summer and spring compared to winter (Suliman et al, 2020).…”

Andrological characterisation of Chilean purebred stallions

“…Contrary, in the Arabian horse the testosterone concentrations increase in old stallions (El-Maaty et al 2014) while also establishing a strong correlation with the fat coverage, variable not yet studied in the purebred Chilean stallion, most probably because Chilean Purebred Horses do not tend to accumulate fat with age. Regarding the concentration of oestrogen, the purebred Chilean stallion show no variation of this variable according to seasonality, however in the Arab breed has been observed a strong decrease of oestrogen in winter reaching half levels of this hormone (Waheed et al 2015), demonstrating another relevant difference attributable to the breed. Based on our data, we suggest that the evaluation of oestrogen and testosterone alone cannot be used as sole variables for estimating fertility in purebred Chilean stallions, being necessary to perform a more complete andrological examination that considers other parameters such as age and seasonality, as demonstrated in this study.…”

“…In the present study, the plasmatic concentration of testosterone in the purebred Chilean stallion decreased significantly during winter and in the aged stallion. In the Brazilian pony (Rua et al 2017) and the Arabian horse (Waheed et al 2015), the testosterone concentration also showed to decline in winter. Contrary, in the Arabian horse the testosterone concentrations increase in old stallions (El-Maaty et al 2014) while also establishing a strong correlation with the fat coverage, variable not yet studied in the purebred Chilean stallion, most probably because Chilean Purebred Horses do not tend to accumulate fat with age.…”

“…In Arabian and Thoroughbred stallions, the seminal quality also decreases during winter mainly because its reproductive functionality depends on the photoperiod and the daily light hours, for example: testicle volume (summer 380 ± 20; winter 220 ± 20 cm 3 ), seminal volume (summer 92 ± 11; winter 61 ± 8 mL), spermatic motility (summer 73 ± 4; winter 63 ± 3 %) (Janett et al 2003, Pereira et al 2012, Aurich 2016. Moreover, testosterone and oestrogen values are frequently used as fertility indicators during andrological examination of the stallions, however, they also vary over a year showing lower testosterone plasmatic concentration during winter in Arabian stallions (summer 798.62 ± 47.24; winter 572.42 ± 95.13 pg/mL), therefore, its clinical interpretation should be done carefully (Waheed et al 2015). Despite these reference values, it is necessary to make an objective evaluation of each patient to know the differences of andrological variables between particular breeds of stallions.…”

Effect of housing system on reproductive behaviour and on some endocrinological and seminal parameters of donkey stallions

“…In stallions, yet, there is little correlation between androgen concentration and the sexual behaviour characteristics (Pickett, Squires, & Voss, ; Silva Rua et al., ). Low concentration of peripheral testosterone was accompanied with physiologic sexual behaviour, and administration of exogenous testosterone to horse stallions did not enhance libido (Berndtson, Hoyer, Squires, & Pickett, ; Waheed, Ghoneim, & Abdou, ). Veronesi et al.…”