This experiment was carried out on Ouled Djellal rams in order to study the effect of season on testicular size, serum testosterone level and semen characteristics for a period of one year. Blood samples were obtained via jugular vein, and semen was collected by using an electro-ejaculator from six fertile male rams (2-4 years of age) on a monthly basis. In this breed, testis parameters varied seasonally showing the highest average values during autumn. However, the variation of body weight, GSI, serum testosterone levels, mass motility, individual motility and sperm concentration were not significant during the sampling period. The results reported show that the lowest and highest levels of semen volume were recorded in winter (0.62±0.11 ml) and in autumn (1.23±0.09 ml) respectively. The pH value and total number in sperm showed a uniform pattern with low scores during breeding season and high scores in non-breeding season. High percentage of live sperm was recorded during the summer, and high percentage of abnormal sperm was recorded during winter.

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Several studies have shown relationship of biometric testicular, hormonal profiles and fertility. Objective of present research were to predict the fertility of stallion by biometric testicular and hormonal analysis. Measurement of the testis of adults Arabian stallions (n=36) from National Haras Chaouchoua of Tiaret, Algeria. The length (TL), the width (TW), the height (TH), and the scrotal width of the testicles (TSW) during three consecutive seasons (April: 2014(April: -2016. From these measurements, the total testicular volume (TTV), the daily sperm output (DSO) and the daily sperm product (DSP) were calculated. The serum testosterone concentration, the follicle-stimulating hormone (FSH) and the luteinizing hormone (LH) were also evaluated by IMMUNOTECH® during April 2016.The scrotal width (TSW: 11.06 ± 1.55) cm, was very highly correlated to the age and the body weight of the stallions as well as with all the testicular parameters (p<0.01). The scrotal width (TSW) was correlated positively to testosterone, (r=0,14).The examination of the testicular size is an important criteria to estimate for selection the stallions with highest fertility potential.

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This study was carried out at National Haras of Tiaret (west of Algeria) to understand and to compare the normal sexual behavior and libido of stallions (Arabian vs Barb) while mounting a mare in estrus. Eighty-four stallions were divided into two groups from 5 to 24 years of age (n=47 Arabian; n=37 Barb). Results revealed significant differences between Arabian and Barb stallion: in sniffing (p less than 0.001), libido score (p less than 0.05), flehmen response (p less than 0.05), time to first mount with erection (p less than 0.05), number of mounts to ejaculation (p less than 0.05) and mount time for ejaculatory (p less than 0.01). These stallions were exactly tested in the same place and conditions allowed us to discard any side effects due to animal management or any other confounding bias. Our study provided us the knowledge of sexual behavior under Algerian environmental conditions and the distinction between Arabian and Barb stallion in their sexual behavior expression.