Extensive and inappropriate use of antibiotics leads to many health problems worldwide. Particularly, previous research reveals that antibiotics have harmful effects on males impairing negatively sperm parameters during the treatment period (Ahmadi et al., 2016). This exposure to different antibiotics could decline male fertility both in humans and animals with effects on spermatogenesis or sperm function. This has been demonstrated in different species including rams, peccaries, mice, and rats when investigating how antibiotics could affect sperm quality (Tanyildızi and Bozkurt, 2003a; Tanyildızi and Bozkurt, 2003b; El‐Harouny et al., 2010; Santos et al., 2021). However, the spermato-toxicity of antibiotics in breeding roosters is still unknown.
In the current investigation, we tested the effects on rooster sperm of Ampicillin, Enrofloxacin, Colistin, and both Sulfaquinoxaline, Sulfamethazine belonging respectively to Beta-lactams, Fluoroquinolones, Polymyxines (polypeptide), and Sulfonamides antibiotic families. These drugs are indicated for the prevention and treatment of bacterial infections caused by susceptible gram-positive and gram-negative germs..
The present study showed that significant variations were found between the four groups. The average volume was slightly increased on the 3rd day of treatment in Ampicillin group. The opposite effect was observed with Enrofloxacin and Colistin, which decreased sperm volume, particularly after 3 days of treatment. As the ejaculate volume for a large part is determined by the production of seminal fluid, this heterogeneity could be related to variable antibiotics effects on reproductive secretory glands (Vicari et al., 2016).
Three days after the antibiotic therapy, Enrofloxacin and Colistin showed a significant reduction in sperm count, viability and sperm motility. The results are in agreement with those reported by ElSawy et al. (2018) who showed that the administration of Enrofloxacin (18 mg/kg of body weight) to mature male rats causes a decrease in sperm motility and count and increases total sperm abnormalities with some histopathological alterations in the reproductive organs. This is also reported by Aral et al. (2008) who suggest that administration of Enrofloxacin to male mice at 150 mg//kg b.wt) would lead to a significant decrease both in sperm count and sperm motility with increased abnormal spermatozoa rate. Similar results are reported with Fluoroquinolones revealing negative effects on testis tissue, a significant decrease in sperm count, viability, motility, and increased apoptotic cells in male rats (Ebadimanas et al., 2018).
Regarding polypeptide antibiotics, it is showed previously that Colistin causes a variety of adverse effects, particularly in rats with decreased sperm motility and increased sperm abnormality, overexpression of oxidative stress, apoptosis, and autophagy expression in testis (Aksu et al., 2018; Aksu et al., 2020; Bouchicha et al., 2022). These negative effects associated with some antibiotics could be related to a decline in anti-oxidant enzymes through the production of reactive-oxygen-species, disorder in proliferation cells in the tubules, a toxic effect on sperm cell membranes and reproductive hormones (Drobnis and Nangia, 2017; Manas and Najafi, 2017). However, Qadeer et al. (2013) suggest that Colistin in combination with Penicillin does not deteriorate semen quality.
Ampicillin group showed a significant decrease in PM and gametes velocities and sperm count after 9 days of treatment. However, no significant effect was observed concerning sperm viability, TM, and LIN. Ampicillin presents fewer negative effects on sperm motility parameters in comparison with Enrofloxacin and Colistin. The effects of Ampicillin were previously reported by Gupta et al (2013), suggesting reversible infertility in male rats. Raji et al (2006), reported that Ampicillin caused a significant decrease in sperm counts, motility, and gametes viability. Additionally, there is a significant reduction (p<0.05) in the weight of the testes, epididymis, seminal vesicles, and prostate glands and a significant decrease in testosterone levels. The same results were found by ElSawy et al. (2018), who suggest that rats injected with Ampicillin at a dose of 40 mg/kg express reduced testes, epididymis, and accessory sex organs weights, with a negative change in sperm characters with decreased sperm count and motility, and increased sperm abnormalities. According to Gupta et al (2013) the reduction of sperm motility, count, and weight of sexual organs could be attributed to decreased fructose and proteins levels that affect glycoproteins secreted by the epididymis.
A wide variety of sulfonamides (Foote and Salisbuby, 1948) are used to treat bacterial infections and to prevent coccidiosis. Several sulfonamides are combined with trimethoprim to potentiate their effect and exhibit a broader antibacterial spectrum (Plumlee, 2004). In our study, sulfonamides affected positively sperm parameters. All sperm velocities have expressed the same tendency with a significant increase during the study period. A positive effect on TM, PM, and viability was also observed. However, a marked reduction in sperm volume and sperm count on the 9th day of treatment was observed. This antibiotic was able to enhance sperm motility probably through the elevation of testosterone level as previously suggested by Tanyildızi and Bozkurt (2003b) who used a therapeutic dose of trimethoprim/sulfamethoxazole in rams, and showed that the percentage of motile sperm is higher compared to the control group. Nevertheless, sperm concentration and total sperm count are significantly decreased similarly to the current results. In human, sulfamethoxazole and trimethoprim association improve men's semen quality with confirmed prostatisis (Drobnis and Nangia, 2017). However, Salarkia et al. (2017), reported that rats treated with a combination of sulfamethoxazole and trimethoprim showed a significant decrease in the percentage of sperm number, motility, viability and testes structural abnormalities at high doses. Other reports showed that some sulfonamide derivatives have a negative effect on ejaculate volume, sperm concentration, total sperm count, semen viscosity, and sperm motility in human (Hellstrom and Sikka, 2009). Similar results are reported in the rat by Schlegel et al. (1991) about a spermatotoxic effect of sulfasalazine on sperm quality. They showed particularly an overexpression of oxidative stress, which in turn might act as a possible mechanism of male-induced infertility (Alonso et al., 2009).