Intratesticular morphometric, cellular and endocrine changes in dromedary bulls exhibiting azoospermia

Semen characteristics and sperm morphology of serow (Capricornis sumatraensis)

The serow (Capricornis sumatraensis) is a critically endangered species. The objectives of this study were to evaluate ejaculate quality in captive males, and to investigate and characterize sperm morphology. Semen was collected using electroejaculation. Mean (+/-S.D.) seminal characteristics were: semen volume 2.3+/-0.8 mL, pH 7.8+/-0.4, and osmolality 329.9+/-32.9mOsmol/kg; sperm concentration 515.8+/-263.1 x 10(6) cells/mL; wave motion score (1-5) 3.9+/-0.4; motile sperm 60.5+/-22%; viable sperm 68.3+/-9.4%; morphologically normal sperm 70.8+/-19.3%; and an opacity that was yellowish to milky-white. Sperm head length, width, degree of elongation, area, and perimeter were 6.0+/-0.6 microm, 4.3+/-0.3 microm, 71.7+/-8.6%, 19.8+/-2.5 microm(2), and 17.9+/-2.1 microm. Based on these measurements, we categorized sperm head morphometry as small, medium, or large. In addition, sperm morphology was examined by light and scanning electron microscopy; overall, morphologically normal and abnormal sperm were similar to those reported for other bovidae. In summary, this study provided baseline data regarding semen characteristics of C. sumatraensis, which should be of value in the preservation of this endangered species.

Infertility in the dromedary bull: a review of causes, relations and implications

Research into infertility in the dromedary bull, as reported during the last two decades, is reviewed with emphasis on causes and effects. Reproductive activity of such animals is naturally limited by a breeding season, though with enough encouragement some may mate with oestrous females out of season but a full fertilization potential can in no way be expected. It is essential that any female presented to a bull is capable of reproducing. The presentation of a subfertile or infertile female due to infection or physiological abnormality will adversely affect the female's ability to conceive and, therefore, the apparent fertility rates of the bull she was put to. The average number of successful services a bull could be expected to perform is two per day. Dromedary bulls with large testes have larger sperm outputs and can cope with more than two females per day providing that they are given adequate periods of rest, 1-2 days every 10 days or so, in conjunction with appropriate nutrition throughout the season. Anabolic steroids or testosterone therapies, which are sometimes used in an attempt to improve male characteristics and bull libido, are not recommended for dromedary bulls in breeding work. Such steroids result in a decrease in testicular size and weight with fewer sperm per gram of testicular tissue being found and the sperm produced also have lower motility rates. Pain associated with the act of mating a she-camel, due to injuries or inflammation in the scrotum, testes, prepuce and sheath, can cause a permanent reduction in bull libido. Camel bulls achieving pregnancy rates more than 60% have had consistently higher spermatozoal concentrations and kinematic variables derived by the computerized cell motion analyzer (CMA) system. As far as physical capabilities are concerned, 3-year-old dromedary bulls, which have reached puberty, have been shown to be perfectly capable of fertilizing a female, but they have a limited sperm production to perform consistently throughout the season in a large herd. By 4.5-5.0 years of age, they are capable of producing adequate numbers of sperm to mate as many as females as an adult bull but fertilizing capacity is not attained until 6 years of age on average. Hyperoestrogenaemia, associated with autoimmune thyroiditis and trypanosomiasis, suppresses the secretion of testicular testosterone and augments the release of testicular histamine, which appears mandatory for quantitative reduction/loss of advanced spermatogenic cells in infertile dromedary bulls.