The present study was conducted to determine correlation of semen quality with libido in different breeds of bulls. Four mature cattle bulls from each of Friesian, Jersey, Achai, Cross (Friesian x Sahiwal) and Sahiwal in different age (1-3, 3-5 and above 5 years) were selected. For age grouping, data of the entire breed was pooled. Libido was measured in terms of time (seconds) taken for the en...

Postcopulatory sexual selection through sperm competition may be an important evolutionary force affecting many reproductive traits, including sperm morphometrics. Environmental factors such as pollutants, pesticides, and climate change may affect different sperm traits, and thus reproduction, in sensitive bird species. Many sperm-handling processes used in assisted reproductive techniques may ...

Cryopreservation protocols induce partially irreversible damage to mammalian sperm plasma membranes. Previous studies have indicated that adding cholesterol to the plasma membrane, as cholesterol-loaded-cyclodextrins, improves cryosurvival of sperm. Therefore, the purpose of this study was to determine if treating sperm of Markhoz bucks with cholesterol-loaded-cyclodextrins (CLC) (0, 0.75, 1.5,...

Testicular failure (TF) is referring to the condition of testicles which are unable to produce sperm or testosterone. Testosterone is the essential androgen (male sex hormone) for male reproductive function that allows for the development of male genitalia, secondary sex characteristics in prepubescent males, and the maintenance of secondary sex characteristics, initiation and maintenance of sp...

Semen quality and its relationship to fertility are major concern in animal production. The aim of this study was to assess the relationship between frozen thawed sperm characteristics and fertility following in vivo fertility through Artificial Insemination(AI). Semen samples were collected from four buffalo bulls. Semen volume and sperm concentration appeared to be significantly different (P0...

Semen evaluation via traditional light microscopy provides useful information about sperm motility and morphology, yet it has a limited utility in predicting reproductive performance due to its subjective nature and inconsistency among technicians and laboratories. Furthermore, not all sperm abnormalities are detectable with standard light microscopy. As a result, flow cytometric evaluation usi...

BACKGROUND: To investigate the relationship of human semen parameters with season, age and smoking status. METHODS: The present study used data from subjects recruited into an ongoing cross-sectional study on the relationship between environmental agents and semen characteristics. Our population consisted of 306 patients who presented to the Vincent Memorial Andrology Laboratory of Massachusett...

T evolution of sperm traits manifests itself prolifically across species, and postcopulatory sexual selection (PSS), as executed by the female, accompanies this process. The adaptive significance of some sperm traits (for example, the shape and number of sperms) is well understood. However, the evolution of germ size has not been fully exploited. The most recent study by Lüpold et al.1 reveals ...

The presence and role of c-ras proteins were investigated in mature human sperm cells. The v-H-ras monoclonal antibody (mAb) against the c-ras protein, p21, reacted specifically with the acrosomal region of methanol-fixed as well as unfixed-live capacitated and non-capacitated human sperm cell in the indirect immunofluorescence technique. The v-H-ras mAb predominantly recognized c-ras protein o...

Testicular failure (TF) is referring to the condition of testicles which are unable to produce sperm or testosterone. Testosterone is the essential androgen (male sex hormone) for male reproductive function that allows for the development of male genitalia, secondary sex characteristics in prepubescent males, and the maintenance of secondary sex characteristics, initiation and maintenance of sp...