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An orchidometer can measure testicular volume, which in turn is tightly associated with both sperm and hormonal parameters. [6] A physical exam of the scrotum can reveal a varicocele, but the impact of detecting and surgically correct a varicocele on sperm parameters or overall male fertility is debated. [6]
These animals are usually sterile due to the different numbers of chromosomes between the two parents. The imbalance results in offspring that is viable but not fertile, as is the case with the mule. Sterility can also be caused by selective breeding, where a selected trait is closely linked to genes involved in sex determination or fertility.
Male-sterile plants can set seed and propagate. Female-sterile plants cannot develop seeds and will not propagate. Manifestation of male sterility in CMS may be controlled either entirely by cytoplasmic factors or by interactions between cytoplasmic factors and nuclear factors. Male sterility can arise spontaneously via mutations in nuclear ...
Sterile males are deliberately produced by humans in several species for several unrelated purposes: Sterile insect technique – for insect pest control Cytoplasmic male sterility – for plant breeding
Chemical, e.g. drug-based methods are available, e.g. orally-administered Lonidamine [8] for temporary, or permanent (depending on the dose) fertility management. Boris [ 9 ] provides a method for chemically inducing either temporary or non-reversible sterility, depending on the dose, "Permanent sterility in human males can be obtained by a ...
Klinefelter syndrome (KS), also known as 47,XXY, is a chromosome anomaly where a male has an extra X chromosome. [10] These complications commonly include infertility and small, poorly functioning testicles (if present).
Sterile or sterility may refer to: Asepsis, a state of being free from biological contaminants; Sterile (archaeology), a sediment deposit which contains no evidence of human activity; Sterilization (microbiology), any process that eliminates or kills all forms of life or removes them from an item or a field
Vasectomy is an elective surgical procedure that results in male sterilization, often as a means of permanent contraception.During the procedure, the male vasa deferentia are cut and tied or sealed so as to prevent sperm from entering into the urethra and thereby prevent fertilization of a female through sexual intercourse.