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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]
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Sterility can also be caused by selective breeding, where a selected trait is closely linked to genes involved in sex determination or fertility. For example, goats breed to be polled (hornless). This results in a high number of intersex individuals among the offspring, which are typically sterile.
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
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In the 1960s, the governments of three Indian states and one large private company offered free vasectomies to some employees, occasionally accompanied by a bonus. [28] In 1959, the second Five-Year Plan offered medical practitioners who performed vasectomies on low-income men monetary compensation.