Today, there are some 200 different breeds. Goats have been used by the U.S. Fish and Wildlife Service, the Bureau of Reclamation, the Bureau of Land Management, and the U.S. Forest Service. State, county and city contractors (such as the city of Seattle) have also used goats for weed and invasive species control.
Recent data has redefined the way that urologists look at PSA, and what is considered a normal PSA. Age-adjusted PSA values take into account that a 40-year-old should not have the same PSA as an 80-year-old. Accepted age-adjusted PSA rates are below 2.4 ng/ml for men under the age of 50 and 6.5 ng/ml for patients in their 70s. Other limits have been defined for varying age ranges, but there is not universal agreement about the accuracy of the age-adjusted levels.
Older male adults tend to have higher levels of PSA than younger men. The normal levels of PSA as per the age are listed below: 1  Men below the age of 50 years have normal PSA levels that are less than 2.5 ng/mL. 2  Men in the range of 50 to 59 years have normal PSA levels that are less than 3.5 ng/mL.lder male adults tend to have higher levels of PSA than younger men. The normal levels of PSA as per the age are listed below: 1  Men below the age of 50 years have normal PSA levels that are less than 2.5 ng/mL. 2  Men in the range of 50 to 59 years have normal PSA levels that are less than 3.5 ng/mL.