Uniparous 



Refers to an animal that produces only one egg or one 

 offspring at one time. 



Unisexual 



Refers to an organism that is either male or female, cf. 

 Hermaphrodite. 



Univoltine 



Refers to an organism that has only one generation in a 

 year. cf. Multivoltine , Diapause. 



Unpalatable 



Refers to plants and other kinds of food that are not 

 readily eaten by animals. 



Unspecialized 



Not Specialized (q. v.). 



Upper Austral Life Zone 



One of the divisions in Merriam's Austral life zone (q. v.). 



Upper Sonoran Life Zone 



See Sonoran life zone. 



Use, Actual 



The total number and period of time livestock graze 

 on a range, usually expressed as animal-unit months, cow 

 months, or sheep months. 



Use, Common 



The practice of grazing a given range by more than one 

 kind of livestock within the same grazing year. 



Use, Dual 



The grazing of a range area by more than one kind of 

 livestock at the same time, such as cattle and sheep. 



Use, Proper 



The utilization of a Range so that the Condition is 

 maintained in a good to excellent rating. 



361 



