Differences In Antler Growth Among Mule Deer In Different Regions?

Geographic Variation in Antler Growth

Mule deer in the western regions of Colorado, such as the Rocky Mountains and the Uncompahgre Plateau, tend to have larger antlers than those in the eastern regions. For example, a study found that mule deer in the Gunnison National Forest had average antler scores of 120-140, while those in the Comanche National Grassland had average antler scores of 80-90. This variation in antler growth can be attributed to differences in habitat quality, with western regions providing more abundant and nutritious vegetation.

Effects of Genetics and Nutrition

Antler growth is influenced by genetics, and mule deer from different regions have unique genetic profiles that affect antler development. Nutrition also plays a critical role, with mule deer that have access to high-quality forage and adequate water tend to grow larger antlers. A study found that mule deer that grazed on high-quality forage had average antler scores that were 20-30 points higher than those that grazed on low-quality forage.

Age and Sex Differences

Antler growth also varies with age and sex, with mature males typically having larger antlers than younger males and females. In western Colorado, a study found that 90% of males with antler scores above 120 were at least 5 years old, while 75% of males with antler scores below 80 were less than 4 years old. This highlights the importance of age and sex in determining antler growth in mule deer.