Effects of population density on horn development in bighorn rams

Article Abstract:

Many populations of ungulates are managed with the purpose of providing trophy hunters with large-horned males but little research has been conducted into the effect of population density on the horn growth of males. A long-term study of a population of bighorn sheep in Alberta, Canada, investigates whether horn growth is affected by population numbers. It is shown that increases in the number of adult yews and yearlings results in thinner, shorter horns. It is concluded that a reduction in ewe numbers in high-density populations could prevent horn decreases in bighorn sheep.

Research, Natural history, Growth, Wildlife management, Alberta, Population density, Horns, Horns (Anatomy)

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Harvesting bighorn ewes: consequences for population size and trophy ram production

Article Abstract:

Ewe hunting reduces the population and increases the trophy ram size. Rams that are born during the ewe removal period have bigger horns than the rams that are born in the post removal years. An increase in the density of the ewes with a history of pneumonia is alarming and hunting should be prohibited in such areas because there is not much growth in population, and hunting would cause a further decline in their number.

Statistics, Wildlife conservation, Hunting, Ewes

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A test of long-term fecal nitrogen monitoring to evaluate nutritional status in bighorn sheep

Article Abstract:

Research demonstrates that fecal nitrogen is a useful tool for assessing nutritional status, body growth, and population density in bighorn sheep. Data were obtained from 23 years of data gathering and assessment.

Canada, Methods, Food and nutrition, Nutritional aspects, Foraging, Foraging (Animal feeding behavior), Stool specimen analysis

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