Birth Weights and Gestation in a Captive Rocky Mountain Bighorn Sheep

Blunt, Floyd M.; Dawson, Huey A.; Thorne, E. Tom

doi:10.2307/1379742

Cited by 5 publications

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“…2006), and in some instances young males can inseminate females. In captive populations, 6‐mo‐old and yearling males may successfully copulate with females (Deming 1963; Blaisdell 1976; Blunt et al. 1976; McCutchen 1976).…”

Section: Introductionmentioning

confidence: 99%

“…In the absence of older individuals, young bighorns are more active during rut (Shackleton 1991;Jorgenson et al 1997), advance in dominance hierarchies (Hogg et al 2006), and in some instances young males can inseminate females. In captive populations, 6-mo-old and yearling males may successfully copulate with females (Deming 1963;Blaisdell 1976;Blunt et al 1976;McCutchen 1976). In small, wild populations, yearling males may also mate successfully (Buechner 1960); however, in large populations yearling males rarely participate in mating, but 2-and 3-yr-old males do so (Hogg & Forbes 1997;Coltman et al 2002).…”

Section: Introductionmentioning

confidence: 99%

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Young Bighorn (Ovis canadensis) Males: can they Successfully Woo Females?

2008

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Mating by young males or low male‐to‐female ratios can decrease pregnancy rates and postpone birthdates in ungulates, thereby hindering population growth. Young (2.5–3.5 yr old) male bighorn (Ovis canadensis) behave differently than older males, and age, horn size, mating behavior, and social rank help determine reproductive success. We estimated birthdates in two populations of bighorn sheep in Utah, USA, to determine if mating by young males or low male‐to‐female ratios resulted in fewer young born per female, a shift in mean timing of births, or asynchronous births. When reintroduced, the Rock Canyon population consisted of four males (two each of 2.5 yr old and 1.5 yr old) and a 1 to 7.5 ratio of males (>2 yr old) to adult females (≥3.5 yr old); the Mount Nebo population consisted of four males ≤1.5 yr old and a 0 to 12 ratio of males to adult females. For both populations, the number of young born per female did not differ between the first parturition period after reintroduction (where females were impregnated by males from their source populations) and the second period of parturition (where females were impregnated by young, reintroduced males). Mean birthdates and synchrony (SD) of births did not differ for Rock Canyon (May 12, 2001 ± 4.5 d, May 14, 2002 ± 3.2 d) or Mount Nebo (May 23, 2005 ± 8.1 d, May 22, 2006 ± 10.2 d) between the first and second years following reintroduction. Mating by young males or low male‐to‐female ratios had no demonstrable effect on the number of young born per female or timing and synchrony of births in these populations.

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Section: Introductionmentioning

confidence: 99%