Cemental Annulations as an Age Criterion in North American Sheep

Turner, Jack C.

doi:10.2307/3800597

Cited by 22 publications

(9 citation statements)

References 6 publications

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“…We collected pharyngeal swabs, blood, and fecal samples at capture for health testing (Cassirer 2005). We aged sheep by tooth replacement (,4 yr) and horn annuli at capture (Geist 1966), and we used cementum analysis (Turner 1977) of incisors to age dead sheep (Matson's Laboratory, Milltown, MT). We determined pregnancy (BioTracking, Moscow, ID) by level of pregnancy-specific protein B in serum and in 2 cases by ultrasound (Drew et al 2001).…”

Section: Methodsmentioning

confidence: 99%

Dynamics of Pneumonia in a Bighorn Sheep Metapopulation

2007

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We investigated the dynamics of 8 populations of a bighorn sheep (Ovis canadensis) metapopulation in Hells Canyon, USA from 1997 to 2003. Pneumonia was the most common cause (43%) of adult mortality and the primary factor limiting population growth. Cougar (Puma concolor) predation was the second most‐frequent source (27%) of adult mortality but did not reduce the rate of population growth significantly. Most pneumonia‐caused mortality occurred in fall and early winter and most cougar predation occurred in late winter and early spring. Average annual survival of adult males (0.84) was lower than females (0.91). Pneumonia was the most common known cause of lamb mortality (86%), and pneumonia‐related mortality was detected whenever summer lamb survival was <50%. Pneumonia‐caused mortality rates in lambs were high from 21 days to 91 days of age and peaked at 42 days to 70 days. Summer pneumonia epizootics in lambs were independent of pneumonia‐caused mortality in adults. Pneumonia‐caused mortality occurred at the population level and was not synchronized geographically or temporally among populations. Although catastrophic all‐age pneumonia‐epizootics have previously been described in bighorn sheep, we found that chronic, although sporadic, pneumonia‐caused mortality in adults and lambs can also have important effects on the dynamics of bighorn sheep populations.

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Section: Methodsmentioning

confidence: 99%

Dynamics of Pneumonia in a Bighorn Sheep Metapopulation

2007

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“…Decalcification was unsuccessful with formic acid or with nitric acid, even when the processing time and concentration were higher than that reported by Low and Cowan (1963), Gilbert (1966), Turner (1977), Morris (1972), Miller (1974), Grue and Jensen (1979) and Quéré and Pascal (1983). The only useful decalcifier was a solution of 14% hypochloric acid and polyvinylpyrrolidone (TBD‐1 ® , Shandon).…”

Section: Resultsmentioning

confidence: 60%

“…Several decalcification techniques were tested following other authors, using formic acid (Low and Cowan, 1963; Gilbert, 1966; Turner, 1977) or nitric acid (Morris, 1972; Miller, 1974; Grue and Jensen, 1979; Quéré and Pascal, 1983). But, as both products did not give satisfactory results, a commercial solution of 14% hypochloric acid and polyvinylpyrrolidone (TBD‐1 ® , Shandon) was used.…”

Section: Methodsmentioning

confidence: 99%

Histological Thin‐Sections: a Method for the Microscopic Study of Teeth in Spanish Red Deer (Cervus elaphus hispanicus)

Azorit¹,

Hervás²,

Analla³

et al. 2002

Anat Histol Embryol

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A method to obtain thin histological sections (4-5 microm thick) from teeth, using a conventional microtome, is described for incisors, molars and canines from Spanish red deer (Cervus elaphus hispanicus). Decalcifying solutions of formic acid and nitric acid at different concentrations were ineffective. This was not the case for a solution of 14% hypochloric acid and polyvinylpyrrolidone (TBD-1(R) of Shandon). However, the time needed to complete decalcification was longer than the time estimated by other authors. Incisors required between 4 and 6 days, molars between 7 and 15 days, and canines between 8 and 12 days. The preparation of histological thin-sections from teeth with a conventional microtome, required some training or prior specialization, because most of defective or lost material occurred during the preliminary stage of the study. However this technique is inexpensive enough to be implemented in any histological laboratory. The preparations obtained are suitable for growth mark observation in dentine and in cementum for dating studies. Nevertheless, they are not suitable for enamel change studies, because the enamel is completely destroyed during the decalcifying process.

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“…The fit between this wear pattern and real age (cementum annuli) is acceptable (r2 = 0.797) and similar to those obtained by other authors (r2 = 0.740, N = 65 in Capreolus capreolus, Ashby & Henry, 1979; r2 = 0.656-0.828, N = 57, N = 27 in Rangijer tarandus, Skogland, 1988;r2 = 0.66, N = 199 in Odocoileus virginianus, DeYoung, 1989). However, the tooth wear method is a poorer age estimator than are horn segments, a method often used in bovids (r2 = 0.999, N = 202 in American sheep, Turner, 1977;r2 = 0975, N = 13 in Rupicapra pyrenaica ornata, Bargagli & Lovari, 1984).…”

Section: Discussionmentioning

confidence: 99%

Determination of age in Cantabrian chamois (Rupicapva pyvenaica pavva) from jaw tooth‐row eruption and wear

Pearez-Barberiaa

1994

Journal of Zoology

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A tooth eruption and wear pattern useful to determine ten age classes when the horns are not available for this purpose, is described for Cantabrian chamois (Rupicapra pyrenaica parva) inhabiting the Cantabrian Mountains (north of Spain). In animals under eight years old, age is not significantly over‐ or under‐estimated when using the method, however, the age of animals older than eight years is significantly under‐estimated.

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Cemental Annulations as an Age Criterion in North American Sheep

Cited by 22 publications

References 6 publications

Dynamics of Pneumonia in a Bighorn Sheep Metapopulation

Dynamics of Pneumonia in a Bighorn Sheep Metapopulation

Histological Thin‐Sections: a Method for the Microscopic Study of Teeth in Spanish Red Deer (Cervus elaphus hispanicus)

Determination of age in Cantabrian chamois (Rupicapva pyvenaica pavva) from jaw tooth‐row eruption and wear

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