A Comparison of Tooth Eruption and Wear and Dental Cementum Techniques in Age Determination of New Zealand Feral Pigs.

1992 ◽  
Vol 19 (6) ◽  
pp. 769 ◽  
Author(s):  
CMH Clarke ◽  
RM Dzieciolowski ◽  
D Batcheler ◽  
CM Frampton
Keyword(s):  
New Zealand ◽  
Age Determination ◽  
Tooth Eruption ◽  
Permanent Teeth ◽  
Dietary Factor ◽  
Feral Pigs ◽  
Wild Pigs ◽  
Dental Ageing ◽  
Strong Agreement

This study evaluates dental ageing techniques for feral pigs in northern South I., New Zealand. Ages of pigs were estimated by three techniques: tooth eruption and replacement on criteria calibrated from pen-reared American-bred European wild pigs; tooth eruption, development, and wear calibrated from known-age feral pigs from the study area; and annular growth in cementum of molariform teeth. All age estimations showed strong agreement with each other and with known ages. The eruption and replacement criteria were most useful for ageing pigs less than 30 months old, whereas the other two criteria were more suited to ageing pigs more than 30 months old. All permanent teeth of New Zealand feral pigs erupted 1-2 months earlier than in European and Malayan wild pigs, and permanent premolars erupted up to 4 months earlier than in Japanese wild pigs. Earlier eruption may reflect early onset of maturity in New Zealand pigs. The clarity of annuli observed varied between animals, but generally increased with age. Pigs from unforested habitat had a higher percentage of clearly defined annuli than those from forested habitat. This may be explained by a climatic or dietary factor.

scholarly journals Relative age determination of the skull of the chacma baboon (Papio ursinus)

1983 ◽  
Vol 2 (4) ◽  
pp. 215-223
Author(s):  
J. P. Van Niekerk ◽  
O. B. Kok ◽  
L. P. Stoltz
Keyword(s):  
Nature Reserve ◽  
Age Groups ◽  
Age Determination ◽  
Permanent Teeth ◽  
Reliable Estimate ◽  
Papio Ursinus ◽  
Relative Age ◽  
Complete Set ◽  
General Size

Relative age determination was carried out on the skulls of 261 chacma baboons (Papio ursinus), 117 from the Loskopdam Nature Reserve and 144 from the Messina district in the Northern Transvaal. Seven age groups were distinguished, of which classes I-IV were based on the eruption and displacement of milk and permanent teeth. Adults with a complete set of permanent dentition were subdivided into three additional classes (V- VII), mainly on the basis of the degree of molar attrition. For comparative purposes the pattern of maturation of craniometric parameters which reflect the general size and shape of the skull, as well as the degree of closure of ectocranial sutures, were treated on the same basis. From this it is apparent that a most reliable estimate of relative age can be obtained by using all the above-mentioned criteria.

A Comparison of Three Ageing Techniques for Feral Pigs From Subalpine and Semi-Arid Habitats.

1993 ◽  
Vol 20 (2) ◽  
pp. 163 ◽  
Author(s):  
D Choquenot ◽  
G Saunders
Keyword(s):  
Arid Area ◽  
Tooth Eruption ◽  
Arid Areas ◽  
Stochastic Variation ◽  
Feral Pigs ◽  
Wild Pigs ◽  
Eastern Australia ◽  
Semi Arid ◽  
Age Estimates

Three ageing techniques were tested on samples of wild-caught feral pigs from subalpine (n =35) and semi-arid (n =64) areas in eastern Australia, and on a sample of known-age captive feral pigs reared from stock from semi-arid areas (n =15). Techniques employed were based on morphometric relationships, patterns of tooth eruption and wear, and counts of cementum lines in permanent incisors. Cyclic seasonal conditions led to apparently annular cementum line deposition for pigs from the subalpine area. In contrast, stochastic variation in seasonal conditions led to irregular cementum line deposition in pigs from the semi-arid area and captive-reared pigs of semi-arid stock. On the assumption that cementum lines are annular in pigs from the subalpine site, patterns of tooth eruption and wear and morphometrics returned reasonably accurate age estimates, the former being more precise. Patterns of tooth eruption and wear returned reasonably accurate age estimates for known-age captivereared pigs, whereas morphometrics gave increasing underestimates of age for progressively older pigs. On the assumption that patterns of tooth eruption and wear return similarly accurate age estimates for wild pigs from the semi-arid area, morphometrics again underestimated true age. A correction to the morphometric technique to improve its accuracy for semi-arid areas is given.

Age Determination in Bennett's Wallaby, Macropus rufogriseus fruticus (Marsupialia), in South Canterbury, New Zealand

1979 ◽  
Vol 6 (1) ◽  
pp. 13 ◽  
Author(s):  
DC Catt
Keyword(s):  
New Zealand ◽  
Layer Structure ◽  
Age Determination ◽  
Cheek Tooth ◽  
Use Of Data

The ages of 325 Bennett's wallabies were determined from annuli laid down in the periosteal zone of the mandible just in front of the cheek tooth row. The regression of age so determined on molar index was: In (age in months) = 1.8979+0.7727M. There were no significant differences between ages estimated from this regression and those given by Kirkpatrick, who used captive red-necked wallabies of known age. Age could not be estimated from the complex layer structure of tooth cementum. Pouch young were aged from foot and tail lengths by use of data from Kirkpatrick (1965) for captive red-necked wallabies. The problems involved with age determination of pouch young from those data are discussed; the method is considered to be adequate at present.

Age estimation of barracouta (Thyrsites atun) off southern New Zealand

2002 ◽  
Vol 53 (8) ◽  
pp. 1169 ◽  
Author(s):  
P. L. Horn
Keyword(s):  
New Zealand ◽  
Validation Study ◽  
Age Estimation ◽  
Growth Parameters ◽  
Age Determination ◽  
Von Bertalanffy ◽  
Commercial Catch ◽  
Frequency Distributions

Age determination of barracouta (Thyrsites atun) by counting translucent zones in whole otoliths was validated by examining the number of zones in otoliths from consecutive juvenile modes and following the progression of a strong year class in age-frequency distributions. Readings from whole otoliths, rather than otolith sections, do not result in under-ageing of this species. The ageing interpretation was supported by the progression of a length mode in commercial catch samples over 5 years. The available data indicated a wide variation in year class strengths between years, a characteristic that was very useful in the validation study. Von Bertalanffy growth parameters were calculated, separately by sex, for barracouta from the Southland shelf, New Zealand. Female barracouta reach a significantly larger size than males.

Analysis of Fibronectin and TGF-β1 Immunoexpression to Determination of Wound Vitality in Wistar Rats (Rattus norvegicus)

2015 ◽  
Vol 1 (1) ◽  
Author(s):  
Nita Novita ◽  
Hasrayati Agustina ◽  
Bethy S. Hernowo ◽  
Abdul H. Hassan
Keyword(s):  
Rattus Norvegicus ◽  
Wistar Rats ◽  
Age Determination ◽  
Scientific Field ◽  
Wound Age ◽  
Forensic Practice ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Tgf Β1

Wound examination is indispensable in forensic practice. The scientific field of wound age determination has advanced progressively during recent years.The purpose of this study was to determine the differences of fibronectin and TGF-β1 expression in both antemortem and postmortem wounds. This study was an experimental with completely randomized design.  The skin wounds (vital and postmortem) were taken from fourty Wistar rats and divided into 10 groups of rats. Immunohistochemical staining was performed to determine the differences between antemortem and postmortem wounds. The result showed that in 30 minutes after antemortem wound infliction, all of samples showed weak reactivity for fibronectin and TGF-β1 (100%).  In first hour after wound infliction, 3 samples (75%) showed weakly positive and 1 sample (25%) strongly positive for fibronectin and TGF-β1.  In 2 hour after wound infliction, 1 sample (25%) showed weakly positive and 3 sample (75%) strongly positive for fibronectin and TGF-β1.  In 3 and 4 hour after wound infliction, all of samples strongly positive for fibronectin and TGF-β1.  In postmortem wound, all of samples showed negativity for fibronectin and TGF-β1. In conclusion, fibronectin and TGF-β1 may be useful in the determination of wound vitality. Keywords: wound, fibronectin, TGF-β1, vitality

Hisotological and radiographic determination of the age of physeal closure of the distal femur, proximal tibia, and proximal fibula of the New Zealand white rabbit

1994 ◽  
Vol 12 (5) ◽  
pp. 747-749 ◽  
Author(s):  
Moises Kaweblum ◽  
Maria Del Carmen Aguilar ◽  
Eduardo Blancas ◽  
Jaime Kaweblum ◽  
Wallace B. Lehman ◽  
...  
Keyword(s):  
New Zealand ◽  
Distal Femur ◽  
Proximal Tibia ◽  
Zealand White Rabbit ◽  
Proximal Fibula ◽  
New Zealand White Rabbit ◽  
Physeal Closure
Sign in / Sign up

Export Citation Format

Share Document