Gestational Age Determination, Variation of Conception Date, and External Fetal Development of Sika Deer (Cervus nippon yesoensis Heude,1884) in Eastern Hokkaido.

Suzuki, Masatsugu; Kaji, Koich; Yamanaka, Masami; Ohtaishi, Noriyuki

doi:10.1292/jvms.58.505

Cited by 37 publications

(36 citation statements)

References 10 publications

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“…This suggests that crown formation was completed before the third calcein injection in late October. Because the sika deer is a seasonal breeder with calving time concentrated in May and June (with some exceptions) [14,16,20], the present findings suggest that enamel formation of the first molar is completed at the age of 5 months at the latest. Dentin formation continues for a longer time, until the pulp cavity is filled; thus, dentin incremental lines can be used to determine a wider ranges of ages than enamel incremental lines.…”

Section: Discussionmentioning

confidence: 77%

Dental Incremental Lines in Sika Deer (Cervus nippon); Polarized Light and Fluorescence Microscopy of Ground Sections

Iinuma

Tanaka

Kawasaki

et al. 2004

The Journal of Veterinary Medical Science

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ABSTRACT. Periodic growth incremental lines are found universally in dental hard tissues. This periodicity theoretically allows for estimation of age, even in days, which would be useful in studies of wild animals. In the present study, enamel and dentin increments of the sika deer (Cervus nippon) were observed in ground sections with a polarized light microscope, and their periodicity was examined by the use of a chronological labeling method with fluorochromes. Enamel increments occurred at a mean interval of 10.6 (SD=1.5) µm, and mean spacing of dentin increments was 17.3 (SD=1.8) µm. Fluorochromic marking revealed that incremental lines form each day in enamel and almost every second day in dentin. The fluorescence-labeled lines suggest that enamel formation of the first m olar is complete by the age of 5 months. Due to its longer interval of incremental lines and longer term of formation, we conclude that dentin is more suitable than enamel for day-age estimation in sika deer. Experimental confirmation of incremental growth periodicity in various species can improve the reliability of use of tooth increments for age estimation and life history reconstruction.

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Section: Discussionmentioning

confidence: 77%

Dental Incremental Lines in Sika Deer (Cervus nippon); Polarized Light and Fluorescence Microscopy of Ground Sections

Iinuma

Tanaka

Kawasaki

et al. 2004

The Journal of Veterinary Medical Science

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“…For example, in black tailed deer (Odocoileus bemionus columbianus), the first individuals to reach the BW threshold for mating, conceive early in the breeding season [21]. In addition, yearling sika deer (Cervus nippon yesoensis) females in good body condition are estimated to have earlier than normal parturition periods [25]. In captive raccoons, onset of the first mating period is reported to be stimulated by the lengthening photoperiod and sufficient nutrition [4].…”

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confidence: 99%

Difference in Age at First Conception between Early and Late Litters of Feral Raccoon (<i>Procyon lotor</i>) in Kanagawa Prefecture

Kato

Uno

Fujioka

et al. 2012

The Journal of Veterinary Medical Science

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ABSTRACT. Due to the long parturition period of raccoons, we assumed that age at first conception of late born females was later than that of early born females. From March 2005 to September 2008, 201 females estimated to be younger than 24 months were separated into early-and late-born groups on the basis of their estimated birth month (to the nearest 2 months), and parous status and body mass index (BMI) were examined. Age at first conception of late-born females (over 18 months old) was estimated to be later than that of early-born females (over 12 months old). The average BMI in early-born individuals at 12 months old might have affected their ability to conceive because of body fat deposition.

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“…. In Japanese mainland, the reproductive behavior of wild sika deer is manifested between October to December, with the delivery of newborn in early summer following 217 days of gestation [6]. Their reproductive organs sh o w c h a r a c ter is t ic c ha n g e s a c c o r d in g t o reproductive status and exert influence on the plasma hormone profiles in both genders [7,8].…”

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confidence: 99%

A Direct Time-resolved Fluorescent Immunoassay(TR-FIA) for Measuring Plasma Progesterone Concentration in the Sika Doe (Cervus nippon centralis).

Takahashi

Hamanaka

Ikeda³

et al. 2001

Journal of Reproduction and Development

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Abstract.A direct time-resolved fluorescent immunoassay (TR-FIA) system was developed and evaluated for measuring progesterone (P) concentrations in deer plasma. The minimum detectable level of this assay system was 0.25 ng/ml and ED 50 value of standard curve was 2.4 ng/ml. Intraand inter-assay coefficients of variation were 8.8% and 15.7%, respectively. The direct TR-FIA revealed that the plasma P concentrations in sika deer expressed a diurnal pattern depending on their reproductive status. Results in the present study indicate that the TR-FIA system, that is specifically designed for humans if successfully utilized with slight modification, can be utilized for direct assaying of P in deer plasma. The plasma P profile in the sika deer appears to be consistent to that of other temperate deer expressing seasonal breeding characteristics. . In Japanese mainland, the reproductive behavior of wild sika deer is manifested between October to December, with the delivery of newborn in early summer following 217 days of gestation [6]. Their reproductive organs sh o w c h a r a c ter is t ic c ha n g e s a c c o r d in g t o reproductive status and exert influence on the plasma hormone profiles in both genders [7,8]. In t h e r e i n d e e r , p l a s m a p r o g e s t e r o n e ( P ) concentration well reflects the luteal function and it has been a useful parameter for determining the repr oductive sta tus [9], h owever de ta iled information about plasma P concentrations in the sika deer is still limited.There are two major problems in analyzing P concentration in wild deer; one is the difficulty of serial sampling from animals and the other is a reliable and safe assay procedure. In reports published to date, plasma P analysis in the deer has been carried out by radioimmunoassay [10][11][12]. The handling of radioactive materials is strictly regulated by law and procedures have to be carried out in designated areas. Therefore a simple procedure for measuring plasma P concentration in the deer, that could be routinely carried out in a conventional laboratory would be of tremendous advantage.The time-resolved fluorescent immunoassay (TR-FIA) is one of the immunoassays employing

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Gestational Age Determination, Variation of Conception Date, and External Fetal Development of Sika Deer (Cervus nippon yesoensis Heude,1884) in Eastern Hokkaido.

Cited by 37 publications

References 10 publications

Dental Incremental Lines in Sika Deer (Cervus nippon); Polarized Light and Fluorescence Microscopy of Ground Sections

Dental Incremental Lines in Sika Deer (Cervus nippon); Polarized Light and Fluorescence Microscopy of Ground Sections

Difference in Age at First Conception between Early and Late Litters of Feral Raccoon (<i>Procyon lotor</i>) in Kanagawa Prefecture

A Direct Time-resolved Fluorescent Immunoassay(TR-FIA) for Measuring Plasma Progesterone Concentration in the Sika Doe (Cervus nippon centralis).

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