Estimation of the fertility rates of Japanese wild boars (Sus scrofa leucomystax) using fetuses and corpora albicans

• Autorzy: Tsuji T. , Yokoyama M. , Asano M. , Suzuki M.
• Języki publikacji: EN

Abstrakty

EN

Effective population control of Japanese wild boar (Sus scrofa leucomystax) requires reliable information about population dynamics. Fertility rate is the fundamental component of reproduction to evaluate population dynamics. However, little is known regarding the fertility rate of Japanese wild boar. The traditional hunting practices make it difficult to obtain pregnant females and calculate the fertility rate by checking fetuses as is performed in other countries. Therefore, we focused on the corpora albicans (CA) as the CA remains in the ovaries of postpartum females after pregnancy. This study aimed to evaluate the utility of CA and estimate the fertility rate of Japanese wild boars using CA. Histological analysis of ovaries enabled us to discriminate type 1 CA, which remains for 1 year after breeding. Type 1 CA is a superior indicator compared with lactation in the non-pregnancy season because it allows verification of postpartum females over a long period. The fertility rate was calculated by the combination of pregnant and postpartum females using fetuses and type 1 CA from April to November. The fertility rate of the females captured after the second pregnancy season was 90.3 % during the pregnancy period and 100 % during the non-pregnancy period. The high fertility rate of adult females suggests that intensive adult female harvesting is needed. Our new method to determine fertility rates contributes to developing a monitoring system to adequately control Japanese wild boar population.

Słowa kluczowe

EN

estimation; fertility rate; Japanese wild boar; Sus scrofa leucomystax; fetus; corpus albicans zob.tez corpus luteum; non-pregnancy season

• Wydawca: -
• Czasopismo: Acta Theriologica
• Rocznik: 2013
• Tom: 58
• Numer: 3
• Opis fizyczny: p.315-323,fig.,ref.

Twórcy

autor

Tsuji T.

• The United Graduate School of Veterinary Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan

autor

Yokoyama M.

• Wildlife Management Research Center, Hyogo, 940 Sawano, Aogaki-cho, Tanba, Hyogo 669-3842, Japan
• Institute of Natural and Environment Science, University of Hyogo, Hyogo, Japan

autor

Asano M.

• Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan

autor

Suzuki M.

• Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan

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Identyfikatory

DOI

10.1007/s13364-012-0115-8