Split parturition observed in a captive North American brown bear (Ursus arctos).
Zoo Biol
; 31(2): 255-9, 2012.
Article
em En
| MEDLINE
| ID: mdl-22025081
ABSTRACT
Reproductive physiology in North American ursids is characterized by mating from spring to early summer, delayed implantation, and birth during hibernation. During spring 2008, a captive adult female brown bear was mated with two adult males. Pregnancy was determined by elevated progesterone concentrations during late fall before hibernation. Two male cubs were born on December 31, 2008, and a third female cub was born 17 days later on January 16. All were successfully raised and all were confirmed to have identical paternity. When normalized to age, cub growth rates did not differ. To our knowledge, this is the first documented case of markedly different birth dates in a single litter of brown bear cubs.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ursidae
/
Parto
/
Animais de Zoológico
Limite:
Animals
/
Pregnancy
Idioma:
En
Revista:
Zoo Biol
Assunto da revista:
BIOLOGIA
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Estados Unidos