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Differences in the gonadal cycles of adult and yearling blue grouse dendragapus obscurus fuliginosus


, : Differences in the gonadal cycles of adult and yearling blue grouse dendragapus obscurus fuliginosus. Canadian Journal of Zoology 57(6): 1283-1289

Gonadal cycles of adult and yearling female and male blue grouse (D. o. fuliginosus) collected from Vancouver Island, British Columbia [Canada], are described and compared. Reproductive organs of yearling females develop later, produce eggs at a lower oviduct weight and regress faster to a lower oviduct weight than do those of adults. Yearling males, although most do not breed, go through the entire gonadal cycle and produce viable sperm. Testes of yearlings develop later, have a lower volume and regress earlier than those of adults. Yearlings of both sexes appear less sexually mature than adults but delays in or lack of breeding may be partaly a result of social interaction with resident adults.

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Related references

Sopuck L.G.; Zwickel F.C., 1983: Re nesting in adult and yearling blue grouse dendragapus obscurus. Eight of 31 radio-tagged female blue grouse (D. obscurus) that had 1st nests terminated before hatch produced 2nd clutches. Significantly more adult than yearling hens renested. All yearling hens that produced a 2nd clutch had 1st nests terminated...

Sopuck, L.; Zwickel, F., 1983: Renesting in adult and yearling blue grouse Dendragapus obscurus, Canada. Canadian journal of zoology = Journal canadien de zoologie2(5-6): 289-291

Hannon, SJ.; Simard, BR.; Zwickel, FC.; Bendell, JF., 1979: Differences in the gonadal cycles of adult and yearling blue grouse. Gonadal cycles of adult and yearling female and male blue grouse (D. o. fuliginosus) collected from Vancouver Island, British Columbia Canada , are described and compared. Reproductive organs of yearling females develop later, produce eggs at a lo...

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Zwickel F.C., 1983: Factors affecting the return of young blue grouse dendragapus obscurus fuliginosus to breeding range. From 1969-1976, 1958 juvenile blue grouse, D. o. fuliginosus, were marked with patagial wing tags and/or leg bands in east-central Vancouver Island [British Columbia, Canada]. Return and/or recovery records from these birds in their 2nd yr or grea...

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