نتایج جستجو برای: breeding seasons
تعداد نتایج: 80998 فیلتر نتایج به سال:
Odorrana ishikawae is listed as a class IB endangered species in the IUCN Red List and is protected by law in both Okinawa and Kagoshima Prefectures, Japan. Here, in an effort to help effectively preserve the genetic diversity of this endangered species in the laboratory, we tested a farming technique involving the artificial breeding of frogs, and also promoted natural breeding in the laborato...
abstract the aim of this study was to evaluate the monthly variations of triiodothyronine (t3), thyroxine (t4), t3 tot4 ratio, thyroid stimulating hormone (tsh), and testosterone in dallagh rams during the breeding and non breeding seasons. four healthy mature rams (3-4 years old) with an average body weight of 45±5 kg were selected and kept in the same conditions. blood samples were collected ...
Background Migrants have been hypothesised to use different migration strategies between seasons: a time-minimization strategy during their pre-breeding migration towards the breeding grounds and an energy-minimization strategy during their post-breeding migration towards the wintering grounds. Besides season, we propose body size as a key factor in shaping migratory behaviour. Specifically, gi...
Breeding periodicity allows organisms to synchronise breeding attempts with the most favourable ecological conditions under which to raise offspring. For most animal species, ecological conditions vary seasonally and usually impose an annual breeding schedule on their populations; sub-annual breeding schedules will be rare. We use a 16-year dataset of breeding attempts by a tropical seabird, th...
B ETWEEN 1938 and 1949 seven different unrelated inbred lines of Duroc swine were developed by the Oklahoma Agricultural Experiment Station in cooperation with the Regional Swine Breeding Laboratory. In sixteen of the twenty-two farrowing seasons from the spring of 1939 through the fall of 1949, both inbred and two-line-cross litters were produced. In some seasons outbred Duroc and three-linecr...
Avian species richness and abundance were studied in order to characterize the bird fauna of Twin Cays, Belize. Auditory and visual surveys were conducted for both migratory and resident species during winter and summer seasons. The Mangrove Yellow Warbler was the most common bird species on the islands in both seasons, with an estimated mean density of 13.4 birdsha during the winter and 10.9 b...
The seasons in the 1 year study were classified as rainy, transitional rainy-dry, dry, and transitional dry-rainy. Semen pH and the consistency of the testes did not vary between seasons or among rams. All other characteristics of semen and testis varied between rams. Significant seasonal differences were observed for ejaculate volume, mass, % motility, forward motility score and concentration ...
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