MODIFIED SEXUAL PHOTOPERIODICITY IN COTTONTAIL RABBITS
نویسندگان
چکیده
منابع مشابه
Enzootic transmission of Anaplasma bovis in Nantucket cottontail rabbits.
Serological studies of cottontail rabbits sampled from Nantucket Island, Mass., have suggested exposure to at least two ehrlichiae. The agent of human granulocytic ehrlichiosis (Anaplasma phagocytophilum) is intensely enzootic in rabbits there, but the identity of the other ehrlichial infection remains undescribed. We sampled rabbits over five transmission seasons and tested their blood and tis...
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Free-ranging cottontail rabbits (Sylvilagus floridanus) from two areas in central Pennsylvania were sampled over a 4-year period. Large numbers of coliforms were isolated from the intestinal tracts of these animals; in 136 of the 141 rabbits sampled, Escherichia coli was found to be a major component of the alimentary flora. Four serogroups (O7, O77, O73, and O103) were predominant among the is...
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The virus content of naturally occurring and experimentally induced papillomas of cottontail rabbits varies considerably. As a rule different individual papillomas on the same rabbit were found to have a similar virus content. The amount of virus usually increased as the tumors aged from 6 to 12 weeks. After 12 weeks there was no consistent pattern of change in virus con tent of papillomas, and...
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An enzyme-linked immunosorbent assay was developed to detect antibodies to Borrelia burgdorferi in cottontail rabbits captured in Millbrook, N.Y., and New York, N.Y. Five antigenically variable strains of B. burgdorferi were analyzed to determine the variability of serologic test results. In analyses of 79 serum samples, seropositivity ranged from 56% for a strain cultured from kidney tissues o...
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Previous work has shown (Bissonnette, 1932) that added electric light after dusk has a pronounced stimulatory influence on the anterior pituitary (Hill & Parkes, 1933), causing the onset of oestrus in the ferret during the non-breeding season of the year from September to March. Marshall (1940) also showed that the time of the onset of the breeding season caused by exposure to light varied with...
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ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 1939
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1537645