Results 211 to 220 of about 42,084 (252)
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Maternal pheromone in Rattus norvegicus
Behavioral and Neural Biology, 1983A replication was undertaken of the finding that rat pups between 14 and 28 days of age will approach an attractant (maternal pheromone) contained in the excrement of lactating female rats. Preweaning pups from three strains of Rattus norvegicus (hooded PVG/C, Wistar, and Sprague-Dawley) were tested under different apparatus conditions, with different ...
F, Clegg, D I, Williams
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Rhythmicity in the maternal behaviour of Rattus norvegicus
Animal Behaviour, 1970Abstract Using a dual-chambered maternity cage the time that a lactating rat spent with its litter was recorded continuously from birth of the litter until weaning. Under a 12-hr light-dark regimen there was a precise 24-hr rhythm in maternal behaviour; the greatest amount of time with the litter occurring during the middle of the light period and ...
R, Ader, L J, Grota
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Palatability of bird repellents to Rattus norvegicus
Pest Management Science, 2001AbstractThe palatability to captive, mostly laboratory‐bred, Norway rats (Rattus norvegicus) of cereal‐based baits containing 0.02 g kg−1 brodifacoum, with and without bird‐repellent additives, was compared in a no‐choice experimental design. Methyl anthranilate (25 g kg−1), dimethyl anthranilate (25 g kg−1) and cinnamamide (2.5 g kg−1) reduced bait ...
E B, Spurr, R E, Porter, C, Thomson
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Leptospirosis and other infections ofRattus rattusandRattus norvegicus
New Zealand Veterinary Journal, 1980Abstract A survey was carried out over 16 months to determine the leptospiral status of rats in urban and rural Waikato. One hundred and sixty rats, 112 urban and 48 rural, were examined for leptospiral infection and also for the presence of other bacterial pathogens, dermatophytes, encephalomyocarditis (EMC) virus, and ecto- and endoparasites.
M E, Carter, D O, Cordes
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Ultrasound as a deterrent to Rattus norvegicus
Journal of Stored Products Research, 1977Abstract Acoustical outputs were determined for five ultrasonic generators, claimed by the manufacturers to be effective in driving rodents from buildings; wide variation of frequencies, amplitudes, duty cycles, and pulse rates were found. Two contrasting types of generators were selected for field testing.
G. Keith Lavoie, J.F. Glahn
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1967
The second largest autosome has satellites. Two types of X have been described within strains. It may have prominent short arms or none. The Y is polymorphic among strains, acrocentric and the smallest element with positive heteropyknosis or, equal in size to medium-sized autosomal acrocentrics without heteropyknosis.
T. C. Hsu, Kurt Benirschke
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The second largest autosome has satellites. Two types of X have been described within strains. It may have prominent short arms or none. The Y is polymorphic among strains, acrocentric and the smallest element with positive heteropyknosis or, equal in size to medium-sized autosomal acrocentrics without heteropyknosis.
T. C. Hsu, Kurt Benirschke
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Paracrystalline Hæmoglobin as a Species Difference between Rattus norvegicus and Rattus rattus
Nature, 1961THE common laboratory white rat is almost always the albino variety of the Norway rat (brown rat, Rattus norvegicus)1,2 and only exceptionally the albino variety of the black rat (Rattus rattus)3. The two species are morphologically similar, which makes it rather difficult to distinguish them.
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Leptospirosis in Rattus norvegicus and Rattus rattus in Israel.
Israel journal of medical sciences, 1982Leptospires were isolated from 21.2% of Rattus norvegicus (the brown rat) and 9.9% of Rattus rattus trapped in a survey of urban and rural areas in Israel. Microagglutination antibodies were found in sera of 9.4 and 8.1% of these rats, respectively. The 191 strains isolated belonged to six serogroups: Leptospira icterohaemorrhagiae (169), L.
I, Lindenbaum, E, Eylan
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Defensive behaviors of laboratory and wild Rattus norvegicus..
Journal of Comparative Psychology, 1986Analysis of the defensive behaviors of wild rats to an inescapable approaching threat stimulus (the experimenter) indicated a pattern of freezing to distant stimuli, giving way to vocalization, jumps, and jump-attacks at shorter defensive distances. Comparisons of the defensive reactions of wild-trapped and laboratory-bred wild rats to a variety of ...
R J, Blanchard +2 more
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2023
Morpho-physiological peculiarities are discussed for Rattus norvegicus Berk. of two populations living under different ecological conditions. Difference in the habitat conditions is shown to result in differentiation of the populations in a number of indices: weight and length of the body, its proportions, relative weight of the viscera, fecundity and ...
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Morpho-physiological peculiarities are discussed for Rattus norvegicus Berk. of two populations living under different ecological conditions. Difference in the habitat conditions is shown to result in differentiation of the populations in a number of indices: weight and length of the body, its proportions, relative weight of the viscera, fecundity and ...
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