geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Reproduction of the norway rat rattus norvegicus in the animal husbandry premises in north kazakh ssr ussr


, : Reproduction of the norway rat rattus norvegicus in the animal husbandry premises in north kazakh ssr ussr. Zoologicheskii Zhurnal 60(4): 587-594

It was established (1967-1979) that Norway rats reproduced throughout the year with a high intensity which changed markedly with respect to seasons. In spring (from March) a peak of reproduction is observed and in fall and winter the intensity of reproduction decreases. During the spring-summer period the percentage of pregnant females increases and embryonic mortality decreases 2 x as compared to winter; the mean number of embryos suffers slight changes. With increase of female weight, the portion of pregnant females, mean size of brood and frequency of embryonic resorption also increase. Intensity of reproduction is inversely dependent and embryonic mortality is directly dependent on population density.

US$29.90


Other references

Qiu Zhaozhi; Zhang Runsheng; L.Q.nkui, 1984: The digenetic trematodes of brown frog (Rana temporaria chensinensis). Allocreadium ranae n.sp. from R. t. chensinensis from Inner Mongolia, China, is described and figured. It is characterized by the oral sucker being larger than the acetabulum, the acetabulum being in the middle of the anterior half of the body, th...

Hahnen, Kevin, 2000: Trocar introducer system and methods of use. A trocar introducer system having a trocar slideably inserted into a lumen of a cannula. The trocar has an elongate member which comprises a proximal end and a distal end. An actuating mechanism is mounted at the proximal end of the trocar and ope...

Kalman, E.; Wald, B., 1957: Serological changes after irradiation of malignant tumors. Antigen was prepared from the nucleoprotein fraction of tumor tissue of people, or of rats with Guerin carcinoma. Serum from some patients and rats was tested before and after X-ray or radium therapy. Serum from some irradiated rats with and witho...

Ugajin, T.; Miyatani, H.; Watanabe, Y.; Nishida, J.; Yoshida, Y., 2008: Pictures in clinical medicine. Perforated amebic huge liver abscess successfully treated with metronidazole. Internal Medicine 47(9): 879-880

Sinha, D.; Joshi, N.; Chittoor, B.; Samji, P.; D'Silva, P., 2010: Role of Magmas in protein transport and human mitochondria biogenesis. Magmas, a conserved mammalian protein essential for eukaryotic development, is overexpressed in prostate carcinomas and cells exposed to granulocyte-macrophage colony-stimulating factor (GM-CSF). Reduced Magmas expression resulted in decreased pro...

Philippe, F., 2004: Quelle methode d'angiographie pour predire le risque coronaire en 2003? Aspects reglementaires et pratiques de l'utilisation de la coronarographie, de FIRM et de l'angioscanner. In 2003, risk stratification in coronary heart disease is routinely performed by the results of coronary angiogram, the invasive gold standard angiography. Combined with the left ventricular ejection fraction assessment, the classification in one,...

Zeissler, H., 1981: Eine interresante Mischfauna in einem Aufschluss des Weimarer Lolozanen Travertins. Malakologische Abhandlungen Dresden 7(3): 47-52

Hartmann, W., 1953: Clinical studies on diethylaminoethanol, a cleavage product of novocaine. Medizinische Monatsschrift 7(4): 243-8; Contd

Naplekova, Nn, 1975: Cellulose-decomposing microorganisms--producers of gibberellin and gibberellin-like substances. Obrazovanie fiziologicheski aktivnykh veshchestv mikroorganizmami I L Klevenskaia ed: 4-100

Yamasu, T., 1968: Anatomy and histology of a bivalved gastropod, Julia japonica. Biological Journal of Okayama University, 14(1-2): 35-53