130 research outputs found
Studies on Aggressive Behavior in Mice
It is important to elucidate aggressive behavior for effective domestic animal management. Aggressiveness in mice, our model domestic animal, is partly caused by genetic factors. It has not, however, been studied in detail. The present study was designed to produce high and low aggression, inbreeding coefficient changes, and reproductive performance by selection. In addition, we investigated the effects of different population sizes on aggression, and also intracerebral dynamic neurotransmitters. Genetically different, high(H) and low(L) aggression mice were produces by selection. Our estimated values of heritability and realized heritability of aggression indicated that aggresiveness is influenced mainly by the environment. Inbreeding coefficients in H and L mice showed an increase of about 2% per generation, and 68.2 and 67.1% in the 34th generation of selection. Reproductive performance decreased slightly during selection, induced by the increase in inbreading coefficients. Isolated H mice induced the highest aggressiveness, without inducing aggressive behavior in isolated L mice. This result indicates that there is a genetic difference in the aggression control system between H and L mice. The serotonin turnover rate is reduced further in H mice than in L mice before the aggression test, suggesting that the serotonergic system is related to aggressive behavior. There were significant differences in dopamine levels between H and L mice. Results obtained from autoreceptor agonists indicate that H mice exhibit a high dopamine biosynthesis and release rate, while H and L mice differ in their aggression auto-control system through autoreceptors in the presynapse. H and L mice exhibit different aggressive behavior changes due to concentrations of dopamine D1 receptors.家çã®ç®¡çã«ããã£ãŠãæ»æè¡åã®è§£æã¯éèŠãªèª²é¡ã§ããã家çã®ã¢ãã«åç©ã§ããããŠã¹ã§ã¯ãæ»ææ§ãçºçŸãããèŠå ã®1ã€ã«éºäŒçèŠå ãæããããããååãªè§£æããªãããŠããªããããã§ãæ¬ç 究ã¯ãããŠã¹ã®æ»ææ§ã«ã€ããŠéžæè²çš®ãè¡ããæ»ææ§ã®éºäŒçãæšå®ãããšãšãã«ãéžæäžä»£ã«äŒŽãè¿äº€ä¿æ°ãšçç£èœåã®æšç§»ã«ã€ããŠæ€èšããã€ãã«æ»ææ§ã«åãŒã飌è²å¯åºŠã®åœ±é¿ã«ã€ããŠæ€èšãããããã«æ»ææ§ã«é¢äžãããšã¿ãããè³å
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Selection Effect on Survival Time of Japanese Quail under High and Low Temperature Stresses
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Influence of Environmental Temperature on Growth of Japanese Quails
Up to date, any precise reports on crystalline lutein, which was comprised at about 20% in carotenoids of green leaves and at about 40% in these xanthophylls, have not been found. In previous report, the authors showed that the glycocarotenoids containing galactose were existent in spinach leaves, and in the processes of these carotenoids purification lutein was found to be crystallized easily from cold acetone in considerably good yields. This crystalline lutein had mp. 174-176â, and E1cm 1% of 2344 at 446 nm. Furthermore, visible absorption spectrum, IR-spectrum, NMR-spectrum and Mass spectrum were also estimated for the identification of it
Influence of Environmental Temperature on Various Organ Weights on Japanese Quail Chicks
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Application of Fuzzy Sets to Synthetic Evaluation of Beef Quality in Japanese Black Cattle, Dairy Cattle and F1 Hybrids
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The Survey on the Actual Conditions of Raising and Utilization of Goat in Nagano Prefecture
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Genetic Variation of Survival Time of Japanese Quail under High and Low Ambient Temperatures
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Genetic Analysis the of Registered Japanese Black Cattle in Okayama Prefecture : I. The Rate of Genetie Contribution and Inbreeding Coefficient
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