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Animal mortality

About: Animal mortality is a research topic. Over the lifetime, 526 publications have been published within this topic receiving 14887 citations.


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Journal ArticleDOI
TL;DR: A disease outbreak among juvenile cobia farmed in cages in the state of Rio de Janeiro, Brazil, caused by the dinoflagellate Amyloodinium ocellatum and the monogenean Neobenedenia melleni was reported.
Abstract: This study reports a disease outbreak among juvenile cobia (Rachycentron canadum) farmed in cages in the state of Rio de Janeiro, Brazil, caused by the dinoflagellate Amyloodinium ocellatum and the monogenean Neobenedenia melleni. Two thousand five hundred fish were stocked at 0.4 kg/m3 in a set of 12 m3 tanks, in autumn (mean weight 15.0 ± 7.3 g) and in winter (mean weight 43.0 ± 5.6 g). Freshwater baths were administered as a routine treatment, as the symptoms were detected followed by two collection samples. Firstly in May 2011 (n = 5) and secondly in September 2011 (n = 10). In the first sample, the prevalence of N. melleni on the body surface was 100% and the mean intensity was 42.0 ± 1.7, while in the second sample the prevalence was 60% with a mean intensity 3.0 ± 0.2 and mean abundance 1.8 ± 0.4. Amyloodinium ocellatum was only found in the second sample, at a prevalence 100% and mean intensity 46.8 ± 3.4. The cause of fish mortality was possibly associated with a decrease in fish resistance after the first contact with monogenean parasites, allied with respiratory difficulty caused by the presence of A. ocellatum in the gills.

9 citations

Journal Article
TL;DR: An empiric expression relating the radiation dose rate and quality (LET) to the expected biologic effect is presented, anticipating the possible application of these data to clinical situations.
Abstract: Radiation-induced immunosuppression was studied with special emphasis on the factors of dose rate and quality of the radiation. Fission neutrons, x-rays, and 60 Co γ-rays at dose rates ranging from 2.8 to 95 rads/min were tested for their biologic effect. Data reported earlier from our laboratory were supplemented as necessary to allow intercomparisons to be made. The biologic systems in the mouse included: a) animal mortality, b) immune response capability of the irradiated animal, and c) antibody formation by irradiated spleen cells cultured in unresponsive hosts. The following empiric relationships were established: a) the three biologic responses were each related to the radiation dose by a probit-type analysis, b) the magnitude of the dose-rate effect was an exponential function of the linear energy transfer (LET), and c) the inverse cube root dose-rate relationship reported earlier was confirmed. Immunosuppression of the whole animal was related to mortality, but not in a simple manner: as the LET of the radiation used declined, the level of immunosuppression at the LD 50 increased, indicating that mortality is not necessarily a measure of the level of immune activity. We present an empiric expression relating the radiation dose rate and quality (LET) to the expected biologic effect, anticipating the possible application of these data to clinical situations.

8 citations

Journal ArticleDOI
TL;DR: In this paper, the authors examined the relationship between pro-biodiversity attitudes, participation in a voluntary stewardship program, and engagement in biodiversity-friendly farming activities among farmers in Nova Scotia, Canada.
Abstract: Biodiversity and farming are inextricably linked. Naturally occurring biodiversity supports the ecosystem services that are indispensable for agricultural production. Although the intensification of farming during the twentieth century has resulted in increased yields, this has often been at the expense of biodiversity. At present, farm biodiversity conservation efforts are largely confined to voluntary programs. This research project examined the relationship between pro-biodiversity attitudes, participation in a voluntary stewardship program, and engagement in biodiversity-friendly farming activities among farmers in Nova Scotia, Canada. This investigation was completed through a quantitative survey measuring respondents’ attitudes toward, knowledge of, and management of biodiversity. Significant links were found between program participation and increased engagement in two out of six biodiversity-friendly activities the program promotes: (1) modified harvest, such as changes to mowing equipment, timing, pattern or height to reduce animal mortality; and (2) riparian management, such as buffers and fencing. Engagement in other practices could not be traced to program participation. Pro-biodiversity attitudes, however, were linked to some of these other activities, but not linked to the increased uptake of riparian management or modified harvest. The instruction given to participants about riparian and harvest activities was much more detailed and site-specific than instructions for the activities that were linked to pro-biodiversity attitude, however. This suggests that the quantity and quality of instruction provided to stewardship program participants may have an impact on their uptake of conservation activities.

8 citations

Journal ArticleDOI
TL;DR: Results suggest an inhibition of some key metabolic enzymes resulting from accumulation of the insecticide components in the tissues following exposure to Raid in a nonoccupational environment.
Abstract: Toxicity and bioaccumulation of the insecticide "Raid" was determined to assess total animal dietary exposures in a nonoccupational environment. The study focused primarily on dietary exposure concentrations (25-960 microg/g) of the ingredients of Raid administered to rats for 10 days. Tissue concentrations of the insecticide were determined by a high-pressure liquid chromatography method, whereas established methods were used to assess the tissue levels of glucose-6-phosphate and lactic acid dehydrogenase. Results show that animal mortality progressively increased with increasing concentrations while growth (in weight) decreased. Bioaccumulation of the insecticide in the tissues was in the order of lipid > muscle > liver > brain. The indices of toxicity showed no significant effect in brain, but significant reduction of glucose-6-phosphatase and lactic acid dehydrogenase levels were observed in muscle and liver. These results suggest an inhibition of some key metabolic enzymes resulting from accumulation of the insecticide components in the tissues.

8 citations

Journal ArticleDOI
TL;DR: Rec recombinant gE produced in baculovirus-infected insect cells is a viable source of antigen for the detection of SHV-1 in ELISA tests and is used to develop a local indirect ELISA test with sensitivity and specificity comparable to currently available commercial tests.

8 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202129
202025
201924
201822
201724
201620