Portal de Revistas Académicas UC Temuco
Not a member yet
1040 research outputs found
Sort by
Is the zooplankton of mesosaline lakes in protected areas in the semiarid Pampa of Argentina different from those in lakes with high anthropic influence?
No full textMost of the mesosaline lakes in the semiarid central Pampas have a high anthropic influence. The objective was to determine the limnological and zooplankton parameters of a mesosaline lake with little human impact, the West Lake of the Parque Luro Reserve, and compare it with previously studied aquatic ecosystems. Monthly samples were taken (2014–2015). The mean depth and salinity were 0.66 m and 29.33 g/L, respectively. The transparency was high and favored the growth of the macrophyte Ruppia cirrhosa. Zooplankton diversity was low, with autochthonous halophilic crustaceans (Daphnia menucoensis and Boeckella poopoensis). Zooplankton density was 20 to 100 times lower than that of other pampean lakes, probably due to the presence of the macrophyte, which distinguishes this lake from others in the region
Economic Importance and Widespread of Ectoparasites Infestation in Indigenous Chickens (Gallus gallus domesticus). A Study from Selected Local Government Councils and States in Nigeria
Get PDFA cross sectional study was conducted from June 2016 to August 2017 to identify the widespread of ectoparasites in indigenous chickens and its associated economic significance in randomly selected Local Government Councils and States in Nigeria. A total of 1025 indigenous chickens were examined out of which 90.7% were infested with one or more ectoparasites species. Four types of ectoparasites genera were encountered in this study, 17.0% of the total chickens examined were infested with only one genera while 73.9% were infested with two or more different genera. Among the ectoparasites encountered, lice infestation (85.8%) was the most prevalent followed by mite (70.4%), Flea (27.3%) and tick (6.2%) in descending order of widespread. Ten different species of ectoparasites, namely Menopon gallinae, Lipeurus caponis, Goniodes gigas, Cnemidocoptes mutans, Dermanyssus gallinae, Epidermoptes species, Laminosioptes cysticola, Megninia species, Echidnophaga gallinacean and Argas persicus were identified in the study. Menopon gallinae (50%) was most frequently encountered while Megninia species (2.7%) was least prevalent. The findings of this study showed that ectoparasites infestations were highly prevalent among indigenous chicken flocks, which may likely affect their optimum productivity. Routine prevention and control of ectoparasites should be encouraged in the study areas.Key Words: Indigenous chickens, ectoparasites, infestations, selected local government councils and states in Nigeria
Investigation of charcoal production in Makurdi and Guma local government areas of Benue state, Nigeria.
No full textEconomic adversity, scarcity, joblessness and upsurge in the price of oil have dictated the need for people to find alternative means of making a living in respect of domestic cooking energy in Nigeria. Therefore, this work examined charcoal production in both Makurdi and Guma LGAs of Benue state to ascertain its impact, contributions to rural livelihood and efforts in replanting trees felled for charcoal production. Villages involved in charcoal production were identified using snowball sampling techniques. A Multi-stage Sampling Technique was employed to select respondents for data collection as personal interview and semi-structured questionnaire were used. Twelve villages were selected purposively from four Council Wards out of eleven in Makurdi LGA, while six villages were selected from two Council Wards out of ten were ten in Guma LGA. Three charcoal producers and marketers were selected in each village for administration of questionnaire. Results revealed that males (85.4%, 83.7%) were higher than females (14.6%, 16.3%) in Makurdi and Guma LGAs, respectively. Youths between ages of 21-30 years (27.1% and 32.6%) in Makudri and Guma with highest level of secondary education were foremost in the business. Prosopis africana was the most preferred tree species for charcoal production in the area. Despite fewer number of Council Wards chosen in Guma LGA, yet, respondents felled as much as 132 trees per week for charcoal production against 109 trees felled in Makurdi LGA which sum up to 241 trees felled per week. The results also reveal that on weekly bases, 22 charcoal producers in Makurdi earned N25,000, while 18 in Guma LGA earned between N11, 000 - N15, 000 from charcoal business. The result further revealed that, respondents met family needs as feeding, paying school fees and purchase of motorcycle. The major health hazard encountered by respondents in Makurdi and Guma LGAs was fire burn (50% and 25%), respectively. Efforts in replanting trees in the study area was minimal through plantation forestry and agroforestry. In conclusion, charcoal production was observed to improve socio economic benefits to people. However, alternative source of livelihood should be provided for the people to mitigate the adverse effect of deforestation.Key words: Charcoal, deforestation, livelihood, Prosopis africana, wood species, Key words: Charcoal, deforestation, livelihood, Prosopis africana, wood species
Public awareness of zoonotic diseases and public health implications in Makurdi Metropolis, Benue State, Nigeria.
Get PDFThis study was conducted with the objectives of assessing the level of awareness on zoonotic diseases among residents of Makurdi Metropolis. Questionnaire was structured into 3 sections namely, socio- demographic characteristics of residents, Awareness on domestic animals, and wild animals transmission of zoonotic diseases. Simple and systematic random sampling was used to select sample locations in which a total of 250 questionnaires were administered; Descriptive statistics, Students t-test and chi-square analysis were used to analyzed data. Field result showed that 144 respondents male were interviewed while 106 respondents were female. Residents of Makurdi Metropolis were quite aware of zoonotic diseases in both domestic and wild animals. The commonest domestic animal zoonotic diseases known to residents were: the Mad Dog disease, Bird Flu and Swain Flu. While the commonest wild animal zoonotic diseases known to residents were: Monkey Pox disease, Ebola disease, and Lassa fever, the awareness of residents on these zoonotic diseases could be associated with the recent outbreak of these diseases and in the area . It was therefore recommended that more awareness campaigns on other types of zoonotic diseases and they preventive measures should be given to residents of Makurdi metropolis to forestall future public health hazards.Keywords: Makurdi metropolis, zoonotic diseases transmission, Awareness, domestic and wild animals
Sustainability of Guinea Fowl (Numidia meleagris) layers fed varying levels of Centrosema pubescent leaf meal.
Get PDFAn experiment was conducted to determine the effect of egg size on hatchability of Guinea fowl keets. Three different egg size groups (treatments): small (<39 g); medium (39 - 42 g) and large (>42 g)] were used in the experiment. Each treatment had three replicates of 10 eggs each. A complete randomized design was used for the experiment. Eggs were incubated with their sharp ends pointing downwards at 37.5 - 37.8oC and 60% relative humidity for 28 days. Thereafter, incubation parameters including hatchability (number of eggs that successfully hatched), dead in shells (DIS), clears, pips and keets with deformities evaluated. Data were analyzed using General Linear Model (GLM) of SAS. Medium sized eggs had significantly (P<0.05) higher hatchability than small eggs. Also, medium sized eggs had lower pips. Egg size did not have effect on DIS, clears and deformities. The results of the present study showed that medium sized eggs (39 - 42 g) hatched best in comparison to both small and large categories. Keywords: Dead in shells, deformities, egg size, guinea fowl, hatchability, incubatio
Effects of cassava and yam peel meals on carcass traits and economics of production of finishing broilers.
Get PDFA four week study was conducted using 180 four weeks-old Abor acre broilers to determine the carcass traits and economics of production of finishing broilers fed cassava and yam peel meals as partial replacement for maize. They were randomly assigned to three treatment groups of 60 birds each. Each treatment group was replicated three times with twenty birds constituting a replicate. The three treatment groups were fed the three experimental diets in a completely randomized design (CRD) for 28 days. Feed and water were provided ad libitum for the period. Proximate composition results revealed that cassava and yam peel meals are rich in energy and minerals. Birds on diets T1 and T3 had similar (p > 0.05) final live and de-feathered weights, which were higher (p<0.05) than those on diet T2. Birds on diet T2 and T3 had the lower (p < 0.05) carcass weight than the birds on diet T1. There were no significant (p > 0.05) differences in the cut parts and organ weights, but there were significant differences in the dressing percentage of the birds across the treatments. Revenue generated per bird was influenced (p < 0.05) with T3 birds having better income. It was concluded that sun-dried yam peel meal can replace 20 percent maize in the finishing broiler diet without adverse effects on performance and at reduced cost of productionKeywords: poultry, agro waste, unconventional feedstuffs, production traits, roots and tuber
Infección por Herpesvirus equino tipo 1 y tipo 4: revisión y actualización.
Get PDFLos Herpesvirus Equino tipo 1 (VHE-1) y Herpesvirus Equino tipo 4 (VHE-4) son patógenos que están ampliamente distribuidos en las poblaciones de equinos de todo el mundo, considerándose dentro de los agentes más importantes debido a las consecuencias devastadoras que producen a la industria equina. Las enfermedades producidas por estos virus se denominan comúnmente como Rinoneumonitis Equina (RNE) ya que ambos tienen la capacidad de producir enfermedad respiratoria, sin embargo, el VHE-1 también puede causar abortos en los últimos meses de gestación, muerte en neonatos o disfunción neurológica; por otra parte, el VHE-4 raramente puede ocasionar abortos.Luego de la infección primaria por VHE-1 o VHE-4, estos tienden a entrar en un estado de latencia viral, en la cual los animales infectados se encuentran aparentemente sanos, pudiendo posteriormente reactivarse frente a situaciones de estrés. Dichos mecanismos permiten la supervivencia y propagación de estos virus a otros caballos susceptibles.VHE-1 y VHE-4 son enzoóticos en muchos países del mundo, en especial en los que se mantienen grandes poblaciones de caballos, por lo que es primordial realizar un diagnóstico oportuno y certero, además de conocer las estrategias de prevención y control que existen a escala mundial y nacional. La presente revisión bibliográfica busca otorgar información actualizada referente a la infección por VHE-1 y VHE-4 y dar a conocer la importancia de la prevención de la infección por estos patógenos.Palabras clave: Infección, Herpesvirus Equino tipo 1, Herpesvirus Equino tipo 4
Forest conservation activities in Mount Brackett (Sacred Forest) in South West Mau forest, Kenya.
Get PDFThe study investigated forest conservation activities in Mt. Bracket (sacred forest) in South West Mau Forest. South West Mau Forest if found within central coordinates of 35° 38. 88ˈE and 0° 33. 00ˈS and an altitude of 1800 – 3000 m above sea level. Mt. Brackett was purposively chosen for study due to its religious and cultural benefits. Three transects were laid at 0-2 Km, 2-5 Km and over 5 Km parallel to the edge of forest and one study site selected from each transect. 225 household questionnaires were administered during the data collection by randomly identifying the first household (HH) in each study site and there after systematically selecting a HH after every third HH at an approximate distance of 300 m. The data was analyzed using SPSS Version 12 package at significant test levels of P < 0.05. Sensitization on forest conservation (57.3%), research and policing (59.7%) and tree planting (64.0%) were the main forest conservation activities in the area. Chi-square test demonstrated that there was no significant association (P > 0.05) between forest conservation activities in Mt. Brackett forest and the study sites in all the transects. The paper recommends that households adjacent to forests need to be sensitized and educated on forest conservation especially through Community Forest Associations (CFAs)
Agenciamientos en las sociedades de control
Get PDFThis paper approaches the main thesis behind Deleuze andGuattari´s theory about the rise of social formations of control and their assemblages[agencements]. To achieve such aim, three theses on mutation ofcontemporary capitalism will be presented. Firstly, this study focuses on thetransformations of power relations and knowledge formation. Secondly, attentionis turned to understanding the changes in modes of subjectivation (fromsocial subjection to machinic enslavement). Thirdly, the paper will explore thenew regimes of images and signs of our contemporary societies. However, noneof these transformations can be understood, for deleuzoguattarian critical socialtheory, without reference to the concrete assemblages [agencements] inwhich they take place. For this reason, on the one hand, this article will analyzesome examples of ubiquitous computations that illustrate the dimensions ofthe new modulation strategies (codification) of contemporary power. On theother hand, this study will explore the mass media assemblages that assure newforms of reterritorialization by artificial means (territorialization) and, finally,it will focus on the possible lines of flight of social formation of control.El objetivo de este artículo es presentar las principales tesis detrás de la teoría de Gilles Deleuze y Félix Guattari sobre la aparición de las formaciones sociales de control y sobre los agenciamientos que a ellas corresponden. Así, se recorrerán tres tesis fundamentales sobre la mutación del capitalismo contemporáneo. En el primer apartado se abordarán las transformaciones en las relaciones de poder y en las formaciones de saber. En el segundo, nos detendremos en los cambios en los modos de subjetivación (de la sujeción social a la esclavitud maquínica). Por último, exploraremos los nuevos regímenes de imágenes y de signos que nuestros autores hicieron corresponder con las sociedades contemporáneas. No obstante, ninguna de estas transformaciones es legible, para la teoría social crítica deleuzoguattariana, sin los agenciamientos concretos en los que tienen lugar. Por ello abordaremos algunos ejemplos de componendas de la computación ubicua que ilustrarán las dimensiones de las nuevas vías de modulación (codificación) del poder contemporáneo y de agenciamientos massmediáticos que aseguran formas novedosas de reterritorializaciones por medios artificiales (territorialización). Hacia el final nos detendremos en el dato primario de toda formación social, sus posibles líneas de fuga
Hacia una ontología del escuchar. Fundamento del diálogo intercultural
Get PDFFrom a metaphysical, perspectivistic and a rational vital point of view, this paper intends to analyze the “listening”, extracting from it applicable consequences to the dialogue and to intercultural practices with the aim of making a theoretical contribution about the art of listening. This contribution seeks a liberating change in the human dialogue and a rescue of attitudes and positive listening characteristics among several wisdoms tending to overcome the hegemonic occidental philosophical - theological euro centrism.Desde una mirada metafísica perspectivista y raciovitalista se pretende hacer un análisis del “escuchar” extrayendo de ello consecuencias aplicables al diálogo y a las prácticas interculturales, con el objetivo de realizar un aporte teórico sobre el arte de escuchar para que se efectúe un cambio liberador en el diálogo humano y un rescate de actitudes y características positivas de escuchas entre diversas sabidurías, tendiente a superar el eurocentrismo filosófico – teológico occidental hegemónic