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Search Results: 1 - 10 of 37357 matches for " Pereira Alfredo Ribeiro "
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Doramectin e levamizole no controle dos helmintos de bovinos no início da esta??o seca
Oliveira, Gilson Pereira de;Freitas, Alfredo Ribeiro de;
Ciência Rural , 1998, DOI: 10.1590/S0103-84781998000200016
Abstract: sixty cattle from canchim breed with 15 months were mantained in a bracharia decumbens stapf pasture were randomly alloted into three balanced treatments designed to the control of gastro-intestinal nematodes (t1: control group; t2: 1ml/50kg bw of doramectin, corresponding to 200mg/kg; and t3: levamizole 1ml/40kg bw, equivalent to 3,75 mg of the active principle per kg of body weight). the administration was proceeded through the parenteral via, subcutaneously and the verminotic infeccion took place naturally. the experiment was carried out at the canchim farm, head office of the animal prodution research center of embrapa (cppse) located in s?o carlos, s?o paulo state, brazil, from april/95 to june/95. it has been determined body weight, eggs per gram (epg) and mean corpuscular volume (mcv), over six periods (p) as follows: 0, 14, 28, 42, 56 and 70 days after drug administration. the mathematical model for statistical analysis included effects of treatment (t) and period, as well t x p interaction. from day 14 on, doramectin presented the least epg (p<0.01) compared to other treatments, which showed no difference (p>0.05) between each other from day 42 on. treated animals showed similar weight gains (p>0.05) up to day 42. control group animals had a reduction in the weight gain (p<0.05), which was negative (loss of weight) at 42 and 70 days. in concern to mcv, treated animals were similar (p>0.05) over the experimental period. in the other hand, control group showed lower calves (p<0.05) since day 28.
Comportamento da Haematobia irritans em fazendas com diferentes manejos de bovinos
Oliveira, Gilson Pereira de;Freitas, Alfredo Ribeiro de;
Ciência Rural , 1997, DOI: 10.1590/S0103-84781997000200018
Abstract: haematobia irritans parasitical dynamics was studied in three farms rearing crossbred beef cattle, under different management systems, in the region of s?o carlos, s?o paulo state. in the farms was not utilized any specific treatment against horn flies. the experiment consisted in counting fortnightly the number of flies on the dorso-lombar area of the animals, from october, 1992 to october, 1994. each farm used a different parasite control: t1- ribeir?o bonito farm, anthihelminthic treatment, with injectable levamizole (ripercol l); ticks treated with pour on pyrethroid compound (ectoplus); and berne, treated with trichlorphon (neguvon) plus used motor oil, applied topically; t2- s?o carlos farm, antihelminthic treatmen with injectable levamizole (ripercol l); ticks treated with formamidine (triatox) in immersion bath; and berne treated with pour on fenthion (tiguvon); and t3- santa eudóxia farm, no parasitism treatments. the number of horn flies (mc) was analised in the scale √(mc + 0,5) in a statistical model that included, besides the mean, the effects of treatments, year, month, period and the double interactions. in the scale mc, all the effects differed from each other (p < 0.01). during the months in which the temperature was higher (october to march) average parasite load was of 15.7±36.4 flies, while temperature was lower (april to august) it was of 6.8 ± 23.6 flies. the average parasite load differed (p < 0.01) among years (92 = 4.8 ± 7.8; 93 = 8.8 ± 20.0; 94 = 16.6 ± 43.8) and among farms (t1= 3.1 ± 9.7; t2= 2.2 ± 13.7 e t3=26.0 ± 44.5), indicating that horn fly behaviour is irregular and noncyclic. the efficiency of 81.1% and 86.3% was observed for treatment t1 and t2, respectivelly, when compared to treatment t3.
Composi??o do leite de tanques de rebanhos brasileiros distribuídos segundo sua contagem de células somáticas
Machado, Paulo Fernando;Pereira, Alfredo Ribeiro;Sarríes, Gabriel Adrian;
Revista Brasileira de Zootecnia , 2000, DOI: 10.1590/S1516-35982000000600038
Abstract: a survey on the somatic cell count (scc), fat, protein, lactose and total solids percentages on bulk tank milk samples, from december 1996to july 1998, was used to characterize the milk composition as determined by scc. data of 4785 from the database were classified according to the scc, in four groups (group 1, scc < 500 thousand cells/ml; group 2, 500 < scc < 1.000 thousand cells/ml; group 3, 1.000 < scc < 1.500 thousand cells/ml; group 4, scc > 1.500 thousand cells/ml). a descriptive statistics, analysis of variance and multiple mean tests were applied to the groups. increases on the group classes were associated with increases on concentration and standard deviation and decreases on protein and lactose concentrations. despite of the no significance, the total solids tended to decrease as group classes increase. the bulk tank milk samples with higher scc had greater fat percentages, lower protein and lactose percentages and the same total solids percentages. the significant changes in the milk component contents occur above 1.000.000 cells/ml for fat and 500 thousand cells/ml for protein and lactose. bulk tank groups with greater scc have greater variability in milk component compositions.
Contagem de células somáticas e características produtivas de vacas da ra?a holandesa em lacta??o
Pereira, Alfredo Ribeiro;Machado, Paulo Fernando;Sarríes, Gabriel Adrian;
Scientia Agricola , 2001, DOI: 10.1590/S0103-90162001000400001
Abstract: subclinical mastitis results in the decrease of milk and fat production. this disease is detected using somatic cell counts. the objective of this study was to quantify the relation of somatic cell levels, transformed into linear score (ls), and the production of milk and fat during 305 days of lactation, peak milk production, and the lactation duration time of holstein cattle. data were gathered concerning 147 closed lactations of holstein cows (83 primiparous and 64 multiparous) from a confined herd in the state of s?o paulo, brazil. statistical analyses were performed through the general linear model procedure. the productive characteristics of multiparous, but not primiparous cows, were affected acording to the linear score. an increase in the average linear score during lactation resulted in the decrease of fat and milk production in the 305 days of lactation. the increase in the average linear score at the beginning of the lactation period resulted in a decrease of milk production at the peak of lactation.
Composi o do leite de tanques de rebanhos brasileiros distribuídos segundo sua contagem de células somáticas
Machado Paulo Fernando,Pereira Alfredo Ribeiro,Sarríes Gabriel Adrian
Revista Brasileira de Zootecnia , 2000,
Abstract: Foi realizado um levantamento dos dados de contagem de células somáticas (CCS), porcentagens de gordura, proteína, lactose e sólidos totais de amostras de leite de tanques recebidas no período de dezembro de 1996 a julho de 1998, com o objetivo de se caracterizar a composi o do leite segundo sua contagem de células somáticas. Os 4785 dados de análise foram classificados segundo sua CCS, sendo formados quatro grupos (grupo 1, CCS < 500 mil cél./mL; grupo 2, 500 < CCS < 1000 mil cél./mL; grupo 3, 1000 < CCS < 1500 mil cél./mL; grupo 4, CCS > 1.500 mil cél./mL). Aos grupos foram aplicadass técnicas de estatística descritiva, análise de variancia e compara es múltiplas de médias. O aumento da ordem das classes acarretou acréscimo da porcentagem de gordura e dos desvios-padr o e redu o nas porcentagens de proteína e lactose. A concentra o de sólidos totais, apesar de n o-significativa, apresentou tendência de redu o. Concluiu-se que leite de tanques com CCS mais altas apresentaram maior porcentagem de gordura, menor porcentagem de proteína e lactose e igual porcentagem de sólido totais. As mudan as significativas nas concentra es do componentes do leite ocorrem a partir de 1.000.000 cél./mL para gordura e 500 mil cél./mL para proteína e lactose. Grupos de tanques com maiores CCS apresentaram maior variabilidade nas concentra es dos constituintes do leite.
Mapeamento da cobertura da terra dos Parques Estaduais do Jalap o (PEJ), Cant o (PEC) e município de Itaguatins (Tocantins) / Land cover mapping in state parks Jalap o, Cant o and municipality Itaguatins (Tocantins)
Anderson Ribeiro Santiago,Alfredo da Costa Pereira Júnior
Ambiência , 2010,
Abstract: O estado do Tocantins n o possui um programa de monitoramento continuo de sua cobertura vegetal, o que levou a formaliza o de um convenio entre o Ministério de Ciência e Tecnologia, por meio do Instituto Nacional de Pesquisas Espaciais, e o Instituto Natureza do Tocantins, com o intuito de solucionar esta problemática. Para isso, foram adquiridas cenas do sensor TM/Landsat-5, referentes ao período de estiagem de 2007, abrangendo os Parques Estaduais do Jalap o (PEJ), Cant o (PEC) e o município de Itaguatins, sendo georreferenciadas, convertidas as imagens-fra o, segmentadas e classificadas. Identificaram-se as classes: área urbana, agropecuária, bancos de areia, capoeira, campo limpo e sujo, cerrado sentido restrito denso e/ou típico, cerrado sentido restrito ralo e/ou rupestre, corpos hídricos, deposi o de areia, floresta estacional semidecidual aluvial, floresta estacional semidecidual submontana, mata ciliar, mata-de-galeria, pecuária e vereda. Os índices de Exatid o Total / Kappa para o PEJ, PEC e Itaguatins foram de 78,38% / 0,72; 86,67% / 0,69 e 84,62% / 0,81; respectivamente. Estes dados confirmam a eficiência da metodologia aplicada, podendo ser implementada em um programa de monitoramento da cobertura vegetal do Estado.AbstractTocantins state does not have a program of continuous monitoring of its vegetation. This situation leaded to a formal agreement between the Ministry of Science and Technology, through the National Institute of Space Research and the Nature Institute of Tocantins, with the aim at solving the problem of monitoring vegetation. Hence, scenes were acquired from the sensor TM/Landsat-5, during the period of droughts in 2007, covering the state parks Jalap o (PEJ), Cant o (PEC) and the municipality of Itaguatins. Those data were geographically referred, converted into images-fraction, segmented and classified. Classes were, then, identified as: urban, agriculture, sand banks, secondary vegetation, grassland cerrado, woodland cerrado, wooded cerrado, water bodies, sand deposition, alluvial forest, submontane forest, riparian forest, gallery forest, cattle rising and moist grassland. Indices of Total Accuracy / Kappa for PEJ, PEC and Itaguatins were 78,38% / 0,72; 86,67% / 0,69 and 84,62% / 0,81, respectively. These data confirm the efficiency of the methodology applied, which can be implemented in a program for monitoring the vegetation of the state.
Contagem de células somáticas e características produtivas de vacas da ra a holandesa em lacta o
Pereira Alfredo Ribeiro,Machado Paulo Fernando,Sarríes Gabriel Adrian
Scientia Agricola , 2001,
Abstract: A mastite subclínica, diagnosticada através da contagem de células somáticas, afeta negativamente a pecuária leiteira diminuindo a produ o de leite e de gordura. Este estudo foi realizado com o objetivo de se quantificar o efeito do nível de células somáticas, transformado para escore linear (EL), sobre a produ o de leite e gordura em 305 dias de lacta o, produ o de leite no pico e dura o da lacta o de bovinos da ra a holandesa. Foram levantadas informa es referentes a 147 lacta es encerradas de vacas da ra a holandesa (83 primíparas e 64 multíparas), de um rebanho confinado do Estado de S o Paulo. As análises estatísticas foram realizadas utilizando-se o procedimento de modelo lineares generalizados. Contrariando a literatura, as características produtivas dos animais primíparos n o sofreram efeito do escore linear. Provavelmente este fato ocorreu devido a quase inexistência de animais primíparos com EL maior que 4,5. O aumento do escore linear médio durante a lacta o levou a diminui o da produ o de leite e gordura em 305 dias de lacta o. O aumento do escore linear médio durante o início da lacta o levou a diminui o da produ o de leite no pico da lacta o.
Nitrogênio e potássio na produtividade e qualidade da bananeira cultivar Thap Maeo
Moreira, Ad?nis;Pereira, José Clério Rezende;Freitas, Alfredo Ribeiro de;
Bragantia , 2009, DOI: 10.1590/S0006-87052009000200023
Abstract: the experiment was carried out in a xanthic ferralsol (dystrophic yellow latosol) of central amazon with the objective to verify the effect of nitrogen and potassium rates on yield and quality of banana cultivar thap maeo (triploid - aab). the experimental design was factorial randomized blocks (3x4), with the following treatments: three n rates (0, 267 and 534 kg per ha cycle - source: urea) and four k2o rates (200, 800, 1600 and 2400 kg per ha cycle - source: potassium chloride), with three replicates and two cycles of harvest. the results showed that n and k rates did not affect the diameter of fruits, acidity and total soluble solids. after the first cycle, regardless of n rates, the application of k2o rates reduced the resistance of pulp. banana yield reduced with increased n rates. in the second cycle, k2o rates showed significant interaction with n, and the largest yield was obtained with application of 1600 kg ha-1 of k2o.
Anatomy of pneumatophore of Mauritia vinifera mart
Pereira, Luiz Alfredo Rodrigues;Calbo, Maria Elisa Ribeiro;Ferreira, Claiton Juvenir;
Brazilian Archives of Biology and Technology , 2000, DOI: 10.1590/S1516-89132000000300013
Abstract: pneumatophores of mauritia vinifera mart. were collected from six month-old plants maintained submerged in fresh water to induce pneumatophore formation. twenty day-old pneumatophores had a quite prominent root cap. the epidermis was composed of hexagonal cells, tangentially distributed along the cylindric surface of the organ. in transverse section these pneumatophores had a simple epidermis over several layers of sclerified parenchyma, which covered an aerenchyma with large intercellular spaces. the endodermal cells had casparian strips. the vascular cylinder was polyarch, with a pith and surrounded by a unisseriate pericycle. anatomically the 4 month-old pneumatophores were similar to the younger ones, except for the absence of the epidermis. the epidermis is replaced by a protective tissue, whose lignified and suberized cells projected themselves outwards, giving it a filamentous aspect. there was no accumulation of starch or tannins in the pneumatophores, except for the presence of statoliths in the root cap. no lenticels were observed in pneumatophores of m. vinifera. the main function of the pneumatophores of m. vinifera is to allow gas exchange, facilitating the supply of oxygen to the submerged root portions.
Células somáticas no leite em rebanhos brasileiros
Machado, Paulo Fernando;Pereira, Alfredo Ribeiro;Silva, Luís Felipe Prada e;Sarriés, Gabriel Adrian;
Scientia Agricola , 2000, DOI: 10.1590/S0103-90162000000200026
Abstract: a survey of data of the lactation physiology laboratory of esalq - usp, piracicaba, sp, brazil was performed to characterize the somatic cell count (scc) of herds. descriptive statistics was used to analyze results of 7941 records collected between december 1996 and july 1998. the scc mean was 641 thousand cells ml-1, standart deviation 767 thousand cells ml-1. the log2 transformation was also applied to scc values, a new mean was calculated and then again transformed into scc (307 thousand cells ml-1). this was the best way to present the real scc values of the herds. the population of herds are distributed according to scc count, considering the scc limits of 250, 500, 750, 1000, 1250 e 1500 thousand cells ml-1, in the following percentages: 26, 53, 71, 83, 89, 93%. the quartiles of the samples were 25, 50, 75, 90, 95, 99 e 100% showing 244, 468, 815, 1302, 1797, 4099, 9223 thousand cells ml-1 respectively.
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