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Search Results: 1 - 10 of 18416 matches for " Paula Marques;Cassoli "
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Valida o de modelos de predi o de nitrogênio uréico no leite, estimando-se o consumo individual pelo consumo do rebanho = Validation of models to predict milk urea nitrogen concentrations, using herd intake to estimate individual dry matter intake
Paula Marques Meyer,Paulo Fernando Machado,Arlei Coldebella,Laerte Dagher Cassoli
Acta Scientiarum : Animal Sciences , 2006,
Abstract: O objetivo deste trabalho foi validar modelos de predi o de nitrogênio uréico no leite (NUL), visando contribuir para avalia o nutricional de dietas de vacas. Foram utilizadas 8.833 observa es de vacas holandesas de um rebanho comercial. A produ o de leite, o pesovivo, o número de dias em lacta o e o número de lacta es foram coletados no dia da amostragem do leite. Amostras de leite foram coletadas mensalmente para determina o da sua composi o. Para a avalia o dos 3 modelos, foram medidas acurácia, precis o e robustez. O modelo 3, apesar de mais acurado (viés=-0,21 mg/dL), foi menos preciso (erro residual=5,24 mg/dL) que o modelo 2 (viés=-1,72 e erro residual=4,90 mg/dL), enquanto o modelo 1 foi o menos acurado (viés=2,93 mg/dL) e o menos preciso (erro residual=5,99 mg/dL). Houve falta de robustez para os 3 modelos. Os três modelos de predi o de NUL diferiram entre si quanto à acurácia, precis o e robustez. The objective of this study was to validate prediction models for milk urea nitrogen (MUN), aiming at evaluating utilization efficiency of diets for dairy cows. Data (8,833 observations) from Holstein cows were used. Milk production, body weight, days in milk and lactation number were collected on the milk sampling days. Milk samples were collected monthly for composition analysis. In order to evaluate the three models, accuracy, precision and robustness were tested. Despite being more accurate (mean bias=-0.21 mg/dL), model 3 was less precise (residual error=5.24 mg/dL) than model 2 (mean bias=-1.72 and residual error=4.90 mg/dL), while model 1 was the least accurate (mean bias=2.93 mg/dL) and the least precise (residual error=5.99 mg/dL). There was lack of robustness for the three models. Models for predicting MUN differ among themselves with regard to accuracy, precision and robustness.
Validation of models for predicting milk urea nitrogen concentrations, estimating dry matter intake by the NRC (2001)
Meyer, Paula Marques;Machado, Paulo Fernando;Coldebella, Arlei;Cassoli, Laerte Dagher;Coelho, Karyne Oliveira;Rodrigues, Paulo Henrique Mazza;
Revista Brasileira de Zootecnia , 2012, DOI: 10.1590/S1516-35982012000500026
Abstract: the objective of this study was to validate three different models for predicting milk urea nitrogen using field conditions, attempting to evaluate the nutritional adequacy diets for dairy cows and prediction of nitrogen excreted to the environment. observations (4,749) from 855 cows were used. milk yield, body weight (bw), days in milk and parity were recorded on the milk sampling days. milk was sampled monthly, for analysis of milk urea nitrogen (mun), fat, protein, lactose and total solids concentration and somatic cells count. individual dry matter intake was estimated using the nrc (2001). the three models studied were derived from a first one to predict urinary nitrogen (un). model 1 was mun = un/12.54, model 2 was mun = un/17.6 and model 3 was mun = un/(0.0259 × bw), adjusted by body weight effect. to evaluate models, they were tested for accuracy, precision and robustness. despite being more accurate (mean bias = 0.94 mg/dl), model 2 was less precise (residual error = 4.50 mg/dl) than model 3 (mean bias = 1.41 and residual error = 4.11 mg/dl), while model 1 was the least accurate (mean bias = 6.94 mg/dl) and the least precise (residual error = 5.40 mg/dl). they were not robust, because they were influenced by almost all the variables studied. the three models for predicting milk urea nitrogen were different with respect to accuracy, precision and robustness.
Fatores n?o-nutricionais e concentra??o de nitrogênio uréico no leite de vacas da ra?a Holandesa
Meyer, Paula Marques;Machado, Paulo Fernando;Coldebella, Arlei;Cassoli, Laerte Dagher;Coelho, Karyne Oliveira;Rodrigues, Paulo Henrique Mazza;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000400024
Abstract: the objective of this study was to evaluate the association of non-dietary factors on the concentration of milk urea nitrogen (mun), as an indicator of efficiency of nutrient utilization by lactating dairy cows. a dataset containing 7,006 observations from 855 lactating holstein cows were used. milk yield, body weight, days in milk and number of lactation were collected on the milk sampling days. monthly samples of milk were collected to determine contents of milk fat, protein, lactose, total solids, mun and somatic cells count (scc). yield of milk components (fat, protein, lactose and total solids) as well as 4% fat-corrected milk (fcm) were also used in the study. regression analyses of mun, as the dependent variable, on fcm, scc and content and yield of milk components were done to analyze the data. mean mun and milk yield averaged 13.3 mg/dl and 35.8 kg/day, respectively. milk contents of fat, protein, lactose and total solids as well as scc (natural logarithm transformed) were negatively associated with mun while the opposite was observed for yields of milk lactose and total solids and milk production. yields of milk fat and milk protein (kg), fcm, days in milk and number of lactation all were correlated with mun, however there was lack of fit for the linear equation. no significant correlations between mun and body weight and mun and fat:protein ratio were observed. among the non-dietary factors, milk yield and milk protein concentration correlated most with mun.
Contagem de células somáticas e produ??o de leite em vacas holandesas de alta produ??o
Coldebella, Arlei;Machado, Paulo Fernando;Demétrio, Clarice Garcia Borges;Ribeiro Júnior, Paulo Justiniano;Corassin, Carlos Humberto;Meyer, Paula Marques;Cassoli, Laerte Dagher;
Pesquisa Agropecuária Brasileira , 2003, DOI: 10.1590/S0100-204X2003001200012
Abstract: the goal of this paper was to evaluate if losses in milk yield due to increase in somatic cells count are proportional or independent of the level of production. a total of 7,756 observations, monthly collected from a single herd from september/2000 up to june/2002, were used. the lactation curve was modeled by the incomplete gamma function, considering the effects of lactation order, calving season, peripartum disorder incidence and body condition score at calving. somatic cells count was added to the model as a multiplicative factor, representing relative losses, and as an additive factor, representing absolute losses. the best model was chosen based on the information criteria of schwarz (bic). the losses are absolute, becoming evident from 14,270 cells/ml, and they are 184 and 869 g/day for each increase of one unit in the natural logarithm scale, starting from that somatic cells count, for primiparous and multiparous cows, respectively.
Contagem de células somáticas e produ??o de leite em vacas holandesas confinadas
Coldebella, Arlei;Machado, Paulo Fernando;Demétrio, Clarice Garcia Borges;Ribeiro Júnior, Paulo Justiniano;Meyer, Paula Marques;Corassin, Carlos Humberto;Cassoli, Laerte Dagher;
Revista Brasileira de Zootecnia , 2004, DOI: 10.1590/S1516-35982004000300011
Abstract: the relationship between milk somatic cells count (scc) and milk yield has been the aim of countless researches in several countries; however, in brazil, the literature related to this subject is scarce. therefore, the objective of this study is to verify if the losses in milk yield due to scc increase are proportional to the yield, or absolute (independent of it) and starting from which scc, the losses become evident. for this study, 13.725 observations were used, collected monthly from 6 different herds, from january/2001 up to june/2002. the analysis model, for lactation curve, was based upon the incomplete gama function, considering the effects of lactation order, herd and calving season. the scc entered in that model in two ways: as multiplicative factor (representing relative losses) and as addictive factor (representing absolute losses). the best model was chosen based on the information criteria of schwarz (bic). it is concluded that the losses are absolute, becoming evident from 17.000 cells/ml, and they are 238 and 868 ml/day for each increase of one unit in the natural logarithm scale, starting from that scc, respectively, for primiparous and multiparous.
"Novas" legitimidades de segmenta??o do mercado de trabalho de jovens diplomados
Marques,Ana Paula;
Revista Portuguesa de Educa??o , 2009,
Abstract: today as before, the dialectics of work and employment expresses profound contrasts. in this context, employability - understood as the probability both of accessing and staying in the labour market - plays with multiple aspects, which are not only linked with the individual and professional qualifications of those who look for a job, but also assume collective and unequal dimensions. the latter refers namely to the local inflexions of the macro-economical context within which the search for a job takes place, the human resource management strategies that companies resort to, and higher education as well as employment and training policies. in this article, based on the main results of diagnoses focusing on graduates and human resource managers, we will highlight the effects of the flexibility strategies adopted by companies considering the following dimensions: productive, training, functional, compensation, work schedule and type of contract. the "new" legitimacies that section these young executives are growingly based on the non-regulation of work relations and of the entrepreneurship policies adopted by most companies, exposing to a growing precariousness social groups that have invested on professional and academic formation, particularly in higher education. as a result, youngsters are confronted with the challenge of acepting uncertainty and using it as a real asset for action, that is, of gaining a certain identity (in)stability that may provide a sense of plausible biographic temporality. this includes internalising a culture of entrepreneurship and creative initiative resting on a high degree of transferability of the value of academic qualifications and of competencies and cultural orientations of superior technical-scientific training.
Mercados profissionais e (di)vis es identitárias de jovens engenheiros
Ana Paula Marques
Revista da Faculdade de Letras : Sociologia , 2004,
Abstract: The text here presented gets back to the guidelines of some of the reflections derived from a research that was carried through a selected group of young graduates in Engineering. Here we intend to: i) highlight some of the processes of change related with the patterns of professional insertion of young graduates; ii) identify the factors underlying the segmentation of the professional markets and its effects on the increasing internal differentiation of this professional group and its effects on the criteria of identity classification and distinction mobilized by the youth in the beginning of a career; iii) contribute for the knowledge on the changes occurring on the representations and the meanings constructed around the diploma, the job and the profession.
"Novas" legitimidades de segmenta o do mercado de trabalho de jovens diplomados
Ana Paula Marques
Revista Portuguesa de Educa??o , 2009,
Abstract: Today as before, the dialectics of work and employment expresses profound contrasts. In this context, employability - understood as the probability both of accessing and staying in the labour market - plays with multiple aspects, which are not only linked with the individual and professional qualifications of those who look for a job, but also assume collective and unequal dimensions. The latter refers namely to the local inflexions of the macro-economical context within which the search for a job takes place, the human resource management strategies that companies resort to, and higher education as well as employment and training policies. In this article, based on the main results of diagnoses focusing on graduates and human resource managers, we will highlight the effects of the flexibility strategies adopted by companies considering the following dimensions: productive, training, functional, compensation, work schedule and type of contract. The "new" legitimacies that section these young executives are growingly based on the non-regulation of work relations and of the entrepreneurship policies adopted by most companies, exposing to a growing precariousness social groups that have invested on professional and academic formation, particularly in higher education. As a result, youngsters are confronted with the challenge of acepting uncertainty and using it as a real asset for action, that is, of gaining a certain identity (in)stability that may provide a sense of plausible biographic temporality. This includes internalising a culture of entrepreneurship and creative initiative resting on a high degree of transferability of the value of academic qualifications and of competencies and cultural orientations of superior technical-scientific training.
Análise do desempenho motor em tarefas de "timing" antecipatório em idosos praticantes de esportes de intercepta??o
Cantieri, Francys Paula;Marques, Inara;
Revista Brasileira de Educa??o Física e Esporte , 2012, DOI: 10.1590/S1807-55092012000200013
Abstract: the aim of this study was to analyze the effect of interception sports on the performance in of a complex anticipatory timing task in the elderly. the study included 73 participants divided into three groups: elderly athletes, elderly and young non-athletes. the task consisted in the execution of a sequence of touchs in four sensors, simultaneously to the lighting of diodes aligned in a groove, with the last touch matching the lighting of the last diode. we used three speeds of diode lighting (1 m/s, 1.5 m/s, 2.2 m/s), with ten trials for each speed. the performance was analyzed by calculating the constant error, variable error and absolute error. the results indicated positive effect of sports on the anticipatory timing performance in elderly athletes. there was also the effect of varying the speed of the stimulus, with the best performances of the groups at moderate speed.
Aglaenita (Hemiptera: Cicadellidae: Neocoelidiinae): a new species from Brazil
Marques-Costa, Ana Paula;
Zoologia (Curitiba) , 2011, DOI: 10.1590/S1984-46702011000100017
Abstract: aglaenita spinola, 1850 comprises fourteen species, all occurring in brazil, including a new species, a. hambletoni sp. nov., which is described herein. the genus is close to biza walker, 1858 and megacoelidia kramer & linnavuori, 1959. aglaenita hambletoni sp. nov. can be distinguished from other aglaenita species mainly by the characters of male genitalia, especially by the pygofer bearing an apical bifurcated process, the branches of the process pointed and sclerotized, the upper branch longer than the lower, tooth-like one; and by the aedeagus without processes and with the ventral margin without teeth. the diagnosis of the genus and the known geographical distribution of its species are also given
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