Interação competitiva do zinco e ferro após administração oral e venosa de zinco em crianças eutróficas

The aim of this study was to assess the acute and chronic effects of zinc in serum iron profile of children aged 6-9 years in relation to nutritional status and dietary intake. The study participants were 11 children regardless of sex, aged 6-9 years. They were selected from three public schools of the city of Natal, Brazil. Body mass index was used to assess nutritional status. In order to determine the patterns of childhood growth and ideal weight we used the standards of the World Health Organization. The dietary intake assessment was based on information from a three-day prospective food survey. The variables were energy intake, protein, lipids, carbohydrates, fiber, calcium, iron and zinc. All children underwent an intravenous administration of zinc (IVAZn) before and after oral administration of zinc (OAZn) (5 mg Zn / day) for three months. We measured serum iron, hematocrit, hemoglobin and total protein, before and after the use of oral zinc. The analysis of hematocrit, hemoglobin and total protein was performed using standard methods of clinical laboratory. Zinc levels and serum iron were measured by atomic absorption spectrophotometry. The project was evaluated and approved by the Ethics in Research Committee of Federal University of Rio Grande do Norte. Results: All children had normal weight. The consumption of energy, fat, fiber, calcium and iron were below recommended levels. However, the levels of protein and carbohydrates were high. Protein and zinc increased significantly after OAZn. Carbohydrate and protein were elevated in the blood. After OAZn, both protein and zinc increased, being statistically significant. Conclusion: The potential inhibitory effect of physiological or pharmacological doses of zinc on the profile of serum iron was observed in children with healthy weight and aged between 6 and 9 years. This negative effect of zinc did not affect the levels of hematocrit or hemoglobin, and therefore did not cause anemia. This was a multidisciplinary study, involving researchers from medicine, nutrition and pharmacy. This met the requirements of multidisciplinarity of the Post Graduate Program in Health Sciences of Federal University of Rio Grande do Norte.

Associação entre fatores nutricionais e a resposta frente à infecção por Leishmania chagasi

Leishmania chagasi infection presents a wide spectrum of clinical outcomes, ranging from asymptomatic self resolving infection to disease, visceral leishmaniasis (VL). The exact mechanisms that lead the evolution of infection to disease are not understood. It is believed that malnutrition is a risk factor associated with VL development, although there are few human studies in the area. We aimed to assess the nutritional factors associated with the response to L. chagasi infection in Rio Grande do Norte. The study was conducted from December 2006 to January 2008. 149 children were assessed: 20 active VL cases, 33 children with VL history, 40 DTH+ asymptomatic children and 56 DTH-. Nutritional status was assessed using z scores for Weight/Age, Weight/Height, Height/Age, Body Mass Index (BMI), and mid-upper arm circumference/height (MUAC/height). Vitamin A status was determined by serum retinol concentrations and the modified-relative-dose-esponse test (MRDR). Breastfeeding time and birth weight were also evaluated. VL children presented compromised nutritional status when compared to the other groups using BMI and MUAC/age, with means -1,53 ± 1,10 and -1,48 ± 1,28 z scores, respectively (ANOVA, p < 0,05). VL children also showed lower vitamin A levels: 43% presented serum retinol < 20 µg/dL and 15% MRDR > 0,060. Birth weight was inverserly associated with the risk to belong the VL group (β = -0,00; OR = 0,84; 95% CI 0,73 - 0,99; p = 0,047), whereas more breastfeeding time was directly associated with the risk to belong to the DTH+ group (β = 0,02; OD = 1,16; 95% CI 1,01 - 1,33; p = 0,036). The nutritional variables evaluated were associated with the response to the L. chagasi infection, with malnutrition and compromised vitamin A status as markers of children who present with VL. Higher birth weight was associated with protection to disease, and higher breastfeeding time was associated with increased likelihood of an asymptomatic infection. The results show that modifiable nutritional aspects in the study population are associated with the response to the L. chagasi infection

Síndrome metabólica e risco cardiovascular na pós- menopausa: avaliação por diferentes critérios diagnósticos e influência de fatores sócio-econômicos

The metabolic syndrome (MetS) involves a group of risk factors and is associated with a significantly higher risk of developing cardiovascular diseases (CVD) and type 2 diabetes. Recent studies have shown the importance of preventing CVD through early diagnosis and treatment of patients with MetS. The objective of our study was to determine the prevalence of MetS by different diagnostic criteria in postmenopausal women and analyze the influence of socioeconomic factors on cardiovascular risk in this sample of the population. A cross-sectional study involving 127 postmenopausal women (45 to 64 years) from Natal and Mossoró, Brazil. The study was approved by the Research Ethics Committee of the Federal University of Rio Grande do Norte. The experimental protocol consisted of applying structured interview, clinical examination and implementation of dosages blood. The diagnosis of MetS was based on NCEP-ATP III (National Cholesterol Education Program-Adult Treatment Panel III) and IDF (International Diabetes Federation) criteria. The research was accomplished with the participation of an interdisciplinary team in their several phases. The result of the sample studied had mean age of 53.9 ± 4.6 years and per capita income of 54.5 dollars. The prevalence of MetS, according to NCEP-ATP III and IDF criteria, was 52.8% and 61.4$, respectively. The agreement rate between NCEP-ATP III and IDF criteria was 81.9%, with a kappa value of 0.63 (CI 95%, 0.49-0.76), indicating good agreement between the two definitions. The most prevalent cardiovascular risk factor was HDL < 50 mg/dl, observed in 96.1% of the women analyzed, followed by increased waist circumference (≥ 80 cm) in 78.0%, elevated blood pressure in 51.2%, triglycerides ≥ 150 mg/dl in 40.9% and glycemia ≥ 100 mg/dl in 37.0% of the women. The occurrence of MetS was significantly associated with schooling and body mass index (BMI). High blood pressure was significantly associated with low family income, low schooling and weight gain. There was no significant association between the intensity of climacteric symptomatology and the occurrence of MetS. The conclusions of the research were that MetS and its individual components show a high prevalence in postmenopausal Brazilian women, and significant associations with weight gain and low socioeconomic indicators. The data point to the need for an interdisciplinary approach at the basic health care level, directed toward the early identification of risk factors and the promotion of cardiovascular health of climacteric women.

Marcadores nutricionais e inflamatórios e sua associação com a morbimortalidade em hemodiálise

Background: Malnutrition, inflammation and comorbidities are frequent in patients with chronic renal failure in hemodialysis (HD), contributing for morbidity and mortality. Aims: To evaluate the correlation between anthropometric, laboratory parameters, bioelectrical impedance (BIA) and inflammatory markers with the morbidity and mortality of patients in HD, as well as the impact of its alterations throughout 12 months. Methods: 143 patients of a dialysis facility in Northeast Brazil were evaluated throughout 18 months. Patients with more than 3 months on dialysis, older than 18 years, without amputation of hands and feet, were included in the study. We performed a clinical (subjective global assessment - SGA), anthropometric (BMI, percent of ideal weight, MAC, MAMC, MAMA, percent of fat mass and TSF), laboratory (albumin, creatinine, lymphocyte count as nutritional markers and CRP, IL-6 and TNF- as inflammatory markers) evaluation and BIA (reactance, phase angle and percent of body cell mass) at the beginning of study and after 3, 6 and 12 months of follow-up. The association between study variables and deaths and hospitalizations in 6 and 12 months was investigated. The variable with significance < 10% in the univariate analysis had been enclosed in a multivariate logistic regression analysis. We also investigated the risk of mortality and hospitalization associated with differences in measurements of the variables at baseline and six months later. Results: Patients were aged 52.2 ± 16.6 years on the average, 58% were male, and mean dialysis vintage was 5.27 ± 5.12 years. The prevalence of malnutrition varied from 7.7-63.6%, according to the nutritional marker. The variables associated with morbidity and mortality in 6 and 12 months had been creatinine ≤ 9.45 mg/dl, phase angle ≤ 4.57 degrees, BMI ≤ 23 kg/m2, age ≤ 64.9 years, reactance ≤ 51.7 ohms; Charlson´s index ≥ 4 and socioeconomic status ≤ 7. During six months of follow up, decrease in albumin was associated with significantly higher mortality risk. Conclusions: This study detected that the best predictors of morbidity and mortality between nutritional and inflammatory markers are phase angle, reactance, creatinine and BMI and that changes in albumin values over six 107 months provide additional prognostic information. The authors believe that parameters of BIA may detect early changes in nutritional status and emphasize that longitudinal studies with larger number of patients are necessary to confirm these data and to recommend BIA as a routine nutritional evaluation in HD patients

Estado nutricional antropométrico, perfil lipídico e consumo alimentar como fatores de risco para doença cardiovascular em adolescentes

The dyslipidemia and excess weight in adolescents, when combined, suggest a progression of risk factors for cardiovascular disease (CVD). Besides these, the dietary habits and lifestyle have also been considered unsuitable impacting the development of chronic diseases. The study objectives were: (1) estimate the prevalence of lipid profile and correlate with body mass index (BMI), waist circumference (WC) and waist / height ratio (WHR) in adolescents, considering the maturation sexual, (2) know the sources of variance in the diet and the number of days needed to estimate the usual diet of adolescents and (3) describe the dietary patterns and lifestyle of adolescents, family history of CVD and age correlates them with the patterns of risk for CVD, adjusted for sexual maturation. A cross-sectional study was performed with 432 adolescents, aged 10-19 years from public schools of the Natal city, Brazil. The dyslipidemias were evaluated considering the lipid profile, the index of I Castelli (TC / HDL) and II (LDL / HDL) and non-HDL cholesterol. Anthropometric indicators were BMI, WC and WHR. The intake of energy, nutrients including fiber, fatty acids and cholesterol was estimated from two 24-hour recalls (24HR). The variables of lipid profile, anthropometric and clinical data were used in the models of Pearson correlation and linear regression, considering the sexual maturation. The variance ratio of the diet was calculated from the component-person variance, determined by analysis of variance (ANOVA). The definition of the number of days to estimate the usual intake of each nutrient was obtained by taking the hypothetical correlation (r) ≥ 0.9, between nutrient intake and the true observed. We used the principal component analysis as a method of extracting factors that 129 accounted for the dependent variables and known cardiovascular risk obtained from the lipid profile, the index for Castelli I and II, non-HDL cholesterol, BMI, and WC the WHR. Dietary patterns and lifestyle were obtained from the independent variables, based on nutrients consumed and physical activity weekly. In the study of principal component analysis (PCA) was investigated associations between the patterns of cardiovascular risk factors in dietary patterns and lifestyle, age and positive family history of CVD, through bivariate and multiple logistic regression adjusted for sexual maturation. The low HDL-C dyslipidemia was most prevalent (50.5%) for adolescents. Significant correlations were observed between hypercholesterolemia and positive family history of CVD (r = 0.19, p <0.01) and hypertriglyceridemia with BMI (r = 0.30, p <0.01), with the CC (r = 0.32, p <0.01) and WHR (r = 0.33, p <0.01). The linear model constructed with sexual maturation, age and BMI explained about 1 to 10.4% of the variation in the lipid profile. The sources of variance between individuals were greater for all nutrients in both sexes. The reasons for variances were  1 for all nutrients were higher in females. The results suggest that to assess the diet of adolescents with greater precision, 2 days would be enough to R24h consumption of energy, carbohydrates, fiber, saturated and monounsaturated fatty acids. In contrast, 3 days would be recommended for protein, lipid, polyunsaturated fatty acids and cholesterol. Two cardiovascular risk factors as have been extracted in the ACP, referring to the dependent variables: the standard lipid profile (HDL-C and non-HDL cholesterol) and "standard anthropometric index (BMI, WC, WHR) with a power explaining 75% of the variance of the original data. The factors are representative of two independent variables led to dietary patterns, "pattern 130 western diet" and "pattern protein diet", and one on the lifestyle, "pattern energy balance". Together, these patterns provide an explanation power of 67%. Made adjustment for sexual maturation in males remained significant variables: the associations between puberty and be pattern anthropometric indicator (OR = 3.32, CI 1.34 to 8.17%), and between family history of CVD and the pattern lipid profile (OR = 2.62, CI 1.20 to 5.72%). In females adolescents, associations were identified between age after the first stage of puberty with anthropometric pattern (OR = 3.59, CI 1.58 to 8.17%) and lipid profile (OR = 0.33, CI 0.15 to 0.75%). Conclusions: The low HDL-C was the most prevalent dyslipidemia independent of sex and nutritional status of adolescents. Hypercholesterolemia was influenced by family history of CVD and sexual maturation, in turn, hypertriglyceridemia was closely associated with anthropometric indicators. The variance between the diets was greater for all nutrients. This fact reflected in a variance ratio less than 1 and consequently in a lower number of days requerid to estimate the usual diet of adolescents considering gender. The two dietary patterns were extracted and the pattern considered unhealthy lifestyle as healthy. The associations were found between the patterns of CVD risk with age and family history of CVD in the studied adolescents

Atividade física na terceira idade: Uma análise de sua contribuições para o estilo de vida através das representações sociais

Temáticas emergentes e estratégicas da política de saúde em nível mundial têm suscitado reflexões para ações sócio educativas com idosos. Esta pesquisa questiona as aspirações desse segmento social face às experiências de qualidade proporcionadas pela atividade física. Objetivo: investigar as representações sociais da atividade física na terceira idade. Método: pesquisa de corte transversal com abordagem quanti-qualitativa. A amostra foi nãoprobabilística e por conveniência apoiada na Teoria das Representações Sociais e a Teoria do Núcleo Central. O estudo foi realizado com alunos de um projeto para a terceira idade com sede no Centro Federal de Educação Tecnológica do Rio Grande do Norte (CEFET), no município de Natal/RN, Brasil. Para a coleta dos dados utilizou-se de questionário semi-estruturado, composto de três partes: A Parte I, para a caracterização social da amostra e identificação da percepção da atividade física para a saúde; a Parte II, com evocação livre de palavras e a Parte III, com uma questão aberta. Análise dos dados: A exploração do material deu-se a partir dos seguintes softs: do SPSS para análise de freqüência simples (parte I); do EVOC (parte II) e do ALCESTE (parte III). Complementarmente, foi utilizada a análise de conteúdo a fim de inferir/corroborar sobre os núcleos de sentido da comunicação. Resultados: O núcleo central da representação foi composto por felicidade/saúde/dança e ginástica, revelando diferentes entendimentos e mostrando também que o conhecimento construído da atividade física assume um papel preponderante na vida de idosos, adquirindo gradativamente, a representação de vida com mais saúde e qualidade na velhice . A composição do núcleo central ao considerar elaborações mentais, emoções, práticas e explicações oriundas do cotidiano que se introduzem na constituição da representação social em foco, poderá influenciar as escolhas e estratégias de se desenvolver melhora nos padrões de saúde e na qualidade de vida dos idosos.

Análise da variabilidade da frequência cardíaca na síndrome dos ovários policísticos

Conselho Nacional de Desenvolvimento Científico e Tecnológico

Atividade física e outros fatores associados à função sexual em mulheres de meia idade

Este estudo teve por objetivo avaliar os fatores associados à disfunção sexual em mulheres de meia idade. Realizou-se um estudo descritivo transversal, que compreendeu 370 mulheres, entre 40 a 65 anos, atendidas nas Unidades Básicas de Saúde de cada distrito sanitário (Norte, Sul, Leste e Oeste) da cidade de Natal, no estado do Rio Grande do Norte, Brasil. Para avaliar a função sexual utilizou-se o Female Sexual Function Index (FSFI). A sintomatologia climatérica foi avaliada por meio do Menopause Rating Scale (MRS). O Índice de Blatt-Kupperman (IMBK) foi utilizado para avaliação quantitativa global da ocorrência de sintomas/queixas. A atividade física foi avaliada pelo questionário International Physical Activity Questionnaire - IPAQ (versão curta). A avaliação da qualidade de vida geral se deu pelo WHOQOL-Bref. A análise estatística foi realizada utilizando o programa estatístico MINITAB version16. Além de análises descritivas das variáveis categorizadas, utilizou-se o teste qui-quadrado de Person com o intuito de verificar possíveis associações entre as variáveis sociodemográficas, comportamentais, clínicas, níveis de atividade física, sintomatologia climatérica, qualidade de vida e a função sexual das mulheres estudadas. Desenvolveu-se a regressão logística para verificar a influência dessas variáveis sobre a disfunção sexual. Considerou-se o nível de significância de 5% para todos os testes. Os resultados mostraram que a média de idade das mulheres estudadas foi de 49,8 (±8,1) anos. Do total dessas mulheres, 67% apresentaram disfunção sexual. Observou-se que 54,5% delas se encontravam na pré-menopausa. Avaliando a influência das variáveis sobre a função sexual; faixa etária (56-65) (p<0,001), estado civil (divorciada/separada) (p < 0,001), escolaridade (baixa) (p=0,017), menopausa (p < 0,001), histerectomia (p = 0,016), nível de atividade física (sedentária) (p=0,002), sintomas do climatério (forte) (p<0,001) e qualidade de vida (baixa) (p<0,001), estiveram associados à disfunção sexual em mulheres de meia idade. Concluiu-se neste estudo que fatores sociodemográficos, clínicos, comportamentais, níveis de atividade física, sintomatologia climatérica e qualidade de vida influenciam significativamente a função sexual na mulher de meia idade

Avaliação gerontológica multidimensional das condições de saúde de idosos residentes em instituições de longa permanência

Introdução/objetivos: A avaliação do estado de saúde de idosos institucionalizados é considerada prática essencial à promoção e recuperação da sua saúde, a qual deve incluir a investigação de aspectos multidimensionais e multidisciplinares relacionados ao envelhecimento saudável. O estudo objetivou avaliar as condições de saúde dos idosos residentes em instituições de longa permanência (ILPI) do município de Natal RN. Métodos: Trata-se de um estudo descritivo, longitudinal, envolvendo seis ILPI filantrópicas, com uma população de 243 idosos. A coleta de dados se deu por meio de entrevistas com os idosos nas instituições mediante a aplicação de um questionário com informações sócio demográficas, saúde e institucionalização, além de várias facetas multidisciplinares que envolvem a escala de avaliação cognitiva (Mini Exame do Estado Mental); o índex de KATZ, para avaliação das atividades da vida diária e uma análise do estado nutricional com questões antropométricas (peso, estatura, circunferência abdominal) e Índice de Massa Corpórea. Participaram do estudo todos os idosos com idade igual ou superior a 60 anos, que aceitaram responder a entrevista e assinaram o Termo de Consentimento Livre e Esclarecido e/ou a impressão datiloscópica. O projeto foi aprovado pelo Comitê de Ética em Pesquisa da Universidade Federal do Rio Grande do Norte, sob parecer n° 164/2011. Resultados: Os participantes do estudo incluem 243 idosos, sendo a maioria mulheres (172 = 70,7%), com média de idade de 79 ± 9,44 anos. 124 idosos são solteiros (51,0%) e 66 viúvos (27,0%). A prática de atividades físicas não é rotina nas instituições, onde a maioria dos idosos (82,7%; n = 201) não realiza nenhum tipo de atividade. 78% dos idosos (n = 192) chegou a instituição sendo levados por familiares, enquanto que apenas 18% (n = 44 idosos) por vontade própria e 4% (n = 7 idosos) não souberam responder. Quanto aos aspectos cognitivos, identificou-se que 64,2% dos idosos (n = 156) apresentaram alterações significativas dentro da pontuação dos escores com restrições em responder aos demais questionamentos durante a entrevista por apresentarem limitações cognitivas e/ou dificuldades senso perceptivas.Conclusão: O presente estudo evidenciou alterações cognitivas na maioria dos idosos institucionalizados impossibilitando-os a continuidade da realização da avaliação global da saúde. A identificação correta da perda cognitiva em idosos é de suma importância para a equipe de saúde a fim de promover a detecção precoce de alterações cognitivas e a adoção de tratamento adequado, no sentido de contribuir para uma melhor qualidade de vida desta população

Zinco Sérico e parâmetros farmacocinéticos na determinação do estado corporal de zinco em crianças

O zinco é um micronutriente fundamental para as funções vitais de qualquer organismo vivo e sua deficiência em humanos pode causar alterações na expressão gênica, crescimento e desenvolvimento infantil, e proteção antioxidante. Devido à sua importância, as concentrações corporais de zinco são estritamente controladas por processos homeostáticos complexos. Este controle reflete no fato da deficiência grave de zinco ser detectada apenas após privação crônica. Embora se estime que a deficiência leve seja comum, os métodos existentes para avaliação individual do estado corporal de zinco são limitados e pouco eficazes. O objetivo deste trabalho foi avaliar o zinco sérico basal e os parâmetros farmacocinéticos na determinação do estado corporal de zinco em crianças, estabelecendo relação entre esses índices. O estudo foi aprovado pelo Comitê de Ética em pesquisa do Hospital Universitário Onofre Lopes (CEP-HUOL) e 129 crianças, eutróficas e aparentemente saudáveis, entre 6 e 9 anos de idade, foram avaliadas antes e após a suplementação oral de zinco (5 mg Zn/dia) durante 3 meses. No início e fim do período houve a administração venosa de zinco (0,06537 mg de Zn/kg de peso) em 40 destas crianças para avaliação dos parâmetros farmacocinéticos por meio de três diferentes fórmulas de clearance de zinco. Os limites do CI (95%) para o zinco sérico basal variaram entre 0,94 1,00 e 0,91 0,98 μg/mL em meninas e meninos, respectivamente. Em relação aos parâmetros farmacocinéticos, a fórmula específica para um compartimento apresentou correlação positiva com o zinco sérico após a suplementação e foi efetiva em detectar mudanças no estado corporal de zinco

Risco de doença cardiovascular em mulheres com história de distúrbio hipertensivo da gravidez

OBJECTIVE: Preeclampsia is a disease that can lead to a high maternal and infant morbidity. Worldwide, the incidence of this disease is highly variable and there is no data on this disorder in the Brazilian population. This study aimed at determining incidence and risk factors in the hypertensive disorders during pregnancy in a neighborhood of Natal, in addition to observing the evolution of these disorders one year and five years after delivery. METHODS: Prospective cohort study to assess the outcome of pregnancies of 242 women who became pregnant between 2004-2007 in the neighborhood of Bom Pastor in the city of Natal, state of RN, Brazil. Five years after delivery, there was an active search of thirty-nine (39) women who became pregnant and had a hypertensive disorder during pregnancy and/or pré-eclâmpsia, out of the total of 242 participants in the initial study. We administered a structured questionnaire to obtain basic information about the current clinical situation of patients and occurrences of subsequent pregnancy and presence of hypertensive disorders during pregnancy. We also searched for information on the use of hypotensive drugs and contraceptives. The following characteristics were checked and recorded: a) current weight, b) blood pressure c) body mass index - BMI, and we collected biological samples (blood and urine) for measurement of biochemical parameters and evaluation of microalbuminúria. Finally, we monitored the ambulatory blood pressure (ABP), which uses the method of automatic measurement of heart rate, systolic and diastolic blood pressure and an average of the two for the period of 24 hours. RESULTS: Out of 218 women who completed the study, the incidence of hypertensive disorders was of 16.9% (37 out of 218), while the incidence of preeclampsia was 13.8% (30 of 218). Women with preeclampsia had a BMI (body mass index) averaged of 25.3 (± 4.8) while this ratio in normotensive women was of 23.5 (± 3.7), p = 0.02. The risk of preeclampsia rises with age (OR 1084 p = 0.0034) and with a family history of hypertension (OR 2.6 p = 0.01). The follow-up one year after delivery revealed that 50% of women with hypertensive disorders in pregnancy remained hypertensive. High BMI was also observed after 5 years of delivery. CONCLUSIONS: an elevated BMI, age above 35 years and excessive weight gain during pregnancy were associated with hypertension in the long term in patients with prior preeclampsia. History of preeclampsia increases the risk of chronic hypertension

Um modelo analítico da qualidade da dieta de adolescentes estudantes da rede publica de ensino de Natal, Brasil

Conselho Nacional de Desenvolvimento Científico e Tecnológico

Influência do método de filetagem e categorias de peso sobre rendimento de carcaça, filé e pele da tilápia do Nilo (Oreochromis niloticus)

The objective of this study was to evaluate the processing methods (F-1 = to remove skin with pliers and then to cut in fillets; F-2 = cut in fillet and then to remove skin with knife and pliers help) and weight categories (W-1=250-300 g; W-2=301-350 g; W-3 = 351-400 g and W-4 = 401-450 g), on the carcass (CY), fillet (FY) and skin yield of Nile tilapia. Forty-eight fishes were used in a completely randomized design. There was effect for the processing method, being the F-1 mean (56.43 and 36.67 %) higher to the F-2 (53.46 and 32.89%) for CY and FY respectively. For the weight categories, W-1 (56.49 and 37.34%) and W-2 (56.34 and 36.40%) were superior as compared to W-3 (53.27 and 31.98%) and W-4 (53.71 and 33.42%), respectively for CY and FY. Crude skin percentage, clean and of fleshed were higher for F-2, but there was no effect for weight categories. The F-1 processing method promoted the best yield and skin results, and for the weight categories W-1 and W-2 higher yields.

Desempenho produtivo de Pseudoplatystoma corruscans estocados em sistemas de criação: semi-intensivo (viveiro escavado) e intensivo (tanque-rede)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Sexagem histológica e desempenho de Oreochromis niloticus testando diâmetros de ração de acordo com o aparato bucal

Estudou-se o tamanho da boca de larvas de tilápia-do-nilo e testou-se o efeito de diferentes granulometrias da ração sobre o ganho de peso, comprimento e sobrevivência das larvas aos 30 e 60 dias de arraçoamento. Avaliou-se também o método de sexagem por meio de microscopia de luz aos 35 dias de idade. A medida da boca das larvas apresentou valores médios de 918,2±152,9μm aos cinco dias de idade. de acordo com esse dado, testaram-se três granulometrias: 0,25, 0,35 e 0,50mm. Aos 30 e aos 60 dias de arraçoamento, 10% das larvas foram medidas, pesadas e contadas para cálculo da taxa de sobrevivência. O tamanho dos grânulos testados não afetou o desempenho das larvas de tilápia nilótica com alimentação iniciada aos cinco dias pós-eclosão. Quanto à sexagem histológica aos 35 dias de idade, as gônadas apresentaram-se, em sua maioria, indiferenciadas. Recomenda-se que essa análise deva ser realizada de acordo com o tamanho dos animais e não com a idade.