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Previous issue date: 2010-02-26 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / The aim of this research was to know serum and liver concentrations of Cu, Mo, Fe and Zn in sheep and goats slaughtered in the semiarid region of the state of Pernambuco, Northeastern Brazil, during the rainy and dry seasons, and to determine if Cu deficiency that occurs in the region is primary or secondary to high levels of Mo and/or Fe. Serum and liver samples from 141 goats and 141 sheep were submitted to wet digestion in nitric-percloric acid and analyzed by coupled plasma atomic absorption spectrophotometry. The mean concentration of serum Cu in sheep was 9.22±2.34 μmol/L in the dry period and 10.03±2.89 μmol/L in the rainy period, but females had significantly higher values (10.92±2.56 μmol/L) than males (9.42±2.67 μmol/L). Mean Cu concentrations in the liver were 185.1±88.28 mg per kg of dry matter (mg/kg) in the dry period and 137.95±87.04 mg/kg in the rainy period, and females had significantly higher concentrations (218.61±93.49 mg/kg) than males (133.45±92.37 mg/kg). In goats serum concentrations of Cu were of 11.74±2.36 μmol/L in the dry period and 11.05±2.74 μmol/L in the rainy period, and females (12.10±2.67 μmol/L) had higher concentrations than males (10.14±1.80 μmol/L). Liver concentrations were 155.2±93.40 mg/kg in the dry period and of 149.37±62.33 mg/kg in the rainy period. Mean serum concentrations of Cu in sheep (9.85±2.71 μmol/L) were significantlyt lower than in goats (11.37±2.57 μmol/L), but there were no differences in liver concentrations of Cu between sheep (158.45±83.05 mg/kg) and goats (152.46±79.58 mg/kg). Based in Cu serum and liver concentrations, and in the sporadic occurrence of enzootic ataxia, Cu suplementation is recommended in grazing sheep and goats during the dry and the rainy seasons. In sheep, serum concentrations of Fe were 36.99±15 μmol/L in the dry season and 34.52±14.86 μmol/L in the rainy season, with significant differences between females (29.92±11.06 μmol/L) and males (37.85±15.68 μmol/L). Liver Fe concentrations were significantly lower in the dry season (186.20±30.02 mg/kg) than in the rainy season (229.25±83.15 mg/kg), with no differences between females and males. In goats, serum concentrations of Fe were 25.61±9.35 μmol/L in the dry season and 24.57±6.96 μmol/L in the rainy season, and liver concentrations were of 170.52±56.91 mg/kg in the dry season and 139.73±51.30 mg/kg in the rainy season; there were no significant differences between females and males. Serum levels of Fe were significantly higher in sheep (35.58±14.89 μmol/L) than in goats (25.06±8.10 μmol/L). Also Fe concentrations of the liver were higher in sheep (210.53±121.99 mg/kg) than in goats (156.1±55.99 mg/kg). Considering that serum and hepatic concentrations of Fe are between normal ranges or marginal it is suggested that the low Cu concentrations are not related with high Fe ingestion. In sheep serum concentrations of Mo were 0.33±0.18 μmol/L in the dry season and 0.3±0.15 μmol/L in the rainy season and liver concentrations were 8.27±3.97 in the dry season and 7.96±4.07 in the rainy season. In goats, serum concentrations of Mo were 0.31±0.12 μmol/L in the dry season and 0.26±0.10 μmol/L in the rainy season, and liver concentrations were 7.17±4.09 mg/kg in the dry season and 5.8±4.14 mg/kg in the rainy season. There were no significant differences in serum and liver Mo concentrations between sheep and goats and between males and females. Despite the variations found in this study and also in reference values, it is suggested that the low or marginal Cu concentrations are not due to high Mo intake. In sheep serum concentrations of Zn were significantly lower during the dry season (9.79±3.02 μmol/L) than in the rainy season (13.48±7.22 μmol/L). Also Zn concentrations in the liver were significantly lower in the dry season (109.96±30.23 mg/kg) than in rainy season (139.1±60.45 mg/kg). In goats, serum Zn concentrations were 12.01±9.61 μmol/L in the dry season and 11.6±4.93 μmol/L in the rainy season, and liver concentrations were 134.2±26.58 mg/kg in the dry season and 131.45±76.55 mg/kg in the rainy season. There were no significant differences between serum and liver concentrations of Zn between sheep and goats or between males and females. Taking into account that serum and liver Zn concentrations in sheep and goats are considered marginal, supplementation with this mineral it suggested in grazing sheep and goats, mainly during the dry season. / Objetivou-se conhecer os teores de Cu, Mo, Fe e Zn em soro e fígado de ovinos e caprinos, nas épocas de chuva e seca, criadas no semi-árido do estado de Pernambuco, e estabelecer se a carência de Cu é causada por deficiência primária de Cu ou secundária à ingestão de quantidades excessivas de Fe ou Mo. Amostras de soro e fígado de 141 ovinos e 141 caprinos foram submetidas à digestão úmida em ácido nítrico-perclórico e analisados em espectrofotômetro de absorção atômica acoplado a plasma. A concentração sérica média de Cu em ovinos foi de 9,22±2,34 μmol/L na seca e 10,03±2,89 μmol/L na chuva, sendo que as fêmeas tiveram valores significativamente maiores (10,92±2,56 μmol/L) do que os machos (9,42±2,67 μmol/L). Os valores de Cu em fígado foram de 185,1±88,28 mg/kg da MS na seca e 137,95±87,04 mg/kg na chuva e as fêmeas tiveram valores significativamente maiores (218,61±93,49 mg/kg) do que os machos (133,45±92,37 mg/kg). Em caprinos os valores séricos de Cu foram de 11,74±2,36 μmol/L na seca e 11,05±2,74 μmol/L na chuva, sendo que as fêmeas tiveram maiores valores (12,10±2,67 μmol/L) que os machos (10,14±1,80 μmol/L). Os teores do fígado foram de 155,2±93,40 mg/kg na seca e 149,37±62,33 mg/kg na chuva. Os teores séricos de cobre em ovinos foram significativamente menores que o dos caprinos, mas não se observaram diferenças nos teores hepáticos de Cu entre ovinos e caprinos. Baseado nesses valores, considerados marginais, e na ocorrência de surtos de ataxia enzoótica em caprinos e ovinos na região, recomenda-se a suplementação com Cu, em animais a campo, tanto na seca quanto na chuva. Os teores séricos de Fe em ovinos foram de 36,99±15 μmol/L na seca e de 34,52±14,86 μmol/L na chuva, diferindo entre fêmeas (29,92±11,06 μmol/L) e machos (37,85±15,68 μmol/L). Os teores do fígado foram significativamente menores na seca (186,20±30,02 mg/kg) do que na chuva (229,25±83,15 mg/kg), não havendo diferenças entre machos e fêmeas. Em caprinos os teores séricos de Fe foram de 25,61±9,35 μmol/L na seca e de 24,57±6,96 μmol/L na chuva e os teores do fígado de 170,52±56,91 mg/kg na seca e de 139,73±51,30 mg/kg na chuva. Nesta espécie não houve diferenças nos teores séricos e hepáticos de Fe entre machos e fêmeas. Os teores séricos e hepáticos de Fe foram significativamente maiores em ovinos do que em caprinos. Considerando que as concentrações séricas e hepáticas de Fe encontram-se dentro da normalidade ou são marginais sugere-se que as concentrações marginais de Cu não estejam diretamente relacionadas com o excesso de Fe. Os teores séricos de Mo em ovinos foram de 0,33±0,18 μmol/L na seca e 0,3±0,15 μmol/L na chuva e os teores no fígado de 8,27±3,97 na seca e 7,96±4,07 na chuva. Os teores séricos de Mo em caprinos foram de 0,31±0,12 μmol/L na seca e de 0,26±0,10 μmol/L na chuva e os do fígado de 7,17±4,09 mg/kg na seca e 5,8±4,14 mg/kg na chuva. Os teores médios de Mo de soro e fígado em ovinos, 0,31±0,17 μmol/L e 8,10±4,01 mg/kg, respectivamente, foram semelhantes aos teores séricos e hepáticos de caprinos, de 0,28±0,11 μmol/L e 6,53±4,13 mg/kg, respectivamente. Tanto em ovinos quanto em caprinos não houve diferenças significantes nos teores do soro e fígado entre machos e fêmeas. Apesar das variações encontradas tanto neste trabalho quanto nos dados da literatura os resultados sugerem que os teores marginais de Cu não são devidos a teores altos de Mo. Em ovinos os valores de Zn no soro foram significativamente diferentes na seca (9,79±3,02 μmol/L) do que na chuva (13,48±7,22 μmol/L). No fígado os valores de Zn foram, também, significativamente diferentes na seca (109,96±30,23 mg/kg) do que na chuva (139,1±60,45 mg/kg). Em caprinos os teores de Zn no soro foram de 12,01±9,61 μmol/L na seca e 11,6±4,93 μmol/L na chuva e os do fígado foram de 134,2±26,58 mg/kg na seca e 131,45±76,55 mg/kg na chuva. Os teores séricos e hepáticos de Zn foram semelhantes em caprinos e ovinos. Considerando que os teores de Zn sérico encontram-se abaixo dos valores considerados como marginais e os hepáticos dentro do limite de normalidade, embora próximos ao limite inferior da referência, recomenda-se a suplementação com Zn, principalmente durante o período da seca.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2:tede2/5116 |
| Date | 26 February 2010 |
| Creators | MARQUES, Allan Vieira dos Santos |
| Contributors | SOARES, Pierre Castro, PINHEIRO JÚNIOR, José Wilton, OLIVEIRA, Erika Christina Santos, ALENCAR, Sylvana Pontual de |
| Publisher | Universidade Federal Rural de Pernambuco, Programa de Pós-Graduação em Ciência Veterinária, UFRPE, Brasil, Departamento de Medicina Veterinária |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da UFRPE, instname:Universidade Federal Rural de Pernambuco, instacron:UFRPE |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -3061482854177903105, 600, 600, 600, 600, -3020210563763616780, 453670264235017319, -2555911436985713659 |
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