Effect of grazing pasture with a low selenium content on the concentrations of triiodothyronine and thyroxine in serum, and GSH-Px activity in erythrocytes in cows in Chile

Contreras, P. A.; Wittwer, F; Matamoros, Roberto; Mayorga, I.; Schaik, G. van

doi:10.1080/00480169.2005.36472

Cited by 15 publications

(4 citation statements)

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“…Southern Chile, which coincides with the huemul distribution, is known to result in Se deficient livestock [ 17 – 19 ]. Also, Se concentrations in most forages in southern Chile are deficient [ 20 ] and this deficiency is associated with overt pathology in livestock including white muscle disease [ 21 ]. Similarly, the first-ever study of the Se status in huemul was done in the subpopulation of the Chilean Reserva Nacional Lago Cochrane (RNLC, 47.214806°S, 72.509129°W) [ 22 ], revealing that 73% of huemul were deficient (64% severely deficient) [ 23 ] as compared to reference values as determined for deer and cattle [ 24 , 25 ].…”

Section: Potential Etiologic Factors Causing Osteopathology In Huemulmentioning

confidence: 99%

Osteopathology and selenium deficiency co-occurring in a population of endangered Patagonian huemul (Hippocamelus bisulcus)

Flueck

2015

BMC Res Notes

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BackgroundAbout 1,000 endangered Patagonian huemul deer (Hippocamelus bisulcus) remain in Chile and 350–500 in Argentina. Most groups (>100) are not recovering, and prevalence of osteopathology in Argentina was at least 57%. Here I describe relevant cases of osteopathology from a Chilean population which, however, recently also provided data on trace mineral status, supporting the initial hypothesis that nutrition may be a primary etiologic factor. Additionally, recent data on bone chemical composition of Argentine cases and soil analyses are discussed.ResultsFluoride levels in Argentine cases with osteopathology were low and fluorosis was discarded as an etiological factor. Selenium deficiency occurred in 73% of huemul from the Chilean population which exhibited several cases with osteopathology. The pathophysiognomy included extensive erosion; tooth loss; porosification; perforations of palate, maxillar and mandibular bone with frequent exposure of tooth roots; and fractured mandibula. Areas currently used by remaining huemul have mainly acidic volcanic soils, which reduces selenium bioavailability: mean soil selenium levels from areas typically used by extant huemul were very deficient (0.19 ppm), corroborating documented overt selenium deficiency in local livestock and plants. The area of extant huemul is known to result in primary iodine deficiency in livestock which is aggravated by selenium deficiency.ConclusionsCurrently the most parsimonious explanation for frequent osteopathology and lack of numerical recovery are the combined effects of selenium and iodine deficiencies based on: osteopathology in a population of selenium deficient huemul; selenium deficient livestock, plants and soils; acidic soils; and regional primary iodine deficiency. The nexus between mineral nutrition and population dynamics of huemul may be due to constraints on their movements to fertile lowlands, including the elimination of historic migratory traditions, and concomitant elimination of source populations.

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Section: Potential Etiologic Factors Causing Osteopathology In Huemulmentioning

confidence: 99%

Osteopathology and selenium deficiency co-occurring in a population of endangered Patagonian huemul (Hippocamelus bisulcus)

Flueck

2015

BMC Res Notes

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“…Thus, in this study, there was no significant change (Student t ‐test; P > 0.05) in the serum thyroid hormone levels of Bos indicus cattle at different days following infection. It is also possible that these subtle changes observed in the thyroid hormone levels are related to the nutritional and physiological status of the animals (Aceves et al., 1987; Contreras et al., 2005; Klimiene et al., 2008).…”

Section: Clinical Signs and Lesions Observed In Indian Cattle (Bos Imentioning

confidence: 99%

Absence of Heat Intolerance (Panting) Syndrome in Foot-and-Mouth Disease-Affected Indian Cattle (Bos indicus) is Associated with Intact Thyroid Gland Function

Maddur

Rao²,

Chockalingam

et al. 2011

Transboundary and Emerging Diseases

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Foot-and-mouth disease (FMD) is a highly contagious and economically important viral disease with high morbidity and reduced productivity of affected animals. We studied the heat intolerance (HI) (panting) syndrome and the effect of FMD virus (FMDV) infection on thyroid gland function in Indian cattle (Bos indicus). Experimental infection with FMDV Asia 1 resulted in a mild form of disease with superficial lesions. Heat intolerance syndrome and its signs were not observed among the recovered animals. Subtle changes in the serum level of thyroid hormones, triiodothyronine (T₃) and thyroxine (T₄) were observed. However, there were no distinct histological changes in the thyroid gland, and FMDV antigens were not detected in the thyroid tissues. Our results thus suggest that the absence of panting syndrome in FMD-affected Bos indicus cattle may be associated with intact thyroid gland function.

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“…El requerimiento mínimo de Se en el forraje para equinos es de 0.1 ppm (2,6). En el sur de Chile se ha descrito que un 60% de los forrajes presenta concentraciones menores a 0.1 ppm (7), considerado como valor mínimo aceptable para equinos, y consecuentemente insuficiente para satisfacer sus requerimientos nutricionales en entrenamiento, gestación o lactación. Debido a esto, tanto en Chile (5) como en otros países de Sudamérica (8), se han presentado cuadros clínicos asociados a la carencia de Se en rumiantes y equinos mantenidos en condiciones de pastoreo.…”

Section: Introductionunclassified

Estatus de selenio en equinos Criollo-Chileno a pastoreo y su respuesta a la suplementación

Noro

Chihuailaf

et al. 2013

Rev MVZ Córdoba

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RESUMENObjetivo. Dos experimentos se realizaron para determinar el estatus de selenio en equinos Criollo-Chileno a pastoreo y, evaluar la respuesta a la suplementación con Na2SeO3. Materiales y métodos. Exp.1A caballos pertenecientes a 10 criaderos del sur de Chile se les determinó la actividad sanguínea de glutatión peroxidasa (GPx, EC.1.11.1.9) (AcGPx). Los animales pertenecieron a 3 grupos, pastoreo de otoño (PO, n=40), pastoreo de otoño y suplementados con avena (PO+A, n=47), y, pastoreo de primavera (PP, n=41). Exp2Se utilizaron equinos con carencia de selenio, distribuidos en tres grupos: G1, n=7, tratado con Na2SeO3 el día 0 (Se= 0.05 mg/kg pv, im); G2, n=8, suplementado con Na2SeO3, los días 0 y 15 y GC, n=8, control. La AcGPx se determinó al día 0, 30 y 120. Resultados. La mediana (Me) de la AcGPx en todos los grupos fue menor al límite adecuado (>130 U/gHb), mayor en PO+A (Me=92, P25%=47, P75%=129 U/gHb) y PP (Me=85, P25%=45, P75%=114 U/gHb) que en PO (Me=35, P25%=20, P75%=85 U/gHb) (p<0.05). En el experimento 2 la AcGPx fue similar y menor al adecuado en todos los grupos. La suplementación con Na2SeO3 aumentó (p<0.05) la AcGPx en G1 (121±52 U/gHb) y G2 (124±69 U/gHb), sin alcanzar valores adecuados. Conclusiones. Los equinos Criollo-Chileno a pastoreo en el sur de Chile presentan carencia de Se, mayor en otoño que primavera y menor al suplementar con avena. Adicionalmente, la administración parenteral de Na2SeO3 mejora el estatus de Se, pero sin revertir el cuadro carencial.

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Effect of grazing pasture with a low selenium content on the concentrations of triiodothyronine and thyroxine in serum, and GSH-Px activity in erythrocytes in cows in Chile

Cited by 15 publications

References 14 publications

Osteopathology and selenium deficiency co-occurring in a population of endangered Patagonian huemul (Hippocamelus bisulcus)

Osteopathology and selenium deficiency co-occurring in a population of endangered Patagonian huemul (Hippocamelus bisulcus)

Absence of Heat Intolerance (Panting) Syndrome in Foot-and-Mouth Disease-Affected Indian Cattle (Bos indicus) is Associated with Intact Thyroid Gland Function

Estatus de selenio en equinos Criollo-Chileno a pastoreo y su respuesta a la suplementación

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