Spontaneous photosensitization by Heterophyllaea pustulata Hook. f. (Rubiaceae), in sheep from Northwestern Argentina     

Micheloud  J. F.  Colque-Caro  L. A.  Comini  L. R.  Cabrera  J. L.  Núñez-Montoya  S.  Martinez  O. G.  Gimeno  E. J. 《Tropical animal health and production》2017,49(7):1553-1556

Tropical Animal Health and Production - Heterophyllaea pustulata Hook. f. (Rubiaceae) is a phototoxic plant. It grows in the Andean area of northwest of Argentina, and it causes significant...  相似文献   

Epidemiology and effect of gastrointestinal nematodes on beef cattle from tropical Argentina     

V. H. Suarez  G. M. Martínez  J. F. Micheloud  A. E. Viñabal 《Tropical animal health and production》2018,50(4):801-806

The aim of this work was to study the epidemiology and the harmful effect of gastrointestinal nematodes (GINs) on beef cattle in the piedmont forest and grassland region of northwestern Argentina, between March 2015 and March 2016. Sixty weaned female calves were divided into three groups: STG—calves treated systematically with 200 mcg/kg moxidectin every 40–50 days; LTG—calves treated as usually locally implemented, with 200 mcg/kg ivermectin on May 4 and August 5; and UTG—calves not receiving treatment. Moreover, a group of 20 untreated first-calving cows was monitored. Eggs per gram of faeces (epg) and faeces cultures were performed. Live weight gain (LWG) was recorded. Differences among groups were compared using analysis of variance and Tukey test. At the start of the experiment, mean epg was from moderate to high (595?±?480); therefore, this group was treated in May. Mean UTG epg peaked (907?±?754) in mid-winter, decreasing toward spring. LTG epg only decreased partially after treatment, showing 54.2% of ivermectin efficacy. Epg values of STG were always negligible values (95.8% of moxidectin efficacy). The dominant nematode genus was Cooperia (81.9%), followed by Haemonchus (15.5%). The effect of treatments was evident from middle autumn, with STG showing a significantly (p?<?0.002) higher LWG than the other groups. Toward the end of the trial, LWG of STG and LTG increased by 27.2 and 8.2%, respectively, to those of UTG. This preliminary study showed a winter epg peak and a negative effect of GINs on LWG, even in moderately infected calves.  相似文献   

Clinico-pathological findings in natural cases of “mascadera” in goats     

Micheloud  J. F.  Vera  T. A.  Colque Caro  L. A.  Gimeno  E. J. 《Tropical animal health and production》2018,50(2):441-444

“Mascadera” is a chronic emaciating neuropathy affecting goats; it produces significant economic losses in many regions and its cause is unknown. Here, the histological lesions found in 15 animals naturally affected by the disease are described. Complete necropsy was performed and tissue samples were collected for histopathological study. Severe atrophy of the masseter and buccinator muscles and tongue was observed, as well as vacuolar degeneration of neurons in the nuclei of the trigeminal, facial, and glossopharyngeal nerves. No relevant lesions were observed in other tissues. These findings and the clinical signs are consistent with those observed by other authors in animals spontaneously and experimentally intoxicated with Prosopis juliflora. The disease may be due to consumption of a similar species present in our country that is still unknown. Further research on the etiology and pathogenesis of this disease is needed to establish appropriate prevention guidelines.

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Effect of gastrointestinal nematodes on serum copper and phosphorus of growing beef calves in northwestern Argentina     

Suarez  Victor H.  Micheloud  Juan F.  Araoz  Virginia  Martínez  Gabriela M.  Rosa  Diana E.  Mattioli  Guillermo A. 《Tropical animal health and production》2019,51(3):613-618

Tropical Animal Health and Production - The aim of this work was to study the effect of gastrointestinal nematodes (GINs) on copper (Cu) and phosphorus (P) in blood of beef cattle in two ranches...  相似文献