Nierembergia rivularis poisoning in cattle.

Autor: Schild CO; Instituto Nacional de Investigación Agropecuaria (INIA), Plataforma de Investigación en Salud Animal (PSA), Estación Experimental (EE) Tacuarembó, Ruta 5, km 386, Tacuarembó, 45000, Uruguay. Electronic address: cschild@inia.org.uy., Boabaid F; Polo de Desarrollo Universitario, Departamento de Patología, Facultad de Medicina Veterinaria, Universidad de la República, Tacuarembó, Uruguay., Machado M; Instituto Nacional de Investigación Agropecuaria (INIA), Plataforma de Investigación en Salud Animal (PSA), Estación Experimental (EE) Tacuarembó, Ruta 5, km 386, Tacuarembó, 45000, Uruguay., Saravia A; INIA, PSA, EE, La Estanzuela, Ruta 50 km 11, Colonia, Uruguay., Oliveira LGS; Instituto Nacional de Investigación Agropecuaria (INIA), Plataforma de Investigación en Salud Animal (PSA), Estación Experimental (EE) Tacuarembó, Ruta 5, km 386, Tacuarembó, 45000, Uruguay., Díaz S; INIA, Grupo de Pasturas, EE Tacuarembó, Ruta 5 km 385, Tacuarembó, Uruguay., Vildoza A; Instituto Nacional de Investigación Agropecuaria (INIA), Plataforma de Investigación en Salud Animal (PSA), Estación Experimental (EE) Tacuarembó, Ruta 5, km 386, Tacuarembó, 45000, Uruguay., Martinez A; Veterinario de Libre Ejercicio, Tacuarembó, Uruguay., Martínez R; Veterinario de Libre Ejercicio, Tacuarembó, Uruguay., Barros SS; Laboratorio de Patologia Veterinaria, Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul, Brazil., Riet-Correa F; Programa de Posgraduação Em Ciencia Animal Nos Trópicos, Escola de Medicina Veterinária e Zootecnia, Universidade Federal da Bahia, Salvador, Brazil. Electronic address: franklinrietcorrea@gmail.com.
Jazyk: angličtina
Zdroj: Toxicon : official journal of the International Society on Toxinology [Toxicon] 2021 Dec; Vol. 204, pp. 21-30. Date of Electronic Publication: 2021 Oct 26.
DOI: 10.1016/j.toxicon.2021.10.009
Abstrakt: Nierembergia rivularis causes enzootic calcinosis (EC) in sheep. In this work, we describe EC caused by N. rivularis in cattle. For 3 years cattle grazing in 7 paddocks were evaluated. Cows with clinical signs compatible with EC were detected in only one paddock with a morbidity of 9.4%, 24.5%, and 34.5% during the summer of 2019, 2020, and 2021, respectively. Affected cows weighed 55 kg less (p < 0.01) than cows without signs of the same paddock, and 19.6% of these cows had hypercalcemia and/or hyperphosphatemia. Typical soft tissue calcification was observed in 3 autopsied cows. Additionally to the arterial calcification, 2 cows had multiple mineralized foci in several veins. In the Paddock A where EC occurred, the pasture contained 7-12% N. rivularis. In the other 6 paddocks (Paddocks B-G) where EC had not occurred, the pasture had 0.2-3.5% N. rivularis. Cows grazing in Paddock A had ∼30% lower pregnancy rates than cows from Paddocks B-G. At the slaughterhouse, the carcasses of 45 cows from Paddock A weighed 17.6% (p < 0.01) less than 93 carcasses of cows from Paddocks B-G. Furthermore, the carcasses of cows from Paddock A were classified as low quality. Eight cows with EC signs from Paddock A and 10 cows without EC signs from Paddocks B-G were removed to a Lolium multiflorum pasture. After 120 days of grazing, the cows from Paddock A gained 45.2% less (p < 0.01) live weight than cows from Paddocks B-G. Poisoning with N. rivularis may cause significant economic losses in Uruguay due to low fertility rates and weight gain of affected cattle.
(Copyright © 2021 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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