Ruminal effects of excessive dietary sulphur in feedlot cattle.

Sulphur (S) dietary excess can limit productive performance and increase polioencephalomalacia (PEM) incidence in feedlot cattle (FC). Sulphur excess ingested is transformed to hydrogen sulphide (H S) by sulfo-reducing ruminal bacteria (SRB), being high ruminal H S concentration responsible for aforementioned damages. As the ruminal mechanisms involved in H S concentrations increase have not been elucidated, this study aimed to evaluate the ruminal environment, and the association between ruminal H S and dissimilatory SRB (DSRB) concentration in FC experimentally subjected to S dietary excess.

[Outbreak of bovine paralytic rabies in a disease-free region of Argentina].

We report an outbreak of bovine paralytic rabies in a feed lot in a disease-free area in southern Santa Fe, Argentina. Six of 122 unvaccinated steers died after showing neurological signs (morbimortality = 4.9%) for 24-72 hours, 40-75 days after being transported to the feed lot from a farm located in Formosa.