Retrospective analysis of risk and timing of death from right heart failure in United States and Canadian feedlot necropsied cattle.

OBJECTIVE: To evaluate the risk and timing of right heart failure (RHF) in feedlot cattle. ANIMALS: Study population consisted of 1,717,356 cattle (5,527 cohorts) in 13 US and Canadian feedlots. There were 1,336 RHF diagnosed at necropsy. PROCEDURES: Multivariable models were utilized to evaluate risk and timing of RHF death. RESULTS: Arrival year was associated with RHF and was influenced by arrival quarter on the magnitude of risk of RHF (P < .01), but no linear increase over years was identified. The impact of feedlot elevation on RHF was modified by breed (beef, dairy, or dairy-cross; P < .01) with beef cattle in the highest elevation category having 0.54 times the risk of RHF as dairy cattle in the same elevation category (LCL = 0.31; UCL = 0.962). Cattle that died due to RHF and were treated for bovine respiratory disease died 11 days (LCL = 1.33, UCL = 20.2 days) sooner than cattle never treated for bovine respiratory disease (P = .03). Cattle breed was associated with RHF timing (P = .01), and dairy-cross cattle RHF cases died approximately 37 days earlier (SE = 13.0 days; P = .01) compared to beef cattle. CLINICAL RELEVANCE: This research showed demographic factors associated with RHF and their respective influence on risk and timing of RHF. Risk rates of RHF were similar to previous research. This could allow for comparisons across different feedlot populations, using different diagnoses at necropsy and RHF risk/rates do not appear to be increasing.

A retrospective analysis of feedlot morbidity and mortality outcomes in calves born to dams with known viral vaccination history.

This retrospective analysis aimed to determine the effects of a maternal viral vaccination program (MVVP; Express Verified) on calf health during the feeding period. In low- and high-risk populations, calves born to dams vaccinated pre-breeding with program products had improved morbidity and mortality outcomes compared with non-program animals.

Analyse rétrospective de la morbidité dans des parcs d'engraissement et résultats de mortalité chez les veaux nés de mères ayant des antécédents de vaccination connus. Cette analyse rétrospective visait à déterminer les effets d'un programme maternel de vaccination virale (PMVV; Express Verified) sur la santé des veaux durant la période d'allaitement. Dans les populations à risque faible et élevé, les veaux nés de mères vaccinées avant l'accouplement avec des produits de programme présentaient des résultats améliorés de morbidité et de mortalité comparativement aux animaux à l'extérieur du programme.(Traduit par Isabelle Vallières).