Table 4.

Morbidity parameters during a 45-d feedlot receiving period of beef steers administered (BAS; n = 12) or not (CON; n = 12) a BAS at feedlot entry (day 0)^1,2

Item	CON	BAS	SEM	P-value
Steers treated for respiratory disease, %	76.6	82.4	3.2	0.20
1 treatment required	47.6	59.3	4.2	0.04
2 treatments required	42.3	31.4	4.1	0.05
3 treatments required	10.1	9.34	3.1	0.84
Mortality, %	7.60	7.00	1.99	0.83

¹Steers individually received 5 mL of a BAS (IRSEA Group, Quartier Salignan, France) or placebo (CON; diethylene glycol monoethyl ether) upon feedlot arrival on day 0. Treatments (5 mL) were applied topically to the nuchal skin area of each animal.

²Steers were observed daily for BRD signs according to the DART system (Zoetis, Florham Park, NJ), and received antimicrobial treatment as in the study by Lopez et al. (2018). Steers were removed from the experiment if a third medical treatment was warranted.