. 2020 Jan 13;98(2):skaa005. doi: 10.1093/jas/skaa005

Table 10.

Performance, carcass traits, and economic outcomes of feedlot steers classified according to clinical BRD status

	Clinical BRD status
Variable	Clinical	Subclinical	Treated no lesions	Visually healthy, treated no lesions	Healthy	P-value
N	58	73	89	63	587	Chi = <0.001
In-weight, kg/animal	416.0 ± 8.66	425.1 ± 8.13	424.1 ± 7.45	437.4 ± 8.48	428.0 ± 5.98	0.183
Exit weight, kg/animal	593.3 ± 7.72^c	611.3 ± 7.17^bc	620.1 ± 6.59^b	652.1 ± 7.51^a	639.4 ± 5.28^a	<0.001
ADG, kg/d	1.4 ± 0.07^c	1.6 ± 0.07^b	1.6 ± 0.06^b	1.9 ± 0.07^a	1.8 ± 0.05^a	<0.001
Carcass weight, kg/carcass	328.2 ± 4.53^c	336.3 ± 4.22^b	339.0 ± 3.90^b	356.1 ± 4.48^a	352.3 ± 3.23^a	<0.001
MSA marble score	299.4 ± 11.47^c	326.2 ± 10.88^b	340.2 ± 9.95^ab	344.4 ± 11.26^ab	349.1 ± 7.92^a	<0.001
MSA Index	54.0 ± 0.31	54.0 ± 0.29	54.1 ± 0.27	54.0 ± 0.30	54.1 ± 0.21	0.191
P8 fat depth¹	12.9 ± 0.85^c	15.2 ± 0.80^bc	14.9 ± 0.73^bc	17.9 ± 0.83^a	16.5 ± 0.59^ab	<0.001
Rib fat depth	6.0 ± 0.55^b	7.2 ± 0.51^ab	7.1 ± 0.47^ab	7.6 ± 0.54^ab	8.0 ± 0.38^a	<0.001
Purchase price, $/animal	1,346.21 ± 27.02	1,364.31 ± 25.26	1,375.22 ± 23.17	1,406.12 ± 26.35	1,374.41 ± 18.60	0.290
Feed cost, $/animal²	301.32 ± 4.773^b	315.91 ± 4.260^b	313.24 ± 3.903^b	334.51 ± 4.633^a	329.11 ± 1.724^a	<0.001
BRD treatment cost, $/animal	44.50 ± 1.144^a	5.71 ± 1.003^d	35.21 ± 0.922^b	27.81 ± 1.091^c	5.72 ± 0.353^d	<0.001
Other treatment cost, $/animal³	31.41 ± 5.426	29.92 ± 4.007	21.93 ± 4.430	13.86 ± 13.291	24.22 ± 3.049	0.423
Price received, $/kg cwt	5.70 ± 0.043^b	5.83 ± 0.041^ab	5.90 ± 0.043^a	5.82 ± 0.042^ab	5.91 ± 0.032^a	0.003
Total slaughter value, $/animal	1,876.21 ± 27.944^d	1,976.32 ± 26.132^c	2,005.02 ± 24.184^bc	2,080.11 ± 27.344^a	2,049.32 ± 19.684^ab	<0.001
Net return, $/animal⁴	−24.72 ± 21.063^d	122.11 ± 18.450^c	98.61 ± 17.203^c	198.14 ± 19.862^a	189.22 ± 6.523^a	<0.001

¹P8 fat depth: fat depth at the crest of third sacral vertebra measured on the hot carcass.

²Data were square transformed to obtain P-values due to non-normality.

³Other treatment cost: cost of veterinary treatments for ailments other than BRD including vaccinations at induction.

⁴Net return calculated using slaughter value less the purchase price, induction processing cost of $7.30/animal, feed cost, BRD treatment cost, other veterinary treatment cost, yardage cost of approximately AUD$1.05/animal/d, transport cost (flat load rate of AU$635/load with a load weight limit of 35,500 kg/load), buyers commission, and levy.

^a–cWithin a row, means without a common superscript letter differ (P < 0.05).