Table 7.

Immunoglobulin A titer responses (log₂ fold increase) to bovine respiratory disease (Inforce 3 vaccination; Zoetis Inc., Florham Park, NJ) and body temperature (BT) via thermal imaging cameras by calves fed milk replacer (MR) containing essential oils and prebiotic (EOC)

Treatments1
Item	CON	EP	EPC	SEM
No. calves	20	16	20	—
IgA
0 d	0.02b	0.02b	0.03a	0.005
21 d	0.92	0.81	0.89	0.24
BT, °C	28.1	28.2	27.6	0.42

^a,b,cMeans with unlike superscripts differ, P < 0.05.

¹CON = control [a 24:20% CP:fat (as-fed basis) MR without EOC]; EP = EOC mixed into the 24:20% CP:fat MR at a rate of 1.25 g/d; EPC = EOC mixed into the 24:20% CP:fat MR at a rate 1.25 g/d in addition of two 10-mL oral doses of liquid EOC at birth and 12 h. All MR were fed at 0.28 kg 2 times per d for 14 d, then 0.43 kg 2 times per day from days 15 to 35, and then MR were fed 1 time per day from days 36 to weaning at day 42.