Table 4.

Serum concentrations of glucose, urea nitrogen (SUN), and haptoglobin from lactating ¾ Holstein × ¼ Gir dairy cows assigned to receive (SUPP; n = 18) or not (CON; n = 18) 30 g/cow daily (as-fed basis) of a supplement containing condensed tannins, essential oils, and pungent compounds (Actifor Pro; Delacon Biotechnik GmbH; Steyregg, Austria) from d 0 to 84 of the experiment^a

Item	SUPP	CON	SEM	P-value
Glucose, mg/dL	57.6	55.0	1.4	0.21
SUN, mg/dL	17.6	17.2	0.5	0.57
Haptoglobin, mg/mL	0.097	0.137	0.015	0.05

^aBlood samples were collected weekly (d –7 to 84), before the morning feeding and milking during the experiment (0530 h). Values obtained on d –7 and 0 were averaged and included as covariate within each respective analysis; therefore, values reported are covariately adjusted least square means.