Table 7.

Summarized results of the T-cell search.

Type of study (N, # groups)	Basal diet Zn	Zn supplement & formulation [Zn dose]	Route	Duration of supplementation	Animals	Outcomes*	Findings	Reference
RCT (N=72, 3)	0 mg/kg	A. 7 g/d organic trace mineral mix [951 mg/d Zn]	PO	42 days	284 ± 25 kg angus crossbred steers	Activation surface marker expression without stimulation (CD2, CD16, CD25, CD44, CD45RO)	CD25 MFI  C > A &  B, day 42 % CD45RO cells  B > A &  C, day 0	(17)
		B. 7 g/d organic trace mineral mix & 1000 mg/d Zn AA for 14 days then only the organic trace mineral mix [1900, 929 mg/d Zn]		14 days, 28 days
		C. Inorganic trace mineral mix formulated to match group A. [1095 mg/d Zn]		42 days

RCT, randomized controlled trial; Zn, zinc; mg, milligram; kg, kilogram; g, gram; d, day; AA, amino acid complex; PO, per oral; CD, cluster of differentiation. *Only stimulations and outcomes relevant to the assessment of T-cells are listed.