Table 3. Descriptive statistics of the 30 most abundant bacterial genera.

Genera	3 days		14 days		28 days		35 days
	P1	MRA2	P	MRA	P	MRA	P	MRA
Mannheimia	100%	3.1	100%	24.9	100%	15.6	100%	15.4
Mycoplasma	100%	2.9	100%	10.8	100%	18.2	100%	15.5
Moraxella	100%	9.1	100%	18.4	99%	2.6	100%	4.8
Psychrobacter	100%	13.5	100%	8.4	99%	3.1	100%	7.0
Pseudomonas	100%	4.0	100%	13.1	100%	5.5	99%	1.2
Acinetobacter	100%	5.3	100%	1.7	100%	5.2	100%	3.6
Cellulomonas	98%	0.2	84%	0.1	98%	5.2	100%	5.2
Bacteroides	100%	3.3	99%	1.2	99%	2.3	100%	4.0
Escherichia	100%	4.2	99%	0.6	100%	2.9	99%	0.3
Corynebacterium	100%	2.5	99%	0.3	99%	2.1	100%	2.2
Fusobacterium	100%	1.1	100%	0.7	99%	1.9	100%	1.5
Pasteurella	100%	0.7	99%	2.2	99%	0.8	99%	0.6
Pedobacter	100%	1.1	99%	0.2	98%	2.3	100%	1.2
Streptococcus	100%	1.8	100%	1.5	99%	0.7	99%	0.5
Serratia	100%	2.6	99%	0.4	100%	1.4	99%	0.3
Prevotella	100%	1.0	99%	0.4	99%	0.8	100%	1.8
Staphylococcus	100%	1.1	99%	0.2	100%	1.8	100%	0.7
Ruminococcus	100%	1.3	99%	0.3	99%	0.7	100%	1.2
Candidatus Blochmannia	100%	0.9	100%	0.3	100%	1.1	100%	1.1
Porphyromonas	100%	1.3	99%	0.2	99%	0.4	100%	1.4
Clostridium	100%	1.9	100%	0.2	99%	0.4	100%	0.9
Blautia	100%	1.0	100%	0.2	99%	0.9	100%	1.2
Brenneria	100%	0.9	99%	0.8	96%	0.1	98%	0.5
Gallibacterium	100%	1.0	96%	0.5	99%	0.7	100%	0.4
Stenotrophomonas	99%	0.1	95%	0.1	99%	1.5	100%	0.4
Treponema	100%	0.9	100%	0.5	98%	0.2	99%	0.7
Sphingobacterium	100%	0.5	100%	0.5	99%	0.8	99%	0.4
Aggregatibacter	85%	0.1	99%	1.0	98%	0.1	97%	0.2
Aerococcus	99%	0.7	97%	0.2	99%	0.5	100%	0.4
Flavobacterium	100%	0.5	96%	0.1	99%	0.6	100%	0.5

¹P = Percentage of study calves in which the indicated genus was detected at the given age at sample collection.

²MRA = Mean relative abundance of the respective bacterial genera at the given postnatal age.