TABLE 2.

Growth and decrease phase coefficients and T₉₀ values (calculated for both the total survival curve and for the decrease phase only) for indicator and pathogenic bacteria in cow pats^a

Season	Indicator or pathogen	Increase coefficient		Decrease coefficient		T90 for decrease phase (days)b	T90 for deposition (days)
		Value (day−1)	R2	Value (day−1)	R2
Winter	E. coli			0.06	0.89	38	38
	Fecal streptococci	0.03	0.80	0.08	0.91	29	34
	Enterococci	0.06	0.85	0.04	0.98	58	62
	C. jejuni			0.14	0.97	16	16
	S. enterica	0.11	(1)c	0.09	0.99	26	26
Spring	E. coli	0.06	(1)c	0.06	0.89	38	39
	Fecal streptococci	0.23	(1)c	0.07	0.92	33	30
	Enterococci	0.48	(1)c	0.06	0.83	38	37
	C. jejuni			0.87	0.97	2.7	2.7
	S. enterica			0.08	0.96	29	29
Summer	E. coli	0.40	(1)c	0.05	0.74	46	48
	Fecal streptococci	0.53	(1)c	0.06	0.77	38	42
	Enterococci	0.25	(1)c	0.03	0.82	77	69
	C. jejuni			1.91	0.99	1.2	1.2
	S. enterica			0.04	0.87	58	58
Autumn	E. coli	0.15	0.98	0.05	0.93	46	66
	Fecal streptococci			0.07	0.98	33	33
	Enterococci	0.33	(1)c	0.05	0.94	46	57
	C. jejuni			0.49	0.99	4.7	4.7
	S. enterica	0.15	(1)c	0.06	0.95	38	38

^aThe coefficients (k) were derived from a regression of the natural logarithms: N = e^kt, where N is the count and t is time. T₉₀ values were calculated from T₉₀ = 2.303/k.

^bSame as the T₉₀ for deposition when there was no increase phase.

^cThere were only two data points.