Table 4.

Effect of breed, class of somatic cell counts, farm on cortisol concentration in milk and plasma (ln of pg/ml) of dairy cows in study 1. The model includes the linear effect of days in milking (DIM) and milk yield (kg/d)

	Milk			Plasma
	Mean	Se	Mean	Se
Breed
IH	5.77	0.06a	7.81	0.11Ns
IS	5.62	0.07b	8.02	0.08Ns
Class
#1	5.72	0.05Ns	7.84	0.09Ns
#2	5.55	0.15Ns	8.01	0.16Ns
#3	5.70	0.05Ns	7.90	0.07Ns
Farm
FA	5.83	0.08A	8.24	0.10A
FB	5.44	0.09B	7.84	0.11B
FC	5.61	0.11B	7.27	0.12C
FD	5.92	0.06A	8.31	0.13A
DIM	−0.002	0.001Ns	−0.001	0.002Ns
Milk yield	0.010	0.007Ns	−0.006	0.011Ns
General Mean	5.72	0.06	7.98	0.09

IH Italian Holstein, IS Italian Simmental. FA to FD farm A to farm D, se standard error. DIM days in milking. Covariates appearing in the model are evaluated at the following values for Milk and Plasma cortisol of experiment 1: DIM = 142.25, Milk, kg/d = 33.61

^a, ^b on the same column denote significant differences for P < 0.05; ^A, ^B, ^C on the same column denote significant differences for P < 0.01; ^Ns: not significant