Table 4. Lactation traits: descriptive statistics, estimates of variance due to the animal effect and proportion of the total phenotypic variance due to the animal effect (between animal repeatability estimates); data were weekly averaged daily records.

Trait	No. Records	Mean	Std. Deviation	CV1%	Animal Variance	Rep2
Milk yield (kg)	10,202	30.69	9.49	30.91	35.08*	0.71*
Fat yield (kg)	9,180	1.17	0.42	35.95	0.05*	0.45*
Protein yield (kg)	9,180	1.01	0.34	33.60	0.03*	0.44*
Feed intake (kg)	5,731	43.42	11.43	26.33	37.44*	0.39*
Dry matter intake (kg)	5,731	17.43	4.98	28.54	5.54*	0.39*
Feed to milk ratio	5,722	1.44	0.63	43.70	0.01	0.10
Dry matter to milk ratio	5,722	0.57	0.25	42.88	0.01	0.09
Live weight (kg)	9,716	590.61	83.01	14.05	2,529.29*	0.82*
Empty body weight (kg)	5,665	489.86	75.53	15.42	2,113.66*	0.76*
Body condition score (1–5)	8,377	2.08	0.43	20.80	0.09*	0.57*
Somatic cell count (1000/ml)	9,344	91.57	288.89	315.49	50,378.91*	0.58*

¹Coefficient of Variation;

²Between animal repeatability of the trait;

^*Significantly greater than 0 estimates (P<0.05).