The effect of age when group housed and other management factors on playing and non-nutritive sucking behaviour in dairy calves: a cross sectional observational study

Table 1 Overview of studies on optimal age for group housing of dairy calves

Reference	Calves’ ages when tested	Age when group housed (A)	Age when group housed (B)
Abdelfattah et al. [14]	3 days to 7 weeks	2 to 3 days	7 to 14 days
Duve and Jensen [12]	5 weeks	1 day	3 weeks
Jensen and Larsen [13]	6 weeks	1 day	2 weeks
Bolt et al. [9]	6 weeks	*5 days*	5 weeks
Costa et al. [15]	4 to 10 weeks	*6 days*	6 weeks
Meagher et al. [16]	7 weeks	*6 days*	6 weeks
Rasmussen et al. [17]	1 to 4 weeks	6 days	*2 weeks*

The ages marked with bold italic indicates that this age had a benefit over the age without marking. The ages written with italics indicates no differences between the two ages, or that there are advantages and disadvantages for both ages

ISSN: 1751-0147