Table 6.

Meta-regression comparing the associations between covariates and measured outcomes.

Parameter	Covariates		QM	Df	p-Value	R2 (%)
Average daily gain (ADG)	Bee pollen dose		0.351	1	0.554	0.0
	Supplementation period		0.259	1	0.611	0.0
	Rabbit´s age		1.287	1	0.257	0.0
	Supplementation method		2.919	2	0.232	0.0
	Sex		4.093	3	0.252	0.0
	Rabbit strain		1.327	2	0.515	0.0
Daily feed intake (DFI)	Bee pollen dose		0.419	1	0.517	0.0
	Supplementation period		0.005	1	0.942	0.0
	Rabbit´s age		0.136	1	0.713	0.0
	Supplementation method		7.729	2	0.021	20.38
	Sex		6.102	3	0.107	0.0
	Rabbit strain		4.295	2	0.117	5.27
Glucose	Bee pollen dose		0.001	1	0.975	0.0
	Supplementation period		0.502	1	0.479	0.0
	Rabbit´s age		0.036	1	0.850	0.0
	Supplementation method		1.961	2	0.375	0.86
	Sex		2.824	2	0.244	6.72
	Rabbit strain		0.147	2	0.929	2.40
Albumin	Bee pollen dose		4.971	1	0.026	27.46
	Supplementation period		8.465	1	0.004	30.01
	Rabbit´s age		13.467	1	0.036	21.83
	Supplementation method		7.471	2	0.024	19.70
	Sex		7.205	2	0.127	0.0
	Rabbit strain		0.538	2	0.764	0.0
Globulin	Bee pollen dose		0.420	1	0.517	0.0
	Supplementation period		5.680	1	0.017	27.57
	Rabbit´s age		0.008	1	0.928	0.0
	Supplementation method		3.086	2	0.214	7.46
	Sex		6.056	2	0.114	2.18
	Rabbit strain		0.150	2	0.928	0.0
Total protein	Bee pollen dose		2.345	1	0.126	5.49
	Supplementation period		10.458	1	0.001	45.80
	Rabbit´s age		0.003	1	0.960	0.0
	Supplementation method		5.909	2	0.062	10.74
	Sex		6.269	2	0.061	5.76
	Rabbit strain		0.291	2	0.865	0.0

QM: coefficient of moderators; QM is considered significant at p ≤ 0.05; df: degree of freedom; R²: the amount of heterogeneity in the meta-analysis.