Table 4. Influence of various milk by-products levels in weaned pig diet on BUN and IGF-1 of weaned pigs¹⁾

Criteria	Treatments²⁾				SEM	p-value
Criteria	NM	LM	MM	HM	SEM	Linear	Quadratic
BUN (mg/dL)
2 weeks	16.63	15.01	9.33	13.49	1.158	0.103	0.586
5 weeks	16.20	16.17	13.37	13.27	0.722	0.105	0.983
IGF-1 (ng/mL)
2 weeks	62.03	73.02	80.47	72.16	5.381	0.437	0.434
5 weeks	47.23	69.20	67.03	57.66	5.451	0.951	0.082

Least squares means of 6 observations per treatment.
NM, almost no milk by-products, 5% / 0%; LM, lower milk by-products, 10% / 5%; MM, middle milk by-products, 20% / 10%), HM, high milk by-products, 30% / 15%.
BUN, blood urea nitrogen; IGF-1, insulin like growth factor 1.