Ruminant Nutrition: Dairy - Fats

ranking of critical inputs was, for diet 1, SBM kd (r=-0.5), CS A fraction (r=-0.34), and dried corn kd (r=-0.25), for diet 2, SBM kd (r=-0.55), grass hay CP (r=0.32), and dried corn kd (r=-0.31). For the CNCPS, the ranking was, for diet 1, SBM kd of B2 pool (r=-0.5), dried corn kd (r=-0.26), and WB CP (r=0.26), for diet 2, SBM kd (r=-0.52), grass hay CP (r=0.36), and dried corn kd (r=-0.35). One SD increase (1.5 %/h) in SBM kd resulted in a 0.5 SD decrease in MP from RUP (Diet 1 SD= 153 g, Diet 2 SD=208 g), while for the CNCPS model, 1 SD increase (4 %/h) in kd for SBM B2 kd resulted in a > 0.5 SD decrease (Diet 1 SD=136 g, Diet 2 SD=177 g). Because of the intrinsic variation in kd measurements and the sensitivity of the current models, research is needed to improve the methodology used to obtain kd. Diet 1 Diet 2 CNCPS1 CNCPS2 NRC CNCPS1 CNCPS2 NRC