부산대학교 도서관

Thirty-two pregnant crossbred cows individually fed chopped hay (6.28% CP) ad libitum in Calan gates were used to determine the effects of four levels of liquid supplement on forage and nutrient intake and digestibility. Eight cows were assigned by weight to one of four treatments: 0, 0.45, 0.91, or 1.36 kg (as-fed) of a molasses-based liquid supplement, which supplied 0, 100, 203, or 303 g CP daily. All four supplement levels were represented in each of eight pens. Cows were individually fed hay and supplement at 0700 daily, hay at 1600, and feed refusals were weighed each morning and evening prior to feeding to determine forage intake. There was no effect of supplement level on hay DMI (kg; P=0.55, %BW; P=0.84), hay DM digestibility (P=0.98), or hay digestible DMI (kg; P=0.53, %BW; P=0.78). There was a linear increase in total diet DMI (kg; P=0.04) due to supplement level, but there were no differences in total diet DMI on a %BW basis (P=0.19). A linear increase in total diet digestible DMI (kg; P=0.004, %BW; P=0.05) was due to supplement intake. There was no effect (P=0.13) of supplement level on diet DM digestibility. There were no treatment differences (P [greater than or equal to] 0.35) in hay nutrient intake or digestibility for OM, CP, NDF, or ADF on either a kg or %BW basis. Total diet CP intake, CP digestibility, and digestible CP intake were all linearly increased (P Key Words: Supplement level, Forage intake, Beef cows