View Full Table | Close Full ViewTable 1.

Ingredient and chemical composition of diets used in Exp. 1 and 2

 
Item Diet or feedstuff
Grower pellet Chopped alfalfa Pelleted alfalfa
Ingredient, % as fed basis
    Alfalfa sun-cured 43.60 100 100
    Corn 23.93
    Wheat middlings 15.00
    Soybean hulls 10.00
    Molasses cane 4.00
    Calcium carbonate 2.02
    Ammonium chloride 0.60
    Pelletizing agent 0.50
    Premixes1 0.35
Chemical composition, DM basis
    DM, % 88.5 91.1 86.8
    CP, % DM 15.8 15.5 15.8
    TDN, % DM 75.0 57.2 62.4
1Contained 2,000 mg/kg Mo, 44,000 IU/kg vitamin E, 9% Fe, 10% Zn, 6% Mn, 3.4% I, 0.03% Co, 0.02 IU/mg Se, 23,700 IU/mg vitamin A, and 2,250 IU/mg vitamin D.



View Full Table | Close Full ViewTable 2.

Performance and intake by ewe-lambs according to residual feed intake (RFI) classification in Exp. 1

 
Item1 Low RFI High RFI SEM P-value
No. of ewe-lambs 16 16
Growth traits
    Initial BW, kg 42.5 43.2 1.46 0.75
    Final BW, kg 61.1 61.6 1.90 0.84
    ADG, g/d 294 293 12.7 0.95
    DMI, kg/d 2.21 2.43 0.061 0.01
Feed efficiency trait
    RFI, kg/d –0.10 0.11 0.013 0.0001
Carcass traits
    Initial LMA, cm2 11.6 12.0 0.44 0.44
    Final LMA, cm2 17.6 17.1 0.38 0.41
    Initial BF, cm 0.22 0.25 0.014 0.28
    Final BF, cm 0.63 0.64 0.033 0.89
1Modeled values are reported for BW and ADG. LMA = LM area; BF = 12th-rib back fat thickness.



View Full Table | Close Full ViewTable 3.

Effects of residual feed intake (RFI) classification and method of feed processing on yearling ewe growth, intake, and carcass traits in Exp. 2

 
Item1 Chopped alfalfa
Pelleted alfalfa
SEM P-value
Low RFI High RFI Low RFI High RFI Alfalfa RFI Alfalfa × RFI
No. of yearling ewes 8 8 8 8
Growth traits and intake
    Initial BW, kg 53.4 53.1 58.6 60.5 4.27 <0.01 0.72 0.63
    Final BW, kg 60.4 61.4 73.2 73.2 2.53 <0.01 0.68 0.73
    ADG, g/d 71 89 300 301 45.13 <0.01 0.68 0.73
    DMI, g/d 2.0 2.4 3.0 3.9 0.38 <0.01 <0.01 0.26
Feed efficiency traits
    RFI, kg/d –0.15 0.15 –0.38 0.38 0.31 1.00 <0.01 0.15
    G:F, g/kg 26.1 32.3 99.1 79.2 18.32 <0.01 0.46 0.17
Carcass traits
    Initial LMA, cm2 17.5 17.5 17.6 18.1 1.03 0.56 0.61 0.71
    Final LMA, cm2 17.1 17.6 20.5 20.4 1.19 <0.01 0.77 0.63
    Initial BF, cm 0.48 0.51 0.40 0.45 0.058 0.06 0.23 0.77
    Final BF, cm 0.42 0.52 0.72 0.71 0.062 <0.01 0.06 0.18
1Modeled values are reported for BW and ADG. LMA = LM area; BF = 12th-rib back fat thickness.