|  |  | United States | |||||
---|---|---|---|---|---|---|---|---|
Item | Mean ± SD | CAN12 | UF13 | UF24 | UF35 | UF46 | UF54 | |
n | 454 (total) | 216 | 35 | 40 | 51 | 12 | 100 | |
Rumen sampling, DIM | 62 ± 3 | 64 | 60 | 60 | 60 | 66 | 60 | |
First day, DIM | 56 ± 15 | 42 | 50 | 50 | 50 | 85 | 61 | |
Last day, DIM | 105 ± 12 | 91 | 100 | 105 | 100 | 125 | 110 | |
Total collection days | 50 ± 3 | 49 | 51 | 56 | 51 | 40 | 49 | |
DMI, kg/d | 22.6 ± 2.60 | 24.2 | 22.2 | 23.9 | 20.9 | 21.3 | 23.1 | |
Milk production, kg/d | 40.4 ± 6.80 | 40.5 | 40.8 | 40.3 | 34.7 | 42.2 | 43.8 | |
NESec, Mcal/d | 27.1 ± 4.20 | 29.1 | 26.6 | 27.1 | 25.4 | 25.8 | 28.6 | |
BW0.75, kg | 127 ± 9.70 | 132 | 121 | 137 | 119 | 122 | 134 | |
BEC, kg/d | 2.60 ± 3.20 | 2.25 | 2.26 | 4.51 | 2.38 | 0.66 | 3.25 | |
Chemical composition | Â | Â | Â | Â | Â | Â | Â | |
OM | 92.7 ± 0.61 | 93.4 | 92.1 | 92.5 | 92.4 | 93.7 | 92.8 | |
CP | 17.0 ± 0.88 | 15.8 | 16.8 | 17.7 | 18.4 | 16.3 | 16.9 | |
 RDP1 | 10.9 ± 0.47 | 10.7 | 11.9 | 10.1 | 11.0 | 11.4 | 11.4 | |
 RUP1 | 5.22 ± 0.13 | 5.10 | 5.40 | 4.90 | 5.20 | 5.00 | 5.20 | |
NDF | 28.6 ± 4.07 | 29.3 | 29.8 | 34.2 | 23.5 | 26.8 | 25.3 | |
 Forage NDF | 23.0 ± 2.63 | 25.6 | 18.4 | 19.3 | 21.6 | 18.2 | 22.5 | |
Starch | 30.5 ± 1.61 | 27.1 | 31.1 | 27.9 | 31.7 | 31.8 | 31.5 | |
ADF | 16.0 ± 3.02 | 19.4 | 16.6 | 18.3 | 15.7 | 10.7 | 15.1 | |
NFC | 43.1 ± 5.37 | 45.1 | 41.4 | 33.4 | 45.7 | 48.6 | 46.1 | |
Ether extract | 4.64 ± 1.59 | 3.63 | 4.10 | 7.27 | 5.44 | 4.26 | 4.26 | |
NEL, Mcal/kg of DM | 1.69 ± 0.03 | 1.68 | 1.67 | 1.74 | 1.70 | 1.73 | 1.65 |