Economic Benefits of Feeding Maize
100% Grass Silage 75% Maize Silage Diet
Cost /t DM Silages /t DM 80t 70t
Maize DM at Harvest 29% 23% 29% 30% 39%
Starch Content 1% 11% 27% 31% 35%
Cake Fed 135t 10 10 10 10 10
Forage Drymatter Intake 9.2 10.9 13.3 13.1 12.8
% Forage In Diet 51% 55% 60% 60% 59%
 
Milk Yield 28.1 29.4 32.7 33 30.8
Fat Kg Lease 3.0ppl 1.27 1.35 1.42 1.39 1.38
% pp% 1.80 4.52 4.59 4.34 4.21 4.48
Protein 0.86 0.95 1.06 1.05 0.98
% pp% 3.50 3.06 3.23 3.24 3.18 3.18
 
*Fed Conversion Efficiency 8.45 8.57 8.91 8.98 9.15
Best   Worst
**Economic Efficiency  
Benefit per cow per day ppc 41 86 79 54
20 week benefit 57 120 111 76
Best
*Fed Conversion Efficiency kg DM Diet per KG Fat & Protein
** Economic Efficiency = Value of Milk less total diet cost + lease charge
Conclusions
Compared to a 29% DM Italian silage at 14% CP, maize can deliver an
extra 45% additional FORAGE Intake
A 25-30% Starch crop at 28-33% Dry Matter content will give the best performance
Below 28% DM at low starch or above35% DM at high starch should be avoided
Crops around 30% DM are likely to deliver a minimum 80p per cow per day PROFIT vs. all grass
Aim for 1/4-1/2 Milk Line at 28-33% DM
A 28-30% DM crop will store without additive during the summer.
Source MDC Fact Sheet 37 - CEDAR 96/97