Maize Results

Adam Clay, Ruminant Manager at Frank Wright, takes a look at the key points from the latest maize results  from 447 samples taken from across GB.

Last year's maize crops had a welcome relief from rain and dull weather. A late season bloom saw some very good crops, resulting in ME and starch levels at 11.4 ME and 28.5 % respectively.

This year's weather has lead us to believe that crops would be very disappointing due to the lack of sunlight to develop the starch which is so highly required in maize forage.

Similar effects have been seen in wheat this year, with low bushel weights. The effects on energy have been mixed but they did result in lower starch levels.

In fact, this year's maize forages have been better than expected, although still lower than last year.

Analyses of 11.2 and 28% of ME and Starch respectively are 0.2 ME and 0.5% lower than last year. At a dry matter intake of 10kg this equates to 2MJ difference, or 0.38 litres/head/day.

A larger effect of the bad weather through the summer will be the dry matter of the crop. At 29.8% this is 3.3% wetter than last year, again at 10kg DMI cows will need to increase fresh weight intake by 3.33kg to achieve the same dry matter intake as last year, or 5kg to achieve the same energy intake.

As with wheat, when energy density is decreased, protein and fibre are generally marginally increased. This year's forages are 0.1% and 1.3% higher in protein and NDF respectively.

To conclude, quality is better than expected but lower than last year. Starch levels are good and in fact higher than 2010 and 2009 harvests, therefore energy intake from the crop should not be limiting. Dry matter may affect both dry matter intake and rumen health, linked with higherpotential acid loading. Balancing rumen health will be key.

As ever the averages give a guide, but the extremes are significant and may cause problems, therefore accurate analyses and interpretation will be essential in maximising performance.

Results are on-going and for the very latest results and analysis go to Frank Wright.


 
                                                                                                                                                                                                      

   
 

2011
  - 2012


 

 

2012
  - 2013


 

 

Min


 

 

Max


 

 

Dry
  Matter


 

 

%


 

 

33.1


 

 

29.8


 

 

13.4


 

 

51.8


 

 

Crude
  Protein


 

 

%


 

 

8.3


 

 

8.4


 

 

5


 

 

12.5


 

 

D-Value


 

 

%


 

 

71.7


 

 

70.7


 

 

62.3


 

 

77


 

 

ME


 

 

Mj/kg


 

 

11.4


 

 

11.2


 

 

9.5


 

 

12.3


 

 

Starch


 

 

%


 

 

28.5


 

 

28


 

 

6.1


 

 

45.7


 

 

NDF


 

 

%


 

 

49.4


 

 

50.7


 

 

38.1


 

 

71.8


 

 

ADF


 

 

%


 

 

22.2


 

 

23.3


 

 

17.2


 

 

34.8


 

 

ADL


 

 

%


 

 

1.7


 

 

1.99


 

 

0.05


 

 

6.4


 

 

RSV


 
 
 

284


 

 

284


 

 

236


 

 

380


 

 

PAL


 

 

mEq/kg


 

 

927


 

 

998.68


 

 

494.4


 

 

1381.5


 

 

FIP


 

 

g/kg
  0.75


 

 

106.6


 

 

101.9


 

 

75


 

 

131.9


 

 

pH


 
 
 

3.9


 

 

3.9


 

 

3.5


 

 

5.9


 

 

Ash


 

 

%


 

 

3.6


 

 

3.4


 

 

1.7


 

 

7.5


 

 

MPB


 

 

g/kg
 


 

 

21.5


 

 

24.1


 

 

13.3


 

 

84.2


 

 

MPN


 

 

g/kg
 


 

 

54.9


 

 

56.3


 

 

31.3


 

 

84.2


 

 

MPE


 

 

g/kg
 


 

 

79.4


 

 

75.5


 

 

58.4


 

 

89.5