Effect of acidity of concentrate and level fed on maize silage in Mid Lactation Cows
These were lo crude protein diets which showed little economic benefit over concentrate type either at hi or
lo starch levels.  Concentrates were formulated to be equal energy and protein but varying rumen acid load
Conclusion: At modest concentrate levels on pure maize silage the concentrate type matters little.
to moderately yielding mid - late lactation cows. Feed adequate protein
Maize Silage 29% DM
24.4% Starch
54.7 NDF
7.8% CP LL L ML LMIX HMIX MH H HH SED Sig.
Concentrates Fed KG 10 7 7 7 7 7 7 10
Acid Value 15 22 29 29 36 34 43 49
Crude Protein % Kg DM 20.5 26.5 26.5 26.5 26.5 26.5 26.5 20.5
Maize DM intake (kg/day) 11.5 13.2 12.9 13.1 13 12.9 12.4 10.1 0.53 ***
Total DM Intake 20.3 19.4 19.1 19.3 19.2 19.1 18.6 18.9
Ration Crude Protein 13.3 13.8 13.8 13.8 13.8 13.8 14.0 13.7
Milk yield Kg 27.2 27.5 25.3 26.6 26.4 26.5 25.5 26.6 0.71 <0.1
Milk fat % 3.82 3.97 4.3 3.76 4.16 3.87 4.2 3.73 2.21 <0.1
Milk fat kg 1.04 1.09 1.09 1.00 1.10 1.03 1.07 0.99
Milk protein % 3.08 3.1 3.23 3.13 3.16 3.18 3.28 3.31 0.44 ***
Milk protein kg 0.84 0.85 0.83 0.83 0.83 0.84 0.84 0.88
Fat & Protein KG 1.88 1.94 1.92 1.83 1.93 1.87 1.91 1.87
Live-weight change Kg 0.25 0.04 0.12 0.1   0.18 0.09 0.02 0.07 *
Total Feed per Kg Milk kg 0.75 0.70 0.75 0.72 0.73 0.72 0.73 0.71
Feeds Fed
Wheat 0.4   1.6 2.9   5.0 7.1
Wheat Feed   3.5        
Maize 1.1   0.7 0.3    
Sugar Beet   0.5     2.1  
Citrus         1.5  
Bran 2.0            
Apple Pomace 3.0 1.4   0.9 0.5    
Molasses 1.0 0.4   0.2 0.1    
Lucerne   0.1        
Soya   1.2     2.1 0.1 0.2
Sunflower 0.9   0.6 0.3 0.2  
Groundnut 1.3   1.5 1.6    
Protected Soya/Rape/Sunflower Rape 2.2 0.7 1.1 0.6 0.5 0.6 1.4 2.0
Urea 0.20 0.14 0.13 0.14 0.13 0.13 0.11 0.15
Fat/Oil 1.03 0.39 0.15 0.26 0.13 0.11 0.04 0.05
Limestone 0.22 0.18 0.17 0.21 0.24 0.02 0.21 0.30
Dical 0.14 0.08 0.04 0.08 0.07 0.11 0.08 0.11
Salt 0.18 0.13 0.13 0.13 0.13 0.13 0.08 0.12
Ammonium Chloride 0.04            
Min Vits 0.04 0.03 0.03 0.03 0.03 0.03 0.02 0.04
10 7 7 7 7 7 7 10