results observed during the Eu validation test of a new rumen protected lysine in commercial farms Before the launch in Europe of our rumen-protected lysine, AjiPro®
-L,
its efficacy was tested on 20 commercial farms all over Europe, with different strategies and different diets, from very concentrated diets in Spain to high forages diets in UK. On average, the diets included 48g of AjiPro®
-L and allowed the
cows to produce 1kg of milk volume compared with the normal diet. Lots of variability between herds was observed but some observations were similar in several herds (impact of average lactation stage, response in early lactation, impact milk volume vs milk protein)
Response when top-feeding all herd This strategy was selected on an Italian farm already feeding some protected methionine, and 40g AjiPro®
Response when reformulating with less protein, more forage/ energy Within these European tests, one was run in England. Here the objective was different; instead of a simple “on-top” strategy looking for more productivity, the goal was to reduce soybean meal inclusion in the diet, while increasing the forage proportion, and optimize milk production. The diet was typical of this region with corn and grass silage. The ration was formulated using AMTS software, using the CNCPS model. Levels of Crude Protein and
-L was added on-top in the test
group. The diet was similar in control and test groups, the only difference was AjiPro®
-L. The diet was typical of Italy, with corn silage, corn grain,
high moisture corn, soybean meal, cottonseed and ryegrass hay. Regarding nutrients, the diet provided 15.6% CP, 9.6% RDP, 31% starch, 27.4% aNDFom. Methionine was at 2.14% MP and lysine at 6.70% MP. Adding 40g AjiPro®
-L (=10g metabolizable lysine), the lysine went up to
7.0% MP, other AA remaining the same. The two groups had the same milk production in the pre-treatment
period. But during the experiment period, cows supplemented with AjiPro®
-L produced 0.95kg more milk than the control group.
Rumen Degradable Protein being high, we decided to decrease the soybean meal inclusion by 1.1 kg, and replace it with 250g rapeseed meal + 180g of protected soybean meal. In order to fill the space
Nutrient CP
RDP 3x Level 1 RUP 3x Level 1 Starch
Sugar (WSC) aNDFom
saved by the reduction of protein concentrate and to bring some energy 2kg of corn silage were added. Finally AjiPro®
NEI 3x NRC EE
DM
18.07% 11.46% 6.61% 18.4% 5.02% 33.6% 34.6% 5.4%
-L was added at 70g, in order to cover the lysine
requirements. Lysine supply of the test diet was increased by 12g and the lysine/methionine ratio = 2.92 was closer to optimal vs initial ration at 2.71.
Milk
Control Milk
AjiPro® -L
Met g Lys g His g
Lys:Met
Supply 67.1
196.1 70.2
% Req. 97.9
100.9 108.1 2.92:1
Profile
2.40 %MP 7.02 %MP 2.51 %MP
There was no contemporary group on the farm, so to analyze
Response when feeding early lactation cows The same top feeding strategy was tested this time in a French robot milking farm. Here AjiPro®
-L was added on top of the control diet,
at 50g per cow per day. Thanks to the availability of daily individual date, we could look more precisely at the responses depending on the stage of lactation, and confirm the literature data; thanks to lysine supplementation, the cows could express a higher milk production during the peak (see graph).
Energy Corrected Milk
the data, we looked at the production performances before, during (2 months), and after the diet change. During test (July-August 2018) herd average production remained stable despite a heat wave and higher days in milk. When AjiPro®
-L supplementation stopped in
September, herd average production dropped by 3kg. As a result, comparing pre and post to test period we observed that Period
the cows produced 1.5 kg more milk during the experimental diet period compared to farm diet, without affecting milk components concentrations.
Milk Group AjiPro®
-L
OFF ON
OFF AjiPro® -L effect
46.4 kg 46.3 kg 43.2 kg +1.5 kg
No
supplementation AjiPro®
-L supplementation
Conclusion Balancing dairy ration for Metabolizable Protein and Amino Acids is a more precise nutritional approach which supports farm efficiency and sustainability. Lysine being an essential amino acid for dairy cows, AjiPro®
-L gained leadership on the North American market, it is now available in Europe with results confirming efficacy.
-L offers opportunities to consider new feeding strategies
delivering higher productivity or better income over feed cost. After AjiPro®
FEED COMPOUNDER JULY/AUGUST 2019 PAGE 45
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