RESULTS
27 cows supplemented with Levucell SC via the robot produced on average 0.5L more milk per day with significantly higher levels of fat and protein (Table 1) than their control group counterparts. During the trial Kevin and Anne noticed a difference in manure quality amongst the robot milked cows and it quickly became clear that those cows not receiving Levucell SC were much looser than those receiving it. “Once we saw the difference we made the decision to put our other herd onto the live yeast and it didn’t take long for these cows to start presenting much cleaner in the herringbone parlour confirming the results seen in the robot” say Kevin. “Having completed the trial and run the figures with Anne, the additional milk solids versus the cost of the live yeast gave a return of investment of 6:1 and we’ve asked our feed supplier to include Levucell SC TITAN in our feed for this year.”
STABILITY
Like many other biological feed additives such as vitamins and enzymes, live yeast is sensitive to external stresses such as heat, moisture, pressure or contact with certain chemicals or trace elements. One of the challenges of including a live yeast in a grazing supplementary feed is that very often the conditions needed to make the pellet are more challenging due to a higher fibre content. As a result, protection is essential to ensure stability through the feed pelletisation process and during storage. Levucell SC TITAN benefits from a patented method of micro-encapsulation called TITAN. Benchmarking studies performed by independent and recognized institutes have demonstrated the higher stability of TITAN vs. other non-coated yeast sources (Fig 1).
non-
coated beadlets
CFU/G
1.00E+08 1.00E+07 1.00E+06 1.00E+05 1.00E+04 1.00E+03 1.00E+02
Levucell SC titan -0.57 log -1.69 log -3.48 log Beadlet A Beadlet B Beadlet C
CONCLUSION Rumen specific live yeast can be an effective tool to improve milk performance at grass provided it survives the feed pelleting process.
Unsupplemented cow
Levucell SC supplemented cow
Figure 1. Pelleting stability of TITAN vs. non- coated live yeast beadlets (85°C) (IFF, 2017)
FEED COMPOUNDER MARCH/APRIL 2020 PAGE 33
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