Use of a Newer Phytase Source (HiPhos M and HiPhos GT) in Kent Swine Products

Michael Edmonds, Ph.D., Vice President, Swine Nutrition

The use of newer technologies to manufacture more effective phytase sources has been
rapidly emerging in recent years. HiPhos M (for meal feeds) and HiPhos GT (for pelleted
feeds) are two newer phytase sources from DSM Nutritional Products. Compared
to previous phytase products, these newer sources not only provide a greater release
of phosphorus and calcium, but are supposed to release more amino acids and energy
levels which can further enhance pig performance and economics.

We conducted a research trial to compare the newer phytase product (HiPhos M) to
a Kent-recommended grow-finish program without phytase. We fed grow-finish pigs a
six-phase program from a starting weight of 44 lb to a market weight of 285 lb. Diets
consisted of corn and soybean meal along with 200 lb/ton of Distillers Dried Grains with
Solubles, plus minerals, vitamins and amino acids. The data for these two treatments
are shown below:

Kent Research Trial1

Days 0-118 Control Phytase Adv. Phytase
Avg. Daily Gain, lb 2.05 2.06 0.5%
Avg. Daily Feed, lb 5.67 5.59 -1.4%
Feed/Gain 2.77 2.71 -2.2%
Cost/lb gain, ¢ 30.56 29.33 -1.23¢
Net Return, $/pig @ $65/cwt live price 82.80 86.39 +$3.59
1162 pigs/trt; 18 reps

The results show a numerical decrease in feed efficiency with the added phytase along
with very favorable economics in which cost of gain was lowered and net return was improved
by $3.59/pig compared to pigs fed the control diets. What is remarkable about the
data is the 2.2% improvement in feed efficiency from the added phytase. The reason we
know this is we also evaluated an additional treatment (data not shown) involving added
energy from animal fat. By comparing the added phytase treatment to our treatment with
added fat (which did significantly improve feed efficiency), we determined that the added
phytase treatment was releasing an additional 8 Kcal/lb of metabolizable energy which
provides a lot of value in the diet compared to the cost of animal fat. We also formulated
the above treatments with similar digestible amino acid levels, by providing a small release
of amino acid levels via the added phytase. In addition, our research also showed
that we can safely provide a calcium release of 0.11 units and a phosphorus and digestible
phosphorus release of 0.13 units from the added phytase level of 2,200 FYT/lb.

Based on the above data, we are updating our NexGen products with this new phytase
source. This includes starters, premixes, supplements and complete feeds. The feed
savings on a ton of complete feed will be about $1/ton with the NexGen and NexGen
60/50 PT products. Inclusion levels of NexGen Premixes have also changed (effective by
November 17, 2014) as shown below:

Changes in NexGen Premix Inclusion Levels in Grow-Finish Pigs

Premix Previous Inclusion Levels/ton1 New Inclusion Levels/ton1
2090 NexGen Premix 40/32 35/28
2091 NexGen Premix LYS 43/35 40/32
2092 NexGen Premix LYS DDG200 42/34 36/29
2093 NexGen Premix LYS DDG400 42/34 41/33
2094 NexGen Premix LYS DDG600 42/34 43/35
2105 NexGen AA Pak2 6 9
1The first number refers to the inclusion level/ton in grower diets while the second number refers to the inclusion level/ton in finisher diets; note that the newer phytase is providing a substantial release of phosphorus and calcium which lowers our inclusion levels by several lb/ton with the NexGen 2090, 2091 and 2092 products.

2Reducing soybean meal by 125 lb/ton results in less phosphorus, so monocalcium phosphate has been added to the AA Pak to meet the calcium and phosphorus requirements.

The reason that Product 2094 has a 1-lb increase in inclusion level/ton is due to the fact
that the newer phytase releases more phosphorus and requires that we add in a slight
increase in calcium in order to maintain a proper calcium-to-phosphorus ratio in our diets.
In summary, the newer phytase source provides not only greater releases of calcium
and phosphorus than previous sources, but also releases more amino acids and energy
levels which results in substantial improvements in economics to producers.