Feed Management - November/December 2017 - 23
FeedManagement ❙ 23
Calcined caustic magnesia
(CCM) is produced by burning off
CO2 from magnesite (magnesium
carbonate), resulting in MgO.
Two factors affect the quality of
■ The temperature at which magnesium carbonate is exposed to
burn off (calcine) carbon dioxide.
■ The duration of time at which
magnesium carbonate is exposed
to that heat.
Both factors are optimized
when calcined in a Hershoff furnace, which results in the production of a highly reactive "light
burn" MgO (most bio-available)
versus a "harder burn" MgO (much
less bio-available) or a "deadburn" MgO (non-bio-available)
produced from furnaces with less
control of time and temperature.
A light burn MgO supplemented
to an animal's diet will typically
provide the best magnesium bioavailability and subsequent assimilation of Mg+ ions.
Magnesium reactivity, an indicator of animal bioavailability,
may be measured by a T-50 test
(measures reactivity under approximate constant pH conditions)
or a test of CMA (caustic magnesia
activity), which measures the time
required to neutralize a certain
amount of acetic acid.
MgO for hen skeletal
integrity, egg weight
The nutrient requirements of
minerals in broilers, layers or
turkeys have not been extensively
studied since the publication of
the last National Research Council
Nutrient Requirements of Poultry
in 1994. Recent trials with egg
strain pullets and layers and mixed
sex broilers suggest that the addition of Mg can improve performance and skeletal integrity.
A recent study conducted at The
Ohio State University suggests the
addition of highly reactive MgO in
a phytase-free diet increased body
weight in Hyline-36 pullets and
THE VACCINE FOR
From summer heat to winter frost, the ecology of a broiler house is constantly changing, which can lead to an
increased coccidiosis challenge. The precocious strains of HATCHPAK® COCCI III vaccine induce optimum immunity
with minimal lesions.1 So, at whatever level of coccidiosis challenge, your flock can be safely protected year round.
1 Data on file.
HATCHPAK® is a registered trademark of Merial. © 2017 Merial Select, Inc. Gainesville, Georgia.
All rights reserved. Merial is now part of Boehringer Ingelheim.
AV16-003A / HPC(02/17)