Feed Management - November/December 2017 - 25
FeedManagement ❙ 25
percent heavier eggs (61.9 grams vs.
61.2 grams; P=0.071) during the last
lay cycle (33 to 36 weeks of age).
off at 2 pounds MgO/ton. The differences in the maximal responses
of the variables measured (body
weight, feed conversion, tibia bone
ash, tibia breaking strength, GSHpx)
suggest that the Mg "requirements"
may differ for each system and
change with age.
MgO improves broiler
Highly reactive MgO added to
broiler diets increased body weights
and improved feed conversion in
42- and 49-day broiler ﬂoor pen trials conducted at a private research
In the first trial, 42-day body
weight and tibia ash and breaking
strength were significantly increased
and feed conversion improved by
Broilers fed diets containing phytase suggest that their performance
to 42 days of age may be optimized
with the addition of 2 to 3 pounds of
highly reactive MgO/ton of feed,
while it appears that adding 3- to
4-pounds MgO/ton of feed may be
needed to maximize bone strength.
Supplemental Mg positively affected performance in the second
trial with the addition of 1.5- to
2-pounds MgO/ton giving improvements on 49-day body weight (70
g.; 2.7 percent), feed conversion (3.0
points; 1.5 percent) and tibia bone
ash (7+ percent).
Livability was significantly improved in the 42-day broiler trial by
added dietary Mg, but not in the second trial. Blood glutathione peroxidase (GSH px) levels were measured
in trial 2 and increased in a linear
manner compared with the negative
control with the response leveling
November/December 2017 ❙ www.WATTAgNet.com
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