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Articles
by
Fenglan Yan |
Total Records (
1 ) for
Fenglan Yan |
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Zurong Wang
,
Sandro Cerrate
,
Cesar Coto
,
Fenglan Yan
and
P.W. Waldroup
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This study was conducted to evaluate the bioavailability
of an organic copper source, MINTREX® Cu, compared with reagent
grade Cu sulfate as a source of Cu in broiler diets. Nutritionally
complete basal diets were supplemented with either copper sulfate or
MINTREX Cu to provide diets with 0, 10, 25, 50, 125, 250 and 500 mg
kg-1 of supplemental Cu. Fifty commercial broiler strain (Cobb
500) male chicks were placed in each of 48 pens. Each diet (except for 500
mg kg-1) was fed to four replicate pens. The 500 mg
kg-1 level was fed to two replicate pens for each source. There
were two feeding phases including starter (0-21 d) and grower (21-35 d).
At the end of each phase, birds were weighed by pens and two birds per pen
(four birds per pen for the 500 mg kg-1 levels) were killed to
take liver and tibia samples for analysis of Cu concentration. Overall,
there was no effect of Cu source or dietary Cu concentration on feed
conversion or mortality. At 14 d the birds in the MINTREX treatment
weighed significantly more than the birds in the Cu sulfate treatment.
High Cu concentrations markedly decreased (p<0.0001) body weight
regardless of Cu sources in both phases. Elevated dietary Cu concentration
significantly increased (p<0.01) tibia ash Cu concentration for both Cu
sources in both phases; however there was no good linear relationship
between tibia Cu accumulation and non-zero Cu consumption. There were
marked effects (p<0.05) of Cu source, concentration and their
interaction on 14 d dry liver Cu concentration. Based on dry liver Cu
concentration regressed on non-zero copper consumption, the relative
bioavailability of MINTREX Cu was 111.63% for 14 d and 110.71% for 35 d
when bioavailability of reagent grade Cu sulfate was set as 100%. This
indicated that MINTREX Cu source has greater biological availability than
reagent grade Cu sulfate for broilers. |
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