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Performance, blood profile, carcass and meat traits and tissue morphology in growing rabbits fed mannanoligosaccharides and zinc-bacitracin continuously or intermittently

Y.A. Attia
Arid Land Agriculture Department, Faculty of Meteorology, Environment and Arid Land Agriculture, King Abdulaziz University, P.O. Box 80208, Jeddah 21589, Saudi Arabia
Abstract :
The study aimed at evaluation the effect of mannanoligosaccharides (MOS) and zinc-bacitracin
(ZnB) administered continuously (+) or intermittently (+/-) upon growing performance, carcass
and meat traits, blood profile and tissue morphology of growing rabbits. One hundred and twenty
five, 25 days-old rabbits were distributed among 5 groups fed the same basal diet: the control group
did not receive any supplements; MOS+ group fed mannanoligosaccarides at 0.083 g/rabbit/day;
MOS+/- group fed MOS at the same concentration as MOS+ group, but only two days/week; ZnB+
group received Zinc bacitracin at 0.083 g/rabbit/day; ZnB+/- group fed ZnB at the same level as
ZnB+ group but only two days/week. The experiment lasted from day 25 to 81 of life. The mortality
rate in the control group (36%) was higher (P<0.05) than in MOS+/- (12%) and ZnB+ groups (12%).
MOS and ZnB administered intermittently increased (P<0.01) dressing percentage as compared to
the control group. The liver percentage increased (P<0.01) due to use of MOS (+ or +/-) and ZnB
(+). ZnB (+ or +/-) increased (P<0.05) the protein percentage of meat as compared to the control
group, while the continuative administration of MOS was able to reduce (P<0.05) the fat percentage
as related to the control group. Both supplements and both administration protocols increased
(P<0.01) meat tenderness and water holding capacity in respect to the control group. Continuous
ZnB administration had deleterious effects on liver, kidney and ileum morphology. MOS could
replace ZnB from weaning to slaughter age of rabbits without negative effects on performance and
blood profiles causing no alterations in tissue morphology as compared to the control group. In
addition, the MOS can be administered intermittently, reducing the production costs.
Keywords :
blood profiles / growing and slaughtering performance / mannanoligosaccharide / rabbit / tissue morphology / zinc-bacitracin

Date Deposited : 02 Apr 2015 14:07

Last Modified : 02 Apr 2015 14:07

Official URL:

Volume 33, Number 1, - 2015

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