Feeding programmes based on highly-digestible fibre weaning diets: Effects on health, growth performance and carcass and meat quality in rabbits
Pascual, M. | Soler, M.D. | Cervera, C. | Pla, M. | Pascual, J.J. | Blas, E.
The effect of three different dietary programmes on health, growth performance and carcass and meat quality in young rabbits weaned at 28d was studied using a diet (F) rich in highly-digestible fibre, from 17 to 63d of age (group FF); using diet F from 17 to 42d followed by a diet poor in highly-digestible fibre and rich in starch and fat (S) until 63d (group FS); and using a standard diet C with intermediate highly-digestible fibre and starch content, containing 100ppm of zinc-bacitracin, from 17 to 63d (group CC). A highly-digestible fibre diet could be useful to reduce the incidence of digestive disorders. However, it decreased slaughter weight (2294g in FF vs. 2406g in CC; P<0.05) and carcass and meat traits, e.g. dressing out percentage (55.4% in FF vs. 56.7% in CC; P<0.05), meat to bone ratio (5.73 in FF vs. 5.94 in CC; P<0.05) and hind leg fat content (3.81% in FF vs. 4.71% in CC; P<0.05) at 63d of age. Switching to a high starch and fat diet at late fattening improved chilled carcass weight at 63d of age (1339g in FS vs. 1263g in FF; P<0.05) mainly through the promotion of liver development (7.53% in group FS vs. 6.47% in group FF; P<0.05) and fat deposition (3.89% in FS vs. 2.63% in FF; P<0.05), and increased hind leg fat content (+1.2 points of fat percentage; P<0.05). However, this switch increased health risk (35.1% in FS vs. 17.6% in FF; P<0.05).
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