Effect of supplementation with β-glucan of Saccharomyces cerevisiae and chito-oligosaccharides on digestion and growth performance in weanling rabbits

Guenaoui Mohamed
Dr. Javier Garcia Alonso (dir.) ; Dra. Rosa Carabaño Luengo (dir.)

Universidad de Zaragoza, VET, 2015
Producción Animal y Ciencia de los Alimentos department,

Máster Universitario en Nutrición Animal

Abstract: The aim of this work was to study the effect of yeast β-glucans and chito-oligosaccharides supplementation on digestion and growth performance of growing rabbits. Five experimental diets were prepared. A control diet was formulated with 18.1% protein, 33.1% neutral detergent fibre and 13% soluble fibre (on DM basis). Another four diets were obtained by supplementing control diet with β-glucans (200 or 400 ppm. BG2 and BG4) and chito-oligosaccharides (200 or 400 ppm. OT2 and OT4). No antibiotic was used. In the first experiment, 56 rabbits / treatment weighing 510 ± 73.0g weaned at 28 d of age were used to record mortality, and in 42 rabbits / treatment growth traits were recorded. Rabbits fed control, BG4 and OT4 diets (42/treatment), were used to determine the body composition by bioelectrical impedance technique measured at 28, 38 and 63 d of age. Experimental diets were offered from weaning up to 38 d of age. At this moment all rabbits were fed the control diet up to 63 d of age. Another group of 24 rabbits / treatment received from 28 to 38 d of age the five diets containing mordanced ytterbium. They were slaughtered at 38 d of age and ileal digesta collected to quantify ileal digestibility and caecal pH recorded. Faecal digestibility was measured from 36 to 38 d of age (9rabbits/diet). In the second experiment, three hundred thirty-four rabbits were separated from their mothers at 19 d of age (329 ± 65g) and assigned to the control, BG4 and OT4 diets. Rabbits suckled every morning for 10 minutes until 28 d of age. After weaning at 28 d of age, two hundred thirty-one rabbits received the same experimental diets than in the first period (77 rabbits per diet) and were caged individually to determine growth performance. At 19 d of age, 10 rabbits from 10 different litters were slaughtered to determine the digestive parameters (relative weight of total digestive tract, stomach and caecum ).At 27 and 38 d of age 30 rabbits(3 rabbits/treatment and litter) from each of the same 10 litters which have been chosen before (at 19 d of age) were slaughtered to determine the same measurements. Diet supplementation with β-glucans and chito-oligosaccharides did not affect ileal and faecal DM digestibility and faecal digestibility of fat, protein and fibre. Similarly, no treatment effect was found on growth traits along fattening period in the two experiments. In the first experiment, the mortality increased in rabbits supplemented with 200 ppm β-glucans compared to 400 ppm β-glucans (P = 0.048).In the second experiment, the mortality rates were lower than in the first one, and there were no other effect of treatments. The type of diet did not modify the retention and efficiency of both nitrogen and energy in the whole animal or in the carcass. However, rabbits fed supplemented diets with chito-oligosacchharides showed a higher faecal excretion of nitrogen (P=0.034) and energy (P=0.076) between 28 and 38d of age. Treatments had no effect on the relative weight of digestive organs. In conclusion, in our condition the supplementation of β-glucans and chito-oligosaccharides does not provide any advantage to growing rabbits.

Tipo de Trabajo Académico: Trabajo Fin de Master

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