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Effect of dietary type and level of fibre on carcass yield and its microbiological characteristics
Year:2008
Research Areas
  • Animal production
Information
Abstract
The aim of this trial was to study the effect of level and type of fibre during the last week of the fattening period on carcass characteristics. A total of 6602 New Zealand × Californian rabbits, weaned at 35 days of age, were fed with a commercial diet (C0: 35% of NDF, 13.4% of starch and soluble fibre, beet pulp as fibre source) from weaning to 56 days. The last week of fattening period (56-63d) animals were fed with three different diets (C0, C1 and C2). Diet C1, was formulated to have a similar NDF content as diet C0, but the fibre source was replaced by a more insoluble fibre (straw) and diet C2 was formulated to reduce the NDF to 32.4%, but keeping the same fibre sources as diet C1, and increasing the starch content (17.3%). Seven multi-floor cage rolling stand (MFRS) with 290 and 280 animals, were assigned to C0 and C1 diets, respectively, and other six MFRS (288 animals) to diet C2. In four animals per MFRS were determined the carcass yield. In two of them (14 animals/treatment) a sample of caecal content was taken to determine the same day the C. perfringens, Enterobacteriaceae, E. coli and Coliform counts. Temperature and pH in Biceps femoris were measured after the cold time (2 hours after slaughter at -1ºC) and 24 h post mortem and samples from the Longissimus dorsi and Biceps femoris were also taken to study the carcass bacteriological quality at days 1, 7 and 11 after slaughter (Total Aerobic, Enterobacteriae, Coliform and Coagulase-positive Staphylococcus). Animals fed with the lower dietary fibre content (C2) increased (P=0.05) its carcass yield. Carcass temperature was higher in the muscle of the animals fed diet C1 (P=0.001). The log cfu/g of Enterobacteriae, Coliform and Coagulase-positive Staphylococcus analysed in caecum content were higher for the animals fed treatment C1. The highest values of microorganisms content of the carcass were reached 11 days after slaughter (P<0.001). From these results, it might be concluded that a decrease of dietary fibre (from 35 to 32% NDF) when insoluble fibrous sources are included enhances the carcass yield and the carcass microbiological quality. For the same level of fibre, the inclusion of moderate amount of beet pulp (10%) improved the microbiological characteristics without impairing the carcass yield.
International
Si
Congress
9th World Rabbit Congress
960
Place
Verona (Italia)
Reviewers
Si
ISBN/ISSN
978-88-902814-6-4
Start Date
10/06/2008
End Date
13/06/2008
From page
1387
To page
1391
Proceedings of the 9th World Rabbit Congress
Participants
  • Autor: Rosa Maria Carabaño Luengo (UPM)
  • Autor: Nuria Nicodemus Martin (UPM)
  • Autor: Maria del Pilar Garcia Rebollar (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Producción Animal
  • Departamento: Producción Animal
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