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Effect of weaning diet and weaning age on growth, body composition and caecal fermentation of young rabbits

Published online by Cambridge University Press:  18 August 2016

G. Xiccato ,
A. Trocino ,
A. Sartori  and
P. I. Queaque
G. Xiccato*
Affiliation:
Department of Animal Science, University of Padova, Agripolis, 35020 Legnaro (PD), Italy
A. Trocino
Affiliation:
Department of Animal Science, University of Padova, Agripolis, 35020 Legnaro (PD), Italy
A. Sartori
Affiliation:
Department of Animal Science, University of Padova, Agripolis, 35020 Legnaro (PD), Italy
P. I. Queaque
Affiliation:
Department of Animal Science, University of Padova, Agripolis, 35020 Legnaro (PD), Italy
*
E-mail:gerolamo.xiccato@unipd.it
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Abstract

Two weaning diets (C and S) and three weaning ages (21, 25, and 28 days) were compared in a two factorial arrangement to evaluate their effect on growth performance, body composition and caecal fermentation activity of young rabbits. One hundred litters born the same day from multiparous does were used. Sixty litters were early weaned at 21, 25 and 28 days of age (20 litters per weaning age), put in collective cages (nine kits per cage) (W21, W25, and W28 litters) and offered the control diet C (crude protein (CP) : 175 g/kg dry matter (DM); ether extract : 20 g/kg DM; starch : 157 g/kg DM; acid-detergent lignin (ADL) : 60 g/kg DM; digestible energy (DE) : 11·08 MJ/kg DM) or the starter diet S (CP : 173 g/kg DM; ether extract : 41 g/kg DM; starch : 112 g/kg DM; ADL : 51 g/kg DM; DE : 11·31 MJ/kg DM). At 32 days of age, 180 early weaned rabbits (three rabbits from each of the 60 litters above) were selected : 60 animals were slaughtered; 120 animals were placed into individual cages and offered a fattening diet (CP : 166 g/kg DM; ether extract : 23 g/kg DM; starch : 177 g/kg DM; ADL : 49 g/kg DM; DE : 11·26 MJ/kg DM) from 32 to 56 days of age. At 56 days of age, another 60 representative rabbits were slaughtered. The administration of diet S to the early weaned rabbits increased litter weight at 32 days (6160 v. 6027 g; P <005) and gain to food ratio from weaning to 32 days (752 v 666 g/kg; P <0001) compared with diet C. Moreover, empty bodies (EB) of S rabbits were fatter (fat : 45 v. 41 g/kg; P = 001) and had greater energy content (5·92 v 5·71 MJ/kg; P <001). At 56 days of age, no residual effect of the diet was recorded. Weaning age affected growth performance, body composition and caecal fermentation at 32 days of age : EB weight (P <005) and EB protein concentration increased (from 164 to 168 g/kg, P <0·01) while caecal volatile fatty acid concentration decreased (from 71·7 to 53·8 mmol/l; P <0·01) when weaning age was increased from 21 to 28 days. At 56 days of age, no effect (P > 0·05) of weaning age was recorded on growth performance or caecal fermentation traits, but EB protein remained lower in the earliest weaned rabbits (P <0·05). In conclusion, feeding a high-fat low-starch diet to early weaned rabbits stimulated growth and body fat and energy retention of kits at 32 days of age with no effect on caecal fermentation. The early weaning successfully performed at 21 days of age strongly stimulated caecal fermentation but reduced body protein reserves.

Keywords

age at weaningbody compositioncaecal fermentationrabbitsweaning diet
Type
Non-ruminant nutrition, behaviour and production
Information
Animal Science , Volume 77 , Issue 1 , August 2003 , pp. 101 - 111
Copyright
Copyright © British Society of Animal Science 2003

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