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Long-term effect of selection for litter size and feeding programme on the performance of reproductive rabbit does 1. Pregnancy of multiparous does

Published online by Cambridge University Press:  09 March 2007

F. Quevedo ,
C. Cervera ,
E. Blas ,
M. Baselga  and
J. J. Pascual
F. Quevedo
Affiliation:
Departamento de Ciencia Animal, Universidad Politécnica de Valencia, 46071 Valencia, Spain
C. Cervera
Affiliation:
Departamento de Ciencia Animal, Universidad Politécnica de Valencia, 46071 Valencia, Spain
E. Blas
Affiliation:
Departamento de Ciencia Animal, Universidad Politécnica de Valencia, 46071 Valencia, Spain
M. Baselga
Affiliation:
Departamento de Ciencia Animal, Universidad Politécnica de Valencia, 46071 Valencia, Spain
J. J. Pascual*
Affiliation:
Departamento de Ciencia Animal, Universidad Politécnica de Valencia, 46071 Valencia, Spain
*
†Corresponding author: Email: jupascu@dca.upv.es
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Abstract

A total of 166 crossbred does were used to study the possible long term effect of two types of crossbred does (H1 v. H2, old and current generations, respectively) from the cross of different generations of lines selected for litter size, the use of a feeding programme based on a low-energy diet during the rearing and the administration of a high-energy diet during reproductive life, on the performance and body condition of multiparous pregnant does. Selection did not affect the live weight (LW) of does at the effective artificial insemination (AI; 4257 g), the LW change (+12·3 g/day) and food intake (172 g dry matter (DM) per day) until the 28th day of pregnancy. However, H2 does showed greater LW losses during the pre-partum period than H1 does (120+g; P<0·05), perhaps related to their higher prolificacy (+1·1 total pups born; P<0·05). H2 does showed a higher perirenal fat thickness (PFT) at first AI (+0·12 mm; P<0·05) than H1 does, these differences disappearing at effective AI. Females given a high-energy reproduction diet showed a lower LW at effective AI than those receiving a medium-energy diet (4210, 4305 g, respectively; P<0·05). However, type of reproduction diet did not affect the LW and PFT changes of pregnancy does, reaching partum with a similar PFT (8·83 v. 8·93 mm) and maintaining the differences in LW. Pregnant does given high-energy diet consumed 20 g DM and 1·4 g digestible protein per day less than does receiving medium-energy diet until the 28th day of pregnancy, but their digestible energy (DE) intake was significantly higher (+78 kJ DE per day; P<0·05). Does given high-energy diet showed a significantly lower litter size at birth (−0·7 pups; P<0·05), although there were no significant differences in the number of pups born alive (9·54 and 9·76 pups for high and medium-energy diets, respectively). Pups from does given high-energy diet were slightly weightier than those from medium-energy diet (+5·4 g; P<0·05). Multiparous pregnant does that received a low-energy diet ad libitum during the rearing period and first pregnancy showed a higher LW at effective AI (+137 g LW; P<0·05) but a lower PFT (−0·26 mm; P<0·05) than those females that received a medium-energy diet restricted during this same period. These differences were maintained at parturition (+142 g LW and −0·20 mm; P<0·05). Feeding programme during rearing affected neither the food intake of multiparous pregnant does until the 28th day of pregnancy, nor the litter size and weight at birth. The interval between parturitions was not affected by the selection for litter size or the reproduction diet received, but was longer for does that received the low-energy diet ad libitum during the rearing period (+2·9 days; P<0·05). In conclusion, rabbit selection programmes by litter size seem to be working well, but high energy reproduction diets, frequently used to cover their higher energy requirements, must be used carefully out of lactation in the long term to avoid a reduction in litter size.

Keywords

body conditionnutrition programmeslitter sizepregnancyrabbitsselection
Type
Research Article
Information
Animal Science , Volume 82 , Issue 5 , October 2006 , pp. 739 - 750
Copyright
Copyright © British Society of Animal Science 2006

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