Constitution and evaluation of a long-lived productive rabbit line1

Sánchez, Juan Pablo; Theilgaard, P.; Mínguez, C.; Baselga, M.

doi:10.2527/jas.2007-0217

Cited by 48 publications

(74 citation statements)

References 20 publications

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“…However, the V does produced significantly larger litters at third partum (+1.88 kits total born and +1.20 kits born alive) in unconstrained conditions (NC). These values are in agreement with a large-scale study (>200 does per line; Sánchez et al, 2008) that reported higher total born (+0.74 kits), born alive (+0.77 kits) and weaned kits (+0.54) during the first three partum for V does as compared with LP does. The main differences between LP and V does in the NC environment were observed in the evolution of DE intake, milk yield and PFT.…”

Section: Genetic Differences In Nc Environmentsupporting

confidence: 91%

“…A total of 164 rabbit females started the trial, 85 from line LP and 79 from line V. The LP line was founded on reproductive longevity criteria by selecting females from commercial farms (indistinctively of its origin; i.e. purebreed or crossbreed of synthetic lines) that had a minimum of 25 partum with more than 7.5 kits born alive per partum (more details of the LP line constitution are given in Sánchez et al, 2008) and then selected by litter size at weaning for the subsequent six generations. Line V was constituted from four specialised maternal lines into a composite synthetic line and then selected by litter size at weaning (Estany et al, 1989) for 36 generations.…”

Section: Animalsmentioning

confidence: 99%

“…These variations were present in the commercial rabbit farms of Portugal and Spain where female rabbits used to establish the LP line came from (Sánchez et al, 2008). This may explain the greater robustness (Theilgaard et al, 2007 and) and the extended reproductive lifespan of LP does (Sánchez et al, 2008).…”

Section: Genetic Differences In Hc Environmentmentioning

confidence: 99%

“…This seems to be the case of a maternal rabbit line, called LP, founded by selecting female rabbits of extremely long longevity and a minimum acceptable litter size from a large set of Spanish and Portuguese commercial farms (Sánchez et al, 2008). Does from line LP were characterised by having an extended lifespan (Sánchez et al, 2008), a later reproductive senescence (Theilgaard et al, 2007) and a greater adaptability to maintain the productive level in the face of nutritional constraints (Theilgaard et al, 2009), compared with a maternal line exclusively founded and subsequently selected for reproductive intensity (line V; Estany et al, 1989).…”

Section: Introductionmentioning

confidence: 99%

“…Does from line LP were characterised by having an extended lifespan (Sánchez et al, 2008), a later reproductive senescence (Theilgaard et al, 2007) and a greater adaptability to maintain the productive level in the face of nutritional constraints (Theilgaard et al, 2009), compared with a maternal line exclusively founded and subsequently selected for reproductive intensity (line V; Estany et al, 1989). The advantages of LP does were dependent on specific conditions (environmental restriction or high reproductive effort) and seem to be related to the use of their greater soma (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Environmental sensitivity differs between rabbit lines selected for reproductive intensity and longevity

Savietto

Cervera

Blas

et al. 2013

Animal

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To better understand the mechanisms that allow some animals to sustain their productive effort in harsh environmental conditions, rabbit does from two selection lines (LP and V) were housed in normal (NC), nutritional (NF) or heat (HC) challenging environmental conditions from first to third partum. The LP line (n = 85) was founded on reproductive longevity criteria by selecting does from commercial farms that had a minimum of 25 partum with more than 7.5 kits born alive per parity. Line V (n = 79) was constituted from four specialised maternal lines into a composite synthetic line and then selected by litter size at weaning for 36 generations. Female rabbits in NC and NF environments were housed at normal room temperature (18°C to 24°C) and fed with control [11.6 MJ digestible energy (DE)/kg dry matter (DM)] or low-energy diets (9.1 MJ DE/kg DM). HC does were housed at high room temperatures (25°C to 35°C) and fed the control diet. Female rabbits in the HC and NF environments ingested 11.5% and 6% less DE than NC does, respectively ( P < 0.05). These differences between environments occurred in both lines, with the differences being higher for LP than for V does (+6%; P < 0.05). Milk yield responses followed those of energy intake also being higher for LP does (+21.3 g/day; P < 0.05). The environmental conditions did not affect the perirenal fat thickness (PFT), but a genotype by environment interaction was observed. In NC and HC, the PFT was higher for line V (+0.23 and +0.35 mm, respectively; P < 0.05) than for LP does, but this was not the case at NF (−0.01 mm). Moreover, the PFT evolution was different between them. In the NC environment, LP does used the accreted PFT in late lactation (−0.29 mm), whereas V does did not (−0.08 mm). Conversely, in the HC environment, LP does showed a flat PFT evolution in late lactation, whereas V does accumulated PFT. In the NF environment, LP and V does had a similar PFT evolution. There was also a litter size reduction for V does of −2.59 kits total born in HC and −1.78 kits total born in NF environments, whereas this was not observed for LP does. The results for LP does indicate a direct use of DE ingested for reproduction with little PFT change, whereas V does actively use the PFT reserves for reproduction.

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Section: Genetic Differences In Nc Environmentsupporting

confidence: 91%

Section: Animalsmentioning

confidence: 99%