Thirty hybrid female rabbits of 15 weeks of age were at random divided into three groups and fed with one of the 3 following diets: "C diet" for young females (DE = 11.71 MJ/kg DM) fed ad libitum; "R diet" was the C diet fed at 80% of ad libitum, "F diet" rich in fiber (24.6% vs 18.7% for C diet; DE = 9.77 MJ/kg DM) fed ad libitum. The does were inseminated at the 19th weeks of age. The 3 diets were administered until the first parturition, afterwards all the does received the C diet ad libitum. Three pups per litter were slaughtered at birth, at 35d of age (weaning) and at 81d of age, respectively. At the second parturition, another pup per litter was slaughtered at birth. Ten minutes post mortem the Longissimus lumborum (LL) muscle of each slaughtered rabbit was sampled and then underwent the histochemical treatment: mean cross-sectional area (CSA), compactness index (CI) and sphericity (SPH) of the fibers of the new-born rabbits; percentage of the fiber types (βR, αR or αW) and CSA for rabbits of 35 and 81d of age. At birth all the fibers of LL muscle were typed as αR. The maternal feed restriction, applied as qualitative restriction (diet F) or quantitative restriction (diet R) significantly increased the CI of LL fibers of newborn rabbits of the first kindling, while maternal feed restriction effect was not evident on young of second kindling. At weaning, the young rabbits belonging to the first kindling exhibited an effect of maternal feed rationing on fiber type distribution. R diet, compared with F and C diets, significantly increased the percentage of βR fibers, while F diet significantly reduced the percentage of αR fibers. The greatest effect of maternal feed restriction on weaning rabbit was observed on the percentage of αW fibers (P<0.01), which was the highest for F diet (85.2%), intermediate for C diet (78.0%) and the lowest for R diet (71.8%). At 81d of age, no effect of maternal dietary treatment was found on offspring.

Effect of maternal feed restriction on metabolic and contractile properties of muscle fibres of rabbit offspring

DALLE ZOTTE, ANTONELLA;
2004

Abstract

Thirty hybrid female rabbits of 15 weeks of age were at random divided into three groups and fed with one of the 3 following diets: "C diet" for young females (DE = 11.71 MJ/kg DM) fed ad libitum; "R diet" was the C diet fed at 80% of ad libitum, "F diet" rich in fiber (24.6% vs 18.7% for C diet; DE = 9.77 MJ/kg DM) fed ad libitum. The does were inseminated at the 19th weeks of age. The 3 diets were administered until the first parturition, afterwards all the does received the C diet ad libitum. Three pups per litter were slaughtered at birth, at 35d of age (weaning) and at 81d of age, respectively. At the second parturition, another pup per litter was slaughtered at birth. Ten minutes post mortem the Longissimus lumborum (LL) muscle of each slaughtered rabbit was sampled and then underwent the histochemical treatment: mean cross-sectional area (CSA), compactness index (CI) and sphericity (SPH) of the fibers of the new-born rabbits; percentage of the fiber types (βR, αR or αW) and CSA for rabbits of 35 and 81d of age. At birth all the fibers of LL muscle were typed as αR. The maternal feed restriction, applied as qualitative restriction (diet F) or quantitative restriction (diet R) significantly increased the CI of LL fibers of newborn rabbits of the first kindling, while maternal feed restriction effect was not evident on young of second kindling. At weaning, the young rabbits belonging to the first kindling exhibited an effect of maternal feed rationing on fiber type distribution. R diet, compared with F and C diets, significantly increased the percentage of βR fibers, while F diet significantly reduced the percentage of αR fibers. The greatest effect of maternal feed restriction on weaning rabbit was observed on the percentage of αW fibers (P<0.01), which was the highest for F diet (85.2%), intermediate for C diet (78.0%) and the lowest for R diet (71.8%). At 81d of age, no effect of maternal dietary treatment was found on offspring.
2004
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/1476699
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