Ninety litters of ten kits were used to evaluate the effects of weaning age (21 vs 25 d) and weight (light vs heavy rabbits) and of increasing vegetal fat level in the weaning diet (ether extract 5.0% vs 6.5% DM) on productive performance and mortality of kits in the post weaning period (21 to 32 d). At 18 d, half litters received the diet G1 (EE: 5.0% DM; DE: 11.79 MJ/kg DM), the remaining half the diet G2 (EE: 6.5% DM; DE: 12.35 MJ/kg DM). Each litter was then divided into two cages, separating the five lightest kits (L) from the five heaviest ones (P).Within weaning diet, the litters were weaned at 21 (D21) or 25 d (D25) of age. The weaning age did not affect live weight at 25 d of age, while at 32 d the D21 rabbits were lightest compared to D25 ones (P<0.01). Feed intake from 21 to 32 d was higher in the earliest weaned rabbits, which also showed the less favourable feed conversion (P<0.01). The lightest rabbits at the beginning of the trial also showed the lower live weight at 32 d, with lower daily weight gain and feed ingestion.Therefore, the difference in weight measured at 21 d (57 g between L and P rabbits) increased at the end of the experimental period (79 g). Feed conversion was similar, while mortality was slightly higher (P=0.10) in L litters, with a final number of kits alive per litter equal to 4.93 vs 4.99 recorded in P litters. Nor live weight nor daily weight gain were affected by the dietary fat level, while feed intake was lower (P=0.02) in G2 litters. At the end of the trial, the number of kits alive per litter was lower in G2 litters (4.99 vs 4.93; P=0.09).
Destete precoz del conejo: efecto de la edad y del peso al destete y del nivel de grasa del alimento
XICCATO, GEROLAMO;TROCINO, ANGELA;SARTORI, ALBERTO;
2004
Abstract
Ninety litters of ten kits were used to evaluate the effects of weaning age (21 vs 25 d) and weight (light vs heavy rabbits) and of increasing vegetal fat level in the weaning diet (ether extract 5.0% vs 6.5% DM) on productive performance and mortality of kits in the post weaning period (21 to 32 d). At 18 d, half litters received the diet G1 (EE: 5.0% DM; DE: 11.79 MJ/kg DM), the remaining half the diet G2 (EE: 6.5% DM; DE: 12.35 MJ/kg DM). Each litter was then divided into two cages, separating the five lightest kits (L) from the five heaviest ones (P).Within weaning diet, the litters were weaned at 21 (D21) or 25 d (D25) of age. The weaning age did not affect live weight at 25 d of age, while at 32 d the D21 rabbits were lightest compared to D25 ones (P<0.01). Feed intake from 21 to 32 d was higher in the earliest weaned rabbits, which also showed the less favourable feed conversion (P<0.01). The lightest rabbits at the beginning of the trial also showed the lower live weight at 32 d, with lower daily weight gain and feed ingestion.Therefore, the difference in weight measured at 21 d (57 g between L and P rabbits) increased at the end of the experimental period (79 g). Feed conversion was similar, while mortality was slightly higher (P=0.10) in L litters, with a final number of kits alive per litter equal to 4.93 vs 4.99 recorded in P litters. Nor live weight nor daily weight gain were affected by the dietary fat level, while feed intake was lower (P=0.02) in G2 litters. At the end of the trial, the number of kits alive per litter was lower in G2 litters (4.99 vs 4.93; P=0.09).Pubblicazioni consigliate
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