Evaluation of application of the intensive rabbit production system under the sub-tropical conditions of Egypt

MS Ayyat, IFM Marai - World Rabbit Science, 1998 - riunet.upv.es
MS Ayyat, IFM Marai
World Rabbit Science, 1998riunet.upv.es
[EN] The study included 747 litters obtained from 173 New~ aland White (NZW) does, during
one calendar year. Mating was 1rried out at the start of the breeding season (October), then
on the 1cond day after kindling. Pregnancy diagnosis was carried out ten 1ys after service
and the empty does were rebred in the sama day. 1e results showed that the highest
percentage of litters carne from atings carried out within the first ten days after kindling
(55.4%), llowed by those matad> 30 days (18.1%), 11-20 days (14.7%) id 21-30 days …
[EN] The study included 747 litters obtained from 173 New ~aland White (NZW) does, during one calendar year. Mating was 1rried out at the start of the breeding season (October), then on the 1cond day after kindling. Pregnancy diagnosis was carried out ten 1ys after service and the empty does were rebred in the sama day. 1e results showed that the highest percentage of litters carne from atings carried out within the first ten days after kindling (55.4%), llowed by those matad> 30 days (18.1%), 11 - 20 days (14.7%) id 21 - 30 days (11.9%) after kindling. The effects of open days amating interval) on most of the studied traits were not significant. 1e average theoretical number of litters/year (classified according to ndling intervals) was 8.7. The study of the litter size showed that 5 - kits was the most frequent size (47.5%), followed by~ 8 (28.4%) and :s; 4 (24.1%) kits/litter. The traits which were significantly (P<0.001) correlated with litter size were milk yield, milk intake and milk conversion ratio, kit's weight at birth and at weaning and kit's weight gain. The highest litter size (~8) was accompanied by the highest milk yield (148 g/d) and the lowest individual milk intake per day (20.9 g), kit's weight at birth (61.5 g) and at weaning (443 g), kit's weight gain (13.6 g/d) and milk conversion ratio (1.5 g milk/g galn). Average litter size at birth was 6.4. Year season effect showed that the highest percentage of litters was recordad in autumn (32.8%), followed by spring (30.4%), winter (24.4%) and summer (12.4%). The effects of year season on most of the studied traits were significant. lnteractions between main factors were not significant on most of the studied traits.
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