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

• Autores: M.S. Ayyat, I.F.M. Marai
• Localización: World Rabbit Science, ISSN-e 1989-8886, ISSN 1257-5011, Vol. 6, Nº. 1, 1998, págs. 213-217
• Idioma: inglés
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• Resumen

  • The study included 747 litters obtained from 173 New Zealand White (NZW) does, during one calendar year. Mating was carried out at the start of the breeding season (October), then on the second day after kindling. Pregnancy diagnosis was carried out ten days after service and the empty does were rebred in the some day. The 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%) 1d 21 - 30 days (11.9%) after kindling. The effects of open days amating interval) on most of the studied traits were not significant. The average theoretical number of litters/year (classified according to kindling 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: ≤ 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.