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Genetic and environmental effects on doe reproductive performance under desert condition

Authors
Publisher
(np)(place [np] (Egypt))
Publication Date
Keywords
  • Animal Husbandry
  • Environmental Temperature
  • Genetics
  • Rabbits
  • Reproductive Performance
  • Seasons

Abstract

Reproductive performance of 215 does of pure New Zealand White rabbits (NN), pure Californian (CC), two reciprocal crosses (NC& CN)و backcrosses ( BCn and BCc) and F2 crossbred were studied. Studied traits were litter Size at birth, 7, 14, 21 days of age and at weaning; litter birth weight average birth weight; gestation length; fertility rate; number of services per conception; parturition interval and mortality rate at 7, 14,21 days of age and at weaning. Doe genetic group effect was not significant for litter size and mortality rate, except for mortality rate at 7 days of age. The litter weight at birth varied between 407.4±21.6 and 323.6::18.2 g. the crossbred CN does had heavier litter weight at birth than other groups. The NC does crossbred had heavy average birth weight with increased mortality rate when compared with other genetic groups. The litter size at weaning was positively and highly correlated with litter size at birth. The crossbreeds were higher (than purebreds for NSC (P<0.05). Parturition intervals were similar for NN and CC breeds. The mortality rate was low in spring (warm season) and was high in winter (cold season) indicating that temperature may be important at the phase of young rabbits. Additive effect had a negative effect on the mortality rat at 21, days of age and at weaning. For mortality rate at 7 days direct heterosis had positively significant effect. However, litter size at birth was largely (1.0) rabbits when reared by NN vs CC dams. This difference increased to 1.2 rabbits at weaning Key words: reproductive traits, season, rabbit , crossbred, purebred.

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