World Rabbit Science - Vol. 13 (2)-2005

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https://riunet.upv.es/handle/10251/9522

Tabla de contenidos



  • Letter from the Editor in Chief
  • Guidelines for the handling of rabbit bucks and semen.
  • Nitrate Detoxification of drinking water by ascorbic acid in growing rabbits.
  • The use of a stochastic model of rabbit growth for culling.
  • Reproductive efficiency of female German Angora Rabbits under Indian sub-temperate climatic conditions.
  • Abstracts of the Main Papers presented during the 8th World Rabbit Congress
  • Abstracts of the Welfare and Ethology presented during the 8th World Rabbit Congress.


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Recent Submissions

Now showing 1 - 5 of 7
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    Letter from the Editor in Chief
    (Universitat Politècnica de València, 2010-07-07) Pascual Amorós, Juan José; Departamento de Ciencia Animal; Instituto Universitario de Ciencia y Tecnología Animal; Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural
    [EN] Abstract not available.
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    Abstracts of the Main Papers presented during the 8th World Rabbit Congress, Puebla, Mexico 7-10, 2004
    (World Rabbit Science. ICTA. UPV, 2005) World Rabbit Science
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    Publication
    Reproductive efficiency of female German Angora Rabbits under Indian sub-temperate climatic conditions
    (World Rabbit Science. ICTA. UPV, 2005) Kumar, D.; Singh, U.; Bhatt, R.S.; Risam, K.S.
    [EN] The influence of season, parity, age and weight of doe at service on the reproductive efficiency of female German Angora rabbits has been studied. Nulliparous German Angora rabbits of 4 - 5 months of age were imported from Germany in August, 1997 and reared under standard management practices. They subjected to an extensive breeding system (re-mating after weaning). The kits were weaned 42 days after kindling. The data from the reproduction records of 149 does, consisting of 398 matings and 238 kindlings during a period of five years, (1998 to 2002) were analyzed. The parameters considered were fertility rate, litter size at birth (LSB), litter weight at birth (LWB), litter size at weaning (LSW), gestation length and sex ratio. The overall fertility percentage, LSB, LWB (g), LSW (g), gestation length (d) and sex ratio percentage were 61.18, 4.89, 253.88, 4.44, 31.95 and 53.94, respectively. The season of the year had a significant (P#0.05) effect on LSB, LWB, LSW and gestation length, with higher values of LSB, LWB and LSW in spring. The fertility rate was significantly higher (P#0.05) for the females of 1 to 2 years of age. Spring appears to be the most favorable season for efficient reproduction of German Angora rabbits under the sub-temperate climatic conditions found in India.
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    The use of a stochastic model of rabbit growth for culling
    (World Rabbit Science. ICTA. UPV, 2005) Sampaio, I.B.M.; Ferreira, W.M.; Bastos, A.F.; Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brasil
    [EN] A stochastic modeling approach was used to detect at an early stage in their growth the individuals with the best growth performance. The procedure can be helpful for culling purposes or to check if an animal is growing according to a regular pattern. The stochastic model can be based on any known rabbit growth curve but its parameters should be historically chosen in relation to the breed being raised. In this study five New Zealand White females randomly chosen from different litters were weighed weekly from birth to reproduction age (154 days). A Gompertz growth curve showed best fit to the data. Historical information on New Zealand White and average birth weight from current data were used to define the model Wt* = 51 exp { 0.113 [1-exp(-0.026 t)] / 0.026}, where Wt* is the estimated animal weight in g on day t. The stochastic approach is very effective, as it requires the true weight obtained in the last measurement (Wt-1) and provides the expected weight value for age t, E(Wt)= Wt*[(Wt-1)/ (W*t-1)]0.8. When a rabbit at age t shows real weight Wt > E(Wt), it means it is an above average animal and can be used for culling purposes. In following the growth of a given animal, when the above inequality shows consistence in sequential ages and then abruptly changes, it is supposed that some source (probably external) affected its growth and is a signal that some action needs to be taken.