World Rabbit Science - Vol. 10 (3)-2002

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  • EFFECT OF DIVERGENT SELECTION FOR UTERINE CAPACITY ON PROGESTERONE, ESTRADIOL AND CHOLESTEROL LEVELS AROUND IMPLANTATION TIME IN RABBITS.
  • EFFICACY OF TWO GONADOTROPHINS ON RECEPTIVITY OF COMMERCIAL DOES.
  • NON GENETIC FACTORS AFFECTING RABBIT REPRODUCTION IN ALGERIA
  • OPPORTUNITIES FOR RABBIT RESEARCH AND HUMAN DEVELOPMENT IN THE WESTERN HEMISPHERE: A RABBIT REVOLUTION?
  • Abstract of papers presented during the 27th SYMPOSIUM of the Asociación Española de Cunicultura.
  • LETTER TO THE EDITOR. CUNICULUS 'RABBIT' - A CELTIC ETYMOLOGY


URI permanente para esta colecciónhttps://riunet.upv.es/handle/10251/9967

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    Item type: Artículo , Access status: Abierto ,
    LETTER TO THE EDITOR. CUNICULUS 'RABBIT' - A CELTIC ETYMOLOGY
    (World Rabbit Science. ICTA. UPV, 2002) Ballester, X.; Quinn, R.
  • Miniatura
    Item type: Artículo , Access status: Abierto ,
  • Miniatura
    Item type: Artículo , Access status: Abierto ,
    OPPORTUNITIES FOR RABBIT RESEARCH AND HUMAN DEVELOPMENT IN THE WESTERN HEMISPHERE: A RABBIT REVOLUTION?
    (World Rabbit Science. ICTA. UPV, 2002) LUKEFAHR, S.D.
    [EN] Throughout the Western Hemisphere, opportunities exist to develop viable rabbit research programs that meet the unique needs of small-scale, limited-resource farmers. In this paper, basic problems of small-scale farmers are first briefly described, and, secondly, pre seflt examples are provided of alternative and innovative research programs that direclly address these special needs. Rabbit scientists are further encouraged to elevate the stature of the rabbit as a significant "niche" livestock species to benefit humanity through the expansion of sustainable, small-scale rabbit farming and (or) development projects.
  • Miniatura
    Item type: Artículo , Access status: Abierto ,
    NON GENETIC FACTORS AFFECTING RABBIT REPRODUCTION IN ALGERIA
    (World Rabbit Science. ICTA. UPV, 2002) Belhadi, S.; Boukir, M.; Amriou, L.
    [EN] Environmental variability of reproductive traits has been investigated on a pool of 51 does of different origin in a rabbit breeding unit in Tizi Ouzou region. The objective was to estimate the effects of different factors su ch as kindling season, parity, physiological state of does, and number born alive on characters such as acceptation rate, conception and kindling rate by female, total born alive, stillborn, litter size at weaning, pre-weaning and post-weaning mortality and weekly litter weights from birth to weaning. Mean bunny weight at birth, at weaning and 70 days of age, litter weight at 70 days of age and total litter gain during lactation have also been considered. Results show that kindling season affects only litter size at weaning with favourable effect of autumn and spring (7.8 vs 6.6). Highest mean weights at birth are recorded in autumn (16.2 g more than others) and highest litter weights at weaning during the three seasons other than summer (700 g more). The highest mean weight at 70 days is obtained in winter (1.9 Kg). For parity effect, we have recorded the greatest conception and kindling rates at !he beginning of reproductive life (98.7 and 96.03% respectively). Other performances did not vary according to this factor. Lactating females at mating had the same acceptation, conception and kindling rate and similar litter sizes as no lactating; however, superior values were obtained for non lactating does for litter size. Moreover, differences dueto effect of number born alive on weekly mean weights were significant. However, this effect fades down at 70 days of age.
  • Miniatura
    Item type: Artículo , Access status: Abierto ,
    EFFICACY OF TWO GONADOTROPHINS ON RECEPTIVITY OF COMMERCIAL DOES
    (World Rabbit Science. ICTA. UPV, 2002) Alfonso, M.; Pagés-Mantè, A.
    [EN] The efficacy of two commercial gonadotrophins (PMSG) on sexual receptivity of 1104 does was compared in a field tria!. The two gonadotrophins were tested in alternate 8 weekly groups (4 Foligon*; 4 Gonaser*). Does that allowed the male to mate were considered as receptive. Does treated with different PMSG were equally receptive (Foligon* 94.5% vs Gonaser* 95.1%).
  • Miniatura
    Item type: Artículo , Access status: Abierto ,
    EFFECT OF DIVERGENT SELECTION FOR UTERINE CAPACITY ON PROGESTERONE, ESTRADIOL AND CHOLESTEROL LEVELS AROUND IMPLANTATION TIME IN RABBITS
    (World Rabbit Science. ICTA. UPV, 2002) Mocé, M.L.; Santacreu, M.A.; Climent, A.; Ministerio de Ciencia y Tecnología
    [EN] The effects of selection for high (H) and low (L) uterine capacity on serum and uterine fluid levels of progesterone and serum levels of estradiol and cholesterol, near implantation (day 6 of gestation), were studied. Both lines had similar ovulation rates (15.2 vs 14.4), but different number of embryos (12.8 vs 11.0; P<0.05) for H and L, respectively. Progesterone, cholesterol and estradiol were similar in both lines (9.3 and 9.6 ng/ml serum progesterone; 15.6 and 13. 7 ng/ml of uterine fluid progesterone; 28.1 and 27.6 pg/ml of estradiol; and 66.6 and 68.0 mg/dl of cholesterol for H and L, respectively). Lactation strongly affected the variables studied. Lactating does had higher ovulation rates than non-lactating (15.6 vs 14.0; P<0.05), but no differences were detected for the number of embryos recovered (12.2 and 11.6 for lactating and non-lactating, respectively) or for embryo survival (O. 79 and 0.84 for lactating and non-lactating). L does had lower levels of serum progesterone (8. 7 ng/ml), uterine fluid progesterone (13.0 ng/ml) and serum cholesterol (59.3 mg/dl) than non-lactating females (10.2 ng/ml, 16.3 ng/ml and 75.3 mg/dl respectively; P<0.05). Lactation did not affect serum levels of estradiol. Serum progesterone levels were slightly correlated with ovulation rate (r=0.24; P<0.05). Ovulation rate and number of embryos recovered were correlated with progesterone uterine fluid in lactating females (r=0.55 and 0.49 respectively; P<0.05). Embryo survival in lactating females was negatively correlated with the concentration of estradiol (r=-0.39; P<0.05).