Revistas UPV. Editorial UPV

Permanent URI for this community

https://riunet7pre.upv.es/handle/10251/8702

Desde esta comunidad se tiene acceso a artículos en texto completo de publicaciones periódicas editadas por diferentes unidades académicas de la Universitat Politècnica de València (UPV) gestionadas en la plataforma OJS a través del portal Polipapers

Browse

Browsing Revistas UPV. Editorial UPV by Sponsor "Agence Nationale pour le Développement de la Recherche Universitaire, Argelia"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Publication
    A generalized coincidence point index
    (Universitat Politècnica de València, 2005-04-01) Benkafadar, N.M.; Benkara-Mostefa, M.C.; Agence Nationale pour le Développement de la Recherche Universitaire, Argelia; Ministère de l'Enseignement Supérieur et de la Recherche Scientifique, Argelia
    [EN] The paper is devoted to build for some pairs of continuous single-valued maps a coincidence point index. The class of pairs (f, g) satisfies the condition that f induces an epimorphism of the Cech homology groups with compact supports and coefficients in the field of rational numbers Q. Using this concept one defines for a class of multi-valued mappings a fixed point degree. The main theorem states that if the general coincidence point index is different from {0}, then the pair (f, g) admits at least a coincidence point. The results may be considered as a generalization of the above Eilenberg-Montgomery theorems [12], they include also, known fixed-point and coincidence-point theorems for single-valued maps and multi-valued transformations.
  • Thumbnail Image
    Publication
    Oestrus induction in primiparous lactating rabbits by a 48 hours mother-litter separation: endocrine and behavioural responses
    (Editorial Universitat Politècnica de València, 2013-10-01) Ilès, I.; Benazzoug, Y.; Messili, A.; Boukhari, S.; Boiti, C.; Agence Nationale pour le Développement de la Recherche Universitaire, Argelia
    [EN] Primiparous does express low mating acceptance during lactation and different oestrus induction methods are employed to improve sexual receptivity. The aim of this work was to study the effect of a biostimulation, a 48 h doe-litter separation (DLS), in primiparous lactating rabbits on mating acceptance, external characteristics of the vulva and plasma concentrations of estradiol, testosterone, progesterone and cortisol. Seventy primiparous does from local population were divided on day 1 after kindling into 2 equal groups: control (C, n=35), where does always had free access to the nest-box, and DLS (n=35), where free suckling was adopted, except from day 9 to day 11 post-partum (PP). Litter size was equalised to 6-7 kits. Before mating, blood samples were obtained from 10 does per group on 9th and 11th d post-partum (dpp). The results showed that the DLS treatment improved the mating acceptance on 11th dpp (88.5 vs. 54.2%; P<0.01) and the frequency of red or pink and turgid vulva (54.3 vs. 20%; P<0.01). The sexual receptivity of DLS does depended on the time for which the female was presented to the male: 60% refused mating before opening the nest-box, while 80.9% of them accepted the male after the nursing episode. Plasma levels of estradiol, testosterone and progesterone in DLS group rose from 9th to 11th dpp (+44.4; +59.2 and +82%, respectively; P<0.01) compared to C group (+6.7; -3.9 and +33.4%, respectively; P>0.05). In contrast, cortisol plasma levels were not affected by the DLS treatment (-12.4 and -14.4% for control and DLS group; P>0.05). At day 11 PP, higher plasma E2 and P4 levels were described in DLS in comparison to C, although no significant difference was found, while plasma testosterone concentrations tended to be higher in DLS (165.5±27.1 vs. 114.9±31.9 pg/mL, for DLS and C, respectively; P=0.075). In summary, the 48 h doe-litter-separation acted as an efficient oestrus inductor in primiparous lactating rabbits. Insemination of biostimulated does must occur after the 1st suckling episode following the separation. This biostimulation method did not modify cortisol secretion of the rabbit doe.