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Effect of increased ovulation rate on embryo and foetal survival as a model for selection by ovulation rate in rabbits

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Effect of increased ovulation rate on embryo and foetal survival as a model for selection by ovulation rate in rabbits

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dc.contributor.author Badawy, A.Y. es_ES
dc.contributor.author Peiro, R. es_ES
dc.contributor.author Blasco Mateu, Agustín es_ES
dc.contributor.author Santacreu Jerez, María Antonia es_ES
dc.date.accessioned 2016-09-07T08:28:06Z
dc.date.available 2016-09-07T08:28:06Z
dc.date.issued 2016-06-29
dc.identifier.issn 1257-5011
dc.identifier.uri http://hdl.handle.net/10251/68956
dc.description.abstract [EN] Selection for ovulation rate in prolific species has not improved litter size, due to an increase in prenatal mortality, with most mortality observed in the foetal period. The aim of this study was to investigate the magnitude and timing of embryo and early foetal survival in females with high ovulation rate using hormonal treatment as a model for selection by ovulation rate. Two groups of females (treated and untreated) were used. Treated females were injected with 50 IU equine chorionic gonadotropin 48 h before mating. Females were slaughtered at 18 d of gestation. Ovulation rate (OR), number of implanted embryos (IE), number of live foetuses at 12 and 18 d (LF12 and LF18, respectively) were recorded. In addition, embryo survival (ES=IE/OR), foetal survival at 18 d of gestation (FSLF18=LF18/IE), foetal survival between 12 and 18 d of gestation (FSLF18/LF12=LF18/LF12) and prenatal survival (PSLF18=LF18/OR) were estimated. For each female, the mean and variability of the weight for live foetuses (LFWm and LFWv, respectively) and their placentas (LFPWm and LFPWv, respectively) were calculated. Treated females had a higher ovulation rate (+3.02 ova) than untreated females, with a probability of 0.99. An increase in the differences (D) between treated and untreated females was observed from implantation to 18 d of gestation (D=–0.33, –0.70 and –1.28 for IE, LF12 and LF18, respectively). These differences had a low accuracy and the probability that treated females would have a lower number of foetuses also increased throughout gestation (0.60, 0.70 and 0.86 for IE, LF12 and LF18, respectively). According to the previous results for OR and LF18, treated females showed a lower survival rate from ovulation to 18 d of gestation (D=–0.12, P=0.98 for PSLF18). Treated females also had lower embryo and foetal survival (D=–0.10 and P=0.94 for ES and D=–0.08 and P=0.93 for FSLF18). Main differences in foetal survival appeared from 12 to 18 d of gestation (D=–0.09 and P=0.98 for FSLF18/LF12). Unexpectedly, treated females showed similar foetus weight and higher foetal placenta weight than untreated females (D=0.25 g, P=0.98) and lower variability for these traits (D=–0.02 g, P=0.72 for LFWv and D=–0.05 g, P=0.83 for LFPWv). These results are not related to a lower number of IE or LF18. Thus, the effect of increasing by three ova in rabbits leads to a lower embryo and early foetal survival. There seems to be no relationship between foetal mortality and foetus weight. es_ES
dc.description.sponsorship This study was supported by the Comision Interministerial de Ciencia y Tecnologia CICYT- AGL2011-29831-C03-01 and by funds from Generalitat Valenciana research programme (Prometeo 2009/125). A.Y. Badawy was supported by a grant of the Egyptian Ministry of Higher Education. en_EN
dc.language Inglés es_ES
dc.publisher Editorial Universitat Politècnica de València
dc.relation.ispartof World Rabbit Science
dc.rights Reserva de todos los derechos es_ES
dc.subject Early foetal survival es_ES
dc.subject Embryo survival es_ES
dc.subject High ovulation rate es_ES
dc.subject Rabbit es_ES
dc.title Effect of increased ovulation rate on embryo and foetal survival as a model for selection by ovulation rate in rabbits es_ES
dc.type Artículo es_ES
dc.date.updated 2016-09-07T07:12:39Z
dc.identifier.doi 10.4995/wrs.2016.3992
dc.relation.projectID info:eu-repo/grantAgreement/MICINN//AGL2011-29831-C03-01/ES/SELECCION PARA MEJORAR LA PRODUCTIVIDAD Y LA CALIDAD DE LA CARNE DEL CONEJO/ es_ES
dc.relation.projectID info:eu-repo/grantAgreement/Generalitat Valenciana//GV%2F2009%2F125/ES/Aplicacion del metodo de elementos finitos generalizado a la optimización de forma de componentes mecanicos mediante algoritmos evolutivos/ es_ES
dc.rights.accessRights Abierto es_ES
dc.contributor.affiliation Universitat Politècnica de València. Instituto de Ciencia y Tecnología Animal - Institut de Ciència i Tecnologia Animal
dc.description.bibliographicCitation Badawy, A.; Peiro, R.; Blasco Mateu, A.; Santacreu Jerez, MA. (2016). Effect of increased ovulation rate on embryo and foetal survival as a model for selection by ovulation rate in rabbits. World Rabbit Science. 24(2):87-94. https://doi.org/10.4995/wrs.2016.3992 es_ES
dc.description.accrualMethod SWORD es_ES
dc.relation.publisherversion https://doi.org/10.4995/wrs.2016.3992 es_ES
dc.description.upvformatpinicio 87 es_ES
dc.description.upvformatpfin 94 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 24
dc.description.issue 2
dc.identifier.eissn 1989-8886
dc.contributor.funder Generalitat Valenciana es_ES
dc.contributor.funder Ministerio de Ciencia e Innovación es_ES


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