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Pituitary and ovarian hormones: is their plasma concentration affected by litter size in primiparous lactating rabbit does?

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Pituitary and ovarian hormones: is their plasma concentration affected by litter size in primiparous lactating rabbit does?

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dc.contributor.author Fernández-Pacheco, Carlota es_ES
dc.contributor.author Millán, Pilar es_ES
dc.contributor.author Rodríguez, María es_ES
dc.contributor.author Formoso-Rafferty, Nora es_ES
dc.contributor.author Velasco, Beatriz es_ES
dc.contributor.author Rebollar, Pilar G. es_ES
dc.date.accessioned 2021-10-01T08:16:50Z
dc.date.available 2021-10-01T08:16:50Z
dc.date.issued 2021-09-30
dc.identifier.issn 1257-5011
dc.identifier.uri http://hdl.handle.net/10251/173607
dc.description.abstract [EN] Genetic selection in commercial rabbit lines based on litter size has positively improved the number of kits suckling, presumably to weaning. Although it has been proven that the energetic balance of primiparous does is due to the need to satisfy pregnancy, lactation and growth requirements, litter size adjustment from 7 to 12 kits is applied as a routine in commercial rabbit farms. The suckling stimulus provokes a prolactin (PRL) secretion, which in turn can modulate the preovulatory release of luteinising hormone (LH) and, consequently, the ovulatory and productive responses of the does. This study aimed to determine if litter size of prolific primiparous rabbit does during lactation [Group HL, with high litter density (10-12 kits; n=21) and Group LL, with low litter density (7-9 kits; n=29)] influences plasma concentration of PRL. Blood samples from lactating does were taken weekly throughout lactation starting on day 4 post-partum, until day 32 post-partum, before and immediately after suckling. In addition, the does were re-inseminated after weaning (day 32 post-partum), and sampled at 0 and 60 min after induction of ovulation to determine whether litter size affected the peak of LH, progesterone (P4) concentrations and the main productive parameters of their second pregnancy. All hormones were determined by enzyme immunoassay. Statistical analysis of the results revealed that the PRL concentrations of hyperprolific rabbit does before and immediately after a suckling stimulus from 7-9 or 10-12 kits were significanltly different, as we only detected basal levels, with a rise after weaning in both groups. More studies are necessary, delaying blood sampling to later periods of time after the suckling stimulus, in order to conclude whether the peak release of this hormone is altered or not. There were also no differences in plasma LH and progesterone levels after artificial insemination, or in productive performance of these females after their second pregnancy. In conclusion, the litter size adjustment of prolific primiparous rabbits with 7 to 12 kits determines adequate pituitary, ovarian and reproductive responses at second parturition if the does are inseminated after weaning. es_ES
dc.description.sponsorship This work was supported by the Spanish Ministry of Economy and Competitiveness [Project AGL2015-65572-C2-R1 and Project RTI2018-094404-B-C21]. es_ES
dc.language Inglés es_ES
dc.publisher Universitat Politècnica de València es_ES
dc.relation.ispartof World Rabbit Science es_ES
dc.rights Reconocimiento - No comercial - Compartir igual (by-nc-sa) es_ES
dc.subject Rabbit es_ES
dc.subject Doe es_ES
dc.subject Litter size es_ES
dc.subject Prolactin es_ES
dc.subject Progesterone es_ES
dc.subject LH es_ES
dc.subject Productive performance es_ES
dc.title Pituitary and ovarian hormones: is their plasma concentration affected by litter size in primiparous lactating rabbit does? es_ES
dc.type Artículo es_ES
dc.relation.projectID info:eu-repo/grantAgreement/MINECO//AGL2015-65572-C2-R1/ es_ES
dc.relation.projectID info:eu-repo/grantAgreement/MINECO//RTI2018-094404-B-C21/ es_ES
dc.rights.accessRights Abierto es_ES
dc.description.bibliographicCitation Fernández-Pacheco, C.; Millán, P.; Rodríguez, M.; Formoso-Rafferty, N.; Velasco, B.; Rebollar, PG. (2021). Pituitary and ovarian hormones: is their plasma concentration affected by litter size in primiparous lactating rabbit does?. World Rabbit Science. 29(3):161-168. http://hdl.handle.net/10251/173607 es_ES
dc.description.accrualMethod OJS es_ES
dc.description.upvformatpinicio 161 es_ES
dc.description.upvformatpfin 168 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 29 es_ES
dc.description.issue 3 es_ES
dc.identifier.eissn 1989-8886
dc.relation.pasarela OJS\15122 es_ES
dc.contributor.funder Ministerio de Economía y Competitividad es_ES


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