Análisis multifactorial de las tasas de preñez en programas de transferencia de embriones en Colombia

Rodriguez, Maria B; Giraldo, Eliana Maritza Rojas; Castañeda, Perla; Ruiz, C Tatiana; Olivera, A Martha

doi:10.21897/rmvz.418

Cited by 3 publications

(5 citation statements)

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“…Sartori et al [54] working with lactating cows, dry cows and Holstein heifers, gave them PGF 2 α on day 7 of the oestrus cycle, also establishing a correlation between luteal volume and plasma P 4 concentration. Likewise, Rodriguez et al [55] in an analysis conducted in the central and low Colombian tropical areas, using several species and crossbreeds, reported a positive correlation between both variables. This also coincides with a report by Duica [44], who worked with embryo recipients, Holstein heifers to which eCG was applied on day 5 (in relation to the synchronized cycle).…”

Section: Progesterone Concentrationsmentioning

confidence: 79%

“…Rodriguez et al [55] used several species and crossbreeds as recipients with transferred fresh and frozen embryos, then assessed the effect of other independent variables (CL diameter, P 4 concentration, embryo stage, embryo quality and species) upon pregnancy diagnosis. They did not establish any effect of any of these variables upon pregnancy diagnosis.…”

Section: Pregnancy Ratementioning

confidence: 99%

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Antiluteolytic Strategy for Bovine Embryo Transfer Programmes

Luna¹,

Amaya²,

Lombana³

2015

New Discoveries in Embryology

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This paper presents a comprehensive review of the problematic issue of embryonic mortality in cattle and develops possible strategies towards a hormonal antiluteolitic." recent and extensive investigation using eCG is also described.The paper evaluates the effect of the application of IU of equine Chorionic Gonadotrophin eCG on day or of a synchronization protocol for embryo transfer upon follicular development day , luteal development day , progesterone concentration P and and percentage of pregnancy day in Holstein heifers. The relationships between dominant follicle diameter DFD day and the luteal volume VL day , as well as the concentration of P day are analysed without eCG treatments the DFD day , VL day and concentration of P day versus percentage of pregnancy day are then analysed with the treatment.There was no effect P> . of the day of eCG administration or on the number of dominant follicles, but P < . for diameter. The day of eCG administration or had no effect P> . on the number of corpora lutea, VL, P concentration and or pregnancy day . There was no relationship P> . between the DFD day and VL, but P < . between the VL and P levels day . In analysing the relationship between treatments eCG day or , the DFD day , VL day and the concentration of P day versus percentage of pregnancy day , we observed that the only positive correlation P < . existed between this variable and the concentration of P . It has been suggested that during pregnancy establishment there is a well defined critical period from day to day [ ] we can suppose that reproductive biology during this period would be multifactorial and complex, where the endometrium receives a non-suitable antiluteolytic signal, of course without blocking prostaglandin F PGF endometrial production, triggering the lysis of the corpus luteum CL maintaining pregnancy depends upon CL functionality [ ]. "t that point, antiluteolytic signal is generated by the embryo into mononuclear trophoblast cells, which secrete interferon tau IFN-τ , thereby blocking PGF synthesis produced at endometrial level [ ]. The latter process suggests that embryo loss could occur because of a weak or inadequate signal due to an asynchrony between a decreasing progesterone P and the degree of embryo development, so it does not inhibit the synthesis of uterine PGF [ ].The critical nature of the period of recognition, apposition and adhesion of the embryo to uterine endometrium during implantation demands strict synchronization between the transferred embryo and the recipient, emphasizing the importance of both the uterine environment and the embryo signals generating MRP [ ] [ ]. These signals must be released at the time and concentration required to guarantee CL structure and function maintenance, generating continuous P production for embryotrophic environment maintenance to support the normal development of the conceptus the embryo including all the linked layers [ ].In relation to the influence of P on certain events related to pregnancy maintenance from early stages ...

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Section: Progesterone Concentrationsmentioning

confidence: 79%

Section: Pregnancy Ratementioning

confidence: 99%

Antiluteolytic Strategy for Bovine Embryo Transfer Programmes

Luna¹,

Amaya²,

Lombana³

2015

New Discoveries in Embryology

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“…In the protocol, the following days were worked on: day (0) placing progesterone (P4) estradiol benzoate (BE), prostaglandin (PG) and equine gonadotropin (eCG) as follows: P4 0.8 mL BE 2.5 mL PG foaming ovule , day (5) eCG 2Ml, day (8) withdrawal of P4 2.5 PG, day (9) 0.4 mL BE, day (10) visual observation of heat, day (16) evaluation by rectal palpation of ovaries and uterus of recipients ( presence of functional corpus luteum in ovaries and flaccid uterus) and day (17) embryo transfer.…”

Section: Implementation Of the Heat Synchronization Protocolmentioning

confidence: 99%

“…In Colombia, results have been reported using female recipients of embryos of different racial types and crosses, so Rodríguez et al 17 in a study conducted in the middle and lower Colombian tropics report pregnancy rates with fresh embryos of 31% and, frozen at 46%. The results according to this author and related to our results, are only higher in the pregnancy rate 54.1% in fresh state and frozen state is lower with 34.6%, which could be due to the conditions of in vitro embryos transferred in some proportion or in the referential study, among others, and to a lesser degree to the worked racial typologies, since according to what was previously mentioned, different pregnancy rates have been obtained using racial typologies.…”

Section: % Of Pregnancy Percentage Of Pregnancymentioning

confidence: 99%

Factors affecting the pregnancy rate in transfers of embryos in crossbreed Brown Swiss

Julón

Burga

Bardales

et al. 2018

MOJAP

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In vivo embryo transfer was carried out in crossbred Brown Swiss cows from the influential provinces of National Toribio Rodriguez de Mendoza University (UNTRM) experimental stations, from the beginning of the autumn season of 2013 to the end of spring season of 2015, for which states of transfers. Transfers were used mainly in receptors crossbred Brown Swiss cows, with a population of 126 receptors cows aged 2 to 9 years with a number of births ranging from 0 to 7, of which 74 transfers were performed with embryos fresh and 52 with frozen embryos. After 28 to 35 days of transfer of the embryo, gestation was evaluated by ultrasonography. With the objective of obtaining a pregnancy rate by state and the totality of the transfers, they were evaluated with the ANDEVA technique with a statistical significance of 5%. Obtaining that the pregnancy rate presented a significant statistical variation due to factors like the station and the state (fresh or frozen). Likewise, the value of total embryo transfer was 46.0%, while embryo transfer in the fresh and frozen state was 54.1% and 34.6%, respectively, and it was considered successful.

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“…Esta perspectiva se fundamenta en la idea de la consecución de la ventaja competitiva sostenible a través de la posesión por parte de la empresa de un conjunto de recursos únicos, valiosos, inimitables e insustituibles, combinados e integrados para dar lugar a capacidades organizativas distintivas (Rodríguez, Ruiz & Armario, 2012). Es así como en el ámbito de la economía y de la dirección de empresas se destaca actualmente el papel estratégico que juega el conocimiento en la creación de valor y ventaja competitiva de las organizaciones (Acosta, Longo-Somoza & Fischer, 2013).…”

Section: Capacidades Dinámicasunclassified

Gestión del talento humano por competencias para el desarrollo de capacidades dinámicas, un acercamiento para el diseño de sistemas de gestión

Solano

Salamanca²,

Rodríguez³

et al. 2016

agnosis

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La gestión del talento humano es una función de vital importancia para las empresas, siendo un factor determi-nante en el logro de los objetivos corporativos. El presente artículo pretende revisar la teoría relacionada con la gestión del talento humano, los modelos de competencias y las capacidades dinámicas, con el propósito de establecer un marco que permita diseñar un modelo de gestión del talento humano por competencias para el desarrollo de estas últimas. Para ello presenta el abordaje teórico relacionado con la gestión del talento huma-no y las funciones de esta área en una organización, posteriormente analiza los modelos de gestión del talento humano por competencias, acercándose principalmente al propuesto por Martha Alles, por lo que se ahonda en este modelo; finalmente, se abordan las teorías relacionadas con capacidades dinámicas como fin de mejora-miento organizacional desde la gestión del talento humano. Se concluye que el diseño de este modelo le permite a la organización que lo implemente mayor competitividad, potenciado desde la gestión del talento humano. Se recomienda, a su vez, el compromiso decidido de todos, empezando por la alta dirección, así como crear un diccionario de competencias coherente con los propósitos estratégicos de la organización.

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Análisis multifactorial de las tasas de preñez en programas de transferencia de embriones en Colombia

Cited by 3 publications

References 0 publications

Antiluteolytic Strategy for Bovine Embryo Transfer Programmes

Antiluteolytic Strategy for Bovine Embryo Transfer Programmes

Factors affecting the pregnancy rate in transfers of embryos in crossbreed Brown Swiss

Gestión del talento humano por competencias para el desarrollo de capacidades dinámicas, un acercamiento para el diseño de sistemas de gestión

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