Evaluation of factors that affect the fertility of the recipient of crossbred Holstein genotype embryos
The study determined the effect of the size of the Corpus Luteum (CL), the concentration of Progesterone (P4), time needed to pass the cervix, the place of deposit of the embryo and the total time required to complete the embryo transfer process (TE) on the pregnancy rate (PR) of Holstein heifers (n...
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| Format: | ARTÍCULO |
| Language: | es_ES |
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2024
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| Online Access: | http://dspace.ucuenca.edu.ec/handle/123456789/44250 https://www.scopus.com/record/display.uri?eid=2-s2.0-85185508732&doi=10.52973%2frcfcv-e34328&origin=inward&txGid=c5d4202531b704d1dce97eb5bcd2caeb |
| _version_ | 1795386280228421632 |
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| author | Ayala Guanga, Luis Eduardo |
| author_facet | Ayala Guanga, Luis Eduardo |
| author_sort | Ayala Guanga, Luis Eduardo |
| collection | DSpace |
| description | The study determined the effect of the size of the Corpus Luteum (CL), the concentration of Progesterone (P4), time needed to pass the cervix, the place of deposit of the embryo and the total time required to complete the embryo transfer process (TE) on the pregnancy rate (PR) of Holstein heifers (n=40). Prior to the transfer, the recipients were ultrasounded and those with CL>15 mm entered the experiment. Fory quality 1 (excellent) frozen-thawed embryos were transferred, obtaining a TR of 45%. The CL size and P4 concentration of pregnant heifers (20.6 ± 0.31 mm; 4.4 ± 0.12 ng·mL−1) were greater than that of non-pregnant heifers (16.7 ± 0.28 mm; 3.1 ± 0.11 ng·mL−1; P<0.05). The time required to pass the cervix was greater in no-pregnant heifers than in pregnant (60.0 ± 5.32 s; 40.3 ± 4.65 s, respectively); as well as the total time spent in ET was greater in non-pregnant heifers (783.0 ± 31.43 s) compared to pregnant heifers (680.9 ± 29.93 s; P<0.05). A high and positive correlation was established between CL size and P4 concentration with pregnancy (r=0.84; r=0.77; P<0.001, respectively). However, the correlation observed between the time used to pass the cervix (r=0.35; P<0.05) and the total time spent transferring the embryo with the pregnancy was positive, but low (r=0.45; P<0.05). It concludes that a CL>20 mm at the time of transfer provided a higher concentration of P4, a factor that increases the probability of establishing a pregnancy. Furthermore, the less time required to pass the cervix, the embryo could be deposited with less manipulation in the cranial third of the uterine horn, decreasing the total time spent transferring the embryo, which increased the conception rate. |
| format | ARTÍCULO |
| id | oai:dspace.ucuenca.edu.ec:123456789-44250 |
| institution | Universidad de Cuenca |
| language | es_ES |
| publishDate | 2024 |
| record_format | dspace |
| spelling | oai:dspace.ucuenca.edu.ec:123456789-442502024-03-12T17:01:59Z Evaluation of factors that affect the fertility of the recipient of crossbred Holstein genotype embryos Evaluación de factores que afectan la fertilidad de la receptora de embriones de genotipo Holstein mestiza Ayala Guanga, Luis Eduardo Gestación Vaquillas Frozen Embryos Embriones Congelados Holstein Heifers Holstein Gestation The study determined the effect of the size of the Corpus Luteum (CL), the concentration of Progesterone (P4), time needed to pass the cervix, the place of deposit of the embryo and the total time required to complete the embryo transfer process (TE) on the pregnancy rate (PR) of Holstein heifers (n=40). Prior to the transfer, the recipients were ultrasounded and those with CL>15 mm entered the experiment. Fory quality 1 (excellent) frozen-thawed embryos were transferred, obtaining a TR of 45%. The CL size and P4 concentration of pregnant heifers (20.6 ± 0.31 mm; 4.4 ± 0.12 ng·mL−1) were greater than that of non-pregnant heifers (16.7 ± 0.28 mm; 3.1 ± 0.11 ng·mL−1; P<0.05). The time required to pass the cervix was greater in no-pregnant heifers than in pregnant (60.0 ± 5.32 s; 40.3 ± 4.65 s, respectively); as well as the total time spent in ET was greater in non-pregnant heifers (783.0 ± 31.43 s) compared to pregnant heifers (680.9 ± 29.93 s; P<0.05). A high and positive correlation was established between CL size and P4 concentration with pregnancy (r=0.84; r=0.77; P<0.001, respectively). However, the correlation observed between the time used to pass the cervix (r=0.35; P<0.05) and the total time spent transferring the embryo with the pregnancy was positive, but low (r=0.45; P<0.05). It concludes that a CL>20 mm at the time of transfer provided a higher concentration of P4, a factor that increases the probability of establishing a pregnancy. Furthermore, the less time required to pass the cervix, the embryo could be deposited with less manipulation in the cranial third of the uterine horn, decreasing the total time spent transferring the embryo, which increased the conception rate. 2024-03-12T17:01:55Z 2024-03-12T17:01:55Z 2024 ARTÍCULO 0798-2259 http://dspace.ucuenca.edu.ec/handle/123456789/44250 https://www.scopus.com/record/display.uri?eid=2-s2.0-85185508732&doi=10.52973%2frcfcv-e34328&origin=inward&txGid=c5d4202531b704d1dce97eb5bcd2caeb 10.52973/rcfcv-e34328 es_ES application/pdf Revista Científica de la Facultad de Ciencias Veterinaria de la Universidad de Zulia (FCV-LUZ) |
| spellingShingle | Gestación Vaquillas Frozen Embryos Embriones Congelados Holstein Heifers Holstein Gestation Ayala Guanga, Luis Eduardo Evaluation of factors that affect the fertility of the recipient of crossbred Holstein genotype embryos |
| title | Evaluation of factors that affect the fertility of the recipient of crossbred Holstein genotype embryos |
| title_full | Evaluation of factors that affect the fertility of the recipient of crossbred Holstein genotype embryos |
| title_fullStr | Evaluation of factors that affect the fertility of the recipient of crossbred Holstein genotype embryos |
| title_full_unstemmed | Evaluation of factors that affect the fertility of the recipient of crossbred Holstein genotype embryos |
| title_short | Evaluation of factors that affect the fertility of the recipient of crossbred Holstein genotype embryos |
| title_sort | evaluation of factors that affect the fertility of the recipient of crossbred holstein genotype embryos |
| topic | Gestación Vaquillas Frozen Embryos Embriones Congelados Holstein Heifers Holstein Gestation |
| url | http://dspace.ucuenca.edu.ec/handle/123456789/44250 https://www.scopus.com/record/display.uri?eid=2-s2.0-85185508732&doi=10.52973%2frcfcv-e34328&origin=inward&txGid=c5d4202531b704d1dce97eb5bcd2caeb |
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