Superstimulation with eCG prior to ovum pick-up improves follicular development and fertilization rate of cattle oocytes
This study aimed to evaluate the effect of equine chorionic gonadotrophin (eCG) stimulation prior to ovum pick-up (OPU) on follicular development, number and quality of recovered oocytes, fertilization rate, and early embryo development in vitro. There were four OPU sessions (cross over) conducted o...
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| Published in: | Animal reproduction science Vol. 195; pp. 284 - 290 |
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| Format: | Journal Article |
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01-08-2018
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| Abstract | This study aimed to evaluate the effect of equine chorionic gonadotrophin (eCG) stimulation prior to ovum pick-up (OPU) on follicular development, number and quality of recovered oocytes, fertilization rate, and early embryo development in vitro. There were four OPU sessions (cross over) conducted on 16 Braford cows to evaluate the effect of various eCG doses. The timing of the wave of ovarian follicular development was synchronized, and three days after, the respective eCG dose was administrated (0, 200, 400, or 800 IU). The OPU was performed on Day 6, and viable oocytes were used for IVM and IVF according to the respective treatment. After IVF treatment, the fertilization and cleavage rates, time of cleavage, and the cell number at 48 h were evaluated. There was no difference in the number of follicles, oocyte quantity, and morphological quality of oocytes among treatments (P > 0.05). The oocyte recovery rate was similar among the eCG-treated groups, but was less than in the control group (P < 0.01). The eCG800 group, however, had a greater recovery rate of follicles >6 mm in diameter (P < 0.01). In addition, the eCG800 group had a greater rate of normal fertilization (P < 0.01) and lesser rate of polyspermy (P < 0.02). The cleavage rate of the eCG800 group was greater than the other treatment groups but similar to that of the control. In conclusion, the use of eCG800 increased the proportion of follicles > 6 mm, with improved rate of normal fertilization and reduced occurrence of polyspermy, without affecting early embryonic development in vitro. |
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| AbstractList | This study aimed to evaluate the effect of equine chorionic gonadotrophin (eCG) stimulation prior to ovum pick-up (OPU) on follicular development, number and quality of recovered oocytes, fertilization rate, and early embryo development in vitro. There were four OPU sessions (cross over) conducted on 16 Braford cows to evaluate the effect of various eCG doses. The timing of the wave of ovarian follicular development was synchronized, and three days after, the respective eCG dose was administrated (0, 200, 400, or 800 IU). The OPU was performed on Day 6, and viable oocytes were used for IVM and IVF according to the respective treatment. After IVF treatment, the fertilization and cleavage rates, time of cleavage, and the cell number at 48 h were evaluated. There was no difference in the number of follicles, oocyte quantity, and morphological quality of oocytes among treatments (P > 0.05). The oocyte recovery rate was similar among the eCG-treated groups, but was less than in the control group (P < 0.01). The eCG800 group, however, had a greater recovery rate of follicles >6 mm in diameter (P < 0.01). In addition, the eCG800 group had a greater rate of normal fertilization (P < 0.01) and lesser rate of polyspermy (P < 0.02). The cleavage rate of the eCG800 group was greater than the other treatment groups but similar to that of the control. In conclusion, the use of eCG800 increased the proportion of follicles > 6 mm, with improved rate of normal fertilization and reduced occurrence of polyspermy, without affecting early embryonic development in vitro. This study aimed to evaluate the effect of equine chorionic gonadotrophin (eCG) stimulation prior to ovum pick-up (OPU) on follicular development, number and quality of recovered oocytes, fertilization rate, and early embryo development in vitro. There were four OPU sessions (cross over) conducted on 16 Braford cows to evaluate the effect of various eCG doses. The timing of the wave of ovarian follicular development was synchronized, and three days after, the respective eCG dose was administrated (0, 200, 400, or 800 IU). The OPU was performed on Day 6, and viable oocytes were used for IVM and IVF according to the respective treatment. After IVF treatment, the fertilization and cleavage rates, time of cleavage, and the cell number at 48 h were evaluated. There was no difference in the number of follicles, oocyte quantity, and morphological quality of oocytes among treatments (P > 0.05). The oocyte recovery rate was similar among the eCG-treated groups, but was less than in the control group (P < 0.01). The eCG800 group, however, had a greater recovery rate of follicles >6 mm in diameter (P < 0.01). In addition, the eCG800 group had a greater rate of normal fertilization (P < 0.01) and lesser rate of polyspermy (P < 0.02). The cleavage rate of the eCG800 group was greater than the other treatment groups but similar to that of the control. In conclusion, the use of eCG800 increased the proportion of follicles > 6 mm, with improved rate of normal fertilization and reduced occurrence of polyspermy, without affecting early embryonic development in vitro. |
| Author | Claro, Izaias Missio, Daniele Neto, Normélio Alves Leivas, Fabio Gallas Ribas, Bibiana Noal dos Santos Brum, Daniela Junior Roman, Isac |
| Author_xml | – sequence: 1 givenname: Bibiana Noal surname: Ribas fullname: Ribas, Bibiana Noal organization: Universidade Federal do Pampa (UNIPAMPA), Lab Biotecnologia da Reprodução (BIOTECH), 97.500-970, Uruguaiana, RS, Brazil – sequence: 2 givenname: Daniele surname: Missio fullname: Missio, Daniele organization: Universidade Federal do Pampa (UNIPAMPA), Lab Biotecnologia da Reprodução (BIOTECH), 97.500-970, Uruguaiana, RS, Brazil – sequence: 3 givenname: Isac surname: Junior Roman fullname: Junior Roman, Isac organization: Universidade Federal do Pampa (UNIPAMPA), Lab Biotecnologia da Reprodução (BIOTECH), 97.500-970, Uruguaiana, RS, Brazil – sequence: 4 givenname: Normélio Alves surname: Neto fullname: Neto, Normélio Alves organization: Zoetis Indústria de Produtos Veterinários Ltda, São Paulo, São Paulo, Brazil – sequence: 5 givenname: Izaias surname: Claro fullname: Claro, Izaias organization: Zoetis Indústria de Produtos Veterinários Ltda, São Paulo, São Paulo, Brazil – sequence: 6 givenname: Daniela surname: dos Santos Brum fullname: dos Santos Brum, Daniela organization: Universidade Federal do Pampa (UNIPAMPA), Lab Biotecnologia da Reprodução (BIOTECH), 97.500-970, Uruguaiana, RS, Brazil – sequence: 7 givenname: Fabio Gallas surname: Leivas fullname: Leivas, Fabio Gallas email: fabioleivas@unipampa.edu.br organization: Universidade Federal do Pampa (UNIPAMPA), Lab Biotecnologia da Reprodução (BIOTECH), 97.500-970, Uruguaiana, RS, Brazil |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/29907333$$D View this record in MEDLINE/PubMed |
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| CitedBy_id | crossref_primary_10_1016_j_theriogenology_2021_07_003 crossref_primary_10_1186_s13059_022_02763_2 crossref_primary_10_1080_1828051X_2019_1684213 crossref_primary_10_30704_http_www_jivs_net_1403722 crossref_primary_10_1262_jrd_2018_155 crossref_primary_10_1002_mrd_23251 |
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| Keywords | Follicular growth Bovine OPU Oocyte Embryo IVP |
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