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Chen X, Yu F, Zhu Z, Huang J, Zhang L, Pan J. The effect of fixed-time artificial insemination protocol initiated at different stages of the estrous cycle on follicle development and ovulation in gilts. J Reprod Dev 2021; 67:380-385. [PMID: 34657902 PMCID: PMC8668377 DOI: 10.1262/jrd.2021-060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Accepted: 09/15/2021] [Indexed: 12/02/2022] Open
Abstract
Hormonal products have been developed for fixed-time artificial insemination (FTAI) to improve the efficiency of swine production. Here, we evaluated the effect of an FTAI protocol initiated during different phases of the estrous cycle on follicle development and ovulation in gilts. A total of 36 gilts were equally divided into three groups designated as the luteal (L), follicular (F), and post-ovulation (O) groups and fed with 20 mg of altrenogest for 18 days, followed by intramuscular injection of 1000 IU PMSG at 42 h after withdrawal of altrenogest, and 100 μg of GnRH after an 80-h interval. The L group had the highest number of follicles 4-6 mm in diameter, as well as corpora hemorrhagica. The mRNA expression of caspase-9 in the L group were significantly lower than those in the O and F groups (P < 0.05), while CYP11A1 and VEGF mRNA expression levels were significantly higher (P < 0.05). Moreover, FSHR mRNA levels were significantly higher in the O group than in the L, F, and control groups (P < 0.05). LHCGR and CYP19A1 mRNA levels were the highest in the F group (P < 0.05). Thus, the changes in the expression of genes associated with follicular development, maturation, and ovulation identified in this study indicated that initiation of the FTAI protocol during the luteal phase induced a better environment for follicle development and ovulation in gilts.
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Affiliation(s)
- Xiaoyu Chen
- Animal Biotechnology Laboratory, Zhejiang Academy of Agricultural Science, Hangzhou 310021, China
| | - Fuxian Yu
- Animal Biotechnology Laboratory, Zhejiang Academy of Agricultural Science, Hangzhou 310021, China
| | - Zhiwei Zhu
- Animal Biotechnology Laboratory, Zhejiang Academy of Agricultural Science, Hangzhou 310021, China
- Ningbo Kuangdai Livestock Husbandry Technology Co., Ltd., Ningbo 315181, China
| | - Jing Huang
- Animal Biotechnology Laboratory, Zhejiang Academy of Agricultural Science, Hangzhou 310021, China
- Ningbo Kuangdai Livestock Husbandry Technology Co., Ltd., Ningbo 315181, China
| | - Liang Zhang
- Animal Biotechnology Laboratory, Zhejiang Academy of Agricultural Science, Hangzhou 310021, China
| | - Jianzhi Pan
- Animal Biotechnology Laboratory, Zhejiang Academy of Agricultural Science, Hangzhou 310021, China
- Ningbo Kuangdai Livestock Husbandry Technology Co., Ltd., Ningbo 315181, China
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Silva PCP, Brasil OO, Souto PLG, Moreira NH, da Silva JP, Silva BDM, Ramos AF. Fixed-time artificial insemination protocols on brazilian locally adapted breed gilts on ovulatory response and embryo production. Anim Reprod 2021; 18:e20200776. [PMID: 34122655 PMCID: PMC8189352 DOI: 10.1590/1984-3143-ar2020-0776] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The aim of this study was to use estrus synchronization protocols to favor fixed-time artificial insemination and consequently fixed-time embryo collection, and increase embryo production using eCG, in gits. In a cross over design, nine Piau breed gilts were subjected to 18 days of oral progesterone; P4 group did not receive any further; GnRH group received 25µg of GnRH 104 hours after the final application of P4; and eCG+GnRH group received 1000IU of eCG 24 hours after the final P4 in addition to GnRH for subsequent embryo collection, that was performed six days after first AI, by laparotomy. Artificial insemination was performed after 12 and 24 hours of estrus in P4 group, and 128 and 144 hours in GnRH and eCG+GnRH groups. The number of CL (8.6±3.9; 8.3±2.1; 26.7±15.0) and anovulatory follicles (4.3±3.7; 3.9±3.9; 17.2±9.5) was higher in the eCG+GnRH gilts (P<0.05). However, the use of 1000 IU of eCG reduced (P<0.05) the number of total structures (5.2±3.6; 5.1±3.1; 1.7±2.7), viable embryos (5.0±3.5; 4.8±3.3; 0.4±0.7), freezable embryos (3.6±3.4; 3.3±3.8; 0.1±0.3) and recovery rate (63.7±38.9; 58.6±24.7; 5.38±9.5). P4 and GnRH protocols were effective in the production and recovery of embryos. However, the use of 1000 IU of eCG, 24 hours after P4, was not effective in promoting the production of embryos, although the animals had superovulated.
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Affiliation(s)
| | - Oscar Oliveira Brasil
- Departamento de Ciências Animais, Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Brasília, DF, Brasil
| | - Paula Lorena Grangeira Souto
- Departamento de Ciências Animais, Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Brasília, DF, Brasil
| | - Nathalia Hack Moreira
- Departamento de Ciências Animais, Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Brasília, DF, Brasil
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Antczak DF, Allen WRT. Placentation in Equids. ADVANCES IN ANATOMY, EMBRYOLOGY, AND CELL BIOLOGY 2021; 234:91-128. [PMID: 34694479 DOI: 10.1007/978-3-030-77360-1_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
This chapter focuses on the early stages of placental development in horses and their relatives in the genus Equus and highlights unique features of equid reproductive biology. The equine placenta is classified as a noninvasive, epitheliochorial type. However, equids have evolved a minor component of invasive trophoblast, the chorionic girdle and endometrial cups, which links the equine placenta with the highly invasive hemochorial placentae of rodents and, particularly, with the primate placenta. Two types of fetus-to-mother signaling in equine pregnancy are mediated by the invasive equine trophoblast cells. First, endocrinological signaling mediated by equine chorionic gonadotrophin (eCG) drives maternal progesterone production to support the equine conceptus between days 40 and 100 of gestation. Only in primates and equids does the placenta produce a gonadotrophin, but the evolutionary paths taken by these two groups of mammals to produce this placental signal were very different. Second, florid expression of paternal major histocompatibility complex (MHC) class I molecules by invading chorionic girdle cells stimulates strong maternal anti-fetal antibody responses that may play a role in the development of immunological tolerance that protects the conceptus from destruction by the maternal immune system. In humans, invasive extravillous trophoblasts also express MHC class I molecules, but the loci involved, and their likely function, are different from those of the horse. Comparison of the cellular and molecular events in these disparate species provides outstanding examples of convergent evolution and co-option in mammalian pregnancy and highlights how studies of the equine placenta have produced new insights into reproductive strategies.
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Affiliation(s)
- Douglas F Antczak
- Department of Microbiology and Immunology, College of Veterinary Medicine, Baker Institute for Animal Health, Cornell University, Ithaca, NY, USA.
| | - W R Twink Allen
- Sharjah Equine Hospital, Sharjah, United Arab Emirates
- Robinson College, University of Cambridge, Cambridge, UK
- The Paul Mellon Laboratory of Equine Reproduction, 'Brunswick', Newmarket, Suffolk, UK
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Małysz-Cymborska I, Andronowska A. Ovarian stimulation with human chorionic gonadotropin and equine chorionic gonadotropin affects prostacyclin and its receptor expression in the porcine oviduct. Domest Anim Endocrinol 2015; 53:17-25. [PMID: 26069941 DOI: 10.1016/j.domaniend.2015.04.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Revised: 03/14/2015] [Accepted: 04/03/2015] [Indexed: 12/01/2022]
Abstract
Prostaglandins are well-known mediators of crucial events in the female reproductive tract, eg, early embryo development and implantation. Prostacyclin (PGI2) is the most synthesized prostaglandin in the human oviduct during the postovulatory period, indicating its important role in supporting and regulating the oviductal environment. The present study was undertaken to determine the influence of insemination and ovarian stimulation with human chorionic gonadotropin (hCG)/equine chorionic gonadotropin (eCG) on PGI2 synthesis in the porcine oviduct on day 3 post coitus. Mature gilts (n = 25) were assigned into 2 experiments. In experiment I, gilts were divided into cyclic (control; n = 5) and inseminated (control; n = 5) groups. In experiment II, there were 3 groups of animals: inseminated (n = 5), induced ovulation/inseminated (750 IU eCG, 500 IU hCG; n = 5), and superovulated/inseminated (1,500 IU eCG, 1,000 IU hCG; n = 5) gilts. Parts of oviducts (isthmus and ampulla) were collected 3 days after phosphate-buffered saline treatment (cyclic gilts of experiment I) or insemination (all other groups). Expression of messenger RNA for PGI2 synthase (PGIS) and its receptor (IP) was measured by real-time reverse transcription polymerase chain reaction (real-time RT PCR) and protein levels using Western blots. Concentrations of the PGI2 metabolite 6-keto PGF1α were evaluated by enzyme immunoassay and localization of PGIS and IP in the oviductal tissues using immunohistochemical staining. Insemination by itself increased PGIS protein levels in the oviductal isthmus (P < 0.05) and IP protein expression in the ampulla (P < 0.05). The concentration of 6-keto PGF1α increased significantly in the oviductal ampulla after insemination (P < 0.05). Induction of ovulation decreased IP protein levels in the oviductal ampulla (P < 0.05), whereas superovulation reduced IP levels in both parts of the oviduct (P < 0.01). Synthesis of 6-keto PGF1α was reduced by induction of ovulation and by superovulation in the oviductal ampulla (P < 0.05). Immunohistochemical staining confirmed the presence of PGIS in the muscular layer of the isthmus and both mucosa and muscular layers of the ampulla. IP-positive cells were observed in both mucosal and muscular layers of the isthmus and ampulla. This study showed for the first time that PGI2 synthesis and IP expression are insemination dependent. Moreover, ovarian stimulation with hCG/eCG decreases IP expression and 6-keto PGF1α concentrations in porcine oviducts. Therefore, disturbances in PGI2/IP expression and synthesis may lead to disruption of the oviductal environment and, in turn, perturbed development of embryos and their transport to the uterus.
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Affiliation(s)
- I Małysz-Cymborska
- Department of Hormonal Action Mechanisms, Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Olsztyn, Poland
| | - A Andronowska
- Department of Hormonal Action Mechanisms, Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Olsztyn, Poland.
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Juárez-Mosqueda ML, Anzaldúa Arce SR, Palma Lara I, García Dalmán C, Cornejo Cortés MA, Córdova Izquierdo A, Villaseñor Gaona H, Trujillo Ortega ME. Oestrus Synchronization Treatment Induces Histomorphological Changes on the Uterine Tube Epithelium of the Gilt. Anat Histol Embryol 2014; 44:441-51. [DOI: 10.1111/ahe.12156] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Accepted: 09/19/2014] [Indexed: 11/28/2022]
Affiliation(s)
- M. L. Juárez-Mosqueda
- Departamento de Morfología; Facultad de Medicina Veterinaria y Zootecnia; Universidad Nacional Autónoma de México; Avenida Universidad #3000 Delegación Coyoacán D.F. CP 04510 México D.F. México
| | - S. R. Anzaldúa Arce
- Departamento de Morfología; Facultad de Medicina Veterinaria y Zootecnia; Universidad Nacional Autónoma de México; Avenida Universidad #3000 Delegación Coyoacán D.F. CP 04510 México D.F. México
| | - I. Palma Lara
- Departamento de Morfología; Facultad de Medicina Veterinaria y Zootecnia; Universidad Nacional Autónoma de México; Avenida Universidad #3000 Delegación Coyoacán D.F. CP 04510 México D.F. México
- Molecular and Celular Morphology Laboratory; Escuela Superior de Medicina; Instituto Politécnico Nacional; Plan de San Luis y Díaz Mirón CP 11340 México D.F. México
| | - C. García Dalmán
- Departamento de Morfología; Facultad de Medicina Veterinaria y Zootecnia; Universidad Nacional Autónoma de México; Avenida Universidad #3000 Delegación Coyoacán D.F. CP 04510 México D.F. México
| | - M. A. Cornejo Cortés
- Facultad de Estudios Superiores Cuautitlán; Universidad Nacional Autónoma de México; Carretera Cuautitlán-Teoloyucan Km 2.5 San Sebastián Xhala Cuautitlán Izcalli C.P. 54714 Cuautitlán Izcalli Edo. de México México
| | - A. Córdova Izquierdo
- Departamento de producción agrícola Animal; Universidad Autónoma Metropolitana; Unidad Xochimilco. Calzada del Hueso #1100 Colonia Villa quietud CP 04960 México D.F. México
| | - H. Villaseñor Gaona
- Departamento de Morfología; Facultad de Medicina Veterinaria y Zootecnia; Universidad Nacional Autónoma de México; Avenida Universidad #3000 Delegación Coyoacán D.F. CP 04510 México D.F. México
| | - M. E. Trujillo Ortega
- Departamento de Medicina y Zootecnia de Cerdos; Facultad de Medicina Veterinaria y Zootecnia; Universidad Nacional Autónoma de México; Avenida Universidad #3000 Delegación Coyoacán D.F. CP 04510 México D.F. México
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Szymanska M, Morawska-Pucinska E, Krawczynski K, Kiewisz J, Ziecik AJ, Blitek A. Effect of Oestrus Synchronization with PGF2α/eCG/hCG on Luteal P4 Synthesis in Early Pregnant Gilts. Reprod Domest Anim 2014; 49:1034-42. [DOI: 10.1111/rda.12433] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Accepted: 08/31/2014] [Indexed: 11/29/2022]
Affiliation(s)
- M Szymanska
- Institute of Animal Reproduction and Food Research of the Polish Academy of Sciences; Olsztyn Poland
| | - E Morawska-Pucinska
- Institute of Animal Reproduction and Food Research of the Polish Academy of Sciences; Olsztyn Poland
| | - K Krawczynski
- Institute of Animal Reproduction and Food Research of the Polish Academy of Sciences; Olsztyn Poland
| | - J Kiewisz
- Institute of Animal Reproduction and Food Research of the Polish Academy of Sciences; Olsztyn Poland
| | - AJ Ziecik
- Institute of Animal Reproduction and Food Research of the Polish Academy of Sciences; Olsztyn Poland
| | - A Blitek
- Institute of Animal Reproduction and Food Research of the Polish Academy of Sciences; Olsztyn Poland
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Bogacki M, Wasielak M, Kitewska A, Bogacka I, Jalali BM. The effect of hormonal estrus induction on maternal effect and apoptosis-related genes expression in porcine cumulus-oocyte complexes. Reprod Biol Endocrinol 2014; 12:32. [PMID: 24885667 PMCID: PMC4012087 DOI: 10.1186/1477-7827-12-32] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Accepted: 03/27/2014] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND The effect of hormonal estrus induction on maternal effect (MATER - maternal antigen that embryo requires, ZAR-1 - zygote arrest 1, and BMP15 - bone morphogenetic protein 15) and apoptosis-related genes expression (BCL-2 and BAX) in porcine cumulus-oocyte complexes (COCs) and selected follicular parameters was investigated in this study. METHODS Gilts were divided into three groups: (I) with natural estrus; (II) stimulated with PMSG/hCG; and (III) with PMSG/hCG + PGF2alpha. Analysis of maternal effect and apoptosis-related transcripts expression in COCs, and progesterone synthesis pathway genes expression (P450scc and 3betaHSD) in granulosa cells was performed by qPCR. BMP15 protein expression in follicular fluid (FF) was analyzed by western blot. Oocyte nuclear maturation was assessed by aceto-orcein staining. Progesterone (P4) and estradiol (E2) concentrations in FF and serum were measured by ELISA. Data were analyzed with the one-way ANOVA and Bonferroni post-test or Kruskal-Wallis test and Dunns post-test. RESULTS The highest expression of MATER, ZAR-1, and BMP15 genes was found in COCs recovered from gilts treated with PMSG/hCG when compared to PMSG/hCG + PGF2alpha-stimulated or non-stimulated gilts. Hormonal treatment did not affect the BMP15 protein expression in FF, but increased the expression of genes participating in P4 synthesis in granulosa cells. The higher percentage of immature oocytes was found in PMSG/hCG-treated when compared to the non-stimulated gilts. The expression of BCL-2 and BAX mRNA, and BCL-2/BAX mRNA ratio was significantly higher in COCs derived from PMSG/hCG-treated when compared to PMSG/hCG + PGF2alpha-treated or non-stimulated subjects. The level of P4 in serum was similar in animals from all experimental groups, while its concentration in FF was greater in gilts subjected to PMSG/hCG treatment than in PMSG/hCG + PGF2alpha-stimulated and non-stimulated gilts. The concentration of E2 did not differ in the serum or FF between the control group and the hormonally stimulated groups. CONCLUSIONS Hormonal induction of estrus affected maternal effect gene transcripts levels in COCs and and oocyte nuclear maturation. The inclusion of PGF2alpha into the stimulation protocol enabled maintaining of physiological concentration of P4 in FF. Additionally, both hormonal treatments seem to be beneficial for apoptosis prevention through increasing BCL-2/BAX transcript ratio.
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Affiliation(s)
- Marek Bogacki
- Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Tuwima 10, Olsztyn 10-748, Poland
| | - Marta Wasielak
- Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Tuwima 10, Olsztyn 10-748, Poland
| | - Anna Kitewska
- Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Tuwima 10, Olsztyn 10-748, Poland
| | - Iwona Bogacka
- Department of Animal Physiology, University of Warmia and Mazury, Oczapowskiego 2, Olsztyn 10-719, Poland
| | - Beenu Moza Jalali
- Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Tuwima 10, Olsztyn 10-748, Poland
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Sarsaifi K, Omar MA, Yusoff RH, Haron AW, Hani H, Yimer N, Vejayan J, Naing SW, Othman AM. Development of Superovulation Program and Heterologous in vitro Fertilization Test Assessment in Hamsters. ACTA ACUST UNITED AC 2013. [DOI: 10.3923/ajava.2013.796.805] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Małysz-Cymborska I, Ziecik AJ, Waclawik A, Andronowska A. Effect of hCG and eCG Treatments on Prostaglandins Synthesis in the Porcine Oviduct. Reprod Domest Anim 2013; 48:1034-42. [DOI: 10.1111/rda.12210] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Accepted: 06/03/2013] [Indexed: 11/29/2022]
Affiliation(s)
- I Małysz-Cymborska
- Department of Hormonal Action Mechanisms; Institute of Animal Reproduction and Food Research of the Polish Academy of Sciences; Olsztyn Poland
| | - AJ Ziecik
- Department of Hormonal Action Mechanisms; Institute of Animal Reproduction and Food Research of the Polish Academy of Sciences; Olsztyn Poland
| | - A Waclawik
- Department of Hormonal Action Mechanisms; Institute of Animal Reproduction and Food Research of the Polish Academy of Sciences; Olsztyn Poland
| | - A Andronowska
- Department of Hormonal Action Mechanisms; Institute of Animal Reproduction and Food Research of the Polish Academy of Sciences; Olsztyn Poland
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Kiewisz J, Kaczmarek MM, Morawska E, Blitek A, Kapelanski W, Ziecik AJ. Estrus synchronization affects WNT signaling in the porcine reproductive tract and embryos. Theriogenology 2011; 76:1684-94. [PMID: 21890190 DOI: 10.1016/j.theriogenology.2011.06.034] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Revised: 06/21/2011] [Accepted: 06/25/2011] [Indexed: 11/30/2022]
Abstract
The purpose of the study was to investigate an effect of estrus synchronization with prostaglandin (PG) F(2α) and PMSG/hCG on WNT4, WNT5A, WNT7A, β-catenin (CTNNB1) and E-cadherin (CDH1) gene expression. The weight of the uterus, morphometrical parameters of the endometrium and the number of CL were recorded. The analysis of estradiol (E(2)), prostaglandin (PG) F(2α) and E(2) content in the uterine luminal flushings (ULFs) and progesterone (P(4)) level in the blood serum were conducted. RNA was isolated from endometrial, luteal and embryonic tissue of pregnant non-synchronized (Control; n = 15) and pregnant synchronized (PGF(2α)/PMSG/hCG; n = 15) pigs. Whereas there was no change in uterine weight, differences in height of endometrial surface and glandular epithelium were found. However, height of the endometrium, number of the glands and capillaries were unaffected. The total number of the CLs was higher (P < 0.05) in animals treated with PGF(2α)/PMSG/hCG. The amount of E(2) and P(4) was lower (P < 0.05, P < 0.001, respectively) in pregnant gilts administrated with PGF(2α)/PMSG/hCG. The concentration of PGF(2α) in ULFs was not affected by hormonal management, while PGE(2) was higher (P < 0.01) in hormonally in comparison to non-hormonally treated pigs. The content of WNT4 mRNA in conceptuses increased on particular Days studied in Control and PGF(2α)/PMSG/hCG administered animals. WNT7A and CTNNB1 were affected by PGF(2α)/PMSG/hCG treatment in both conceptuses (P < 0.001, P < 0.05) and endometrial tissue (P < 0.001, P < 0.01). The PGF(2α)/PMSG/hCG treatment resulted in elevated expression of WNT4 (P < 0.001) and CTNNB1 (P < 0.05) in luteal tissue in comparison to the Control gilts. Moreover, luteal amount of WNT5A mRNA was higher in PGF(2α)/PMSG/hCG animals in comparison to the Control group (P < 0.05). Presented data show that exogenous hormones administration can affect gene expression in the porcine reproductive tract and embryo.
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Affiliation(s)
- Jolanta Kiewisz
- Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Olsztyn, Poland
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Influence of Remaining Period of Intravaginal Cream (Progesterone Mixing Cream) Sponge on Synchronous Ovulation, Embryo Collection and Reproductive Performance in Cycling Gilts. ACTA ACUST UNITED AC 2011. [DOI: 10.5938/youton.48.20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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12
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Hu J, Bao J, Ma X, Li W, Lei A, Yang C, Gao Z, Wang H. FSH is superior to eCG for promoting ovarian response in Chinese Bamei gilts. Anim Reprod Sci 2010; 122:313-6. [DOI: 10.1016/j.anireprosci.2010.10.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2010] [Revised: 09/22/2010] [Accepted: 10/01/2010] [Indexed: 11/26/2022]
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13
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Wakai T, Tanaka H, Yamanaka KI, Sugimura S, Sasada H, Kawahara M, Kobayashi E, Sato E. Induction of estrus in pubertal miniature gilts. Anim Reprod Sci 2008; 103:193-8. [PMID: 17543482 DOI: 10.1016/j.anireprosci.2007.04.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2007] [Revised: 04/03/2007] [Accepted: 04/10/2007] [Indexed: 11/28/2022]
Abstract
Genetic engineering of miniature pigs has facilitated the development of numerous biomedical applications, such as xenotransplantation and animal models for human diseases. Manipulation of the estrus is one of the essential techniques for the generation of transgenic offspring. The purpose of the present study was to establish a useful method for induction of the estrus in miniature gilts. A total of 38 pubertal miniature gilts derived from 4 different strains were treated with exogenous gonadotropins. Estrus and ovulatory response were examined after treatment with pregnant mare serum gonadotropin (PMSG) and human chorionic gonadotropin (hCG) as 200 IU PMSG and 100 IU hCG, 300 IU PMSG and 150 IU hCG, or 1,500 IU PMSG only, followed by 100, 150 or 750 IU hCG 72 h later, respectively. The optimal protocol was determined to be the combination treatment of 200 IU PMSG and 100 IU hCG followed by 100 IU hCG. The administration of 200 IU PMSG and 100 IU hCG was effective in inducing estrus regardless of the strain, although there was a strain difference in the ovulatory response. These results indicate that treatment with a low-dose combination of PMSG and hCG provides one of the simplest methods for induction of estrus and ovulation in pubertal miniature pigs.
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Affiliation(s)
- Takuya Wakai
- Laboratory of Animal Reproduction, Graduate School of Agricultural Science, Tohoku University, 1-1 Tsutsumidouri-Amamiyamachi, Aoba-ku, Sendai 981-8555, Japan.
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