A CIDR-Based Timed Embryo Transfer Protocol Increases the Pregnancy Rate of Lactating Repeat Breeder Dairy Cows

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概要

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• This study evaluated the pregnancy rates following either a controlled internal drug release (CIDR)-based timed artificial insemination (TAI) or an embryo transfer (TET) protocol compared with that following a single PGF2α injection and AI after estrus (AIE) in lactating repeat breeder dairy cows. Fifty-three lactating dairy cows diagnosed as repeat breeders were used in this study and were randomly assigned to the following three treatments. (1) Cows, at random stages of the estrous cycle, received a CIDR device and 2 mg estradiol benzoate (EB; Day 0), a 25 mg PGF2α injection at the time of CIDR removal on Day 7 and a 1 mg EB injection on Day 8. The cows then received TAI 30 h (Day9) after the second EB injection using dairy semen (TAI group, n=13). (2) Cows, at random stages of the estrous cycle, received the same hormonal treatments as in the TAI group. The cows then received TET on Day 16 using frozen-thawed blastocysts or morula embryos collected from Korean native cattle donors (TET group, n=13). (3) Cows, at the luteal phase, received a 25 mg injection of PGF22α and AIE using dairy semen (control group, n=27). The ovaries of the cows in the TET group were examined by transrectal ultrasonography to determine ovulation of the preovulatory follicles, and blood samples were collected for serum progesterone (P4) analysis. The pregnancy rate was significantly higher in the TET group (53.8%) than in the control (18.5%) or TAI (7.7%) groups (P<0.05). The ultrasonographic observations demonstrated that all the cows in the TET group ovulated the preovulatory follicles and concomitantly formed new corpora lutea. Accordingly, the mean serum P4 concentration remained constant between Day 0 and Day 7 of the luteal phase, decreased dramatically on Day 8 (P<0.01) and subsequently increased by Day 16 (P<0.01). These data suggest that the CIDR-based TET protocol can be used to effectively increase the pregnancy rate in lactating repeat breeder dairy cows.

• 日本繁殖生物学会の論文
• 2007-12-01

著者

• Kim Ill-hwa

  韓国

• Cho Sang-rae

  Animal Genetic Resources Station National Institute Of Animal Science Rda

• Kim Ill-hwa

  Laboratory Of Theriogenology College Of Veterinary Medicine Chungbuk National University

• SON Dong-Soo

  Animal Genetic Resources Station, National Institute of Animal Science, RDA

• CHOE Chang-Yong

  Animal Genetic Resources Station, National Institute of Animal Science, RDA

• CHOI Sun-Ho

  Animal Genetic Resources Station, National Institute of Animal Science, RDA

• KIM Hyun-Jong

  Animal Genetic Resources Station, National Institute of Animal Science, RDA

• HUR Tai-Young

  Dairy Cattle Research Division, National Institute of Animal Science, RDA

• JUNG Yeon-Gil

  Department of Animal Science, Daegu University

• KANG Hyun-Gu

  Laboratory of Theriogenology, College of Veterinary Medicine, Chungbuk National University

• Jung Yeon-gil

  Department Of Animal Science Daegu University

• Son Dong-soo

  Animal Genetic Resources Station National Institute Of Animal Science Rda

• Kim Hyun-jong

  Animal Genetic Resources Station National Institute Of Animal Science Rda

• Choe Chang-yong

  Republic Of Korea Animal Genetic Resources Station National Institute Of Animal Science Rda

• Hur Tai-young

  Dairy Cattle Research Division National Institute Of Animal Science Rda

• Song Dong-Soo

  Animal Genetic Resources Station, National Institute of Animal Science, RDA

• Choe Chan-Yong

  Animal Genetic Resources Station, National Institute of Animal Science, RDA

関連論文

• 分娩後子宮内膜炎発症牛の分娩前後における免疫反応
• A CIDR-Based Timed Embryo Transfer Protocol Increases the Pregnancy Rate of Lactating Repeat Breeder Dairy Cows
• The Effect of Reduced Dose and Number of Treatments of FSH on Superovulatory Response in CIDR-Treated Korean Native Cows
• Effect of Exposure Duration of Ovaries and Oocytes at Ambient Temperature on Parthenogenetic Development of Porcine Follicular Oocytes
• The Stability of Nano Fwned Silica Particles and Its Influence on Chemical Mechanical Planarization for Interlayer Dielectrics
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• The Effects of Administering Estradiol Benzoate Plus Progesterone during the Growth or Static Phases of the Dominant Follicle in CIDR-Treated Lactating Dairy Cows
• Synergistic Effects of Glutathione and β-mercaptoethanol Treatment During In Vitro Maturation of Porcine Oocytes on Early Embryonic Development in a Culture System Supplemented with L-cysteine
• Synergistic Effects of Glutathione and β-Mercaptoethanol Treatment During In Vitro Maturation of Porcine Oocytes on Early Embryonic Development in a Culture System Supplemented with L-cysteine
• Immune Responses during the Peripartum Period in Dairy Cows with Postpartum Endometritis
• Comparison of Two Types of CIDR-based Timed Artificial Insemination Protocols for Repeat Breeder Dairy Cows

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