Effect of Follicular Aspiration at the Onset of Progesterone-based Timed Artificial Insemination on the Follicular Dynamics and Fertility of Early Postpartum Japanese Black Cows

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概要

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• The effect of gonadotropin-releasing hormone analogue (GnRH-A) or follicular aspiration at the onset of progesterone-based timed artificial insemination (TAI) on subsequent follicular growth and synchronization of ovulation was examined in early postpartum Japanese Black cows. A total of 40 (22 in Exp. 1 and 18 in Exp. 2) Japanese Black cows at 20-30 days postpartum were fitted with a progesterone releasing internal device (PRID) for 7 days, injected with a prostaglandin F2α analogue upon removal of the PRID and GnRH-A 48 h later, and inseminated 18 h after GnRH-A injection. In Exp. 1, the animals were divided into three groups (untreated control, GnRH-A injection or follicular aspiration) of different treatments on the first day of PRID insertion (day 0), and the synchronized ovulation rate in the follicular aspiration group (100%; 8/8) tended to be higher (P=0.077) than that in the control group (42.9%; 3/7). In Exp. 2, follicular growth in the GnRH (n=9) and follicular aspiration (n=9) groups was monitored by ultrasonography. Four out of the nine animals in the GnRH group had a corpus luteum on either day 4 or day 7 (OV group), and the other five animals had no induced ovulation (NOV group). The diameter of the ovulatory follicle on day 9 in the OV group (1.44 ± 0.11 cm) tended to be greater (P=0.078) than that in the NOV group (1.13 ± 0.07 cm). Follicular aspiration at the onset of PRID-based TAI of early postpartum Japanese Black cows, regardless of the resumption of ovarian cyclicity, tended to result in a higher rate of synchronization of ovulation than that of the untreated controls.

著者

• OSAWA Takeshi

  Faculty of Agriculture, Iwate University

• Hirata Toh-ichi

  Faculty Of Agriculture Iwate University

• Hirata Toh-ichi

  Department Of Veterinary Medicine Faculty Of Agriculture Iwate University

• KON Naoki

  Faculty of Agriculture, Iwate University

• SUGIYAMA Akane

  Faculty of Agriculture, Iwate University

• SATO Mai

  Faculty of Agriculture, Iwate University

• Kon Naoki

  Faculty Of Agriculture Iwate University

関連論文

• Basal Levels and GnRH-induced Responses of Peripheral Testosterone and Estrogen in Holstein Bulls with Poor Semen Quality
• Effect of Suckling on Embryo Production by Repeated Ovum Pick-Up Before and After Timed Artificial Insemination in Early Postpartum Japanese Black Cows
• 卵巣静止および正常発情周期を示す肉用牛における排卵同期化プログラムの有効性の比較
• Applicability of a Progesterone-Based Timed Artificilal Insemination Protocol after Follicular Fluid Aspiration Using the Ovum Pick-up Technique in Suckled Beef Cows
• Characteristics of the Stimulatory Effect of Kisspeptin-10 on the Secretion of Luteinizing Hormone, Follicle-Stimulating Hormone and Growth Hormone in Prepubertal Male and Female Cattle
• Effect of Follicular Aspiration at the Onset of Progesterone-based Timed Artificial Insemination on the Follicular Dynamics and Fertility of Early Postpartum Japanese Black Cows
• Applicability of a Progesterone-Based Timed AI Protocol after Follicular Fluid Aspiration Using the Ovum Pick-up Technique in Suckled Beef Cows
• Basal Levels and GnRH-induced Responses of Peripheral Testosterone and Estrogen in Holstein Bulls with Poor Semen Quality
• Effect of Follicular Aspiration at the Onset of Progesterone-based Timed Artificial Insemination on the Follicular Dynamics and Fertility of Early Postpartum Japanese Black Cows

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