The Effects of Administering Estradiol Benzoate Plus Progesterone during the Growth or Static Phases of the Dominant Follicle in CIDR-Treated Lactating Dairy Cows

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概要

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• We studied the effects of administering estradiol benzoate (EB) plus progesterone (P4) as part of a CIDR-based protocol during the growth or static phases of dominant follicle development on follicular wave emergence, follicular growth, synchrony of ovulation, and pregnancy rate following CIDR withdrawal, treatment with PGF2α and GnRH, and fixed-time AI (TAI). Forty-one previously synchronized lactating Holstein dairy cows were randomly allocated to three treatment groups. The control group (n=14) received a CIDR on the third day after ovulation only (Day 0). The two treatment groups were administered CIDRs comprising 2 mg EB and 50 mg P4 either on the third (T1, n=14) or eighth day (T2, n=13) after ovulation (Day 0). All cows received PGF2α after CIDR removal on Day 7, GnRH on Day 9, and TAI 16 h after GnRH treatment. The proportion of cows with follicular wave emergence within 8 days of treatment differed (P<0.01) among the control (14.3%), T1 (85.7%), and T2 groups (92.9%). However, the mean intervals between treatment and wave emergence were not significantly different. There were significant differences in the diameters of the dominant follicles on Day 7 (P<0.01) and in preovulatory follicles on Day 9 (P<0.01), with the largest follicles observed in the control group and the smallest follicles observed in the T2 group. In contrast, the numbers of cows showing synchronous ovulation after GnRH treatment (92.9 to 100.0%) and pregnancy following TAI (46.2 to 50.0%) were similar between the treatment groups. The results showed that, irrespective of the phase (growth or static) of the dominant follicle, administration of 2 mg EB plus 50 mg P4 to CIDR-treated lactating dairy cows induced consistent follicular wave emergence and development, synchronous ovulation after GnRH administration, and similar pregnancy rates following TAI.

• 日本繁殖生物学会の論文

著者

• Kim Ill-hwa

  Laboratory Of Theriogenology College Of Veterinary Medicine Chungbuk National University

• HUR Tai-Young

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

• KANG Hyun-Gu

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

• KIM Ui-Hyung

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

• SUH Guk-Hyun

  Dairy Cattle Research Division, National Livestock Research Institute

• KANG Seog-Jin

  Dairy Cattle Research Division, National Livestock Research Institute

• PARK Soo-Bong

  Dairy Cattle Research Division, National Livestock Research Institute

• KIM Hyeon-Shup

  Dairy Cattle Research Division, National Livestock Research Institute

• Hur Tai-young

  Dairy Cattle Research Division National Institute Of Animal Science Rda

• KIM Ill-Hw

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

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