ผลของระยะเวลาสอดอุปกรณ์เหนี่ยวนำต่อระดับฮอร์โมนโปรเจสเตอโรน เอสตราไดออล อัตราการเป็นสัด และการตั้งท้องในโคเนื้อ
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บทคัดย่อ
The objective of this study to compare the effect of time insertion with control internal drug release
device on progesterone (P4) level, estradiol (E2) level, estrus and pregnancy rates in beef cattle.
Forty-seven beef cows not showing estrus after 60 days after birth were used in this study. Two groups
cows were inserted CIDR on day 0, and then removed on day 7 (n=27) or day 14 (n=20) followed by
PGF2α injection. Cows were artificial inseminated (AI) at 55 hours after CIDR removal with injection of
Gonadotropin releasing hormone. Blood samples were taken to determine concentrations of P4 and E2 on
the day of insert, removal CIDR and AI. The pregnancy diagnosis was performed on days 45 and 90 after
AI. Data were analyzed by R-program with two-independent sample t-test at 95% confidence interval
(P = 0.05). The P4 level on the day of insertion removal and AI were not significantly different of
Co-Synch+CIDR 7 days group (16.41±1.05, 17.00±1.60 and 13.12±1.09 ng/ml, respectively) vs
Co-Synch+CIDR 14 days group (13.68±0.95, 16.93±1.19 and 16.41±1.61 ng/ml, respectively, P > 0.05).
Similarly, E2 level on the day of insertion remove and AI had no difference between 7 days group (7.38±2.16,
6.48±2.04 and 8.70±2.08 ng/ml, respectively) vs (13.68±0.95, 16.93±1.19 and 16.41±1.61 ng/ml,
respectively). Estrus rate of Co-Synch+CIDR 7 days group was higher than 96.29% (26/27) vs
Co-Synch+CIDR 14 days 85% (17/20) (P > 0.05). The pregnancy rate on Co-Synch+CIDR 7 days group
being 40.74% (11/27) was higher value than in Co-Synch+CIDR 14 days groups (25%, 5/20). In conclusion,
synchronization protocols using Co-Synch+CIDR 7 vs 14 days were not significantly different of P4 and E2
levels. Pregnancy rate of Co-Synch+CIDR 7 days group have better potential than Co-Synch+CIDR 14
days group. Co-Synch+CIDR can be applied to solve the problem of anestrous cows after calving.
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References
การเลีย้ งแมพ่ นั ธโ์ุ คเนือ้ และความพงึ พอใจของเกษตรกรในพืน้ ที่อเภอเมอื งแม่ใจ ดอกคำใต้และภูกามยาว จังหวัดพะเยา. ว.วิจัย
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