- 期刊
乳牛陰道電阻及性類固醇激素與受胎率之相關性評估
Assessment of Vaginal Impedance and Sex Steroid Hormones with the Related Conception Rate in Dairy Cows
摘要
The aim of this study was to assess the values of vaginal impedance and sex steroid hormones in relation to the conception rate in dairy cows. Thirty-two dairy cows were used to determine the changes of vaginal impedance, serum estradiol (E2), progesterone (P4) and ovarian dynamics throughout the estrous cycle. The results indicated that the values of vaginal impedance and P4 on the day prior to ovulation (D-1, day of ovulation =DO) decreased significantly in comparison with those during diestrus (79.1±11.4Ω vs 114.4±15.7Ω, P＜0.05, 0.4±0.8ng/mL vs 6.2±1.4ng/mL, P＜0.01). All the values of vaginal impedance (79.1±11.4Ω vs 83.4±10.7Ω) did not differ between D-1 and Do. Those 32 cows were inseminated on D-1 and 18 of them were pregnant. The values of F2 on D-1 in pregnant cows were significantly greater than those in non-pregnant cows (30.4±12.0pg/mL vs 18.6±5.1pg/mL, P＜0.01), while no significant difference was noted for the values of vaginal impedance and P4 concentrations. The results also indicated that 32 cows demonstrated a higher conception rate (56.3% vs 45.0%) than that of 40 cows in the control group, however, there was no significant difference between these two groups. Although inseminated cows with lower vaginal impedance on D-1 (≤79Ωvs ＞90Ω) demonstrated a higher conception rate (66.7% vs 25.0%), however, no significant difference was found between these two groups. Besides, abnormal conditions of genital organs in cows, such as follicular cysts, urovagina or pneumovagina, resulted in unreliable values of vaginal impedance. These results suggested that the use of vaginal impedance for predicting the ovulation to improve the conception rate for dairy cows in the field was limited.
並列摘要
The aim of this study was to assess the values of vaginal impedance and sex steroid hormones in relation to the conception rate in dairy cows. Thirty-two dairy cows were used to determine the changes of vaginal impedance, serum estradiol (E2), progesterone (P4) and ovarian dynamics throughout the estrous cycle. The results indicated that the values of vaginal impedance and P4 on the day prior to ovulation (D-1, day of ovulation =DO) decreased significantly in comparison with those during diestrus (79.1±11.4Ω vs 114.4±15.7Ω, P＜0.05, 0.4±0.8ng/mL vs 6.2±1.4ng/mL, P＜0.01). All the values of vaginal impedance (79.1±11.4Ω vs 83.4±10.7Ω) did not differ between D-1 and Do. Those 32 cows were inseminated on D-1 and 18 of them were pregnant. The values of F2 on D-1 in pregnant cows were significantly greater than those in non-pregnant cows (30.4±12.0pg/mL vs 18.6±5.1pg/mL, P＜0.01), while no significant difference was noted for the values of vaginal impedance and P4 concentrations. The results also indicated that 32 cows demonstrated a higher conception rate (56.3% vs 45.0%) than that of 40 cows in the control group, however, there was no significant difference between these two groups. Although inseminated cows with lower vaginal impedance on D-1 (≤79Ωvs ＞90Ω) demonstrated a higher conception rate (66.7% vs 25.0%), however, no significant difference was found between these two groups. Besides, abnormal conditions of genital organs in cows, such as follicular cysts, urovagina or pneumovagina, resulted in unreliable values of vaginal impedance. These results suggested that the use of vaginal impedance for predicting the ovulation to improve the conception rate for dairy cows in the field was limited.
延伸閱讀
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- 王思涵、李國華、張俊達、陳怡璇、陳一明、賈玉祥（2016）。乳牛轉換期餵飼草本複方添加物對於泌乳生產及繁殖性能之影響。畜產研究，49(3)，194-200。https://www.airitilibrary.com/Article/Detail?DocID=P20200930001-201609-202010210018-202010210018-194-200
- 李春芳、陳吉斌（2005）。增加懷孕後期飼糧能量對初產女牛泌乳性能與生長的影響。畜產研究，38(3)，165-174。https://www.airitilibrary.com/Article/Detail?DocID=P20200930001-200509-202011160011-202011160011-165-174
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