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題名 | 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 |
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作者 | 莊士德; 穆昭安; 陳鵬文; Chuang, Shih-te; Mu, Chao-an; Chan, Jacky Peng-wen; |
期刊 | 臺灣獸醫學雜誌 |
出版日期 | 20080600 |
卷期 | 34:2 2008.06[民97.06] |
頁次 | 頁85-89 |
分類號 | 437.39 |
語文 | chi |
關鍵詞 | 陰道電阻; 性類固醇激素; 受胎率; 乳牛; Conception rate; Dairy cows; Sex steroid hormones; Vaginal impedance; |
中文摘要 | 為評估乳牛陰道電阻以及性類固醇激素等變化與其配種受胎率之相關性,以超音波監測32頭完整動情週期牛隻之卵巢變化,同時測量其血清雌二醇、孕酮等濃度以及陰道腹側黏液電阻。結果顯示,於排卵前一天(D-1,以排卵為第0天=D0)其陰道電阻顯著低於動情週期第10-12天之陰道電阻(79.1±11.4Ωvs 11.44±15.7Ω, P < 005),且與血清孕酮濃度的變化一致。32頭實驗組的乳牛於D-1天與DO天的陰道電阻並無顯著差異(79.1±11.4Ωvs83.4±10.7D)。實驗組乳牛於D-1天行人工授精後,有18頭受孕。18頭懷孕牛隻於D-1天,其雌二醇濃度顯著高於未懷孕牛隻(30.4±12.0pg/mL vs 18.6±5.1pg/mL, P<001),但其陰道電阻及血清孕酮濃度等變化在兩組間皆不具顯著性差異。實驗組32頭牛於D-1天之陰道電阻越小者,其配種受孕率越高(≤79Ω, 66.7% vs> 90Ω,25.0%),但兩者不具顯著性差異。32頭實驗組牛隻其懷孕率雖較40頭對照組高(56.3% vs 45.0%),但兩者亦無顯著性差異。此外,患有氣膣、尿膣或濾泡囊腫的牛隻,其陰道電阻的測量值無法顯示其可靠性。此實驗結果顯示,以測量陰道電阻來預測牛隻發情排卵以提高受胎率於牧場的應用上是有限的。 |
英文摘要 | 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. |
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