Luteal blood flow measured by Doppler ultrasonography during the first three weeks after artificial insemination in pregnant and non-pregnant Bos indicus dairy cows

The objective of this study was to determine if there are differences in luteal size (LS), progesterone (P4), and luteal blood flow (LBF) between pregnant and non-pregnant Bos indicus dairy cows during the first three weeks after insemination, and whether these parameters are related to each other....

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Bibliographic Details
Published in:Journal of Reproduction and Development 2019, Vol.65(1), pp.29-36
Main Authors: HASSAN, Mubbashar, ARSHAD, Usman, BILAL, Muhammad, SATTAR, Abdul, AVAIS, Muhammad, BOLLWEIN, Heinrich, AHMAD, Nasim
Format: Article
Language:English
Subjects:
Artificial insemination
Blood flow
Body weight
Bos indicus dairy cows
Cattle
Doppler effect
Doppler ultrasound
Embryos
Estrus cycle
Luteal blood flow
Original
Ovaries
Pregnancy
Progesterone
Ultrasonic imaging
Ultrasound
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Summary:The objective of this study was to determine if there are differences in luteal size (LS), progesterone (P4), and luteal blood flow (LBF) between pregnant and non-pregnant Bos indicus dairy cows during the first three weeks after insemination, and whether these parameters are related to each other. Lactating cows (n = 13) of mixed parity with a body weight of 430 ± 18 kg (mean ± SD), showing regular estrous cycle were used in the study. All cows were artificially inseminated and were classified as pregnant (embryonic heartbeat on day 30; n = 8) or non-pregnant (inter-estrus interval 17 to 21 days, n = 5). In order to compare the LS and LBF after artificial insemination, B-mode and color Doppler ultrasonography of ovaries were performed on days 4, 5, 6, 7 (first week), 8, 10, 12, 14, (second week), and 16, 17, 18, 19, 20, 21 (third week) in pregnant and non-pregnant cows. Results revealed that the mean LBF was consistently higher (P < 0.05) during days 7 through 21 in pregnant cows than in non-pregnant cows. The mean LS was higher (P < 0.05) on days 6 and 7, and from day 17 onwards, and the mean concentration of P4 was higher (P < 0.05) on days 19, 20, and 21 in pregnant cows. In conclusion, LBF is a more sensitive parameter than LS and P4 for detection of differences in luteal function between pregnant and non-pregnant Bos indicus dairy cows during the first three weeks after AI.
ISSN:0916-8818
1348-4400
DOI:10.1262/jrd.2018-084