Early pregnancy diagnosis using color doppler ultrasonographic monitoring of luteal blood flow and growth dynamics in cattle
| dc.contributor.advisor | S. JEYAKUMAR | |
| dc.contributor.author | Majumder, Kaushik | |
| dc.date.accessioned | 2023-12-04T09:53:21Z | |
| dc.date.available | 2023-12-04T09:53:21Z | |
| dc.date.issued | 2022 | |
| dc.description.abstract | Early pregnancy diagnosis is a fundamental aspect of reducing the calving interval by identifying open animals early and rebreeding them as soon as possible. The Corpus luteum (CL) is a highly vascularized transitory endocrine gland that produces progesterone to support pregnancy. Luteal blood flow is a more accurate predictor of the CL function and serum P4 concentration than the CL size, particularly during the CL's regression phase. In this context, the evaluation of luteal blood flow by color Doppler ultrasonography can be a reliable parameter for diagnosing pregnancy. The aim of this study was to evaluate the CL growth dynamics and luteal blood flow changes in relation to early pregnancy. Multiparous (n=18) Deoni cows between 3-5 parity were selected for this study. Ultrasonographic examination and serum progesterone estimation was performed on days 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 33, 40, and 47 after estrus or until exhibition of next estrus, with or without insemination. Grayscale (B-mode) wasused for examining CL morphometry like diameter, tissue area, volume, and color-flow Doppler was used for assessing luteal blow area. Deoni cows were retrospectively allocated as being pregnant (n=6) or non-pregnant (interoestrus interval 18-21 days; n=6) by per rectal pregnancy diagnosis method on day 47, and were compared with nonbred cyclic control Deoni cows (n=6). The results revealed that the CL morphometry and blood flow area were progressively increasing from day 5 to 47 of the gestation period in pregnant cows, whereas it decreased from day 19 in inseminated non-pregnant and cyclic control cows. The CL diameter, volume and tissue area of pregnant cows was significantly higher than non-pregnant, and cyclic control (P<0.05) on day 19. Similarly, corpus luteal blood flow area was significantly higher (P<0.05) on day 19 in pregnant than in non-pregnant, or cyclic control cows. Though the CL vascularity index showed a similar trend, there was no significant difference between the groups. The serum P4 concentration declined from day 17 in non-pregnant and cyclic control cows and on day 19 it was significantly higher (P<0.05) in pregnant cows. In the present study, the CL morphometry and luteal blood flow on day 19 was significantly higher in pregnant than non-pregnant cows and are reflective of serum P4 concentration. Therefore, it was concluded that CL morphometry and CL blood flow area could be potential non-invasive predictors for early pregnancy diagnosis on day 19 in Deoni cows. | |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810202085 | |
| dc.language.iso | English | |
| dc.pages | 57 p. | |
| dc.publisher | ICAR-SRS-NDRI, KARNAL | |
| dc.sub | Veterinary Gynaecology and Obstetrics | |
| dc.theme | Veterinary Gynaecology and Obstetrics | |
| dc.these.type | M.V.Sc. | |
| dc.title | Early pregnancy diagnosis using color doppler ultrasonographic monitoring of luteal blood flow and growth dynamics in cattle | |
| dc.type | Thesis |