Effect of the Ovsynch protocol on ovarian changes
and pregnancy rates after first insemination in lactating cows
with or without puerperal metritis

V. Juodžentis; J. Šiugždaitė; G. Palubinskas; D. Juodžentė; V. Žilaitis; N. Sutkevičienė; H. Žilinskas

doi:10.22358/jafs/151567/2022

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ORIGINAL PAPER

Effect of the Ovsynch protocol on ovarian changes and pregnancy rates after first insemination in lactating cows with or without puerperal metritis

V. Juodžentis ^1,2

J. Šiugždaitė ³

G. Palubinskas ²

D. Juodžentė ⁴

V. Žilaitis ¹

N. Sutkevičienė ¹

H. Žilinskas ¹

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Lithuanian University of Health Sciences, Faculty of Veterinary, Veterinary Academy, Large Animals Clinic, LT-47181 Kaunas, Lithuania

Lithuanian University of Health Sciences, Faculty of Animal Sciences, Veterinary Academy, Animal Breeding Department, LT-47181 Kaunas, Lithuania

Lithuanian University of Health Sciences, Faculty of Veterinary, Veterinary Academy, Department of Veterinary Pathobiology, LT-47181 Kaunas, Lithuania

Lithuanian University of Health Sciences, Faculty of Veterinary, Veterinary Academy, Dr. L. Kriaučeliūnas Small Animal Clinic, LT-47181 Kaunas, Lithuania

Publication date: 2022-09-09

Corresponding author

V. Juodžentis

Large Animals Clinic, Faculty of Veterinary, Veterinary Academy, Lithuanian University of Health Sciences, Tilžės str. 18, LT-47181, Kaunas, Lithuania.

J. Anim. Feed Sci. 2022;31(4):310-317

DOI: https://doi.org/10.22358/jafs/151567/2022

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Supplementary files

1456_Juodžentis et al_abstract_china.pdf

References (43)

KEYWORDS

cow

TOPICS

reproduction - female

physiology

ABSTRACT

The aim of this study was to determine how puerperal metritis affects pregnancy rates and ovarian changes in dairy cows synchronised with the Ovsynch protocol. The study included 72 cows, which were divided into two groups. Cows treated for puerperal metritis were defined as Group M (n = 34), and those without signs of puerperal metritis as Group H (n = 38). Cows were synchronised for the first artificial insemination (AI) on day 49 ± 3 postpartum using a modified Ovsynch protocol. The number of cows that ovulated after the first injection of gonadotropin-releasing hormone (G1) was similar between Group H and Group M (36.84 and 23.53%, respectively; P > 0.05). At G1, the size of dominant follicles was smaller in healthy nonovulated subgroup (HNO) compared to metritic an-ovulated cows (MNO) (P < 0.05). Furthermore, the volume of corpus luteum was lower in the subgroup of metritic ovulated cows (MO) compared to healthy ovulated cows (HO) (P < 0.05). At the time of prostaglandin F2α treatment, progesterone (P4) levels in subgroups HO and MO were > 1 ng/ml, and they were different compared to subgroups HNO and MNO (P < 0.05). The study showed that at the time of the second injection of gonadotropin-releasing hormone (G2), follicle size was larger in Subgroup MO compared to Subgroup HO (P < 0.05). In conclusion, at the time of synchronisation, P4 concentration and luteal volume size was lower in metritic cows compared to healthy counterparts. However, pregnancy and embryo mortality rates were similar between metritic and healthy cows.

ACKNOWLEDGEMENTS

This study was supported by the Science Foundation of the Lithuanian University of Health Sciences (LUHS).

CONFLICT OF INTEREST

The Authors declare that there is no conflict of interest.

METADATA IN OTHER LANGUAGES:

Chinese

Ovsynch方案对罹患产后子宫炎和健康泌乳奶牛首次授精后的卵巢变化和妊娠率的影响

摘要: 本研究目的是确定采用Ovsynch方案进行同期排卵处理后产后子宫炎如何影响奶牛妊娠率和卵巢变化。72头奶牛被分成两组：罹患产后子宫炎奶牛为M组（n = 34），无产后子宫炎奶牛为H组（n = 38）。奶牛在产后49 ± 3天采用改良的同期排卵方案（Ovsynch）进行第一次人工授精（Artificial insemination，AI）。H组和M组第一次注射促性腺激素释放激素（Gonadotropin-releasing hormone，G1）后奶牛排卵数无显著差异（分别为36.84%和23.53% ，P > 0.05）。注射G1后，健康未排卵组（Healthy non-ovulated subgroup，HNO）奶牛优势卵泡的体积显著小于罹患子宫炎的排卵期奶牛（Metritic an-ovulated，MNO）（P < 0.05）。此外，罹患子宫炎的已排卵奶牛（Metritic ovulated cows，MO）组的黄体体积显著低于健康已排卵奶牛（Healthy ovulated cows，HO）（P < 0.05）。注射前列腺素（Prostaglandin F2 α，PGF2α）后，HO和MO组奶牛的孕酮（Progesterone，P4）水平均大于1 ng/ml，与HNO和 MNO组比较差异显著（P < 0.05）。结果表明，第二次注射G2时，MO组卵泡体积显著大于 HO组（P < 0.05）。研究结果表明，在同期排卵处理时，与健康奶牛相比，罹患子宫炎奶牛的P4浓度和黄体容积较低。然而，罹患子宫炎奶牛和健康奶牛的妊娠和胚胎死亡率相似。

REFERENCES (43)

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