Ovarian response to prostaglandin F&lt;sub&gt;2α&lt;/sub&gt; in lactating dairy cows: A clinical update

López‐Gatius, F.

doi:10.1262/jrd.2021-119

Cited by 2 publications

(2 citation statements)

References 98 publications

(144 reference statements)

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“…A separate study (Hatler et al, 2003) noted that 66 % of ovarian cysts in dairy cattle were associated with suprobal levels of progesterone, which blocks preovulatory elevated luteinizing hormone levels but does not suppress pulsatility as it occurs with average luteal progesterone concentrations. That is, an anovulatory persistent follicle begins to develop with a larger diameter and longer duration of existence than usual, along with an increase in peripheral estradiol concentrations (López-Gatius, 2022).…”

Section: Postpartum Complications In Cows Are Associated With Hormona...mentioning

confidence: 99%

Postpartum complications in cows: diagnosis, treatment, prevention

Chabanenko,

Zhelavskyi,

Skliarov

et al. 2024

Ukr. Jour. of Vet. and Agr. Sci.

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This review contains an analysis of domestic and foreign researchers regarding the occurrence of postpartum complications in cows, which represents a significant veterinary problem. Diagnostic methods and treatment regimens for postpartum pathologies of various origins are presented. Difficulties and errors in diagnosing uterine inflammation lead to improper treatment, prolonged infertility, and significant economic losses. Based on an analysis of the literature, it has been proven that clinical forms of endometritis often develop into a subclinical course. The proportion of hidden endometritis can account for up to 80 % of the total amount of endometrial inflammation. The problem with postpartum complications of the uterus is that the inflammatory processes spread to the ovaries, and this can lead to complete infertility in animals. Rectal examination of cows remains one of the primary methods for diagnosing endometritis. Treatment generally involves the use of a wide range of antibiotics. Data on the hormonal causes of postpartum pathologies of the reproductive system of cows are also presented. A big problem is follicular and luteal cysts, their timely diagnosis and appropriate treatment. The leading cause of cysts is a disruption of the hypothalamic-pituitary-gonadal axis. A practical method for diagnosing cysts is ultrasound, and the type of cyst can be determined by the level of progesterone in the blood. A practical method of treating cysts is the use of hormonal drugs. Data are also presented confirming the significant role of microflora in the occurrence of inflammatory changes in the reproductive organs of cows. The main types of causative agents of inflammatory processes in the genital organs of cows in the postpartum period are given. In cows with endometritis, an imbalance of the uterine microflora is detected, and the growth of bacteria of the genus Bacteroidetes and Fusobacteria with a simultaneous decrease in the number of Proteobacteria and Tenericutes. Data are presented that rumen acidosis can cause inflammation of the uterus, and this is associated with the penetration of Fusobacterium necrophorum into the blood circulation. The effectiveness of intravaginal treatment of cows with a mixture of lactic acid bacteria (L. rhamnosus, P. acidilactici, and L. reuteri) has been shown.

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Section: Postpartum Complications In Cows Are Associated With Hormona...mentioning

confidence: 99%

Postpartum complications in cows: diagnosis, treatment, prevention

Chabanenko,

Zhelavskyi,

Skliarov

et al. 2024

Ukr. Jour. of Vet. and Agr. Sci.

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“…The risk of the ageing of gametes, particularly the postovulatory oocyte, becomes critical at the time of AI in cattle [ 28 , 29 , 30 ]. Owing to the challenges of correctly detecting estrus, hormonal protocols for fixed-time AI (FTAI) have been incorporated into routine intensive dairy farming reproductive management programs [ 31 , 32 , 33 , 34 ]. However, most Ais worldwide are performed at spontaneous estrus and hormone treatments have met with strong consumer opposition in some countries.…”

Section: Introductionmentioning

confidence: 99%

Revisiting the Timing of Insemination at Spontaneous Estrus in Dairy Cattle

López‐Gatius¹

2022

Animals

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Cows show spontaneous estrus over 8–20 h but become refractory to the bull about 10–12 h before ovulation. This indicates that ovulation occurs 10–12 h after the end of estrus behavior, yet spermatozoa from the bull ejaculate need to undergo maturation and capacitation for 6 to 8 h in the female reproductive tract before they are capable of fertilization. Traditionally, the onset of estrus has been considered the best timing for artificial insemination (AI) in cattle, that is, 6 to 24 h from the first signs of estrus. However, recent findings suggest this interval should be reduced to 16 to 6 h before ovulation, bringing it closer to the end of estrus. In this review, the end of estrus rather than its onset is proposed as the best guide for AI timing in dairy cattle, and physiological indicators of late estrus are discussed such as relaxation of the intravaginal part of the uterus, a lower cervical mucus viscosity and a softer pre-ovulatory follicular consistency as simple cues indicating a cow is ready for service.

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Ovarian response to prostaglandin F<sub>2α</sub> in lactating dairy cows: A clinical update

Cited by 2 publications

References 98 publications

Postpartum complications in cows: diagnosis, treatment, prevention

Postpartum complications in cows: diagnosis, treatment, prevention

Revisiting the Timing of Insemination at Spontaneous Estrus in Dairy Cattle

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