Evaluation of a cow‐side milk progesterone assay and assessment of the positive predictive value of oestrus diagnosis by dairy farmers in New South Wales

Ingenhoff, L; Hall, Evelyn; House, John K.

doi:10.1111/avj.12532

Cited by 8 publications

(4 citation statements)

References 16 publications

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“…To omit GnRH treatment in the EPreg subgroup, it is desired to establish a real‐time or cow‐side pregnancy diagnosis method on Day 23. Among the many procedures that have been proposed for early pregnancy diagnosis in the cow, a milk P 4 qualitative stick (Ingenhoff et al., 2016) and luteal vasculature imaging with Doppler ultrasonography (Herzog et al., 2010; Kanazawa et al., 2016) might be promising.…”

Section: Discussionmentioning

confidence: 99%

Development of the Timed Re‐Insemination (TRI‐synch) program re‐inseminating 24 days after the initial service in dairy cows

Aizu

Ido-Matsumoto

Wada

et al. 2020

Animal Science Journal

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For the timed re‐insemination at the minimal interbreeding interval, cows were treated with a progesterone (P4)‐releasing intravaginal device from Days 13–15 to 21 post‐insemination (Day 0 = estrus), followed by plasma P4 assay on Day 23 and then subjected to the Experiments 1 and 2. In Experiment 1, of 18 cows, 6 cows were determined as luteolysis with low (<1 ng/ml) plasma P4 concentrations on Day 23 and ovulated on Days 24 (3 cows), 25 (1 cow), and 26 (1 cow) except a cow affected by ovarian quiescence. In Experiment 2, all cows were treated with GnRH on Day 23. Cows with low (<1 ng/ml) plasma P4 concentrations on Day 23 were diagnosed as non‐pregnant and subjected to the re‐insemination in the morning of Day 24 irrespective of estrous signs. Of 36 cows, 15 cows were diagnosed as being non‐pregnant on Day 23. Fourteen cows of the non‐pregnant animals were re‐inseminated in the morning of Day 24 irrespective of estrous signs and the pregnancy rate of re‐insemination was 36%. The conception rates of initial and re‐inseminations were 50% (18/36) and 36% (5/14), respectively. The overall pregnancy rate by adding the rates of initial and re‐inseminations was 64% (23/36).

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Section: Discussionmentioning

confidence: 99%

Development of the Timed Re‐Insemination (TRI‐synch) program re‐inseminating 24 days after the initial service in dairy cows

Aizu

Ido-Matsumoto

Wada

et al. 2020

Animal Science Journal

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show abstract

“…The second study looks at the sensitivity and specificity of the cow-side P4 Rapid milk progesterone assay. 2 Dairy herd reproductive performance relies heavily on the accuracy (i.e. positive predictive value, PPV) and efficiency of heat detection by farm personnel.…”

Section: Production Animalsmentioning

confidence: 99%

“…The second study looks at the sensitivity and specificity of the cow‐side P4 Rapid milk progesterone assay . Dairy herd reproductive performance relies heavily on the accuracy (i.e.…”

Section: Production Animalsmentioning

confidence: 99%

In this issue – December 2016

Jackson¹

2016

Aust Veterinary J

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“…The measurement of bovine P4 has evolved over the past four to five decades from laboratory based radio-immunoassay through enzyme-linked immunosorbent assay (ELISA) techniques to cow-side lateral flow tests or in-milk-line monitoring (Samsonova et al, 2018). The cow-side P4 Rapid lateral flow test was developed in the UK (Ridgeway Science, UK) and studies comparing its performance to other assay methods have been published (Ingenhoff et al, 2016;Kočíková et al, 2019;Muasa, 2020;Omontese et al, 2020;Waldmann & Raud, 2016).…”

Section: Introductionmentioning

confidence: 99%

Use of a cow-side oestrus detection test for fertility management in Kenyan smallholder dairy herds.

Peters

Wong²,

Williams³

et al. 2022

Gates Open Res

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Background: The use of artificial insemination (AI) has great potential to improve smallholder dairy herds in Africa, however poor success and, in some situations, high costs in Kenya, have been discouraging. Effective AI requires accurate oestrus detection and the measurement of progesterone (P4) can be used to indicate oestrus as well as non-pregnancy. A cow-side progesterone lateral flow test, P4 Rapid, was evaluated as an aid to detect oestrus and non-pregnancy in Kenyan dairy cows, and assessed for association with AI efficiency. Methods: A total of 527 cows were enrolled in the study, from two counties in central and southern Kenya. Cattle in the test group (n = 308) were presented when suspected to be in oestrus and tested with the P4 Rapid (low P4 = oestrus, medium P4 = inconclusive, high P4 = not in oestrus/pregnant). Cattle with low P4 were inseminated. Cattle in the control group (n = 219) were inseminated when oestrus behaviour was detected i.e. standard practice. Results: Of the total P4 Rapid tests performed (n = 745), 1.5% were inconclusive, with the true accuracy of the test between 87-97%. Conception rates were not significantly higher in the test group (83.9%) compared to the control group (77.9%). Abortion rates were not significantly different between the control (9.5%) and test groups (8.2%). In the test group, 6.2% (19/308) cows showed a medium or high P4 level on day 0 and nine of these were subsequently found to have been already pregnant. Conclusions: The data indicated that the P4 Rapid test can be a useful tool to assist farmer decision-making in the confirmation of correct timing for AI, and importantly may avoid unnecessary inseminations in pregnant animals, thus reducing the risk of AI-induced abortion.

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Evaluation of a cow‐side milk progesterone assay and assessment of the positive predictive value of oestrus diagnosis by dairy farmers in New South Wales

Cited by 8 publications

References 16 publications

Development of the Timed Re‐Insemination (TRI‐synch) program re‐inseminating 24 days after the initial service in dairy cows

Development of the Timed Re‐Insemination (TRI‐synch) program re‐inseminating 24 days after the initial service in dairy cows

In this issue – December 2016

Use of a cow-side oestrus detection test for fertility management in Kenyan smallholder dairy herds.

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