Methods of Improving the Accuracy of Positive Results From Milk Progesterone Pregnancy Tests

Eastman, S.A.K.

doi:10.1016/s0007-1935(17)32798-7

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…After the 15th d of pregnancy, levels continue to rise but more slowly, whereas in non-pregnant cows they fall again precipitously about the 18th d again reaching basal levels by about the 21st d. As a result during the period 19-24 d after AI the difference in progesterone level in a single sample of plasma or milk associated with the cow being pregnant or not is so great as to be diagnostic of pregnancy or non-pregnancy with a high degree of confidence. At times other than these, it is still possible to use progesterone levels to diagnose the anovulatory state, the non-pregnant state after normal ovulation and the pregnant state, but the measurement of levels in 2 or more samples collected at appropriate times then becomes necessary (Eastman, 1979). Ball & Jackson (1979) measured progesterone levels in defatted milk from about 10 d before expected oestrus in dairy cattle.…”

Section: Prediction Of Ovulation and Early Pregnancy Diagnosismentioning

confidence: 99%

Hormones in milk: their physiological significance and value as diagnostic aids

Pope¹,

Swinburne²

1980

Journal of Dairy Research

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Preservation of samples Distribution between aqueous and fat phases of milk Concentrations in milk collected at different times of the milking process and at morning and evening milking Relationships of concentrations in plasma to those in milk Research in ovarian physiology Relative value of progesterone concentrations in plasma, whole milk, defatted milk and milk fat Oestrus and ovulation in the early postpartum period

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Section: Prediction Of Ovulation and Early Pregnancy Diagnosismentioning

confidence: 99%

Hormones in milk: their physiological significance and value as diagnostic aids

Pope¹,

Swinburne²

1980

Journal of Dairy Research

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Der Milchprogesterontest: Instrument zur Fruchtbarkeitspflege beim Rind

Holtz¹,

Brackel²,

Kuster³

1986

Journal of Veterinary Medicine Series A

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The milk progesterone test; a means to improve fertility in dairy herdsThe blood progesterone concentration, depending on corpus luteum activity, is reflected by the amount of progesterone in the milk. Since this was discovered in the seventies, dairy farmers and veterinarians are utilizing this fact by having progesterone concentrations determined in milk samples with the purpose of recognizing the respective physiological or pathological state of a cow's ovaries. The practicability of the test is facilitated by the recent availability of quick, cheap methods for determining milk progesterone concentrations.The test may be applied by dairy farmers to examine the proper time of insemination, check for cyclicity and recognize return cows. More complex physiological or pathological ovarian conditions are usually monitored by analysing progesterone concentrations in a sequence of samples usually collected under supervision of a veterinarian. In this context the milk progesterone test may serve as a valuable diagnostic tool to recognize conditions such as silent heat, lack of cyclicity, cystic follicles, retained corpora lutea and irregular cycles. It may also serve to monitor the ovarian response to therapeutical or biotechnical measures or to improve the accuracy of fertility parameters.

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Methods of Improving the Accuracy of Positive Results From Milk Progesterone Pregnancy Tests

Cited by 2 publications

References 3 publications

Hormones in milk: their physiological significance and value as diagnostic aids

Hormones in milk: their physiological significance and value as diagnostic aids

Der Milchprogesterontest: Instrument zur Fruchtbarkeitspflege beim Rind

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