Progesterone concentration in defatted milk of dairy cows in early pregnancy

Noseir, M.B.; Gyawu, P.; Pope, G. S.

doi:10.1016/0007-1935(92)90066-a

Cited by 4 publications

(1 citation statement)

References 18 publications

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“…Cows that were in oestrus at the second round of AI were expected to have a concentration of progesterone in milk < 2.0 ng/mL for the first 3 days of the oestrous cycle. 8,9 Concentrations of progesterone were determined in whole milk using a radioimunoassay kit validated for milk (Spectria Veterinary Progesterone RIA kit, Orion Diagnostica, Espoo, Finland). The sensitivity of the assay was 0.5 ng/mL.…”

Section: Scientificmentioning

confidence: 99%

Role of the sensitivity of detection of oestrus in the submission rate of cows treated to resynchronise oestrus

Cavalieri

Eagles²,

Ryan

et al. 2003

Aust Veterinary J

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Section: Scientificmentioning

confidence: 99%

Role of the sensitivity of detection of oestrus in the submission rate of cows treated to resynchronise oestrus

Cavalieri

Eagles²,

Ryan

et al. 2003

Aust Veterinary J

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Skim milk progesterone in pregnant cows from insemination throughout lactation

Eissa

Refsal

1994

Vet Res Commun

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The skim milk progesterone profile was assessed by radioimmunoassay, without extraction, from the day of insemination (day 0) until the cows were dried off on day 225 of gestation. A total of 418 samples were collected from 154 pregnant Holstein cows. The daily variation in skim milk progesterone was recorded from day 1 until day 45 of pregnancy to detect the commencement of progesterone secretion from the corpus luteum after insemination. Subsequent determinations were made every 2 weeks from day 46 until lactation ceased. On the day of artificial insemination and for the first 2 days after insemination, all the cows had a basal progesterone concentration < 0.1 ng/ml. A rise in progesterone (0.2 +/- 0.1 ng/ml) was first detected on the third day after insemination. The progesterone values then increased significantly (p < 0.001) until day 15. The values then remained nearly constant (2.5-3.5 ng/ml) until day 106 of pregnancy, when they began to decline. Between days 120 and 180 of gestation, progesterone was significantly decreased (2.2-2.9 ng/ml) before it rose again to the previous plateau (3.5-3.9 ng/ml) around day 180. The progesterone concentration then remained at the higher level until the animals were dried off.

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