Levels of Hormones in the Serum of Cycling Beef Cows

Christensen, D. S.; Hopwood, M. L.; Wiltbank, J. N.

doi:10.2527/jas1974.383577x

Cited by 35 publications

(13 citation statements)

References 8 publications

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“…The variation in plasma progesterone levels during the normal oestrous cycle is very similar to that reported by other workers (Glencross Domeki et al 1972Shemesh et al 1972Blockey et al 1972Christensen et al 1974Dobson et al 1973Wettemann et al 1972Henricks et al 1971Glencross et al 1973Echternkamp & Hansel 1971Batson et al 1973 This paper Pope et at. 1965 (1) Fluorometry, (2) CPB with chromatography, (3) RIA without chromatography, (4) RIA with chromatography, (5) et al 1970).…”

Section: Discussionsupporting

confidence: 88%

Plasma hormone levels in the cow

Smith¹,

Fairclough²,

Payne³

et al. 1975

New Zealand Journal of Agricultural Research

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Progesterone and oestradiol concentrations in the peripheral plasma of 12 dairy cows during the oestrous cycle were determined by competitive protein-binding and radioimmunoassay respectively. The levels of progesterone reached a peak of 6-7 ng/ml in mid-cycle, then began to fall 4 days before oestrus to values of about 1 ng/ml at oestrus and remained low for a further 4 days. Peak levels of oestradiol (11.2 ± 1.3 pg/ml, s.e.) occurred on the day before oestrus and a second peak (7.9 ± 2.9 pg/ml) occurred on Days 6-8 of the cycle.

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Section: Discussionsupporting

confidence: 88%

Plasma hormone levels in the cow

Smith¹,

Fairclough²,

Payne³

et al. 1975

New Zealand Journal of Agricultural Research

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“…The overall mean concentration of estrogen in the Punganur cows during estrous cycle on the day of estrus (day 0) and the day 3,6,9,12,15,18,19,20 Glencross and Pope (1981) in exotic cows who recorded lower concentrations of estrogen on different days of estrous cycle compared to the concentration of estrogen in Punganur cattle. These inconsistencies in the concentration of estrogen hormone might be due to the differences in the sampling frequency, seasons and climate at the time of sampling and age and physiological stage (Lactating or not) of the animals (Alvarez et al, 2000).…”

Section: Resultsmentioning

confidence: 92%

Estrogen and Progesterone hormone levels in Punganur Cattle

Naik¹

2013

IOSR-JAVS

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“…The lower progesterone concentration on D5 may be explained by the luteolytic effect of estradiol valerate injected on D0 (WILTBANK et al, 1965). The D9 blood samples, when heifers should be in estrus, should confirm the absence of a functional corpus luteum, and values should be below 1.0 ng/ml (CHRISTENSEN et al, 1974;ADEYEMO;HEALTH, 1980;DÍAZ et al, 1986). Mean progesterone concentration on D9 was 0.13±0.01 ng/ml and samples from all the heifers were below 1.0 ng/ml.…”

Section: Resultsmentioning

confidence: 97%

Progesterone production in superovulated holstein heifers and in crossbred recipient of embryo supplemented with betacarotene and tocopherol

et al. 2011

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Two experiments were conducted to evaluate the effect of the intramuscular injection of betacarotene associated to tocopherol on the plasma concentration progesterone of superovulated Holstein heifers (experiment 1) and in crossbred (Bos taurus x Bos indicus) heifers submitted to fixed-time embryo transfer (FTET, experiment 2). In experiment 1, after estrus synchronization and superovulation animals were inseminated 12 and 24 hours after estrus onset and embryos flushed 7 days later. Heifers were allocated randomly to one of three treatments: Control; T800 (800 mg of betacarotene plus 500 mg of tocopherol) and T1200 (1,200 mg of betacarotene plus 750 mg of tocopherol). The treatments were given on the day of ear implant placement and repeated on the first day of superovulation. Blood samples were collected on D0, D5, D9, D12 and D16. In experiment 2, treatments were imposed at intravaginal device insertion (D0). The same experimental design, as in experiment 1, was used. Blood samples were collected on D17 (embryos implanted) for progesterone determination by radioimmunoassay. In experiment 1, average plasma progesterone concentrations after corpora lutea formation (D12 plus D16 means) were 13.7±1.8 ng/ml, 14.5±2.3 ng/ml and 10.8±2.3 ng/ml for control, T800 and T1200, respectively, and did not differ (P=0.44). In experiment 2, progesterone concentrations on D17 in Control (8.88±0.57 ng/ml), T800 (7.48±0.64 ng/ml) and T1200 (5.90±1.33 ng/ml) groups were similar (P=0.11). Results indicate that the supplemental betacarotene and tocopherol injections did not influence peripheral progesterone concentrations in superovulated Holstein donors and crossbreed recipients heifers.

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Levels of Hormones in the Serum of Cycling Beef Cows

Cited by 35 publications

References 8 publications

Plasma hormone levels in the cow

Plasma hormone levels in the cow

Estrogen and Progesterone hormone levels in Punganur Cattle

Progesterone production in superovulated holstein heifers and in crossbred recipient of embryo supplemented with betacarotene and tocopherol

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