The role of endogenous estrogens in the maturation process of the bovine placenta

Grünert, E; Ahlers, D; Heuwieser, W.

doi:10.1016/0093-691x(89)90492-5

Cited by 43 publications

(30 citation statements)

References 18 publications

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“…It was also reported that E 1 S concentrations were much lower in cows whose calves died during parturition and in co ws with retained feta l membrane than in normal cows [14,16]. A high level of estrogen is a prerequisite for the maturation of placenta, leading to the undisturbed expulsion of placenta postpartum [18]. The calf birth weights were not much different between cows with and without retained placenta.…”

mentioning

confidence: 84%

Plasma Concentration of Estrone Sulfate during Pregnancy in Different Breeds of Japanese Beef Cattle

et al. 2003

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Abstract. Plasma concentrations of estrone sulfate in different breeds of Japanese beef cattle and the relationship between those concentrations and feto-placental growth were examined in order to assess the possibility of monitoring abnormal growth of the fetus. Blood samples were obtained from cows from day 90 of gestation to parturition. The plasma concentration of estrone sulfate was measured by direct enzyme immunoassay. From day 180 of gestation, the mean concentration of estrone sulfate increased gradually and it was drastically elevated after day 240 of gestation with the maximum at day 285. Plasma concentrations of estrone sulfate on day 240 of gestation was significantly increased in F1 cows (Holstein Friesian and Japanese Black) compared with those in other breeds of cow. From day 270 to 278 of gestation, estrone sulfate concentrations of Holstein Friesian cows inseminated by Holstein Friesian differed from those inseminated by Japanese Black. In the cow with retained placenta, the plasma concentration of estrone sulfate reached plateau at day 240 of gestation and did not increase thereafter. There was no significant relationship between estrone sulfate concentration and duration of gestation, calf birth weight, weight of placenta or viability of newborn calves. These results indicate that changes of plasma estrone sulfate concentration in Japanese beef cattle are very similar to those in Holstein dairy cattle. They also suggest that the plasma concentration of estrone sulfate is associated with the breed of pregnant cow and that its concentration is also affected by calf birth weight depending on the breed of bull. It seems possible to predict the incidence of retained placenta but not the calf birth weight and viability of newborn calves in Japanese beef cattle.

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confidence: 84%

Plasma Concentration of Estrone Sulfate during Pregnancy in Different Breeds of Japanese Beef Cattle

et al. 2003

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“…This session about HBO therapy is based on Slovis' [114] paper with modifications. "The art of healing comes from nature, not from the physician.…”

Section: Hyperbaric Oxygen In Therapymentioning

confidence: 99%

“…Patients included pregnant animals as well as neonatal foals with no adverse effects noted. Patients have been pressurized from 2 to 3 ATA ranging from 60 to 90 min at treatment pressure (depth Contraindications for HBO therapy are unknown for horses but may include untreated pneumothorax, high fevers (predisposition to oxygen toxicity), emphysema, and upper airway occlusions [114].…”

Section: The Use Of Hbo In Veterinary Medicinementioning

confidence: 99%

“…There are reports describing the differences in PGF2 a and PGE 2 concentrations in placental tissue between released and retained cotyledonary membranes [166,249]. Plasma progesterone is higher and the levels of oestrogen are lower in cows that retain the placenta than in animals that do not [59,114]. The levels of 8-iso-PGF2 a are higher in retained than in nonretained placental tissues [146] and this elevation seems to be due to an increase in lipid peroxidation [145,147].…”

Section: Retained Placentamentioning

confidence: 99%

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Studies on Veterinary Medicine

Mandelker¹,

Vajdovich²

2011

Oxidative Stress in Applied Basic Research and Clinical Practice

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“…Retention of fetal membranes is a multifactorial syndrome, the biochemical background of which is not fully understood. There is evidence that the level of plasma progesterone is higher and the levels of oestrogens are lower in cows which retain the placenta than in animals which do not ( Chew et al 1972; Grunert et al 1989). Disturbances of the lipid metabolism during late pregnancy associated with a high frequency of retained placenta have been described ( Reid et al 1983; Bronicki and Dembiński 1993).…”

Section: Introductionmentioning

confidence: 99%

Antioxidative Defence Mechanisms in Bovine Placenta and their Importance for Placental Release

Kankofer¹

2000

Reprod Domestic Animals

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Contents Reactive oxygen species, although unavoidable intermediates, may have positive and negative effects on tissue and cells. There is some evidence that imbalance between production and neutralization of reactive oxygen species may lead to peroxidative changes of cells, disturbances of the metabolism and in consequence disorders such as, among others, the retention of fetal membranes, udder oedema and mastitis in cows. Defence mechanisms against reactive oxygen species consist of enzymatic and nonenzymatic systems. This review examines the available literature regarding the activity of enzymatic and nonenzymatic defence mechanisms against reactive oxygen species in bovine placenta. Its importance for placenta release in cows is also discussed.

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The role of endogenous estrogens in the maturation process of the bovine placenta

Cited by 43 publications

References 18 publications

Plasma Concentration of Estrone Sulfate during Pregnancy in Different Breeds of Japanese Beef Cattle

Plasma Concentration of Estrone Sulfate during Pregnancy in Different Breeds of Japanese Beef Cattle

Studies on Veterinary Medicine

Antioxidative Defence Mechanisms in Bovine Placenta and their Importance for Placental Release

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