Specific effects on blood plasma from beef cows fed pine needles during late pregnancy on increasing tone of caruncular arteries in vitro
Article Abstract:
A study conducted on eight multiparous beef cows showed that Ponderosa pine needles given during late pregnancy results in the premature delivery of viable calves. Caruncular beds of bovine placentome were tested with control and diluted plasma pooled from cows fed with pine needles. There was an increase in pressure with decreasing dilutions from cows fed with pine needles but no effect was seen in the control group. This indicates that pine needles increase vascular tone of caruncular arteries resulting in premature parturition.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Effects of ingestion of Ponderosa pine needles by late-pregnant cows on uterine blood flow and steroid secretion
Article Abstract:
Cows fed with pine needles were monitored for changes in uterine blood flow and steroid secretion of the gravid uterus. An electromagnetic blood-flow probe was placed around the uterine artery. Uterine blood flow in the control group remained constant while that of cows fed with pine needles decreased progressively. There was also a decrease of estrogen concentration in cows belonging to the test group. The decrease in uterine blood flow is responsible for physiological changes which lead to early parturition.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Effects of ponderosa pine needle ingestion on uterine vascular function in late-gestation beef cows
Article Abstract:
The adverse effects of ponderosa pine needle ingestion on uterine vascular function in beef cattle were studied. Although the causative toxin is still unknown, it is theorized that a circulating causative agent decreases blood flow to the gravid uterus and fetus by increasing the tonus of caruncular arterial beds. This effect seems to be specific for the calcium-dependent mechanism for vasomotor tone.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
User Contributions:
Comment about this article or add new information about this topic:
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