Effect of Energy Level and Nitrate on Hepatic Vitamin A and Performance of Fattening Steers.

Hale, W. H.; Hubbert, Farris; Taylor, R. E.

doi:10.3181/00379727-109-27181

Cited by 13 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Nervous symptoms were not Sell and Roberts (1963) reported that 0.4% dietary nitrite inhibited growth of chicks by apparently reducing feed consumption. Hale et al (1962) reported similar findings when cattle were fed a ration containing nitrate.…”

mentioning

confidence: 54%

Methemoglobinemia and Reduced Feed Consumption Due to Feeding Nitrite to Chicks

1963

View full text Add to dashboard Cite

mentioning

confidence: 54%

Methemoglobinemia and Reduced Feed Consumption Due to Feeding Nitrite to Chicks

1963

View full text Add to dashboard Cite

“…Nitrat ve nitrit, gevişenlerde, bir yandan karotinoidlerin Yit A ya çevrilmesini inhibe A. ALTINTAŞ eder ve karaciğerde depolanmayı önler, diğer yandan karaciğer depolarını hızla mobilize ederek Yit A'yı tüketir (3,18,22).…”

Section: Sekonder Yetersizlikunclassified

Buzağilarda Bakarkörlük Ve Vi̇tami̇n a Yetersi̇zli̇ği̇

Altintaş¹

1995

Ankara Üniversitesi Veteriner Fakültesi Dergisi

View full text Add to dashboard Cite

“…A toxic level will lead to animal deaths within a matter of days: nitrate is reduced by rumen bacteria to nitrite which combines with blood haemoglobin to form methaemoglobin; the oxygen-carrying capacity of the blood is thereby reduced. Nitrate below toxic levels inhibits the conversion of carotene to vitamin A in ruminants (9,12,26,27).Johnson and Baumann (17) showed that a normal thyroid gland was essential for the conversion of carotene to vitamin A. Since nitrate reduces thyroid activity (34, 35), this suggests 228 that the effect of nitrate, mediated through the thyroid gland, may contribute to the lower in vivo carotene conversion.…”

mentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Performance and Vitamin a Status of Sheep Grazing High‐nitrate Pastures

O'Donovan¹,

Conway²

1968

Grass and Forage Science

View full text Add to dashboard Cite

Nitrogen levels of 0, 184 and 368 lb (0, 83-47 and 166-94 kg) were applied, as calcium ammonium nitrate, in six dressings throughout the grazing season to a perennial ryegrass/white clover sward. Herbage samples taken, periodically from each treatment and analysed nitrate for, indicated that the latter increased with increasing levels of applied nitrogen. Herbage nitrate levels weie higher towards the end of the grazing season than at any other time. There was no consistent relationship between applied nitrogen and total plant nitrogen, although the latter tended to run parallel with applied-nitrogen levels during the early part of the year. Sheep performance was significantly increased with the first increment of 184 lb (83-47 kg) of nitrogen; a second increment of 1841b resulted in a further, but non-significant, increase. High-nitrate pastures did not significantly reduce livei vitamin A storage in sheep. It is suggested that approximately 350 Ib (158-79 kg) of nitrogen, applied uniformly throughout the grazing season, results in pasture nitrate levels which have no adverse affect on sheep performance. INTRODUCTION As livestock intensification progresses the need for larger nitrogen applications to grassland will become more apparent. Nitrogen applied as ammonium salts is first oxidized to nitrate by soil bacteria and as such can be absorbed by plant roots. The rate at which absorbed nitrate is formed into protein is related to plant growth rate. With high nitrogen application, plants can absorb more nitrate than they can readily form into protein.Accumulation of nitrate in plants can have two different effects. A toxic level will lead to animal deaths within a matter of days: nitrate is reduced by rumen bacteria to nitrite which combines with blood haemoglobin to form methaemoglobin; the oxygen-carrying capacity of the blood is thereby reduced. Nitrate below toxic levels inhibits the conversion of carotene to vitamin A in ruminants (9,12,26,27).Johnson and Baumann (17) showed that a normal thyroid gland was essential for the conversion of carotene to vitamin A. Since nitrate reduces thyroid activity (34, 35), this suggests 228 that the effect of nitrate, mediated through the thyroid gland, may contribute to the lower in vivo carotene conversion. Sell and Roberts (25) confirmed this finding with chicks.The addition of nitrate reduced liver vitamin A in both sheep and rats (13, 21) and other workers (16, 20, 26) have reported that highnitrate diets interfere with carotene and vitamin A metabolism. The feeding of nitrite, but not nitrate, significantly lowers liver vitamin A storage from the orally-administered preformed vitamin (7). Liver vitamin A storage from carotene is reduced by both nitrate and nitrite, with the greatest effect from the latter.Bacterial reduction of nitrates in silages produces oxides of nitrogen which, in addition to the human health hazard, affect the biological activity of carotene. Gaseous oxides of nitrogen (NO and N2O4) destroy carotene, which as a result has no vitamin A activit...

show abstract

Effect of Energy Level and Nitrate on Hepatic Vitamin A and Performance of Fattening Steers.

Cited by 13 publications

References 0 publications

Methemoglobinemia and Reduced Feed Consumption Due to Feeding Nitrite to Chicks

Methemoglobinemia and Reduced Feed Consumption Due to Feeding Nitrite to Chicks

Buzağilarda Bakarkörlük Ve Vi̇tami̇n a Yetersi̇zli̇ği̇

Performance and Vitamin a Status of Sheep Grazing High‐nitrate Pastures

Contact Info

Product

Resources

About