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Trace element supplementation of livestock in new zealand: meeting the challenges of free-range grazing systems.

Grace ND, Knowles SO - Vet Med Int (2012)

Bottom Line: On farms where grazing animals are infrequently yarded, there are limited opportunities to administer trace element supplements via feeds and concentrates.In New Zealand, where the majority of sheep, cattle, and deer graze pasture year round, inadequate intake of cobalt, copper, iodine and selenium is prevalent.Supplementation methods suited to grazing livestock include long-acting injections, slow-release intraruminal boluses, trace element-amended fertilisers, and reticulated water supplies on dairy farms.

View Article: PubMed Central - PubMed

Affiliation: 26 Williams Road, RD 4, Palmerston North 4474, New Zealand.

ABSTRACT
Managing the mineral nutrition of free-range grazing livestock can be challenging. On farms where grazing animals are infrequently yarded, there are limited opportunities to administer trace element supplements via feeds and concentrates. In New Zealand, where the majority of sheep, cattle, and deer graze pasture year round, inadequate intake of cobalt, copper, iodine and selenium is prevalent. Scientists and farmers have developed efficient strategies to monitor and treat these dietary deficiencies. Supplementation methods suited to grazing livestock include long-acting injections, slow-release intraruminal boluses, trace element-amended fertilisers, and reticulated water supplies on dairy farms.

No MeSH data available.


Related in: MedlinePlus

Effect of no treatment (◯) or subcutaneous injection of 60 mg Se as barium selenate (about 1 mg Se/kg LW) (●) administered to ewes 4 weeks prior to mating on blood Se concentrations of ewes (◯, ●) and their lambs (∆, ▲) from birth to weaning. Adequate Se status is indicated by blood Se >250 nmol/L [12].
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getmorefigures.php?uid=PMC3539419&req=5

fig5: Effect of no treatment (◯) or subcutaneous injection of 60 mg Se as barium selenate (about 1 mg Se/kg LW) (●) administered to ewes 4 weeks prior to mating on blood Se concentrations of ewes (◯, ●) and their lambs (∆, ▲) from birth to weaning. Adequate Se status is indicated by blood Se >250 nmol/L [12].

Mentions: Selenium deficiency is common among sheep and cattle on the central North Island and east coast of the South Island of New Zealand. This has spurred the use of a range of options for prevention and treatment. Injectable products containing insoluble barium selenate create a depot in the tissue that provides long-term supplementation. A dose rate of 0.5–1.0 mg Se/kg LW suits most ruminant species and will increase and maintain selenium status for 10–18 months [24]. Selenium crosses the placenta, so it is convenient to administer a single injection to ewes 4 weeks prior to mating in order to address fertility issues, and to increase ewe Se status and that of her lamb until weaning or slaughter at 16–20 weeks of age (Figure 5) [12]. Alternatively, lambs at risk of Se deficiency affecting their growth can be supplemented directly at 3–5 weeks of age at the time of docking. Cows are usually treated prior to mating or early during gestation; their response in terms of blood Se concentration is similar to ewes [25]. Young cattle are supplemented after weaning (5-6 months of age) so that a single injection will suffice until slaughter at 18–20 months of age.


Trace element supplementation of livestock in new zealand: meeting the challenges of free-range grazing systems.

Grace ND, Knowles SO - Vet Med Int (2012)

Effect of no treatment (◯) or subcutaneous injection of 60 mg Se as barium selenate (about 1 mg Se/kg LW) (●) administered to ewes 4 weeks prior to mating on blood Se concentrations of ewes (◯, ●) and their lambs (∆, ▲) from birth to weaning. Adequate Se status is indicated by blood Se >250 nmol/L [12].
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3539419&req=5

fig5: Effect of no treatment (◯) or subcutaneous injection of 60 mg Se as barium selenate (about 1 mg Se/kg LW) (●) administered to ewes 4 weeks prior to mating on blood Se concentrations of ewes (◯, ●) and their lambs (∆, ▲) from birth to weaning. Adequate Se status is indicated by blood Se >250 nmol/L [12].
Mentions: Selenium deficiency is common among sheep and cattle on the central North Island and east coast of the South Island of New Zealand. This has spurred the use of a range of options for prevention and treatment. Injectable products containing insoluble barium selenate create a depot in the tissue that provides long-term supplementation. A dose rate of 0.5–1.0 mg Se/kg LW suits most ruminant species and will increase and maintain selenium status for 10–18 months [24]. Selenium crosses the placenta, so it is convenient to administer a single injection to ewes 4 weeks prior to mating in order to address fertility issues, and to increase ewe Se status and that of her lamb until weaning or slaughter at 16–20 weeks of age (Figure 5) [12]. Alternatively, lambs at risk of Se deficiency affecting their growth can be supplemented directly at 3–5 weeks of age at the time of docking. Cows are usually treated prior to mating or early during gestation; their response in terms of blood Se concentration is similar to ewes [25]. Young cattle are supplemented after weaning (5-6 months of age) so that a single injection will suffice until slaughter at 18–20 months of age.

Bottom Line: On farms where grazing animals are infrequently yarded, there are limited opportunities to administer trace element supplements via feeds and concentrates.In New Zealand, where the majority of sheep, cattle, and deer graze pasture year round, inadequate intake of cobalt, copper, iodine and selenium is prevalent.Supplementation methods suited to grazing livestock include long-acting injections, slow-release intraruminal boluses, trace element-amended fertilisers, and reticulated water supplies on dairy farms.

View Article: PubMed Central - PubMed

Affiliation: 26 Williams Road, RD 4, Palmerston North 4474, New Zealand.

ABSTRACT
Managing the mineral nutrition of free-range grazing livestock can be challenging. On farms where grazing animals are infrequently yarded, there are limited opportunities to administer trace element supplements via feeds and concentrates. In New Zealand, where the majority of sheep, cattle, and deer graze pasture year round, inadequate intake of cobalt, copper, iodine and selenium is prevalent. Scientists and farmers have developed efficient strategies to monitor and treat these dietary deficiencies. Supplementation methods suited to grazing livestock include long-acting injections, slow-release intraruminal boluses, trace element-amended fertilisers, and reticulated water supplies on dairy farms.

No MeSH data available.


Related in: MedlinePlus