Molybdenum poisoning in feedlot cattle

Da, Swan; Jh, Creeper; Cl, White; Ridings, M.; Smith, Gillian; Nd, Costa

doi:10.1111/j.1751-0813.1998.tb12365.x

“…The study demonstrated that grazing cows were susceptible to some degree of molybdenosis (Majak et al 2004). Clinical signs of molybdenosis are much varied (Ward 1978;Swan et al 1998), but clinical evaluations at Highmont only revealed signs of lameness, manifested as a stiff shuffling gait, diarrhea, and hair-coat depigmentation (Majak et al 2004). It should be noted that lameness and diarrhea were resolved in all animals by the end of each grazing season without treatment and hair coats returned to normal by the following spring.…”

Section: Introductionmentioning

confidence: 82%

Efficacy of Copper Supplementation in the Prevention of Molybdenosis in Cattle

Majak

¹

,

Steinke

²

,

Lysyk

³

et al. 2006

Rangeland Ecology & Management

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Revegetation and sustainable cattle grazing are major objectives in the reclamation of mine tailings at the Highland Valley Copper mine in British Columbia, Canada. A total of 150 cows with their calves grazed forage extremely high in molybdenum (Mo) for 5-6 weeks in the summer and fall for 3 consecutive years (2002-2004). The average stocking rate was 0.89 ha per animal unit month. The animals' diet consisted primarily of alfalfa (Medicago sativa L.) and orchardgrass (Dactylis glomerata L.) containing 100-400 ppm Mo. Each year, the herd was divided into 2 groups of approximately 25 cow-calf pairs. One group was supplemented with 2.5% copper sulphate (CuSO 4 5H 2 O) in loose salt, and the other group was only given loose salt. Clinical signs of Mo toxicity, including lameness, diarrhea, and a faded hair coat, were significantly reduced in the supplement cows compared to control cows, which demonstrated the efficacy of the copper supplement treatment. Cattle also developed a tolerance to grazing high-Mo forage, as lameness and diarrhea were reduced in cows that had previous exposure to the site. However, lameness, the primary sign, and diarrhea were resolved in all cows by the end of each trial without treatment and hair coats returned to normal by the following spring. Only 4 calves showed signs of lameness or diarrhea in the 3-year study. Cattle grazing is a viable option for the end land use plan for Highland Valley Copper, provided a CuSO 4 5H 2 O supplement is available to counteract the toxic effects of the high-Mo forage. As well, animals with previous exposure to the site should be utilized, as they appear to develop a tolerance to the Mo in the forage. Resumen La revegetació n y el apacentamiento sostenible de ganado son los principales objetivos en la restauració n de las pilas de colas de la mina Highland Valley Copper en British Columbia, Canadá. Un total de 150 vacas con sus becerros apacentaron forraje con contenidos extremadamente altos de molibdeno (Mo) durante cinco o seis semanas en el verano y otoñ o por tres añ os consecutivos (2002-2004). La carga animal promedio fue de 0.89 ha por unidad animal mes. La dieta de los animales consistió principalmente de ''Alfalfa'' (Medicago sativa L.) y ''Orchardgrass'' (Dactylis glomerata L.) conteniendo 100-400 ppm de Mo. Cada añ o, el hato se dividió en dos grupos de aproximadamente 25 pares de vaca-becerro, uno de los grupos fue suplementado con 2.5% de sulfato de cobre (CuSO 4 5H 2 O) mezclado con sal suelta mientras que al otro se le suministro solo sal suelta (control). Los signos clínicos de intoxicació n por Mo, incluyendo la incapacidad para caminar por cojera, diarrea y decoloració n del pelo, fueron reducidos significativamente en las vacas suplementadas en comparació n con las vacas del grupo control, lo cual demostró la eficacia del cobre como tratamiento suplementario. El ganado también desarrolló una tolerancia a apacentar forraje con alto contenido de Mo ya que la cojera y la diarrea se redujeron en vacas que previamente habían sido expuestas ...

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“…The study demonstrated that grazing cows were susceptible to some degree of molybdenosis (Majak et al 2004). Clinical signs of molybdenosis are much varied (Ward 1978;Swan et al 1998), but clinical evaluations at Highmont only revealed signs of lameness, manifested as a stiff shuffling gait, diarrhea, and hair-coat depigmentation (Majak et al 2004). It should be noted that lameness and diarrhea were resolved in all animals by the end of each grazing season without treatment and hair coats returned to normal by the following spring.…”

Section: Introductionmentioning

confidence: 82%

Efficacy of Copper Supplementation in the Prevention of Molybdenosis in Cattle

Majak¹,

Steinke²,

Lysyk³

2006

REM

0

View full text Add to dashboard Cite

Revegetation and sustainable cattle grazing are major objectives in the reclamation of mine tailings at the Highland Valley Copper mine in British Columbia, Canada. A total of 150 cows with their calves grazed forage extremely high in molybdenum (Mo) for 5-6 weeks in the summer and fall for 3 consecutive years (2002-2004). The average stocking rate was 0.89 ha per animal unit month. The animals' diet consisted primarily of alfalfa (Medicago sativa L.) and orchardgrass (Dactylis glomerata L.) containing 100-400 ppm Mo. Each year, the herd was divided into 2 groups of approximately 25 cow-calf pairs. One group was supplemented with 2.5% copper sulphate (CuSO 4 5H 2 O) in loose salt, and the other group was only given loose salt. Clinical signs of Mo toxicity, including lameness, diarrhea, and a faded hair coat, were significantly reduced in the supplement cows compared to control cows, which demonstrated the efficacy of the copper supplement treatment. Cattle also developed a tolerance to grazing high-Mo forage, as lameness and diarrhea were reduced in cows that had previous exposure to the site. However, lameness, the primary sign, and diarrhea were resolved in all cows by the end of each trial without treatment and hair coats returned to normal by the following spring. Only 4 calves showed signs of lameness or diarrhea in the 3-year study. Cattle grazing is a viable option for the end land use plan for Highland Valley Copper, provided a CuSO 4 5H 2 O supplement is available to counteract the toxic effects of the high-Mo forage. As well, animals with previous exposure to the site should be utilized, as they appear to develop a tolerance to the Mo in the forage. Resumen La revegetació n y el apacentamiento sostenible de ganado son los principales objetivos en la restauració n de las pilas de colas de la mina Highland Valley Copper en British Columbia, Canadá. Un total de 150 vacas con sus becerros apacentaron forraje con contenidos extremadamente altos de molibdeno (Mo) durante cinco o seis semanas en el verano y otoñ o por tres añ os consecutivos (2002-2004). La carga animal promedio fue de 0.89 ha por unidad animal mes. La dieta de los animales consistió principalmente de ''Alfalfa'' (Medicago sativa L.) y ''Orchardgrass'' (Dactylis glomerata L.) conteniendo 100-400 ppm de Mo. Cada añ o, el hato se dividió en dos grupos de aproximadamente 25 pares de vaca-becerro, uno de los grupos fue suplementado con 2.5% de sulfato de cobre (CuSO 4 5H 2 O) mezclado con sal suelta mientras que al otro se le suministro solo sal suelta (control). Los signos clínicos de intoxicació n por Mo, incluyendo la incapacidad para caminar por cojera, diarrea y decoloració n del pelo, fueron reducidos significativamente en las vacas suplementadas en comparació n con las vacas del grupo control, lo cual demostró la eficacia del cobre como tratamiento suplementario. El ganado también desarrolló una tolerancia a apacentar forraje con alto contenido de Mo ya que la cojera y la diarrea se redujeron en vacas que previamente habían sido expuestas ...

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“…Acutely poisoned cattle and sheep developed feed withdrawal, lethargy, weakness, hind limb ataxia that progressed to the front limbs and recumbency (Swan et al, 1998). Acutely poisoned cattle and sheep developed feed withdrawal, lethargy, weakness, hind limb ataxia that progressed to the front limbs and recumbency (Swan et al, 1998).…”

Section: Toxicitymentioning

confidence: 99%

“…However, permanent damage may be present that results in sustained animal deaths for weeks to months post-exposure (Swan et al, 1998). Administration of sulfates to ruminants would not be recommended, as ruminal reduction to sulfide could potentially result in greater thiomolybdate concentrations and worsen the clinical disease.…”

Section: Treatmentmentioning

confidence: 99%