Some Effects of Feeding Young Steers on a Diet Deficient in Both Cobalt and Copper

Macpherson, Allan; Moon, F. E.; Voss, R. C.

doi:10.1016/s0007-1935(17)36382-0

Cited by 20 publications

(5 citation statements)

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“…This range of serum vitamin B12 levels, and the lack of a growth response to supplementation agree with Reid & McQueen (1984) and McPherson (1981). The results are in contrast to McPherson et al (1973) and Winter et al (1977) who, using microbiological assays (Lactobacillus leichmanm), reported growth responses in cattle with serum vitamin B12 levels in and above this range. However the methodologies used may have contributed to these numerical differences.…”

Section: Discussionsupporting

confidence: 88%

“…This finding indicates that the cobalt intake was not sufficient to maintain liver vitamin B12 stores. Previous workers have reported that calves require 6-10 months of low cobalt intake before deficiency signs occur (Gardiner 1977;McPherson et al 1973). Our findings support this and suggest that cattle may need to graze pastures of 0.04-0.06 mg Co/kg DM content (unwashed samples) for longer periods to determine if deficiency signs occur.…”

Section: Discussionsupporting

confidence: 85%

“…This was to be expected, as the amount and frequency of treatment was greater than that previously reported to maintain normal growth rates when cobalt intake was inadequate. McPherson et al (1973) found that 250-500 JLg of vitamin B12 maintained growth rates for 10-12 weeks, whereas Judson et al (1981) considered 2000 JLg of hydroxycobalamin met requirements of calves for 7-9 months.…”

Section: Discussionmentioning

confidence: 99%

“…McPherson et al (1973) considered that the minimum level of cobalt in the diet should be 0.06-0.07 mg/kg DM. During the spring and summer the pasture cobalt level was even lower, averaging 0.042 mg Co/kg DM in washed and 0.058 mg Co/kg DM in unwashed samples.…”

Section: Discussionmentioning

confidence: 99%

“…McPherson et al (1973) reported a weight gain response to vitamin B12 supplementation in penned cattle offered a diet containing 0.040-0.044 mg Co/kg DM. Our study indicates that mean pasture cobalt levels of l®ss than 0.06 mg/kg but greater than 0.04 mg/kg may not reduce growth rate.…”

Section: Discussionmentioning

confidence: 99%

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Absence of a weight gain response to vitamin B₁₂supplementation in weaned beef cattle grazing pastures of marginal cobalt content

Clark

Ellison

Kirk

et al. 1986

New Zealand Journal of Agricultural Research

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Forty female Angus crossbred calves aged 8 months were allocated to 2 groups based on liver vitamin BIZ levels and bodyweight. The treatment group was given monthly subcutaneous injections of 2000 J-tg hydroxycobalamin. From each group, . 5 animals were liver biopsied and 10 animals: serum and urine sampled at monthly intervals for 10 months. Pasture cobalt content in washed and unwashed samples averaged 0.051 mg/kg (0.866 J-tmollkg) and 0.061 mg/kg (1.04 J-tmollkg) DM respectively over the trial period. Mean liver vitamin B12 levels of the untreated group dropped during the spring and summer to 400 nmollkg, while the treated group remained above 640 nmollkg. Serum vitamin BIZ levels of the untreated group during the spring and summer averaged 87 pmolilitre, with the lowest mean monthly level of 73 pmolilitre occurring in November. Mean urinary methyl malonic acid remained low (less than 36 J-tmolilitre) in both groups. There was no weight gain response to vitamin BIZ treatment.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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