Serum micronutrient concentrations in beef cows before and after the summer grazing season

Weyer, Leanne M. Van De; Hendrick, S.; Waldner, Cheryl L.

doi:10.4141/cjas10036

Cited by 6 publications

(13 citation statements)

References 29 publications

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“…Recent studies have indicated that copper levels are correlated with retinol levels. These results are in accordance with the findings of Van De Weyer et al (2010), who found similar deficient results in beef cows on pastures for this micronutrient.…”

Section: Resultssupporting

confidence: 93%

Retinol and mineral status in grazing foals during the dry season

et al. 2017

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-The objective of this study was to examine serum retinol and some mineral (zinc, iron, calcium, phosphorus, magnesium, and copper) levels in seven Mangalarga Marchador colts aged 329.48 days, reared on pasture in the city of Montes Claros, MG, Brazil, during the dry season. Equines were evaluated for four periods of 45 days during the total study period of five months. The foals had access to Panicum maximum cv. Tanzania pasture, while water and mineral salt lick were provided ad libitum. Blood samples were taken to determine serum retinol and levels of minerals, along with pasture samples to quantify beta-carotene in the grass. The results indicated that retinol levels varied (2.87 to 1.97 µg/dL) and remained below the standard levels. The levels of zinc, iron, calcium, and phosphorus did not vary significantly with average values of 36.79 µg/dL, 77.32 µg/dL, 10.33 mg/dL, and 9.99 mg/dL, respectively. However, zinc and calcium remained below standard concentrations of 60-120 µg/dL and 10.8-13.5 mg/dL, respectively, since the beginning of the study. On the other hand, copper and magnesium levels decreased over time (97.76 to 77.56 mg/dL and 2.86 to 2.21 µg/dL, respectively), but showed normal levels for horses during the research. Beta-carotene in grass showed a downward trend over time from 38.53 to 0.09 mg/kg of dry matter. The results also indicated a significant relationship between serum retinol and serum copper levels. Vitamin A supplementation is necessary whenever foals are fed pastures during the dry season.

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Section: Resultssupporting

confidence: 93%

Retinol and mineral status in grazing foals during the dry season

et al. 2017

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“…; Van De Weyer et al . ). In the present study, we did not determine the intake of a‐Toc and BC from forage, but serum a‐Toc and BC levels in heifers during the grazing period were higher than those in pre‐grazing, suggesting that heifers in both FG and PG consumed higher amounts of a‐Toc and BC compared to the respective pre‐grazing amounts.…”

Section: Discussionmentioning

confidence: 97%

Increase in plasma total antioxidant capacity of grazing Japanese Black heifers and cows in forestland in Japan

Haga

Ishizaki

Nakano

et al. 2013

Animal Science Journal

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Blood total antioxidant capacity (TAC) has become a key bio-marker for animal health. Forest-grazing cattle are known to forage various native plants that have high TAC. This study evaluated differences of plasma TAC between forest-grazing (FG) and pasture-grazing cattle (PG). Experiment 1 monitored the plasma TAC levels of 32 Japanese Black cattle. The level in PG did not change throughout the grazing period. However, that in FG, which increased from summer, was significantly higher than that in PG through fall (P < 0.05). In experiment 2, we used nine Japanese Black heifers and investigated their blood antioxidant parameters and the TAC in plants that the cattle consumed in late June and September. The plasma TAC levels in FG were significantly higher than those in PG in both periods (P < 0.05). Plasma levels of lipid peroxidation in FG tended to be lower than that in PG (P = 0.098). Furthermore, the TAC levels in various species of shrubs and trees consumed by FG were higher than those in pasture grasses. Results of this study show that plasma TAC of grazing Japanese Black cattle in forestland increase from summer through fall.

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“…The amount of vitamin A in cows' colostrum and milk depends on their intake during late gestation. Concentrates are a poor source of vitamin A and β-carotene, and vitamin A concentrations are higher in cattle after summer grazing periods compared with after winter feeding (Puls 1994;Nozière et al 2006;Van de Weyer et al 2010). This is at least in part due to the decrease in vitamin A precursor content and biological activity that occurs due to heat, light, and moisture during harvesting for hay or silage and dehydrating in preparation for storage (McDowell 1989).…”

Section: Discussionmentioning

confidence: 99%

“…Both vitamin A and vitamin E concentrations were lower in calves from heifers than in calves born to cows. Although heifers may have lower volume and quality of colostrum, this relationship is not immediately intuitive, and in fact, a number of studies have demonstrated that the serum vitamin A, vitamin E, and β-carotene concentrations in older cows were lower compared with younger cows (Katsoulos et al 2005;van de Weyer et al 2010). Similarly, calves from heifers had higher liver vitamin A concentrations compared with calves from cows in a study on micronutrient concentrations in beef calves that had died (Waldner and Blakley 2014).…”

mentioning

confidence: 99%

Factors associated with serum vitamin A and E concentrations in beef calves from Alberta and Saskatchewan and the relationship between vitamin concentrations and calf health outcomes

Waldner

Uehlinger

2016

Can. J. Anim. Sci.

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The study objectives were to identify factors associated with serum vitamin A and vitamin E concentrations in beef calves less than 1 mo old and to examine associations between vitamin concentrations and health outcomes. Serum vitamin A concentrations were highest in calves more than 4 d old, with serum immunoglobulin G concentrations > 19 g L −1 , from cows without perinatal health problems, and born where precipitation in the previous growing season was ≥200 mm. Serum vitamin E was highest in calves more than 4 d old, born earlier in the calving season, not born to heifers, and that received selenium and vitamin E injections at or shortly after birth. After accounting for other risk factors, calves with serum vitamin A less than 0.14 μg mL −1 were 2.8 times more likely to die (P = 0.02), and calves with serum vitamin E less than adequate for their age (2-7 d old, <0.8 μg mL −1 ; >7 d old, <0.5 μg mL −1) were 3.2 times more likely to be treated for enteritis than calves with higher concentrations (P = 0.0001). Drought conditions, dam peripartum health problems, and inadequate colostrum intake contribute to low vitamin A and vitamin E concentrations and adverse health outcomes in beef calves.

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Serum micronutrient concentrations in beef cows before and after the summer grazing season

Cited by 6 publications

References 29 publications

Retinol and mineral status in grazing foals during the dry season

Retinol and mineral status in grazing foals during the dry season

Increase in plasma total antioxidant capacity of grazing Japanese Black heifers and cows in forestland in Japan

Factors associated with serum vitamin A and E concentrations in beef calves from Alberta and Saskatchewan and the relationship between vitamin concentrations and calf health outcomes

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