responsible trace mineral management
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Responsible management of trace minerals for dairy cattle

Important to know...

Figure 1: Impact of vitamins and trace minerals for cattle on organ systems and essential functions in dairy cows.

Optimising dairy performance while minimising environmental impact

Dairy cows require at least 15 different minerals and vitamins to avoid mineral deficiencies in cattle and to maintain good health and productivity (see Figure 1). The mineral and vitamin requirements of dairy cattle depend on various factors, including genetic potential, production levels, milk yield, pregnancy status, lactation stage, and the composition of the diet.

Deficiencies of trace minerals for cattle can have a serious impact lactational performance, health, and reproduction of dairy cows. Oversupplying dairy cows with trace minerals on the other hand, can lead to:

  • Increased feed costs
  • Trace mineral toxicity in cattle
  • Increased reactivity towards vitamins in premixes, supplements and in a TMR
  • Antagonist effects with other minerals
  • Decreased dairy performance
  • Trace mineral ions being excreted into the environment, leading to trace mineral soil contamination
The goal of responsible trace mineral management is optimal mineral supply, avoiding trace mineral deficiencies in cattle, but also avoiding trace mineral toxicity in cattle through excessive mineral supplementation and avoiding higher costs without a return on investment.

Selko® | sharing latest scientific insights

Hydroxy trace minerals improve milk production, health & fertility

Several scientific trials have proven the effects of Selko Intellibond. Prof. Dr. Santos at the University of Florida has again shown great results of our Hydroxy Trace Mineral mixture for cows. Watch the videos from the latest webinar and discover how Hydroxy Trace Minerals like Selko Intellibond can increase colostrum production with 1.5 kg (3.3 lbs) per cow per day and 1.4 kg ECM (3 lbs) per cow per day throughout the first 105 lactation days.

Figure 2: Hepatic copper concentration and fertility parameters in replacement heifers fed copper levels slightly above the NASEM guidelines (16 ppm) compared to replacement heifers fed elevated (32 ppm) dietary copper concentrations.

Responsible trace mineral management of dairy cattle

Over-supplementation of trace minerals is a common issue in dairy herds
Studies on commercial dairy farms in Canada1 and the US2 showed that mineral supplementation in commercial dairies frequently exceeds the NASEM guidelines3 (see Table 1).

Trace elements NASEM 2021 100 eastern Canada Dairies 39 Californian Dairies
PPM 32 kg/d Milk Yield Dairy Cow Average ± SD 10% Lowest 10% Highest Median 10% Lowest 10% Highest
Copper 10 17 ± 5 10 34 18 10 31
Manganese 37 1765 ± 18 27 123 73 48 106
Zinc 66 76 ± 21 33 144 74 51 103
Table 1: Trace mineral levels fed in 139 dairies compared to NASEM 2021 guidelines for dairy cattle.
Over-supplementation of copper results in accumulation in the liver of dairy cattle
Studies carried out in the UK4, US5 and the Netherlands6 show that feeding copper above the NASEM guidelines for dairy cattle resulted in elevated liver copper concentrations, leading to a significant risk of chronic copper toxicity in dairy cattle. These studies confirm that over-feeding trace minerals is a global issue, with significant risks of trace mineral toxicity in cattle and trace mineral copper soil contamination.

Over-supplementation of copper has a negative effect on performance and fertility
A longitudinal study conducted in the UK7 showed that feeding heifers a diet with copper levels above the NASEM 2021 guidelines resulted in poor fertility (see Figure 2).

Over-supplementation of trace minerals increases the risk of environmental contamination
A recent study conducted in Canada8showed that feeding cobalt, manganese and zinc above the NASEM 2021 requirements for dairy cattle significantly raised the output of trace minerals in both faeces and urine.

Calculating the optimal level of trace mineral supplementation in dairy cows

Dairy herds should receive the correct amount of trace minerals to prevent deficiencies without causing over-supplementation. A process in 3 steps can assure that dairy cows will be fed according to the NASEM guidelines.

Step 1: Understand the NASEM 2021 guidelines for dairy cattle
The NASEM guidelines for dairy cattle serve as benchmark for formulating diets that meet the specific needs of lactating and non-lactating dairy cows. The NASEM guidelines are based on total diet.

Step 2: determine how much trace mineral is already present in the basal ration of dairy cattle
The basal ration of dairy cows is defined as the combination of all forages and by-products, without compound feed and supplements. Neglecting the trace minerals naturally present in forages and by-products can result in over-supplementation.

Values from a model13 based on 5,000 dairy diets were used for modelling the risk for inadequate trace mineral intake. The Trouw Nutrition R&D team calculated the distribution of copper (Cu), zinc (Zn) and manganese (Mn) levels in those 5,000 diets (see Table 2).

Copper (Cu) Zinc (Zn) Manganese (Mn)
Percentile Level Percentile Level Percentile Level
Highest 36 Highest 148 Highest 204
99% 18 99% 66 99% 100
90% 12 90% 49 90% 64
50% 9 50% 37 50% 46
10% 7 10% 28 10% 34
1% 5 1% 21 1% 25
Lowest 4 Lowest 15 Lowest 18
Table 2. Trace mineral levels (ppm) for Cu, Zn and Mn in different dairy diets: distribution across percentiles.
The 1% percentile from Table 2 is being used to calculate the minimum level of trace mineral that needs to be supplemented to minimise the risk of underfeeding.

The 99% percentile from Table 2 is being used to compare the maximum level of trace mineral that is supplemented to the tolerance level according to the NASEM guidelines, thus reducing the risk of overfeeding.
Trace mineral for dairy Supplementation required
Copper 5-7 ppm
Zinc 45-61 ppm
Manganese 12-150 ppm
Trace mineral for dairy Supplementation required
Copper 5-7 ppm
Zinc 45-61 ppm
Manganese 12-150 ppm

Table 3: Recommended supplementation levels for copper, zinc and manganese for lactating dairy cows. Following these recommendations for supplementation levels, dairy cows are fed according to the NASEM guidelines, resulting in a minimal risk for mineral deficiencies in cattle.

Example: calculating the correct dose of copper to be supplemented

The NASEM recommendation for Cu level for the total diet is 10 ppm. The 1% percentile for Cu in Table 2 is 5 ppm. This means that if the value of 5 ppm is being used for the calculation, there is a 99% chance that the actual diet fed on the farm has a higher level of Cu, reducing the risk of underfeeding to 1% or less. Thus, the recommended supplementation level is 10ppm – 5ppm = 5 ppm of Cu.

The upper tolerance level for Cu in the NASEM 2021 guidelines is 25 ppm. The 99% percentile for Cu in the basal diet is 18 ppm. This means there is a safety margin of 25 ppm – 18 ppm = 7 ppm. Thus, supplementation of Cu should not exceed 7 ppm.

Thus, supplementing 5-7 ppm Cu is sufficient to meet the cow's needs while avoiding overfeeding. Similar calculations were made for zinc and manganese (see Table 3).

Trace Mineral Total Requirement (ppm) Contribution from Basal Diet (ppm) Shortfall (ppm) Amount of TM coming from Selko IntelliBond (mg/day) Amount of Selko IntelliBond required (mg/cow/day)
Cu 10 5 10 - 5 = 5 22.5 × 5 = 113 113 / 0.54 = 208
Zn 66 21 66 - 21 = 45 22.5 × 45 = 1,013 1,013 / 0.55 = 1,841
Mn 37 25 37 - 25 = 12 22.5 × 12 = 270 270 / 0.44 = 614
Trace Mineral Total Requirement (ppm) Contribution from Basal Diet (ppm) Shortfall (ppm) Amount of TM coming from Selko IntelliBond (mg/day) Amount of Selko IntelliBond required (mg/cow/day)
Cu 10 5 10 - 5 = 5 22.5 × 5 = 113 113 / 0.54 = 208
Zn 66 21 66 - 21 = 45 22.5 × 45 = 1,013 1,013 / 0.55 = 1,841
Mn 37 25 37 - 25 = 12 22.5 × 12 = 270 270 / 0.44 = 614

Table 4: Trace mineral supplementation using Selko IntelliBond in cattle mineral supplements. This table details the shortfall in trace mineral supply from the basal diet, the amount supplemented using Selko IntelliBond, and the resulting inclusion rates.

Step 3: Meeting the shortfall with Selko IntelliBond hydroxy trace minerals for dairy cattle

The final step is to calculate the total amount of Selko IntelliBond hydroxy trace minerals that needs to be included in a diet of a cow consuming 22.5 kg of DM to meet the total recommended levels from the NASEM 2021 guidelines. Table 4 shows the calculation of the shortfall, and the Selko IntelliBond inclusion rates required for supplementation in addition to the basal diet.

After supplementation with Selko IntelliBond hydroxy trace minerals for cattle, the final diet precisely meets the NASEM 2021 recommendations for trace minerals for cattle, ensuring both nutritional adequacy and environmental stewardship.

Figure 3. Relative bioavailability of Selko IntelliBond hydroxy trace minerals for cattle compared to sulphates and organic trace mineral sources for cattle.

Higher bioavailability of Selko IntelliBond trace mineral sources reduces the risk of underfeeding

The NASEM guidelines are based on inorganic trace mineral sources. Comparative studies11,12,17,20 in cattle have consistently shown the superior bioavailability of Selko IntelliBond hydroxy trace mineral sources over sulphate-based minerals sources (see Figure 3). Mineral absorption in dairy cattle is a regulated process, bioavailability varies not only between mineral sources, but also according to the dietary concentration of trace mineral provided. If trace minerals are fed below requirements, absorption is high, if fed well above requirements, absorption is low. This means that if supplementation levels are being reduced, absorption is likely to be upregulated, reducing the risk of underfeeding.

Figure 4: Effect of feeding Selko IntelliBond hydroxy trace minerals compared to sulfate trace mineral sources on production of colostrum and Energy Corrected Milk of dairy cattle.

The additional benefits of Selko IntelliBond hydroxy trace minerals for dairy cattle

Reducing the level of supplemented trace minerals fed will reduce the amount of free metal ions in the rumen, which has a positive impact on rumen function, leading to several significant positive effects in dairy cows. Selko IntelliBond hydroxy trace minerals are largely insoluble at rumen pH, they release their trace mineral ions gradually in the duodenum once the pH drops to 4.0. Switching to Selko IntelliBond hydroxy trace minerals leads to a further improvement of rumen function in dairy cattle, which enhances the effects of a responsible mineral approach further.

Enhanced lactational performance of dairy cows
Reducing the amount of trace minerals in a dairy ration reduces the amount of free metal ions in the rumen, which leads to an improvement of rumen function of dairy cows. Switching to Selko IntelliBond hydroxy trace mineral supplements for dairy cattle results in an additional improvement of rumen function. Studies have shown that feeding Selko IntelliBond to dairy cattle improves NDF and DM digestibility14,15,16,17,18,19,20,21,22, improves rumen function31,32,33,34, and supports cow health23. These improvements contribute to better colostrum quality26, boost fertility24,25 and improve lactational performance22,26,27, with an increase in energy-corrected milk (ECM) yield of 1.4 kg/cow/day (see Figure 4).

Reduced risk of contamination of the environment with metal ions
Reducing the amount of trace minerals in a dairy ration reduces the risk of excretion of trace minerals into the environment. Trials10 have shown that the use of Selko IntelliBond hydroxy trace minerals reduces excretion of trace metal ions into the environment even further.

Reduced carbon footprint per kg of ECM produced
Selko IntelliBond for dairy cattle was the first improved source of trace mineral nutrition with a Life Cycle Assessment (LCA) that demonstrated a reduction in carbon intensity of milk production, decreasing CO₂ equivalents per kilogram of ECM by 1.5–2.0 %28,29.

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During another recent podcast, Professor Santos and Professor Barry Bradford from Michigan State University discussed the financial implications and the potential return on investment of switching a dairy herd from sulfates to Selko IntelliBond Hydroxy Trace Minerals.

Optimized return on investment (ROI)

The increase in ECM production translates into a strong economic benefit. Depending on milk prices and feed costs, the ROI for feeding Selko IntelliBond can range from 12:1 to 15:1, based on the improvement of lactational performance only. If other benefits (improvement of health and fertility, reduced culling rate and reduction of CO₂ equivalents per kilogram of ECM) are considered, this ROI is even higher.

Reach out to your local Selko nutritionist for free expert advice

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