• CuSO4
• CuSO4 + Phytase After 5 weeks the weights between the groups showed significant
differences. As expected, lowest final weight of 19.75 kg was found for the group receiving copper sulfate only. On the other side, highest weight development was observed by using HMTBa-chelated copper (20.5kg) or the combination of chelated copper with phytase (22.4kg). This demonstrates that phytase works more efficiently when the trace mineral is chelated with HMTBa by reducing the interaction between copper and the phytate molecule (Figure 5).
Figure 5: Interaction of copper and phytase on piglet weight development
kg
Mintrex Cu
vs.Mintrex Cu + Phytase p<0.001
Mintrex Cu + Phytase vs. Copper Sulfate + Phytase p=0.002 Mintrex Cu vs Copper Sulfate; p<0.001
phosphorous were identical in the diets, but still reacted (indirectly) when trace minerals such as Zn, Cu and Mn were added as chelated sources. These side or indirect effects can be explained by the higher stability of the Mintrex trace minerals lowering the interactions with phytase and antagonistic effects with other minerals such as phosphorus or calcium. In this context, the indirect effects on higher phosphorous
digestibility by using chelated trace minerals may help to reduce the phosphorous waste in swine production. Reduction of phosphorous excretion by farm animals is increasingly in the spotlight due to environmental concerns. Many efforts have already been made to improve the efficiency of phosphorous uptake by the animal like phase feeding or phytase addition. Based on the promising digestibility data, the usage of Mintrex chelated trace minerals might be a new tool to further optimize phosphorous uptake by the animal. As a result of promising observation on phosphorous digestibility, the study measured phosphorous excretion in the inorganic and the chelated trace mineral group. Results of phosphorous uptake and excretion are shown in Table 2.
Table 2: Phosphorous uptake and excretion in pigs receiving diets containing inorganic trace minerals or HMTBa-Chelated trace minerals
Inorganic Trace Minerals
Effects of Mintrex Zn, Cu & Mn on phosphorous digestibility and excretion Another interesting observation is the link between using a blend of chelated Zn, Cu and Mn and improved calcium and phosphorous uptake by the animal. A recent trial in growing pigs (8 replicates per group, initial body weight 31.1kg) studied the effect on mineral apparent total tract digestibility by using trace mineral levels as Zn (40 mg/kg), Cu (50 mg/kg) and Mn (20 mg/kg) either in the inorganic form or as Methionine-Hydroxy-Analog Chelates (Figure 6). Besides directly improving the digestibility of zinc, copper and manganese, higher phosphorous and calcium absorptions rates have been observed. In Figure 6, the improved digestibility of calcium and phosphorous are indicating an “indirect effect”. Sources of calcium and
Figure 6: Apparent total tract digestibility (%) in pigs fed diets with inorganic or chelated trace minerals
Indirect Effect % Direct Effect Intake of P in mg/d
Fecal Excretion P mg/d Urinary Excretion P mg/d Total P Excretion mg/d
7046a 3565a 89a
3654a
HMTBa-Chelated Trace Minerals
7076a 3093b 125a
3218b Improving the efficiency of phosphorous uptake by the animal
lowered the total phosphorous excretion by 12%. These findings fit very well in the overall results on higher ATTD (Figure 3) and the interaction with phytase (Figure 5). Beside the improvement on performance, HMTBa chelated trace minerals may be an appropriate nutritional strategy to further lower phosphorous excretion by the animal. As an overall conclusion, the results are showing that: • HMTBa chelated trace minerals are higher bioavailable than other sources. • In piglet diets, the replacement of CuSO4 by Mintrex Cu significantly improved health and performance linked to higher availability of copper and improvements on gut health. • Supplementation of HMTBa-chelated trace minerals instead of inorganic sources increases the efficiency of phytase by lowering the formation of insoluble phytate-mineral complexes. • Mintrex chelated trace minerals improve the efficiency of Ca and P uptake in the digestive tract, which allows swine producer to further optimize their diets. • Due to higher regulatory standards on excretion for farm animals, HMTBa-chelated minerals could become a promising nutritional strategy to reduce phosphorous and trace mineral excretion.
FEED COMPOUNDER MARCH/APRIL 2018 PAGE 35
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