The Big Dutchman EggTrax egg transfer drive was designed to achieve gentle egg movement from the collecting belt to the elevator or conveyor. The drive reduces shell damage at the critical point of transfer with soft pressure applied by the fingers and supplemented by wires with adjustable tension. The EggTrax unit operates at a standard conveying speed of 13.1 feet per minute and is available in three drive widths, ranging from 9.7 inches to 19.7 inches. The unit is capable of transferring eggs onto either a rod conveyor or a vertical elevator. During operation, the tension of the pressure and drive rollers can be adjusted using access doors.
The EggTrax drive unit incorporates a cleaning brush for the belt to remove dirt and feathers at the point of transfer. The unit can be removed from the line simply by lifting from the installed position and can be cleaned using water at normal pressure.
The EggTrax Ultra model is designed for extended row lengths up to 700 feet. The EggTrax Ultra incorporates additional bracing for the frame, consistent with conveying speeds of up to 24.6 feet per minute. All the features of the EggTrax model are incorporated into EggTrax Ultra, including identical drive and pressure rollers to simplify maintenance. The system operates with a duplex chain drive.
Field trials are in progress in the U.S. to determine the benefit of the EggTrax unit in reducing shell damage at the point of transfer. Currently, customers selecting from among the range of Big Dutchman NATURA® aviary systems specify EggTrax for their systems.
EggTrax and EggTrax Ultra offer potential benefits for existing installations as a retrofit. For the purpose of calculation, a capital cost installed for the EggTrax model of approximately $3,500 per unit is assumed. Annual operation costs will amount to $945, including depreciation at 20%, interest at 5% and maintenance and labor at 2%. Considering a flock of 100,000 hens, the equivalent of ten units would be required, depending on aviary configuration and the number of rows, contributing to an initial capital cost of $35,000 with an annual fixed cost of $9,450.
For each 1% saving in downgrades from the flock of 100,000 hens at 80% production, an additional 67 dozen eggs per day would be packed and sold that would otherwise have been diverted to breaking stock. At the end of August, nest run cage-free brown was valued at $2.27 per dozen using the published USDA negotiated price, with breaking stock at $1.39 per dozen. The loss associated with downgrading to breaking stock is therefore $0.88 per dozen into the grader. The incremental benefit from the flock from reducing downgrades by each one percent amounts to $59 per day or $21,535 per annum, approximating 75% of the initial capital cost. This calculation is based on the stated nest run differential at the end of August, representing an annual low, and does not consider margins after packing.
If production margin is incorporated in the financial evaluation, an additional $0.18 per dozen can be added to the benefit, assuming a packing and packaging cost of $0.60 per dozen and a price into a warehouse of $3.05 per dozen. This would add $4,402 to annual revenue, contributing to a payback period of 16 months for each one percent reduction in downgrades.
It is recognized that shell damage due to impact at the point of transfer may well attain two percent or more, especially in old installations, during summer, and in aged flocks, further contributing to the return on investment in EggTrax installations.