Measurement of avian embryo movement in intact eggs

• US 5,173,737 A
• Filed: 09/26/1991
• Issued: 12/22/1992
• Est. Priority Date: 09/26/1991
• Status: Expired due to Fees

• Current Assignee: The United States of America As Represented By The Secretary of Agriculture
• Original Assignee: United States Department Of Agriculture
• Inventors: Perdue, Michael L., Mitchell, Bailey W.
• Primary Examiner(s): Rosenberger, Richard A.
• Application Number:
  US07/765,744
• Time in Patent Office: 453 Days
• Field of Search: 356/52, 356/53, 209/511, 209/577, 119/6.8
• US Class Current: 356/53
• CPC Class Codes: A01K 45/00 Other aviculture appliances, e.g. devices for determining whether a bird is about to lay
• CPC Class Codes: G01N 33/085 by candling

Abstract

The present invention provides measurement of avian embryo movement in intact eggs by: directing light into and through at least one intact avian egg, with light of sufficient intensity and duration to stimulate embryo movement, whereby portions of the light exit the at least one intact avian egg; sensing instantaneous intensities of the portions of the light exiting each of the eggs, and; determining a ratio of, range of sensed light intensities (I_R) to average sensed light intensities (I_A), for each of the eggs. The ratio of I_R :I_A is a measure of avian embryo movement.

Claims

1. An apparatus for measuring avian embryo movement, in at least one intact egg comprising:

egg holder means for holding at least one intact avian egg;

light source means, operably associated with said egg holder means, for directing light into and through each said at least one intact avian egg, said light being of sufficient intensity and duration to stimulate embryo movement, whereby portions of said light exit each said at least one intact avian egg;

light intensity sensor means, operably associated with said egg holder means and said light source means, for sensing instantaneous intensities of said portions of said light exiting each said at least one intact avian egg, and;

determining means, operably associated with said light intensity sensor means, for determining a ratio of range of sensed light intensities to average sensed light intensities, for each said at least one intact avian egg, said ratio being an indication of avian embryo movement.

2. The apparatus of claim 1 further including indicator means, operably associated with said determining means, for indicating said ratio for each said at least one intact avian egg.

3. The apparatus of claim 1 further including recording means, operably associated with said determining means, for recording said instantaneous light intensities and said ratio for each said at least one intact avian egg.

4. The apparatus of claim 1 wherein:

said light intensity sensor means is a transducer means for providing electrical signals proportional to sensed light intensities, and

further including signal conditioning means, operably associated with both said light intensity sensor means and said determining means, for conditioning said electrical signals.

5. The apparatus of claim 1 wherein said light intensity sensor means is selected from the group consisting of at least one:

Cadmium-Sulfide sensor means, phototransistor, photodiode and photomultiplier tube.

6. The apparatus of claim 1 wherein,

said egg holder means functions to hold plural intact avian eggs,

said light source means includes plural light sources for directing light into and through each of said plural intact avian eggs,

said light intensity sensor means includes plural light intensity sensors for sensing instantaneous intensities of said portions of said light exiting each of said plural intact avian eggs, and

said determining means functions to determine a said ratio of range of sensed light intensities to average sensed light intensities, for each of said plural intact avian eggs.

7. The apparatus of claim 1 wherein said light source means includes at least one fluorescent light source.

8. The apparatus of claim 1 wherein said egg holder means, light source means and light intensity sensor means, are positioned within an egg incubator means.

9. The apparatus of claim 1 further including,

control means for controlling operation of said light source means, and

analog to digital converter means, and digital I/O means, operably associated with both said control means and said light source means.

10. The apparatus of claim 9 wherein said analog to digital converter means, is also operably associated with said light intensity sensor means, and functions to condition and convert analog electrical signals from said light intensity sensor means to digital electrical signals.

11. A process for measuring avian embryo movement in at least one intact egg, comprising:

directing light into and through at least one intact avian egg, said light being of sufficient intensity and duration to stimulate embryo movement, whereby portions of said light exit each said at least one intact avian egg;

sensing instantaneous intensities of said portions of said light exiting each said at least one intact avian egg, and;

determining a ratio of, range of sensed light intensities to average sensed light intensities, for each of said at least one intact avian egg, wherein each said ratio provides a measure of avian embryo movement.

12. The process of claim 11 further including the step of utilizing indicator means to indicate said sensed light intensities and said ratio for each said at least one intact avian egg.

13. The process of claim 11 further including the step of recording said sensed light intensities and said ratio for each said at least one intact avian egg.

14. The process of claim 11 wherein said step of sensing includes positioning adjacent to the shell of each said at least one intact egg a transducer means for providing electrical signals proportional to sensed light intensities, and further including the steps of conditioning electrical signals produced by said transducer means so as to produce conditioned electrical signals, and utilizing said conditioned electrical signals in said step of determining.

15. The process of claim 11 wherein avian embryo movement in a plurality of intact eggs is measured within a time interval of less than ten minutes.

16. The process of claim 11 wherein said step of directing light includes use of at least one fluorescent light source.

17. The process of claim 11 wherein said steps of directing light and sensing intensities are carried out in an egg incubator means.

18. The process of claim 11 wherein each said at least one intact avian egg has an air space, and said step of sensing includes sensing instantaneous intensities of said portions of said light exiting each said at least one intact avian egg just below said air space.

19. The process of claim 11 further including the step of assessing pathogenicity based on change of said ratio with time, and classifying as dead each said at least one intact egg having a said ratio of 0.02 or less.