METHOD FOR DETERMINING THE QUALITY OF A SEMEN OF A VERTEBRATE ANIMAL

• US 20180313751A1
• Filed: 10/15/2016
• Published: 11/01/2018
• Est. Priority Date: 10/21/2015
• Status: Active Grant

• Current Assignee: Union Evolution Co.
• Original Assignee: Union Evolution Co.
• Inventors: Guillaume, Francois, Le Corvec, Maena, De Bretagne, Thomas, Michel, Gildas, Basquin, Stephane, Charreaux, Frederic, Tariel, Hughes, Guyonnet, Benoit
• Granted Patent: US 10,379,041 B2
• Time in Patent Office: Days
• CPC Class Codes: A01K 67/02 Breeding vertebrates
• CPC Class Codes: G01N 21/35 using infrared light G01N21/39 takes precedence
• CPC Class Codes: G01N 21/3577 for analysing liquids, e.g. polluted water
• CPC Class Codes: G01N 33/487 of liquid biological material

Abstract

A method is provided for determining quality of semen of a vertebrate animal. The method includes the following steps: measuring at least one absorption spectrum of a sample of the semen; selecting a number n of wave numbers σ_{j (j∈[1:n])} which are characteristic of the semen of the breed or of the species of the animal; determining from the absorption spectrum or spectra of a value of the absorption X_j and/or a value of the second derivative of the absorption X_j″_(j∈[1:n]) for each of the n wave numbers σ_{j (j∈[1:n])}; and calculating a non-return rate Y at a predefined number of days from the absorption values X_j and/or from the second derivative of the absorption X_j″ previously determined.

Claims

1. A method for determining the quality of a semen of a vertebrate animal, the method comprising:

measuring at least one absorption spectrum of a sample of said semen;

selecting a number n, with n≥

4, of wave numbers σ

<sub>j (j∈

[1;

n])</sub> which are characteristic of semen of a breed or of species of said animal;

determining from said at least one absorption spectrum of a value of the absorption X_j and/or a value of the second derivative of the absorption X_j″

<sub>(j∈

[1;

n])</sub> for each of said n wave numbers σ

<sub>j (j∈

[1;

n])</sub>;

calculating a non-return rate Y at a predefined number of days from said absorption values X_j and/or from the second derivative of the absorption X_j″

previously determined.

2. The method for determining the quality of a semen according to claim 1, wherein said non-return rate Y is calculated according to the mathematical law Y=β

₀+Σ

_j=1ⁿβ

_jX_j″

, wherein X_j″

<sub>(j∈

[1;

n])</sub> is the normalized second derivative of the absorption value for the wave number σ

_j and the weighting coefficients β

₀ and β

<sub>j (j∈

[1;

n])</sub> are constants.

3. The method for determining the quality of a semen according to claim 1, wherein the values of said weighting coefficients are obtained from a processing of measurements of the absorption spectra of a plurality of semen samples from a population of reference vertebrate, of which the non-return rates are known.

4. The method for determining the quality of a semen according to claim 1, wherein in said measuring, at least 2 absorption spectra of a sample of said seed are measured and said determining values of absorption and/or of second derivatives of the absorption comprises averaging said measured spectra from which said values of the absorption and/or the second derivatives of the absorption are determined.

5. The method for determining the quality of a semen according to claim 1, wherein the number n of wave numbers σ

<sub>j (j∈

[1;

n])</sub> is greater than or equal to 7.

6. The method for determining the quality of a semen according to claim 1, wherein said wave numbers are each representative of a molecule or set of molecules selected from the group consisting of:

lipids;

carbohydrates;

proteins;

nucleic acids;

a combination of a lipid, carbohydrate, protein, or nucleic acid molecule with at least one other lipid, carbohydrate, protein, or nucleic acid molecule.

7. The method for determining the quality of a semen according to claim 1, wherein said vertebrate is a bull and the non-return rate is a 90-day non-return rate, said bull coming from a breed selected from the group consisting of the following breeds:

Abondance, Bé

arnaise, Bordelaise, Bretonne pie noir, Brune, Froment du Lé

on, Jersiaise, Montbé

liarde, Pie rouge des plaines, Prim'"'"'Holstein, Rouge flamande, Bleue du nord, Normande, Salers, Tarentaise.

8. The method for determining the quality of a semen according to claim 1, wherein at least one of said wave numbers σ

<sub>j (j∈

[1;

n])</sub> is selected in the wave number range [960 cm<sup>−

1</sup>;

1100 cm<sup>−

1</sup>], [1440 cm<sup>−

1</sup>;

1550 cm<sup>−

1</sup>] or [2800 cm<sup>−

1</sup>;

3200 cm<sup>−

1</sup>] or in the amide B band.

9. The method for determining the quality of a semen according to claim 1, wherein said wave numbers σ

<sub>j (j∈

[1;

n])</sub> are selected from the group consisting of 3165±

1 cm<sup>−

1</sup>, 3136±

1 cm<sup>−

1</sup>, 3103±

1 cm<sup>−

1</sup>, 3071±

1 cm<sup>−

1</sup>, 3026±

1 cm<sup>−

1</sup>, 2977±

1 cm<sup>−

1</sup>, 2975±

1 cm<sup>−

1</sup>, 1736±

1 cm<sup>−

1</sup>, 1689±

1 cm<sup>−

1</sup>, 1661±

1 cm<sup>−

1</sup>, 1618±

1 cm<sup>−

1</sup>, 1515±

1 cm<sup>−

1</sup>, 1448±

1 cm<sup>−

1</sup>, 1430±

1 cm<sup>−

1</sup>, 1344±

1 cm<sup>−

1</sup>, 1338±

1 cm<sup>−

1</sup>, 1336±

1 cm<sup>−

1</sup>, 1316±

1 cm<sup>−

1</sup>, 1214±

1 cm<sup>−

1</sup>, 1183±

1 cm<sup>−

1</sup>, 1103±

1 cm<sup>−

1</sup>, 1099±

1 cm<sup>−

1</sup>, 1020±

1 cm<sup>−

1</sup>, 975±

1 cm<sup>−

1</sup>.

10. The method for determining the quality of a semen according to claim 9, wherein the number n of said selected wave numbers σ

<sub>j (j∈

[1;

n])</sub> is equal to thirteen and the values of said thirteen selected wave numbers σ

<sub>j (j∈

[1;

n])</sub> are;

3165±

1 cm<sup>−

1</sup>, 3136±

1 cm<sup>−

1</sup>, 3103±

1 cm<sup>−

1</sup>, 2975±

1 cm<sup>−

1</sup>, 1736±

1 cm<sup>−

1</sup>, 1661±

1 cm<sup>−

1</sup>, 1515±

1 cm<sup>−

1</sup>, 1448±

1 cm<sup>−

1</sup>, 1430±

1 cm<sup>−

1</sup>, 1316±

1 cm<sup>−

1</sup>, 1214±

1 cm<sup>−

1</sup>, 1020±

1 cm<sup>−

1</sup>, 975±

1 cm<sup>−

1</sup>.

11. The method for determining the quality of a semen according to claim 9, wherein the number n of said selected wave numbers σ

j (j_∈

[1;

n]) is equal to fifteen and the values of said fifteen selected wave numbers (j σ

j_∈

[1;

n]) are;

3071±

1 cm<sup>−

1</sup>, 3026±

1 cm<sup>−

1</sup>, 2977±

1 cm<sup>−

1</sup>, 1689±

1 cm<sup>−

1</sup>, 1618±

1 cm<sup>−

1</sup>, 1515±

1 cm<sup>−

1</sup>, 1430±

1 cm<sup>−

1</sup>, 1344±

1 cm<sup>−

1</sup>, 1338±

1 cm<sup>−

1</sup>, 1336±

1 cm<sup>−

1</sup>, 1183±

1 cm<sup>−

1</sup>, 1103±

1 cm<sup>−

1</sup>, 1099±

1 cm<sup>−

1</sup>, 1020±

1 cm<sup>−

1</sup>, 975±

1 cm<sup>−

1</sup>.

12. The method for determining the quality of a semen according to claim 1, wherein the measuring at least one absorption spectrum comprises preparing said sample from said semen.

13. The method for determining the quality of a semen according to claim 1, further comprising comparing said non-return rate Y with a predetermined threshold, for selecting said semen for reproduction purposes in case where said non-return rate Y is greater than or equal to said predetermined threshold.

14. The method for determining the quality of a semen according to claim 13, wherein the said threshold is greater than or equal to 0.4.

15. The method for determining the quality of a semen according to claim 1, wherein in said measuring, at least 3 absorption spectra of a sample of said seed are measured and said determining values of absorption and/or of second derivatives of the absorption comprises averaging said measured spectra from which said values of the absorption and/or the second derivatives of the absorption are determined.

16. The method for determining the quality of a semen according to claim 1, wherein the number n of wave numbers σ

<sub>j (j∈

[1;

n])</sub> is greater than or equal to 9.

17. The method for determining the quality of a semen according to claim 1, wherein the number n of wave numbers σ

<sub>j (j∈

[1;

n])</sub> is greater than or equal to 13.

18. The method for determining the quality of a semen according to claim 1, further comprising comparing said non-return rate Y with a predetermined threshold, for selecting said semen for reproduction purposes in case where said non-return rate Y is greater than or equal to said predetermined threshold, wherein the said threshold is greater than or equal to 0.4.

19. The method for determining the quality of a semen according to claim 1, further comprising comparing said non-return rate Y with a predetermined threshold, for selecting said semen for reproduction purposes in case where said non-return rate Y is greater than or equal to said predetermined threshold, wherein the said threshold is greater than or equal to 0.5.

20. The method for determining the quality of a semen according to claim 1, further comprising comparing said non-return rate Y with a predetermined threshold, for selecting said semen for reproduction purposes in case where said non-return rate Y is greater than or equal to said predetermined threshold, wherein the said threshold is greater than or equal to 0.6.