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Home » Authors » Sophie Eaglen
Sophie Eaglen

Sophie Eaglen

International Program Director / National Association of Animal Breeders Inc./Certified Semen Services Inc.
Email Sophie Eaglen
Articles

ARTICLES

A reference guide for the inbreeding discussion

Inbreeding continues to be a topic among members of the dairy industry. This article discusses how methods of genetic advancement factor inbreeding into calculations.
March 3, 2026
Sophie Eaglen

While messages in our industry about inbreeding can be mixed, the facts are clear. Published trends show a steep upward trajectory in inbreeding. This is a natural consequence of high selection intensity and rapid genetic gain. That gain has brought significant genetic progress, which, by current estimates, often outweighs the financial costs of inbreeding depression.


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An analytical approach: Three trends in the A.I. industry

This article explores three recent trends in the U.S. cattle semen industry, along with the potential disadvantages of these changes.
August 8, 2024
Sophie Eaglen

The cattle semen industry is undergoing significant changes, driven by the intersection of technology, market demands and innovative reproductive practices. Statistics from the National Association of Animal Breeders (NAAB) highlight ongoing and emerging trends.


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Semen tank

Why use pooled semen?

A recent trend of blending semen from several bulls into one straw could increase fertility.
July 13, 2023
Sophie Eaglen

As a dairy geneticist, I am trained to preach precision breeding for high genetic gain. Therefore, mixing multiple bulls in one semen straw felt counterintuitive. But the dairy industry is not what it was 50, 30 or even 15 years ago.


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Semen tank

How does a dairy bull get a U.S. genomic evaluation?

Genomic evaluations become increasingly useful when planning your future herd. Collaborating industry partners make these evaluations possible.
January 19, 2023
Sophie Eaglen

Ever wondered how the bulls you work with get a genomic evaluation? It's a detailed process; learn more about it from NAAB geneticist Sophie Eaglen.


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En matière d’indices de sélection, il n’y a pas de solution passe-partout

Les indices de sélection sont la méthode de reproduction privilégiée pour de nombreux caractères, tout particulièrement quand leur utilisation concorde avec les objectifs de reproduction de la ferme.
January 1, 2023
Sophie Eaglen

Tous les éleveurs de bovins conviendront que les indices de sélection sont le moyen privilégié pour sélectionner simultanément plusieurs caractères qui affectent la rentabilité du troupeau.


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When it comes to selection indexes, there is no one size fits all

Selection indexes are a preferred method to breed for multiple traits, especially when their use aligns with a farm's breeding goals.
September 3, 2022
Sophie Eaglen

All cattle breeders will agree that selection indexes are the preferred way to simultaneously select for multiple traits that affect herd profitability.



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To ‘A2’ or not ‘A2’ – that is no longer the question

April 19, 2022
Sophie Eaglen
It is now a standard feature on any bull evaluation page: the genotype for beta casein, better known as A2. Despite not being a trait, nor a genetic defect, the A2A2 genotype has grown to become an undeniable marketing tool.
Read More

Heifer Livability: Where is the buzz?

April 19, 2021
Sophie Eaglen
Heifer Livability: The new trait was released in December, but 99% of the attention went to the simultaneously released Feed Saved trait. Of course, we have been getting used to Cow Livability for a while, but it is still worthwhile to reflect on Heifer Livability for several reasons.
Read More
0621PD

Heifer Livability – where is the buzz?

March 23, 2021
Sophie Eaglen
Heifer Livability: The new trait was released in December, but 99% of the attention went to the simultaneously released Feed Saved trait. Of course, we have been getting used to Cow Livability for a while, but it is still worthwhile to reflect on Heifer Livability for several reasons.
Read More

The infamous haplotypes: Are they really all that bad?

February 24, 2021
Sophie Eaglen
Do you ever feel like the age of genomics has made dairy cattle breeding more complicated? Or perhaps more scientific? While genomics brought us accelerated progress, it has also introduced us to a range of terms previously used by scientists alone.
Read More
View All Articles by Sophie Eaglen
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