# What is the effect of switching from a corn-based to a grass-based forage system on the contribution of dairy products to the human nutritional requirements?

L. Rey-Cadilhac, Bruno Martin

## ► To cite this version:

L. Rey-Cadilhac, Bruno Martin. What is the effect of switching from a corn-based to a grass-based forage system on the contribution of dairy products to the human nutritional requirements?. 3rd Mountain Livestock Farming Systems Meeting, Jun 2024, Clermont - Ferrand, France. pp.40. hal-04613767

HAL Id: hal-04613767

https://hal.inrae.fr/hal-04613767

Submitted on 17 Jun 2024

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers.

L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

<figure><img src="image_1.png" /></figure>

Distributed under a Creative Commons Attribution 4.0 International License
# What is the effect of switching from a corn-based to a grass-based forage system on the contribution of dairy products to the human nutritional requirements?

L. Rey-Cadilhac, Bruno Martin

► To cite this version:

L. Rey-Cadilhac, Bruno Martin. What is the effect of switching from a corn-based to a grass-based forage system on the contribution of dairy products to the human nutritional requirements?. 3rd Mountain Livestock Farming Systems Meeting, Jun 2024, Clermont - Ferrand, France. pp.40. hal-04613767

HAL Id: hal-04613767

https://hal.inrae.fr/hal-04613767v1

Submitted on 17 Jun 2024

HAL is a multi-disciplinary open access
archive for the deposit and dissemination of sci-
entific research documents, whether they are pub-
lished or not. The documents may come from
teaching and research institutions in France or
abroad, or from public or private research centers.

L'archive ouverte pluridisciplinaire HAL, est
destinée au dépôt et à la diffusion de documents
scientifiques de niveau recherche, publiés ou non,
émanant des établissements d'enseignement et de
recherche français ou étrangers, des laboratoires
publics ou privés.

<figure><img src="image_1.png" /></figure>

Distributed under a Creative Commons Attribution 4.0 International License
<figure><img src="image_2.png" /></figure>

RÉPUBLIQUE
FRANÇAISE

Liberté
Égalité
Fraternité

INRAE

<figure><img src="image_3.png" /></figure>

Research team

Lucille Rey-Cadilhac¹,²
Bruno Martin¹

¹UCA, INRAE, VetAgro Sup,
UMR12133 Herbivores,

²PEGASE, INRAE, Institut
Agro

# What is the effect of switching from a corn-based to a grass-based forage system on the contribution of dairy products to the human nutritional requirements?

## Context

Grass-fed cows vs corn-fed cows: milk with higher nutritional value.

→ What effect on the contribution of dairy products to meeting human nutritional requirements if all the cows would switch from a corn-based to a grass-based diet ?

<figure><img src="image_4.png" /></figure>

<figure><img src="image_5.png" /></figure>

+/- x % of nutrient needs covered ?

<figure><img src="image_6.png" /></figure>

## Material & methods

Calculation of the contribution of dairy products to nutrient recommended dietary intake according to the dominant forage

→ If dairy consumption is constant

→ If all the milk is produced with a same dominant forage

<figure><img src="image_7.png" /></figure>

EU consumption of dairy products

<figure><img src="image_8.png" /></figure>

Concentration of
nutrients in bulk milk
/ type of forage

<figure><img src="image_9.png" /></figure>

EU consumption of
nutrients through dairy
products / type of forage

<figure><img src="image_10.png" /></figure>

EU Dietary reference
values for each
nutrients

<figure><img src="image_11.png" /></figure>

## Results

Switching from a corn-based diet to a grass-based diet...

... had no major impact on the contribution of dairy products to meeting dietary reference values for mineral & B vitamins

... doubled the contribution of dairy products to meeting dietary reference values of FA:
+ pour essential FA
- For trans FA

... with a stronger effect with mountain than plain grass

<figure><img src="image_12.png" /></figure>

<figure><img src="image_13.png" /></figure>

Products taken into account (no or minor effect of process on nutrients content)

Calcium

Phosphorus

Magnesium

B2 vitamin

B12 vitamin

Linoleic acid

α-linolenic acid

EPA+DHA

Trans FA

<figure><img src="image_14.png" /></figure>

% population dietary reference value covered by dairy products

<figure><img src="image_15.png" /></figure>

<figure><img src="image_16.png" /></figure>

<figure><img src="image_17.png" /></figure>

## Conclusion & perspectives

<figure><img src="image_18.png" /></figure>

No major impact on minerals & B vitamins

++ Essential FA coverage (but ++ trans FA)

<figure><img src="image_19.png" /></figure>

Approach to be continued with integration of water-soluble vitamins & oligo-minerals and be extended to other animal-based products

<figure><img src="image_20.png" /></figure>

Centre INRAE
Bretagne-Normandie / PEGASE

intagt
one quality

<figure><img src="image_21.png" /></figure>

INRAE
16 Le Clos,
35590 Saint-Gilles
France
Contact: lucille.rey-cadilhac@inrae.fr
<figure><img src="image_2.png" /></figure>

RÉPUBLIQUE
FRANÇAISE

Liberté
Égalité
Fraternité

INRAE

<figure><img src="image_3.png" /></figure>

Research team

Lucille Rey-Cadilhac¹,²
Bruno Martin¹

¹UCA, INRAE, VetAgro Sup,
UMR12133 Herbivores,

²PEGASE, INRAE, Institut
Agro

# What is the effect of switching from a corn-based to a grass-based forage system on the contribution of dairy products to the human nutritional requirements?

## Context

Grass-fed cows vs corn-fed cows: milk with higher nutritional value.

→ What effect on the contribution of dairy products to meeting human nutritional requirements if all the cows would switch from a corn-based to a grass-based diet ?

<figure><img src="image_4.png" /></figure>

<figure><img src="image_5.png" /></figure>

+/- x % of nutrient needs covered ?

<figure><img src="image_6.png" /></figure>

## Material & methods

Calculation of the contribution of dairy products to nutrient recommended dietary intake according to the dominant forage

→ If dairy consumption is constant

→ If all the milk is produced with a same dominant forage

<figure><img src="image_7.png" /></figure>

EU consumption of dairy products

<figure><img src="image_8.png" /></figure>

Concentration of
nutrients in bulk milk
/ type of forage

<figure><img src="image_9.png" /></figure>

EU consumption of
nutrients through dairy
products / type of forage

<figure><img src="image_10.png" /></figure>

EU Dietary reference
values for each
nutrients

## Results

Switching from a corn-based diet to a grass-based diet...

... had no major impact on the contribution of dairy products to meeting dietary reference values for mineral & B vitamins

... doubled the contribution of dairy products to meeting dietary reference values of FA:
+ pour essential FA
- For trans FA

... with a stronger effect with mountain than plain grass

<figure><img src="image_11.png" /></figure>

<figure><img src="image_12.png" /></figure>

Products taken into account (no or minor effect of process on nutrients content)

Calcium

Phosphorus

Magnesium

B2 vitamin

B12 vitamin

Linoleic acid

α-linolenic acid

EPA+DHA

Trans FA

<figure><img src="image_13.png" /></figure>

% population dietary reference value covered by dairy products

<figure><img src="image_14.png" /></figure>

<figure><img src="image_15.png" /></figure>

<figure><img src="image_16.png" /></figure>

## Conclusion & perspectives

<figure><img src="image_17.png" /></figure>

No major impact on minerals & B vitamins

++ Essential FA coverage (but ++ trans FA)

<figure><img src="image_18.png" /></figure>

Approach to be continued with integration of water-soluble vitamins & oligo-minerals and be extended to other animal-based products

<figure><img src="image_19.png" /></figure>

Centre INRAE
Bretagne-Normandie / PEGASE

intagt
one quality

<figure><img src="image_20.png" /></figure>

INRAE
16 Le Clos,
35590 Saint-Gilles
France
Contact: lucille.rey-cadilhac@inrae.fr