Hello everyone!

We live in northern Canada, we have Aspen, birch, popular, willows and various wild roses and berry shrubs as well as white and black spruce mainly some pine. What I have been trying to find is a page or paper that lists some of the feed values for fodder tree leaves? Does anyone here have a link like that handy? Thank-you in advance!

Jackie

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If you dig around under the www.agri-dynamics.com website (their page appears to temporarily be down so I can't post the direct link), there's a chart showing the results of some sampling that Jerry Brunetti did some years back of a wide variety of common woody plants and broadleaf herbaceous "weeds".  He tested the plants not only for crude protein and digestible fiber, but also for some nutrients like sulfur.   In general, the results showed that many woody plants (the soft, edible portions) were quite nutritious and palatable when compared to a quality forage plant like alfalfa.

tatiana Stanton also collected some similar data during Cornell's "Goats in the Woods" study that ended ~ 12 years ago.  I don't see a chart in the final report, so will ask her if she can post that here.

Joe Orefice many also have some data from his SARE project in northern NY.  Joe?

A few thoughts related to this topic:

  1. observe what the wildlife (especially, the hooved ungulates) in your area eat - or don't eat. My guess is that the tree species that you list would make pretty good food - especially in the first half of the growing season.  The shrubs probably not as much, as they're most likely adapted to be less tasty to wildlife so that they don't get browsed to death.  Trees have the ability to outgrow browsing, whereas shrubs do not.
  2.  plant nutritional analysis can usually be done for < $20/sample.  Check with a local dairy or crop farmer to see where they send their stuff for testing.  Word of caution: just because a sample has good protein and digestibility numbers doesn't mean that animals will readily eat it.  The plant could be very high in some elements or compounds that make it taste bad - or even mildly toxic to livestock.  An example that comes to mind are the oils in birch (may or may not be an issue - ?).  A more expensive, detailed analysis may be justified if you want to see all the "fine details" of just what's in a plant.  But the bottom line is will the livestock eat it or not?  Two other factors that can affect consumption are: overall diet, and familiarity with the plant.  Diet can help - or limit - an animal's ability to tolerate, digest and process plant compounds.  Recommend reading up on Fred Provenza's work for some insights into this.  it's too complicated for me to understand, so I just try to keep our animals exposed to a diverse grazing smorgasbord and let them figure it out.   As for familiarity, take a look at Kathy Voth's website: www.livestockforlandscapes.com  I've had the opportunity to hear Kathy present several times and she does a nice job of showing how animals can be trained to eat new things.
  3. Most browse, like forages, will change in their nutritional values and palatability throughout the growing season.  Something that makes good feed in June with new, green leaves may not be nearly as good by September when the leaves are riddled with insect and disease damage and getting ready to drop for the winter.

Thank-you very much for your reply Brett!

I will look over everything you have sent me. I understand the points you have made regarding the fresh new growth compared to late summer. Another thing we are thinking to try is to coppice through the aspen/popular forest areas in a thinning fashion to open up the canopy for more sun to get other forbes/grasses to grow in the understory while allowing the new sprouts to be self grazed? Have very many people tired this?

Shana Hanson in Maine recently shared this report from her study done with help from U of Vermont.  The announcement of the study is pasted below, and the referenced report is attached as .pdf.

Tree Leaf Silages and Dried Leaves as Livestock Feed Alternatives

Shana Hanson, 3 Streams Farm, Belfast, ME

A 2019 UVM mini-grant funded nutritional testing of winter-stored tree leaf fodders, the Final Report of which is now posted at link below:

UVM Final Report: Lab Nutritional Analysis of Ensiled Tree Leaves & ... Chipped Leafy Branches...

Lab tested tree leaf fodders included 8 species of chipped leafy branch silages, hand-stripped leaf silages, and dried leaves from tarped leafy branch piles. These fodders were produced as part of SARE FNE18-897, a two-year study which created and described a 1 acre Demo Plot of “air meadow” tree canopy harvest (Figure 2 below), measured yield, labor hours, and goat consumption rate, and recorded cattle, sheep, goat and hog responses to various fresh and stored tree leaf fodders (Figure 3 below).

The stored tree leaf fodders included 8 species of chipped leafy branch silages, hand-stripped leaf silages, and dried leaves from tarped leafy branch piles. These fodders were produced as part of SARE FNE18-897, a two-year study which created a 1 acre Demo Plot of “air meadow” tree canopy harvest plus recorded animal responses to various tree leaf fodders. The SARE FNE18-897 Final Report can be found at:

SARE FNE18-897 Final Report

These white ash, white and yellow birch, red maple, red oak, big-toothed and quaking poplar, and hybrid willow tree leaf fodders were found to have higher Relative Feed Values than grass-based fodders and a rich assortment of minerals, but lower protein availability. Differences in nutrition of chipped versus leaf-only silages, and in ensiled versus dried fodders were examined, and livestock responses from SARE FNE18-897 were juxtaposed with lab data.

Next steps include modification of chipper/shredder equipment to try separation of lighter leaf matter from heavier wood chips, for more densely nutritious silages, and exploration of the acids and life in tree leaf silages, which are very aromatic and palatable, but different than those in grass silage.

Tree leaf based feeds were traditional for many millenia. Layers of foliage can remediate climate disruption. With use of modern equipment and further study, tree leaves have potential to contribute to food- and climate- security today.

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Thank you so very much for sharing this update! Extremely helpful right now! 


I am going to make a post about you and this info on our small Facebook page, thanks again!

jackie Milne 

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