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!
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:
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.
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!
This website has been a goldmine of information for all sorts of tree/shrub fodder, various crops. It's still in development for many things as they are continuously adding and updating stuff, so if you don't find what you're looking for it may be put in sometime down the road, be patient it's an insanely massive undertaking to get all this data.
Sharing another research update in this thead: Steve Gabriel of Wellspring Forest Farm in NY recently completed a SARE-funded project on the nutritional value of various tree fodders in ruminant grazing systems.
They looked at:
""Key findings from this project were:
A. Tree Fodders offer a valuable supplement and emergency food supply for grazing livestock. They are not likely from a management perspective to replace grass and legume forages, but rather offer more nutrient-rich options to a diverge livestock grazing diet.
B. All tree fodders we studied had good relative feed, ADF, and NDF values, indicating they are viable feeds for livestock.
C. Each species brings something different to the table, and not one better than the other. Together they offer a diverse diet to complement grass and legume forages.
D. Macro and micro nutrients are more concentrated in some species versus others, and they flux over the season in complex ways.
E. There were not significant trends or timing deemed critical in feeding these species, as even the lower values were sufficient to meet nutrition needs.
F. Some mineral concentrations are so high there may be some need to have concern with toxicity. In our analysis none of the forages with exceptionally high numbers presented clear toxicity concerns, but is is important to share this as a potential consideration. Feeding fodder in moderation is always recommended.
G. Each species has their own unique profile:
Black Locust is highest valued for its high crude protein content which declines over the season, as well as values for Potassium (little change during the season) and Manganese highest in early July but also spiking in early Sept and Oct, with lowest values of ADF and NDF from early August through early September.
Buckthorn offers a good crude protein content, along with elevated levels of Potassium, Calcium, and Iron, which are highest in the latter end of the season (early October) while NDF and ADF are lowest in September.
Honeysuckle offers a great source of Calcium and Magnesium which is highest toward the end of the season, and Iron which appeared highest in July.
Poplar provides good levels of Calcium, Zinc, and Manganese. While the calcium is greater in the end, the levels of Zine and Manganese appear relatively dispersed through the season, though since its contribution as far a calcium is not as significant as other species.
Wild Cherry’s contributions are Manganese and Calcium, though this foliage doesn’t stand out substantially in comparison with the others, and so it may not matter as much. It’s pretty low value.
Willow is a nutrient sink, offering good values for Calcium, Magnesium, Zinc, and Manganese.
The results give us a compelling reason to continue to develop efficient systems to propagate, plant, manage and feed most of these species in our farm landscape. Forage analysis did prove to help us better understand the benefits, and could be extended to other species we want to learn about, without the need to test so intensively. Testing a new species at the beginning, middle, and end of the season would offer a reasonable snapshot of its feed value.
From a management perspective, the results support our plans to further plant out willow, poplar, and black locust extensively on the farm, species which also meet other objectives within our stewardship goals. We also will continue to manage honeysuckle and buckthorn to reduce their spread but also to provide robust sources of fodder for lean times (drought). ""