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Home  > Question of the Week

Question of the Week

Permalink Where can I find resources for on-farm electricity generation by steam engine?


Answer: In response to your inquiry into the purchase of modern steam engines, I have found the following sources:

Reliable Steam Engine Co.
212 Bain Drive
Tidewater, OR 97390
(541) 528-3380

On the website they describe several steam engines they manufacture; they offer both the castings, so a do-it-yourself machinist can produce the final engine, and finished engines. On the website description they say they offer "Small 4-40 HP Steam engines and boilers for sale." They also manufacture boilers and controls.

Mike Brown Solutions
P.O. Box 4884-N
Springfield, MO 65808

Mike Brown Solutions offers one horsepower, three horsepower, and twenty horsepower steam engines. They also offer completed engines or the castings from which a machinist can build the finished engine. There are a couple of books offered, Basics of Steam Engineering and Steam Boiler Basics, and a lot of other materials on a variety of subjects. The web site is a little strange to navigate, but there are a lot of resources there.

Crescent Marine Steam Engines

A New Zealand resource

A listing of engines for sale; most are small, but there are some larger ones

A listing of antique engine shows is on

A listing of steam books is available at

One steam engine under development is the Cyclone engine. It looks like it is designed to work with liquid or gaseous fuels. The engine is under development, but Cyclone feels as though this would be a good application for the engine.

Another small steam engine (the site doesn't indicate Horsepower) is the Green Steam Engine

On the subject of interconnection to the utility, it looks is though Missouri allows net metering of biomass fueled generation up to 100 KW. Their rules can be seen online at

Expect a system to cost in the $30K range and generate enough power to be a net producer of power.



Permalink Can I use silage as supplement for pasture-based beef?

North Carolina

Answer: I am pleased to provide you with information on silage supplementation for pasture-based beef operations.

Types of silage


Crude Protein



Grass and small grain silage




Corn silage




Legume silage (clovers, alfalfa)




Supplementing pasture with silage

Silage is an excellent source of supplemental nutrients. Allow pasture to be the primary feedstuff for the cattle, and feed the supplement later in the day after the cattle have grazed for several hours. Feeding too much energy can reduce pasture intake and result in inefficient pasture utilization.

Silage should be fed to ruminants on pasture when either protein or energy is limiting, and if it is cost effective to make and feed silage, otherwise it is not worth it. Grass silage can be cut, baled, and wrapped much like hay is. This is referred to as haylage, and the ensiling process is completed within the wrapped bale.

High-quality pasture

Supplementation may not be necessary on well-managed, high-quality pastures. Examples are cool-season annual and perennial pastures (ryegrass, wheat, orchardgrass, timothy, and fescue) mixed with legumes (clover, trefoil, alfalfa, vetch) and managed with rotational grazing. Warm season annuals such as sorghum-sudan are excellent pastures that require little supplementation as well. When pastures are high in crude protein and low in fiber (such as during the spring) energy supplementation is helpful to feed rumen microbes and allow better utilization of forage protein. Corn silage might be advantageous at these times. However, large amounts of high fiber feeds will reduce pasture intake. Some other supplements to consider in this situation are corn gluten feed (corn gluten meal plus the bran), wheat midds (screenings from wheat flour processing), and whole cottonseed. If these by-products are available locally, they might be a good substitute for silage if you do not have the ability to make and feed it.

Low-quality or limited pasture

Supplementation of protein on low-quality forages will increase forage intake. If you are grazing limited forages, such as warm-season perennial pastures during the heat of the summer, grass or legume silages would be advantageous. A cost comparison of these silages vs. soybean or cottonseed meal would be good to determine the economic viability of silage feeding. However, the sustainability dimensions of the monocultural production of soy and cottonseed are questionable. Sustainable agriculture is more about balance, health, and appropriate gains as opposed to maximizing gains for economic profit alone. You might also consider other sources of protein you might have available, or can grow in rotation on your farm.

When supplementing ruminants on pasture, consider the following logistics and economic factors:

• Will the added production cover the expense, especially if the feed is shipped from off the farm?
• Is there an inexpensive local source of protein?
• Do you raise the feed on the farm?
• Do you have necessary harvest, storage, and feeding equipment?
• Substitution effect—forage intake decreases with less fibrous, more digestible supplements like corn.

Effect of feedstuff on consumer preference

Most of the work than has been done on consumer preference and palatability of beef has been done lately on pasture-finished vs. grain finished (Martz, 2000 and Rosmann & Rosmann, 2004). I have seen no data on the use of one forage type over another with respect to consumer preference except a study that points out that "beef from grass silage-fed animals had better overall quality in terms of color, lipid oxidation, and vitamin E than beef from maize (corn) silage-fed animals" (O’Sullivan, et al, 2001). Most of the silage ration work done lately involves protein supplementation on cattle eating silage-based diets, in confinement, and silage as a forage-extender. Two examples follow:

1. Growth and carcass characteristics of beef steers fed silage and different levels of energy with or without protein supplementation
Journal of Animal Science, Vol 72, Issue 12 3221-3229, Copyright © 1994 by American Society of Animal Science

H. V. Petit, D. M. Veira and Y. Yu
Experimental Farm, Agriculture and Agri-Food Canada, La Pocatiere, QC.

Fifty-six large-framed crossbred steers averaging 227 kg were used in an experiment including a growing period (24 wk) and a finishing period ending when the steers had approximately 4 to 10 mm of fat thickness (Canadian grade A1). Steers were individually fed and assigned to a completely randomized design with seven treatments for the growing period. From the end of the growing period until slaughter, all steers received the same basal diet. Half of the steers from each treatment used in the growing period received a supplement containing protein and the other half a supplement containing protein and fat. Treatments during the growing phase consisted of 1) timothy silage alone or mixed (on a DM basis) with 2) 7.5% molasses, 3) 15% molasses, 4) 7.5% canola meal, 5) 5.5% canola meal and 7.5% molasses, 6) 3.6% canola meal and 15% molasses, or 7) 15% canola meal. The total N intake from supplements 2, 5, or 6 was similar. Compared with silage fed alone, canola meal supplementation increased (P < .05) ADG, whereas molasses had no effect. Combining molasses and canola meal did not improve ADG compared with feeding only canola meal on an isonitrogenous basis. Canola meal supplementation compared with feeding only silage during the growing phase reduced (P < .05) days on feed, and molasses tended (P = .059) to reduce it. Carcass data were generally similar among treatments.

2. Grass & Forage Science
Volume 43 Issue 3 Page 215 - September 1988
Volume 43 Issue 3

The use of conserved forage as a supplement for grazing dairy cows
C. J. C. Phillips

The difficulty in matching the herbage requirements of grazing dairy cows to herbage production, due mainly to the unpredictability of the latter, causes stocking rates to be too low for maximum per hectare production and, thus, cows to be underfed at certain times in the grazing season. Conserved forage may be used as a supplement for grazing dairy cows in order to reduce variation in forage intake by the cow, to allow pasture stocking rates to be increased and to increase the efficiency of land use. The effect of offering conserved forage with herbage on intakes and production is reviewed in comparison to both ad libitum and restricted herbage. Total nutrient intakes and milk fat + protein yields are reduced for cows offered herbage and supplementary forage compared with cows offered ad libitum herbage, but increased compared with cows offered a restricted herbage level. Increasing pasture stocking rates may allow increases in utilized metabolizable energy levels from grassland but further research is needed in this area. Both grass and maize silage supplements offer potential for increasing the efficiency of land use, but in the case of grass silage this is only achieved in the best management practices.

Environmental Benefits of Pasture-based Beef Production

It is difficult to operate in an industry that has become increasingly integrated, as the American beef industry has. Often proponents of sustainable agriculture must take an incremental approach to achieving sustainability and balance in their farming systems. An example would be utilizing equipment and fossil fuels to make and feed grass silage over buying heavily subsidized and transported soybean meal to supplement cattle on pasture. A case can be made that on-farm production of feed is more sustainable than buying from off the farm.


Martz, F. 2000. Pasture-based finishing of cattle and eating quality of beef. University of Missouri-Columbia.

O’Sullivan, A., K. O’Sullivan, K. Galvin, A.P. Moloney, D.J. Troy, and J.P. Kerry. 2002. Grass silage versus maize silage effects on retail packaged beef quality, in J. Anim. Sci. 2002. 80:1556-1563.

Rosmann, R. and M. Rosmann. 2004. Feeding beef cattle to produce healthier and highly acceptable beef. Santa Cruz, CA: Organic Farming Research Foundation.



Permalink Are sea kelp and diatomaceous earth good supplements for goat nutrition?


Answer: A couple of ATTRA publications cover basic nutrition for goats, including Goats: Sustainable Production Overview, and Meat Goats: Sustainable Production. Goats will be healthiest and most productive when they have a diverse selection of growing forages, including browse plants. Given a selection, goats will chose the most nutritious diet for themselves. Providing clean water and a mineral mix is also essential for proper goat nutrition.

You specifically asked about sea kelp and diatomaceous earth (DE). A couple of resource articles listed below discuss using kelp and DE. Goat producers that use kelp in their rations seem happy with the results, citing improved hair coats and healthier animals. Most use it as part of their mineral mix and some top dress grain with it. The article listed below shows the nutrient analysis for one brand of kelp. Kelp can be quite expensive, so the cost may be prohibitive.

Diatomaceous earth has been said to help control internal parasites in goats; however, no research has shown that DE has an effect on internal parasites. The article on parasite management listed below discusses this further.

To locate a source of DE and kelp I would suggest contacting a local feed mill or farmers' cooperative. They may carry these products or may be able to order them for you. You can also buy DE and kelp from Hoegger Goat Supply (, 800-221-4628) and Caprine Supply (, 800-646-7736).


Stultz, J. 2004. Sea Kelp: A Healthy Choice for Dairy Goats? Dairy Goat Journal. Vol. 82, No. 3. p. 46, 48.

Wells, A. 2005. Sustainable Parasite Management for Goats.



Permalink What are some options for marketing medicinal herbs?


Answer: Medicinal herbs—especially native species—have been extensively investigated over the past 25 years as possible alternative crops for small farmers. Summaries of research are included in our publication Herb Production in Organic Systems. Much of the research, as you will see, has been conducted by small farmers who received Sustainable Agriculture Research and Education grants, funded by USDA for a total of about $2 million dollars.

Unfortunately, reliable mainstream bulk markets for domestic suppliers have never materialized. Most growers have found they must formulate and market their own products, or go into entertainment farming, event hosting, plant sales, or related ventures. The Resource article listed below offers the latest available sales figures for medicinal herb product sales in the U.S. (2005). Table 1 in this article reveals that market demand stopped its double-digit growth about 1999. Keep in mind that much of the supply now comes from outside the U.S. There is considerable fluctuation year-by-year in demand for medicinal herbs that are manufactured into dietary supplements. Combinations of herbs have begun to show more growth than single herbs, according to Table 4 in the article.

Kansas State University has shown considerable interest in developing alternative crops for Midwest growers. KSU’s Center for Sustainable Agriculture and Alternative Crops publishes Links to Buyers and Sellers (Herbs) at

Most buyers and many farms now do business over the Internet. Some growers/ gatherers place classified ads in the "Herb Trade" section of I have listed contact information below for several companies that trade in medicinal herbs.

A comprehensive feasibility study of medicinal herbs as a farm crop was done by the Montana Department of Agriculture and USDA a few years ago.(1) It can be viewed online or downloaded.


1) Brester, Gary, Kole Swanser, and Tim Watts. 2002. Market Opportunities and Strategic Directions for Specialty Herbs and Essential Oil Crops in Montana. Prepared for Montana Department of Agriculture and USDA Federal-State Marketing Improvement Program. Watts and Associates, Billings, MT. 64p.


Blumenthal, Mark, Grant K.L. Ferrier, and Courtney Cavaliere. 2006. Total sales of herbal supplements in United States show steady growth: Sales in mass market channel show continued decline. HerbalGram. No. 71. p. 64–66.

List of Buyers:

American Botanicals
P.O. Box 158
24750 Hwy. FF
Eolia, MO 63344
(573) 485-2300

Appalachian Root & Herb Co.
37 Center Street
Rainelle, WV 25430
(304) 438-5211, 438-5212
Since 1972.

Blessed Herbs Inc.
109 Barre Plains Road
Oakham, MA 01068-9675
(508) 882-3839
(800) 489-4372
(508) 882-3755 FAX

Bouncing Bear Botanicals
P.O. Box 1993
Lawrence, KS 66044

Windy Pines Natural Herb Farm
23295 Marge Lane
Dix, IL 62830
(618) 266-7351
Native medicinals only; must be clean.

Southern Botanicals
9750 W. Sample Road, Ste. B
Coral Springs, FL 33065-4047
(954) 752-5001
Wildcrafted botanicals.

Star West Botanicals
11253 Trade Centre Dr.
Rancho Cordova, CA 95742
(916) 638-8100 (ph./FAX)



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