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Benefits the whole farm! |
MARK HONEYMAN
AMES. IowaAt first glance, swine
production doesn't seem to play a major role in sustainable farming
systems. If anything, hog production may contribute to ecologically
unsound agriculture, both by encouraging row-crop production
on marginal land and by producing manure which can pollute surface
water and groundwater.
But it doesn't have to be that way. Hogs can be raised using practices
that are profitable as well as humane and ecologically sound.
These practices also can create much-needed jobs in the Corn Belt,
and improve both the quality of pork produced and the quality
of life for pork producers. The key is rethinking management to
meet the needs of the whole hog, to the benefit of the whole farm.
Mixed crop-livestock farms make sustainable farming easier by
providing diverse crops, manure to cycle nutrients, value-added
livestock to sell and year-round employment for farmers. In the
Corn Belt, hogs are the livestock of choice. In Iowa, they account
for one-third of our state's cash farm income. Forty percent of
Iowa farms have hogs, and the pork industry employs about 4.3
percent of our workforce.
In recent years, hog production has been concentrated on fewer
and larger farms. The average number of hogs per farm in Iowa
has risen steadily from fewer than 100 in the '50s to more than
350 in 1987. Farms producing more than 1 ,000 head per year accounted
for nearly half of all hogs marketed in the state. Nationwide,
such farms account for 70 percent of hogs sold.
Even with increasing concentration smaller producers can remain
competitive by taking advantage of Sus scrota's remarkable
versatility and ability to fit into sustainable farming systems.
Here are five areas to watch.
1. Feeding
Pig rations in the Corn Belt consist primarily of corn and soybeans.
But they don't have to. Nutritionists know that pigs can use a
wide variety of feeds. In fact, F.H. King noted this important
role for pigs nearly 80 years ago in his description of Chinese
agriculture, Farmers of 40 Centuries: "It is remarkable,"
he wrote, "that these ancient people came long ago to discard
cattle as milk and meat producers; to use sheep more for pelts
and wool than for food; while swine are the one kind of the three
classes which they retained in the role of middleman as transformers
of coarse substances into food."
The Corn Belt pig also is such a middleman, now for quality grains.
By changing the Corn Belt pig's diet, we can change the face of
Corn Belt agriculture.
Hog production built around a more diverse crop base would be
more sustainable because it would fit in better with life in the
Midwest, from soil microbes to human activity. Just producing
corn and soybeans for export is not sustainable over the long
haul. The pig, one of the major reasons for intensive production
of these two crops in Iowa, is an extremely versatile animal.
The limitation comes from the mindset of the producers, our economic
system, policy (to some degree) and the past. While government
policy now supports the value of corn, future calculations may
factor in benefits of alfalfa because of its environmental contributions.
The digestive system of the pig is similar to humans, which some
people say makes it a competitor with humans for food. The other
way to look at it is that it can be used to eat the things we
don't, like animal and food processing by-products and kitchen
wastes available in quantity near Midwestern population centers.
These sources are associated with problems such as pathogens,
quality variability and bulkiness, but there is potential, as
well.
Because gestating sows have low energy needs and large digestive
tracts, fibrous feedstuffs and protein by-products can make up
as much as 90 percent of their rations, studies show. High levels
of alfalfa hay or haylage can maintain or even improve reproductive
performance. Also acceptable are alfalfa-orchardgrass hay, grass
silage, sunflower and soybean hulls, distiller's grain, corn-gluten
feed, corn and cob meal, beet pulp, and wheat middlings. Even
growing-finishing rations can be 10 percent to 30 percent forage,
if energy levels are maintained.
What's exciting about all this is how increasing forage levels
in swine feed would change cropping patterns in the fields. Take
a hypothetical 400-acre corn-soybean operation producing 2,000
hogs annually with no forages. It would require 70 acres of alfalfa
for the legume to make up 25 percent of the ration, at 210 pounds
per head per year. This would put 17 percent to 20 percent of
the farm in alfalfa every year. Think of the tremendous effect
this would have on fertilizer needs, weed control, water quality
and soil conservation.
If you encourage farmers to add forages to their corn-bean rotation,
they ask, "What will I do with the hay?" "Feed
it to the pigs!" is one answer. If all pork producers in
Iowa fed 25-per-cent alfalfa, it would increase acreage 15 percent
to 350,000 acres.
2. Housing
As more hogs come from fewer farms, swine housing is almost synonymous
with confinement. Many confinement facilities were built in the
'70s when labor costs grew faster than capital costs and inflated
asset values were leveraged to pay for new construction. As a
result, from 1973 to 1982, fixed costs of depreciation, taxes
and insurance nearly doubled from $1.94 to $3.80 per hundredweight,
according to Iowa State University studies. However, the studies
show, the increase in efficiency with these structures generally
isn't enough to offset increased costs. Partially to blame were
overly optimistic estimates of useful life for confinement facilities.
Five to seven years is often the range, rather than 15 to 20 years
as predicted in the '70s.
The move to confinement was fueled by the capital-for-labor tradeoff.
Also, producers traded weather and predator risks for increased
financial risk. With the flip-flop of the '80s soaring
capital costs and falling labor costs many of these investments
in closed buildings turned sour.
The buildings also brought air-quality problems, which you know
about if you've spent much time in a confinement structure. Ammonia,
hydrogen sulfide, carbon monoxide and carbon dioxide gases often
are present at dangerously high levels, especially in farrowing
and nursery units, where producers spend most of their time
and small pigs are most susceptible to airborne health hazards.
Fortunately, there are healthy alternatives to confinement that
are just as profitable if not more so. Studies have shown
no major differences in gain and feed efficiency between environmentally
regulated and open-front housing in the Corn Belt. Pasture farrowing
is another example. Traditionally, this system has been viewed
as high-labor, low-cost and low-management. When coupled with
intensive management, it can be very profitable.
The bottom line is that pig production can net more dollars and
be more sustainable using systems that are not dependent on confinement.
Pasture-based operations are particularly well-suited for hilly
areas where ridge-tops and bottomlands can be intensively cropped
and marginal hillsides can support a corn-oats-alfalfa-hog pasture
rotation.
3. Manure
Hogs in Iowa produce about 33 billion to 39 billion pounds
of manure each year. Spread evenly over the state's 10 million
acres of corn, it would equal application of 100 pounds of 25-8-16
per acre, worth nearly $10 per acre. Assuming no losses, that
manure could supply one-quarter of the state's corn with 100 pounds
of N per acre.
The downside is that if manure is not stored, handled and applied
properly, its nutrients can be lost and, in turn, pollute the
air, surface water and groundwater. Confinement systems do make
manure easier to recover and control.
Managing manure well is a challenge, especially with its variable
dry matter and nutrient content. Application equipment limitations
are one bottleneck. In our Ag Systems Project in Newell, Iowa,
we were unable to adjust our spreader to apply fewer than 10 tons
per acre. The resulting applications supplied 200 pounds of N,
much more than was needed.
In the eastern part of the state, ISU Extension has set up a promising
solution: a manure brokerage system which allows livestock producers
with too much manure to apply their excess to fields on cash-grain
farms where it's needed.
4. Health And Genetics
The genetic base of U.S. swine is fairly narrow. Eight breeds
make up the majority of the population, with three or four breeds
predominating. Three Chinese breeds recently imported by researchers
at ISU, USDA and the University of Illinois show promise of broadening
genetic diversity to increase pig performance.
In confinement, genetic disease-resistance is critical. One-third
of all pigs had been affected by health problems in a survey by
the University of Missouri in 1978 and 1979. Scours, pneumonia,
salmonellosis, transmissible gastro-enteritis and influenza are
all familiar problems to most confinement hog producers. Interestingly,
pasture swine producers had the lowest health costs in the study.
Two controversial routes to swine profitabilty are subtherapeutic
antibiotic use and porcine somatotropin (PST)- swine growth hormone,
which is likely to be approved for use in the near future.
While there is no definitive conclusion on the human health effects
of routine low-dose antibiotic use in livestock, some in the scientific
community feel it's risky. Consumers will undoubtedly question
the safety of PST pork, just like they are currently resisting
BST-produced milk.
Instead of focusing on these additional inputs, perhaps more is
to be gained from an emphasis on management practices that prevent
disease and maintain herd health especially with consumer
concerns about food safety.
Already, many producers are actively working with veterinarians
to develop comprehensive health-care plans to reduce the need
for more expensive cures.
5. Animal Behavior And Management
Animal welfare is another hot topic in livestock production.
In Europe, gestation crates and sow tethering have been outlawed.
We haven't felt these effects here in the Corn Belt, but it looks
like only a matter of time before we do.
Certainly swine production could benefit from studying how to
use pigs'natural behavior to an advantage. An Ilinois study looked
at how pigs eat from a variety of commercial feeders. Based on
the results, researchers designed an improved feeder that better
fits hogs and reduces waste. A recent study at the University
of Illinois showed cloth strips and industrial hoses, suspended
over pens, as toys, lessen negative behaviors. Under way are follow-up
studies on whether toys effect feed conversion efficiency.
The shape of the perfect pig farm has yet to be found. In developing
more sustainable swine production systems, economic, environmental
and animal welfare concerns don't always seem to work together.
Compromise sometimes is necessary in designing whole-farm systems
with swine. The end result will be more sustainable, however,
when pigs' behavior, biology and ecology are central to the plan
and are not overridden by equipment, drugs or other constraints.
Mark Honeyman has
a doctorate in animal nutrition with a swine emphasis. He spent
four years farming using pasture farrowing He is coordinator of
the Iowa Agricultural Experiment Station's Outlying Research Centers,
and coordinator of animal sciences at Iowa State University. This
article is adapted from a paper he presented at the Leopold Center
for Sustainable Agriculture conference, "New Developments
in Cropping Systems and livestock Management Systems," Feb.
7, 1990.
Reproduced with permission of the publisher. The New Farm, Sept/Oct. 1990, p. 24-26.