Livestock

Profit loss from foot problems is so lame

Written by Dr. Jim White on .

Dairy herds can feed toward foot health


After mastitis, lameness is the most costly disorder of dairy cows. There are several factors that have an influence on hoof health, a few of which I'll explain below.

Producers tend to underestimate hoof health problems via lack of accurate records. Do you track loses on cows with hoof issues? Do your records show the extent of the problem? And, how you identify and define a lame cow? A too-strict definition won't make these losses go away. So for our purposes, is a 1-to-5 scale that comes in handy for finding where the herd stands.

For a score 1: The cow's top line remains flat or level while standing and walking; 3 out of 4 cows should be scored as 1.

A score 2: The cow's top line remains flat while standing and hunches up when walking. There should be less than one out of every six cows that are scored as 2. Score 2 cows will have slightly less dry matter intake than score one cows—say 99 percent as much as score 1
cows.

A score 3 cow has a hunched back when standing still and more pronounced hump when moving. A herd should have under 10 percent cows as score 3. Cows with a 3 score will have lower feed intake, and about 5 percent lower milk production than cows scoring as 1 or 2.

Cows that distinctly favor a foot are score 4, these cows will be 15 to 20 percent down on milk, and close to 10 percent down on feed
intake.

A score 5 cow is a severely limping cow, a cow that has limited interest in moving to the feed bunk or the parlor. These cows are often off a third of their milk, and 20 percent down on feed intake. Milk cows usually find a lameness score 5 to be lethal.

A leading cause of hoof problems is infectious agents or bacteria that can cause foot rot, hairy heel warts, etc.

Wisconsin researchers reported that 6 out of 10 cases of lameness were associated with infectious agents, 4 out of 10 cases are associated with laminitis—which is an inflammation of the foot. Laminitis changes blood flow to the hoof. One of the principal causes of laminitis is acidosis, where heavy grain feeding results in substantial production of lactic acid. This shifts rumen pH lower, which results in histamine increased after the death of gram-negative bacteria release endotoxin-causing blood pooling in the hoof claw.

Rumen protein degradation adds to the histamine load. Acidosis will result in breakdown in the bond between the epidermis of the hoof wall and soft tissue in the corium. It gives an increased incidence of sole ulcers and white line abscesses.

Of course, we can protect our herds from hoof problems through improving cow comfort, walking distances, walking surfaces, concrete exposure, heat stress, and exposure to frozen, slick surfaces, small rocks and yard wetness. And we can select genetics that boost sound foot and leg confirmation.
Feeding options to promote hoof health are as complicated as most "beneficial" rations.

Nutrients that seem to have little influence on hoof health are: salt, potassium, calcium, phosphorous, cobalt and magnesium. Rations do affect hoof health. Starch and sugar, the rapidly fermentable carbohydrates, are key factors leading to lower rumen pH and acidosis.

These carbohydrates can shift fermentation away from fiber digestion and increase levels of propionic and lactic acids. Finely ground, high-moisture grains or rapidly available sugars affect the rate of fermentation.

Sugars have the fastest rates of rumen fermentation. If you have a ration with a very fast fermentation rate of the fast-digesting feed, and a slow rate of the slow-digesting feed (which is common when we try to make up for low forage quality by bringing in a lot of grain), you're setting up the cows for acidosis. Expect Christmas presents from the hoof trimmer.

As a guideline, it is good to keep starch around 24 percent of the diet. Of course, it might move up or down from there by a couple of points. Sugar will usually be 2 to 4 percent of the diet DM.
Protein quality, protein solubility and protein degradability can influence lameness. As mentioned earlier, protein breakdown can lead to histamines.

Adequate effective fiber maintains a rumen forage mat, reduces the likelihood of laminitis, helps maintain butterfat percent and encourages cud chewing or rumination. There are a couple of general rules for effective fiber: maintain NDF and have at least 5 pounds a day of fiber over an inch of length. If butterfat is fine, the cows are getting bred and feet are good, effective fiber is adequate.

Fat does not ferment, it will not produce lactic acid. Overfeeding occurs sooner with oils than with animal fat, reducing fiber digestion. This reduction in fiber digestion tends to swing rumen pH lower. Not feeding more than a pound of additional fat is a good place to stop
with feeding fat.

Copper has some effect. We tend to get greedy on feeding copper, except to Jerseys, and especially when we are feeding fescue. Copper-short animals are more susceptible to heel cracks, foot rot and sole abscesses. Zinc, especially protected-chelated zinc, such as that used in MFA dairy feeds has been shown to improve hoof integrity, wound healing, epithelium maintenance and keratin synthesis.

Additionally it has been shown to be associated with lower somatic cell counts.

Classically it was argued that adult ruminants did not need, require, nor like water-soluble vitamins added to their feed. Research and field work has shown instances where ruminants have responded to niacin, biotin and B12. Biotin is requisite for keratin formation and claw horn development. University work on lame cows has reported that cows fed biotin will improve their lameness score by about one when fed 20 mg of biotin a day. The response to feeding biotin is not immediate, plan on doing it at least six weeks before seeing a response. Seeing a response in 6 months is more likely. Likewise, if you are feeding biotin, and pull it, the milk nor hoof health response is immediate.

Dr. Jim White is ruminant nutritionist for MFA Incorporated.

Scold the mold and ventilate

Written by Dr. Jim White on .

 

MFA TECHNICAL BRIEF

Challenging hay conditions will affect feeding efficacy and safety

We had some interesting hay-making conditions this year. There was plenty of hay down during summer pop-up thunderstorms or more prolonged rain events, and, as always, there was plenty of humidity regardless if it rained or not. Fall cuttings weren't much different. Such conditions are the beginning of many undesirable things: reduced subsequent forage growth, loss of nutrients, mold growth, increased harvesting loss, increased harvesting costs, hay being put up at a higher moisture, heat damaged protein, brown spots, barn fires, etc. 

Given high humidity, expected forage drying in storage may not occur and the hay may have high enough moisture to permit mold growth.  On untreated hay (hay that is untreated with mold killers such as propionic acid, ammonia, sorbic acid/salts, etc.) mold will grow at moisture levels above 14 percent to 15 percent. The PhD forage geeks will wring their hands and remind us that the measurement should really be water activity rather than moisture. But measuring "water activity" is a tedious and hard-to-arrive-at-in-the-real-world formula. Moisture is easier to measure and is close enough to let you make management decisions. 

Mold growth produces heat and can result in large amounts of organic matter loss. Under some conditions mineral can be lost-leaching out potassium is common.

In some situations heating can be great enough to cause auto-oxidation, "charring" or spontaneous combustion leading to full-fledged hay fires. By rights, hay burns somewhere around 350F. But if you see what looks like steam, which is water vapor coming off the center of bales, you need to take immediate action. If you have a thermocouple or thermometer that pegs a temperature of no greater than 130F, the temperature will drop. If it hits 150F, the hay temperature may go down, which is good, or it may go up, which will be troublesome. If the temperature is greater than 175F, take immediate action. Here, immediate action means call the fire department. Then you call me and ask about carrying cows through winter on a low hay inventory.

Drying of stored hay is increased by: 

1. Ventilation: Having air space between bales increases air movement.

2. Adequate head space: Providing enough gap between the top of the stack and the roof allows moisture to move up and out the top of the stack.

3. Avoiding other wet products in the same area: In areas of low air circulation, additional wet material raises the humidity of the storage area.

4. Having smaller stacks.

5. Using alternating direction of stacked bales.

6. Avoiding use of tarps: Tarps on the top of a hay stack trap moisture via condensation and supports the growth of mold. 

Molds commonly found in hay include Alternaria, Aspergillus, Cladosporum, Fusarium, Mucor, Penicillium, and Rhizopus. In hay, mold growth-structures are comprised of two components: mycelium and spores. Mycelium is the stringy growth structure of fungi. It looks sort of like the strands of a cotton ball. Spores are the reproductive, seed-like structure. A principal concern for cattle is the total amount of mycelium and spores combined or the total "fungal biomass." In hay, the white mold in the bale is the mycelium and dustiness is from the tiny spores. These mold-produced spores are the "dust." They can cause respiratory problems, especially in horses or other animals fed in poorly ventilated areas. The physical dust problem associated with moldy forage can be reduced by ensiling, mixing with a high moisture feed or wetting the hay. 

Most molds are harmless; they don't produce known mycotoxins. But the fungi did use some forage energy-it is lost for livestock purposes. Under some conditions, Aspergillus, Fusarium and Penicillium will produce mycotoxins. Many of the commonly diagnosed mycotoxins are produced in the field prior to harvest. Here in the humid Midwest, we are well-acquainted with infected fescue. In harvested or stockpiled infected fescue, the toxic alkaloid concentration will decline over time. There is substantial discussion about mycotoxins in forages because several species and or mycotoxins may be present. Try as we might, control methods are not consistent nor are the diagnostic methods. Same goes for treatment recommendations. More research is needed. 

Livestock sensitivity

Feeding moldy hay to livestock is a frustration. The effect of mold on livestock health can vary depending on the type of livestock and fungi. Horses seem to be most sensitive to mold. Mold spores exacerbate respiratory conditions such as heaves and digestive problems like colic. Cattle can generally tolerate and eat a mold on hay without problems. Canadian work on molded hay showed limited reductions in digestibility and intake of molded hay, even up to as high as 10 percent fungal biomass in the hay. Hay harvested and stored under ideal conditions often contains 1 to 2 percent total fungal biomass while severely molded hay may contain up to 10 to 12 percent total fungal biomass. 

The researchers concluded, "Presence of fungal biomass in alfalfa hay does not affect the rate and extent of DM, CP, and NDF degradation of feedstuffs commonly used in ruminant rations but may affect rate and extent of DM degradation of highly lignified feedstuffs such as barley straw." To avoid livestock problems, the conservative approach is to minimize feeding hay to more sensitive livestock.

The interpretation of spore counts which have been suggested are:

< 500,000 per gram: low risk 

500,000 to 1 million: relatively safe

1 million to 3 million: feed with

circumspection

3-5 million, dilute: feed with caution

> 5 million: do not feed

(Richard et al 1993)

Dr. Jim White is ruminant nutritionist for MFA Incorporated.

Grazing rice as a small grain

on .

Will it work? I'm trying to find out

I have been known to do egregious things. One I did recently was to mention Sericea lespedeza and not follow with how much Remedy to use to kill it. So let me clarify. Good Sericea lespedeza is dead Sericea Lespedeza.
Now that I have offended nearly everyone, except perhaps the Missouri highway department that introduced Sericea, I am pursuing another agronomic adventure.

I am trying to find information on grazing rice as a late-summer annual pasture. I was speaking with a Missouri cattle raiser who is looking at using rice as a pasture crop, seeding it down like any other small grain crop and grazing it as we would rye or wheat. The interest in rice is acute in that it has a growth habit that covers a part of the year when we tend to be forage short-the mid- to late-summer time of year.

When I look through the literature, I find data on feeding rice straw. Usually the reports are from Asia, and draft animals are fed the rice straw (people eat the grain). To the American ruminant nutritionist, this can be an emotional hurdle. I overcame it some years ago in Central America. I was looking at some skinny lop-eared milk cows. The farm manager solicited my opinion. I was the wise guy from the States. Trying to make a point, I said, "Hey! Do you know what corn is?"

The farm manager said, "Of course, we eat corn, all the tortillas on this morning's table were from slaked corn, and your point is?"

So, I said, "I, uh... I guess we won't be feeding corn to the cows; they get the stalks, cobs and husks, right?"
Rice straw is tough stuff, notorious for silica, it dulls knives about like chopping sand. It has fiber levels as high as cottonseed hulls.

Years ago I scrounged around looking for rice forage, because some high end Waggie recip cows were supposed to be fed rice straw and barley. I wanted to feed the cows Iowa brand corn silage, but the honorable Japanese owners wanted to feed the cattle rice forage, and since the honorable Japanese were paying the bills, we went to Arkansas for rice forage.

This was a tremendous experience. Most of the rice straw was plowed under, and the rest, which was baled, was most frequently used for erosion control. We did find some unheaded material that was baled, and it did not feed too bad-much better than straw would have.

For rice straw, figure these averages: about 60 to 65 percent neutral detergent fiber (of which 30 percent is digestible); 40 to 45 percent acid detergent fiber and 5 percent crude protein-roughly similar to corn stalks, although corn stover NDF will tend to be of higher digestibility than 30 percent. Given that whole-plant corn silage can have substantially more energy and protein than the subsequent corn stover, I would expect that younger rice plants have substantially higher nutrient content than rice straw. A research team from Korea, lead by Ki et al, in the April 2009 issue of Asian-Australasian Journal of Animal Sciences, reported that whole-plant rice silage could be used to replace corn silage in milking cow diets without reducing milk production. Ishida and the Korean Rural Development Administration have also done work on using whole-plant rice silage for dairy feed. I would suspect if a forage can be used as dairy feed, it would certainly be a beef feed alternative.
I would expect that higher protein content would tend to improve digestibility, as would lower silica contents. UC Davis did work across a wide variety of rice cultivars and the California work did not show a correlation between silica concentration and digestibility. This is encouraging in that the silica might not be directly reducing the digestibility.

When I went and asked colleagues about grazing rice, the most common response was, "I have no idea." Other common responses told me that rice is a grain crop-and one of the most costly crops to establish. It is too costly for cow feed with the exception of the by-products: bran, mill feed and hulls.

Agronomists I talked to were particularly concerned with the amount of silica. Rice may have a silica requirement, but cows do not. A clever emeritus professor said that it should work, but doubted the likelihood of getting funding for such a project.

So, at this juncture, I am soliciting the experience or advice of anyone who has tried grazing ruminants on rice as we would graze other small grains such as wheat, rye, barley, oats or triticale.
I'd be grateful for any insight or suggestions. Write to me at This email address is being protected from spambots. You need JavaScript enabled to view it..

Dr. Jim White is ruminant nutritionist for MFA Incorporated.

Modernizing feed mills

Written by stevefairchild on .

robot stacker


Feed and Grain, a business-to-business magazine that covers the feed market has a nice feature on the updates and upgrades MFA has installed in the Mexico, Mo. feed mill. The story explains how a new bagging system and robot bag stacker has increased throughput for the facility and helped to reduce working injury.

MFA’s new bagging system delivered on the promise of a 33% reduction in the overall plant labor/labor efficiency gains; the 50% reduction in overall shrink, the loss related to packaging; and a 20% increased throughput rate.

“Technology enhances your competitiveness. As other costs tend to go up, you need to find ways to minimize expenses where you can and improve efficiencies,” says Alan Wessler, vice president of MFA’s feed division.

 

Read the whole thing here.

Herdsman is on the way

Written by stevefairchild on .

Here is a behind-the-scenes look at a new offering that's on the way at your local MFA location. A couple times per year, MFA retail managers bring agricultrual vendors into a trade-show setting. Managers from across MFA's territory gather to work with the vendors to attain volume pricing and other forms of buyer savings. Those products then work through the cooperative to your farm. herdsman booth

At the August Buyers' Market, the Herdsman brand made its debut to MFA. Herdsman is a joint venture among several cooperatives who pool their buying power to get high-quality farm supply products at a reasonable price. Herdsman fencing products are first to hit the MFA system.

The Herdsman brand was conceived by farm product buyers at Tennessee Farmers. Participating cooperatives include: Tennessee Farmers, Alabama Farmers, MFA Incorporated, Heritage Trading and Intermountain Farmers Association. As buyers from these cooperatives negotiate deals with manufacturers, more Herdsman products will be available.


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