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November 4, 2020 News

Dr. Mykolas Kamaitis

Whether or not this recent weather has caught you a bit underprepared for the cold months ahead, it is still not too late to get the farm ready for winter. The homestead or hobby farm shares many of the same winter challenges as large-scale farming operations, as well as some that are more unique to the homesteader.  Although this article will not go into the nitty-gritty details of winter prep, it will highlight some key considerations regarding your livestock as we head into winter.  For specifics on preparing your bees and poultry for winter, please visit our website at www.uppergrandvets.ca to check out our September and October newsletters.

During the spring and summer months it can be easy to expand your operation – not only is it the time of year most of us small farmers acquire broilers, turkeys, ducks, and hogs to grow out for late summer/autumn harvest, but the green pastures, flowing water and beautiful weather seem to make it easier to justify increasing the number of livestock on the farm.  If, like me, you find yourself heading into winter with a few too many animals and not quite enough space to house everyone during the cold months, it is certainly time to downsize.

Shelter: The first thing to consider is whether you have the space to house your animals over winter.  Most of our traditional livestock species tolerate Ontario winters quite well if they have an enclosed, well ventilated space to get out of the wind, wet and cold.  There are many great resources online on species-specific requirements for floor space and supplemental heat (etc.) or you can always consult the UGVS veterinary team!  Additional strategies like deep bedding with straw greatly improve animal health and comfort.

If you don’t have the space to accommodate your livestock over winter, you’ll either have to add housing and infrastructure or unload some of your animals by selling them live (sale barn, online, word of mouth, etc) or sending them to the processing plant.  Even though it may be tempting, do not overcrowd a coop or barn as this increases the risk of disease in your remaining animals.  Sometimes sending an older animal to slaughter is difficult for sentimental, logistical, or culinary reasons (old animals, particularly males tend to produce tougher meat).  If your hesitation is culinary in nature, processing meat as ground works great – I recently made some amazing duck burgers with ground meat from my older Muscovy drakes.

Feed & Water: You also need to plan for watering and feeding your animals.  Do you have ice-free water sources?  Will it be feasible/practical to water your animals throughout the winter?  Where will you be storing feed and how easy will it be to bring it to your animals as needed?  Ensure you can provide ample high-quality feed throughout the winter. Your animals’ increased energy demands during cold weather mean that adequate nutrition is critical.

Production Goals: You should also consider your production goals throughout the winter. Is your focus to just keep your animals alive through the winter or are you hoping to achieve some productivity (eg. weight gain, production of offspring, eggs, milk, etc).  If you are hoping to get some production out of your animals, ensure you read up on specific requirements.  In the case of egg production in chickens for example, providing supplemental lighting to extend “day length” is key to maintaining a steady egg supply during the darker months.  Sometimes providing basic feed and water is not enough to get what you want out of your animals.

If you have specific questions or concerns heading into winter on the farm, we are happy to discuss and help you develop a strategy for managing your livestock throughout the winter!

If you have any questions on these or other topics, please do not hesitate to contact one of our Veterinarians.


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November 4, 2020 News

Dr. Shannon Walsh

A Brief Review: Most dairy producers are well familiar with clinical hypocalcemia (milk fever), which looks something like this… A cow is close to calving > calcium demand skyrockets as the cow prepares for colostrum and milk production > at the same time, her dry matter intake drops (=less dietary calcium) > she begins to breakdown bone to release calcium (bone is restored later in lactation) BUT may not be able to do so efficiently (e.g. poor transition diet) or sufficiently (e.g. older, high-producing cows) > calcium is required for muscle function, leading to various symptoms:

  • Cardiac muscle  > weaker heart contractions, poor circulation > cold ears, etc.
  • Smooth muscle 
    • Gastrointestinal tract  rumen stasis, constipation, ↑risk of ketosis, DA
    • Reproductive tract > ↑risk of difficult calving and retained placenta
  • Skeletal muscle > muscle tremors, wobbly gait, inability to rise

Avoid giving oral calcium boluses to down milk fever cows – the smooth muscle in their esophagus is weak creating a choking hazard.

Calcium is given intravenously and/or subcutaneously and the cow responds well.  If 10-15% of cows are affected by milk fever annually, this indicates a herd-level issue and warrants further investigation – e.g. review your dry cow ration with your nutritionist and consult your vet on other preventative strategies.

“Tell Me Something I Don’t Know”The Finer Points…

  1. Why isn’t my down cow responding to calcium?
  2. Can mid-lactation cows be hypocalcemic?
  3. What is subclinical hypocalcemia?
  4. Are all oral calcium boluses the same?

1) Why Isn’t my Down Cow Responding to Calcium?

  1. a) There may be other mineral deficiencies involved besides Calcium (Ca)… (diagnosed by blood test)

Phosphorus (P): Bone is made of Ca, P, and a protein matrix. As bone is broken down to release Ca, P is similarly released and lost from the body via the udder.  P is a component of cell membranes and when deficient, muscles and blood vessels are more easily damaged.  While P-levels tend to restore themselves after Ca is provided, research has shown that including it in down cow therapy can increase success.

Magnesium (Mg) & Vitamin D: Both are involved in complex pathways that regulate blood calcium.  Low levels of Mg and VitD are not directly related to milk fever but rather prevent the cow from efficiently releasing stored Ca from bone, reducing the loss of Ca in urine, and absorbing dietary Ca.  Deficiencies in Mg & VitD are uncommon.

Did you know…?
The phosphorus in “Cal-Plus” (blue-top) are ‘phosphites’ which are NOT biologically available to the cow.  Enemas or *oral phosphorus boluses* contain biologically available ‘phosphates’ (*new*).

Do NOT mix phosphorus enemas with calcium solutions (e.g. Cal-Plus, Cal-Boro). The phosphorus (phosphate) and calcium will bind and precipitate out of solution, rendering the treatment useless and causing stress on the cow’s kidneys.

Potassium (K): Unrelated to milk fever but involved in muscle contraction, low K can result in muscle weakness.  A mild K deficiency is common in cows off feed, but we don’t typically observe K-levels low enough to see symptoms or warrant treatment.

b) She may also have an injury… 

Due to her weakened or uncoordinated state a hypocalcemic cow may injure herself when she initially goes down or during her attempts to rise – e.g. soft tissue injuries, dislocations, or fractures.

A pelvic nerve injury from a difficult calving or delivery of a large calf may also cause or exacerbate hind end weakness and paralysis.  Additionally, if the cow has been down for more than 24hrs, the pressure of her body weight prevents adequate circulation of oxygen to her muscles and nerves resulting in permanent damage (a.k.a. compartment syndrome or downer cow syndrome).  Likelihood of recovery from ‘downer cow syndrome’ may be gauged with a blood test that measure enzymes (proteins) that are released from damaged muscle cells.

c) She may have an additional illness… There is a correlation between the presence of bacterial toxins in the blood and low blood calcium.  While the underlying mechanism is beyond the scope of this article (and under some academic debate), a cow affected by toxic mastitis, metritis, or enteritis (gastrointestinal infection) will also often be low in calcium.  In these cases, calcium may be given as a supportive therapy, but treating her infection is critical.

Milk fever is one of the most studied and most complicated diseases in dairy cattle. The condition has been under study for >200 years, and while there has been tremendous progress in our understanding of this condition, there are still gaps in our knowledge.

2) Can Mid-lactation Down Cows be Hypocalcemic? > Yes. For example,

  • Toxemia-associated hypocalcemia: described above.
  • Estrus-associated hypocalcemia: high levels of estrogen following a strong heat can interfere with the release of calcium stores from bone.
  • Breed-predisposition: atypical cases of hypocalcemia are more common in Jerseys.

3) What is Subclinical Hypocalcemia (SCH)?

  • Blood calcium levels are below normal, but not sufficiently low to cause muscle weakness/down cows
  • Unlike clinical hypocalcemia, it is common and as likely in heifers as in older lactations
  • May be transient (<3 days) or chronic (>3 days). Impacts may include the following (more research needed):
    • Transient SCH – reduced pregnancy rate at first service
    • Chronic SCH – higher SCC and lower milk components in early lactation, increased risk of transition cow diseases (retained placenta, mastitis, ketosis, etc.), slower return to cyclicity and reduced pregnancy rate at first service

Prevention is achieved by use of oral calcium boluses at freshening – either as 1) blanket therapy to all Lactation 2+ cows, or 2) selectively to lame and high-producing cows.

4) Are All Oral Calcium Boluses the Same? > No.     Note: At Upper Grand Vets, we do not promote one manufacturer over another.  Rather, we offer products that balance economic value with evidence-based medicine.  Although oral calcium boluses from different manufacturers are generally similar, we recommend verifying that the product you use meets the following criteria:

  • Contains calcium in two forms: rapid-release (e.g. calcium chloride) and longer-release (e.g. calcium sulfate)
  • Lists a protective coating (often xanthan gum) that protects the esophagus from irritation (calcium is caustic)
  • Caution: Do not use broken boluses, as the protective coating has been compromised. Most manufacturers will replace these at no charge.

If you have any questions on these or other topics, please do not hesitate to contact one of our Veterinarians.



October 7, 2020 2020 Newsletters

With autumn upon us, it is time to prepare your poultry for winter. Chickens (as well as turkeys, ducks, and geese) can generally handle Ontario’s winters quite well, but there are some important considerations and steps to take leading into the cold months of the year.

  • Ensure your chickens have appropriate housing and it is prepared for winter
    • Chickens are tolerant of the cold if they are kept dry, away from drafts, and given a space to roost together off the ground.
    • Provide deep bedding for your chickens to help keep them warm and dry.
    • A heat source (heat lamp or space heater) can be provided, especially during very cold snaps. This is a topic of debate, and some prefer to go without it. In some cases, the extra heat can be beneficial – contact your veterinarian if you have questions about what is best for your situation.
    • Insulate your coop – it will help keep in the heat generated by your chickens and/or your heat source
    • Close off windows and limit the size of any doors or openings used by the chickens to minimize heat loss. If you have been using a full-sized door to let your chickens outside during the summer, consider installing a small door in the wall of your coop or adding a pet door to your existing door.
    • Ventilation is very important! Ensure your coop is ventilated to maintain adequate air quality and decrease moisture in the coop, both of which are important for the health of your chickens.
  • Access to feed and water
    • Provide access to high-quality feed – this is especially important in the winter when a lot of the energy chickens consume will be used to keep themselves warm.
    • Always keep excess feed on hand should bad weather or road conditions prevent you from getting to the feed store – you don’t want to run out of feed and have the chickens go hungry on a cold day.
    • Make things easier on yourself and try to store feed in a waterproof container near the chicken coop so that you’re not having to carry bags of feed a long-distance during bad winter weather.
    • Ensure there is a clean water source free of ice – you can purchase heated waterers or use a heating block or pad to keep their water from freezing. There are also a number of different designs and strategies available online to keep your waterers ice-free, just make sure to prevent any risk of fire or overheating.
  • Know your chickens
    • Certain breeds and traits are more tolerant of cold weather. In general, chickens of smaller size and those with larger combs and wattles are more susceptible to chilling and frostbite.
    • If you are concerned about your chickens’ combs becoming frostbitten, you can apply petroleum jelly regularly to help protect them from the cold
    • Avoid keeping only one or two chickens over winter if possible – chickens will huddle together for warmth so having a few more birds will help keep the group collectively warmer.
    • Unless you provide supplemental lighting, your chickens will likely drop in egg production during the winter months. If you would like to keep production up, supply your chickens with a light source to extend their “daylight” up to 16-17 hours.
  • Daily routines
    • Give yourself some extra time for daily chores to ensure waterers aren’t frozen, feeders are topped up, all of your chickens look healthy and well, and to collect eggs in a timely manner (the can freeze and crack on you if left out in the cold!).

As always, if you would like more information on how to prepare your chickens for winter or have any other poultry health questions, we are happy to help!

Dr. Mykolas Kamaitis

If you have any questions on these or other topics, please do not hesitate to contact one of our Veterinarians.


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October 7, 2020 2020 Newsletters
Preg Check Time is a frustrating time to learn that your bull is subfertile or infertile. Rather, have a semen test performed on your bull(s) prior to the breeding season.

Fall processing is right around the corner!  It is an exciting time to appreciate the progress your spring-born calves have made! And of course, an integral part of fall processing is pregnancy diagnosis. There is time and expense associated with moving cattle through the chute and having them checked, so I think it makes sense to take the opportunity to pause and reflect on why we recommend the practice. What do we gain by performing preg checks?

Measures reproductive health in the herd and flags problems early

  • Low conception? consider bull infertility, cow infertility (infectious?), and nutrition issues
  • Broad range of gestational stages? consider infectious causes of early embryonic death/early return to heat, whether too many poor breeders are being kept rather than culled, if the bull might have low libido/chronic lameness/other issue, and if too few bulls

Improves farm profitability and helps to guide management decisions

  • Culling of open females permits efficient use of farm resources – especially feed and bedding over winter
  • Confirmation of reproductive status (preg/open) and fetal sex may be valuable for marketing purposes
  • Allows identification and selling of late-calvers to improve calf crop uniformity
  • Provides the opportunity to create different calving groups (early/late) for more intensive calving supervision
If facility limitations have previously prevented you from taking advantage of this service, please do not hesitate to ask us about our mobile chute and gate system!

– Dr. Shannon Walsh

If you have any questions on these or other topics, please do not hesitate to contact one of our Veterinarians.



October 7, 2020 2020 Newsletters

Often referred to as a ‘twist’, a displaced abomasum (DA) is an expensive event on the farm.  Associated costs include:

  1. Loss of milk production – 700-1200lb less milk produced in the lactation
  2. Veterinary costs – surgery, medicine
  3. Replacement costs – due to increased risk of culling or death

What causes a DA?

DAs is a multifactorial disorder, at times with a complex web of contributing factors – some of which I have listed below. I find it helps to think about risk factors and associated management practices within the following formula:

↑Space in Abdomen + Motility & ↑ Gas in Abomasum = ↑ Risk of DA

Risk factors associated with an increase in abdominal space 

  • Deeper barrel conformation of modern cows
  • Calving (i.e. loss of calf weight, placenta, and fluids)
  • Reduced dry matter intake and rumen fill
    • Calving time (i.e. natural drop in dry matter intake)
    • Concurrent disease-causing inappetence, e.g. metritis, mastitis, pneumonia…
    • Ration issue, e.g. wet silage, palatability, high energy/low fibre, mixing errors
    • Bunk issue, e.g. competition, infrequent push-ups, limit feeding
    • Cow comfort, e.g. stall design, ventilation, heat abatement
    • Social stress, e.g. pen movements in the transition period

Risk factors associated with low abomasum motility and excessive gas accumulation

  • Hypocalcemia (i.e. calcium required for contraction of all muscle types), e.g. dry cow nutrition, parity (lactation #), genetic predisposition
  • High rumen volatile fatty acids (VFAs), e.g. high energy/low fiber ration, sorting
  • Ketosis (low glucose and insulin lead to reduced abomasum motility), e.g. over-conditioned cows at freshening (body condition score >4), dry cow nutrition

How do I reduce the risk of a DA in my herd? 

It is not realistic to expect the elimination of DAs, but rather a target of <4% annually is achievable. Review your farm protocols and engage your vet and nutritionist farm advisors on the following subjects:

  • Monitoring, preventing and treating fresh cow illnesses
  • Nutrition management
      • Ration formulation for optimal dry matter intake and suitable fibre/energy levels
      • Critical control points for delivery of a consistent and appropriately processed ration
  • Regular dry matter testing
    • Ensuring feed changes are gradual and are preceded by forage testing and ration formulation

Facility and cow comfort strengths and opportunities – e.g. stall design, social groupings, bunk competition

Dr. Shannon Walsh

If you have any questions on these or other topics, please do not hesitate to contact one of our Veterinarians.



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