APRIL 2011 NEWSLETTER

Farm First Newsletter
April 2011Heifer RearingSome of you attended the dairy heifer rearing talk by Sam Leadley an American heifer rearing expert, at the end of February. For those who were unable to attend, here’s a summary of the main points:
• Aim to give at least 6 pints(3.4litres) of colostrum in the first 6 hours of life, this may mean milking the cow and stomach tubing the calf to ensure adequate intake. Disease in baby calves is almost always associated with inadequate colostrum intake.
• To ensure adequate colostrum intake in a suckling calf ‘educate your fingers’. Palpate the abdomen of a newborn calf before it has had a chance to suckle. Stomach tube with a known quantity of milk e.g. 3 litres, then re-palpate. Now you know what a calf feels like with 3 litres of milk inside. Repeat with a few calves until you have achieved confidence in what you’re feeling.
• Ideally 2nd >4th milkings should also be fed to calf as this provides continued protection through the provision of antibodies(and its higher in solids)
• If freezing colostrum, it should be frozen in 1 litre amounts in 4 litre freezer bags laid flat(sheets of colostrum form), and defrosted in hot(not boiling) water. Microwaves should not be used as they will destroy the antibodies.
• Keep things clean, especially buckets. You should be willing to drink from the same bucket as the calf
• Feed milk when still warm, ideally within 30 minutes of milking. Leave longer and the bacteria in the milk will start to multiply as the milk cools.
• It’s important to monitor growth in baby calves, a newborn 45kg calf should double its weight by 2 months of age. A cheap way to monitor this is using a weigh band.
• Takes 3 weeks from the start of feeding solid food for the rumen to adapt sufficiently to allow the calf to survive. Grain (concentrate) and water are essential to promote this adjustment.
• Calves which have grown well during the first 2 years of life and have hit target weight at calving , will produce more milk in the first and second lactation; poorly grown animals will not reach full potential in terms of yield until third lactation and will also be more difficult .
• With youngstock, don’t change feeds abruptly, especially forages. Giving each animal a big handful of the new forage daily for 5-7 days prior to the change, will allow the rumen time to adjust.
• Bull heifers at 55% of the weight of the average 3rd/4th lactation cows in the herd. Heifers should to calve down at 85% of the weight.
Please contact us if you’d like a copy of Rob’s more in depth notes.
Hoof Disorders
A recent article in the “Veterinary Record” has shown a link between the infectious agents (treponemes) which lead to digital dermatitis and non-healing hoof disorders, namely: toe necrosis, white line disease, and sole ulcers. Both vets and foot trimmers have reported a significant rise in the number of these non-healing lesions in the past 10 years. Given the likelihood that it is the same organisms causing non-healing lesions as those that cause digital dermatitis, it means that an even greater effort emphasis is needed to reduce the incidence of digital dermatitis on farm, i.e. regular footbathing, regular scraping of passages and prompt treatment of clinical cases etc.
Some of our clients have switched to footbathing with Kling-On Blue for digital dermatitis, and so far the results have been encouraging. One of the major advantages of this product is that the cows only need to be put through the bath once a week for 8 weeks, and then once a fortnight. A pressure washer is required to mix up the solution in a 200 litre drum. A 20kg bag costs £88.35 + VAT makes enough solution for a 200 litre footbath, which will treat 100 cows. There are discounts on purchases of larger amounts. For more information, please contact us at the office.
Sheep Abortion
Intervet Schering Plough will again be funding blood checks for aborting ewes. Ewes can be blood sampled up to 3 months post lambing to test for the two most common causes of sheep abortion: toxoplasma and chlamydophila (enzootic). Ideally 6-8 aborting ewes should be identified, which can then be sampled at the end of the lambing period. The cost for this without Intervet’s subsidy would be about £70
Scabivax(Orf)Vaccine
It looks like there will be no further supplies of Scabivax available for the foreseeable future. This could be a big issue for those of you that have orf problems on your farms. There is no alternative vaccine. In the face of an outbreak management of the infected animals plays an important role. Stocking density should be reduced as much as possible(especially in housed situations) and separation of affected and non-affected sheep should be considered(whether ewes at lambing time or older lambs) This will help reduce the spread of the disease. Affected lambs or lambs from badly affected ewes may have to be fed artificially(paying particular attention to hygiene of teats/bottles etc). Ewes with severely affected teats can be dried of early and the appropriate intramammary antibiotic therapy instituted to prevent secondary mastitis.
Orf is a virus, so is not killed by antibiotics. Antibiotics can be used to control secondary infection. Repeated high doses of an antibiotic like Betamox LA is probably best(and is thought to work slightly better than Alamycin LA). Painkillers such as Flunixin or Metacam could also be used in severe cases. Antibiotic or antiseptic sprays can be sprayed onto the lesions.
Remember the orf infection usually runs its course in about a month.
E mail Addresses
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Farm First Beef and Sheep Farmer Talks
Please add these dates to your diary.
Jane will be doing a talk on ‘Tackling lameness in the Sheep Flock’ on at 7.30pm Wednesday April 20th at the King of Prussia.
Rob is going to give a talk on ‘Improving the Fertility of Your Beef Suckler Herd’ at 7.30pm on Wednesday May 4th at the King of Prussia.
Ring and speak to Tracy in the office to book your places