Best practice recommendations regarding entrance control

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Every person entering the farm, including the farmer and his/her staff, should take precautionary measures, as they can carry pathogens onto the farm. All unnecessary visitors should be kept out of the stables and away from the animals. Visitors should adhere to the following measures: 

  1. Park your vehicle as far as possible from the animal housing facilities, on the dedicated parking area. When there is no parking area, leave your vehicle on the public road. 
  2. Never enter the animal housing facilities without informing the farmer/responsible person. 
  3. Before entering the animal facilities:
    • Sign the visitors’ register.  
    • Remove your footwear and overclothing.  
    • Wash and disinfect your hands and/or wear disposable gloves.  
    • Proceed to the clean zone of the hygiene lock (the side where the animals are present). Showering may be obligatory.  
    • Put on farm-specific and clean coveralls/clothing and footwear. Whenever a farm does not have specific clothing or footwear, put on a disposable coverall and overshoes.  
  1. While being in the animal housing facilities, do not touch animals unless necessary.
  2. Ideally, between different houses or animal groups, you should change clothing and footwear andwash and disinfect your hands.
  3. At the end of your farm visit: 
    • Remove farm-specific footwear and clean it before placing it back.  
    • Remove farm-specific clothing and put it into a laundry bin. 
    • Enter the dirty part of the hygiene lock (you may have to shower first).  
    • Wash and disinfect your hands.  
    • Put your own clothes and shoes back on.  

Whenever these measures are followed thoroughly, no additional animal-free contact period is required. However, this can still be imposed by the farmer/government. 

Paratuberculosis control requires a national plan

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Managing Sick Animals > Diagnostics > Resource > Paratuberculosis control requires a national plan

 

Paratuberculosis is a chronic, contagious bacterial disease (caused by Mycobacterium avium subsp. Paratuberculosis (MAP)) of the intestinal tract which primarily affects sheep and cattle, goats, and other ruminant species. There is no known treatment for the disease. Control involves good sanitation and management practices including screening tests for new animals to identify and eliminate infected animals and ongoing surveillance of adult animals.

Implementation of regional/national control programmes are successful. They are related to growing industry concerns about the zoonotic potential of MAP, the desire to be proactive in control at both the farmer and processor levels, and/or to meet trade requirements. The interest among processors serves to take a voluntary control and/or status programme and make it mandatory for farmers.

The primary tools used for control across countries range widely, from testing options, on-farm risk assessments, incentive programmes, education and awareness campaigns and vaccination. Successful countries recommend some form of testing; faecal culture or PCR of environmental samples, bulk tank milk ELISA tests, or the use of similar methods at the cow-level. More recent developments and variations exist in the use of a combination of tests (e.g. ELISA followed by direct faecal PCR for confirmation) and/or cut-off values (e.g. test label vs. cut-off for high shedding animals). Many nations supplement these testing schemes with the recommendation to complete a herd-level risk assessment, which can be either specific to the disease or part of general biosecurity risk assessments.

The 7 important and individual steps in the optimal cleaning and disinfection protocol for livestock barns 

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Cleaning and disinfection (C&D) of livestock barns between production cycles is crucial in achieving a good farm biosecurity. Optimal C&D takes 7 individual steps that need to be executed chronologically!

  1. Start with dry cleaning the barn to remove coarse manure, emptying feeders and waterlines, and removing finer dirt . The less organic material remains, the more efficient the C&D will be, saving product, water and time.
  2. In step 2 the barn is soaked first only with water and next with water and detergent for better dissolving of fats and dirt. Foam is to be preferred for its longer contact time, better visibility and effectiveness. Foam the barn from floor to ceiling upwards for longer contact time. Leave enough time for the foam to work on the dirt before the next step of rinsing with a high pressure washer between 50 and 120 bar.
  3. Rinse the barn from ceiling to floor downwards to prevent recontamination of the cleaned upper surfaces.
  4. Next, very important is step 4: drying before disinfection. Make sure to clear feeders and drinking cups from rinsing water and dry the floor. It is crucial to prevent dissolution of the disinfection product to ensure its efficacy!
  5. Disinfection in step 5 can be done in various ways: wet, thermal disinfection, foam, fumigation or combinations. Also all loose material, central corridors, technical and office rooms, clothing and footwear need C&D.
  6. Step 6 is drying of the disinfection solution. Rinse the animal feeders and drinkers to prevent the incoming animals to ingest any disinfection product.
  7. The last step, whilst very important is often overlooked: testing the efficacy of your C&D protocol which should not be limited to visual inspection but ideally involves taking bacteriological swabs to assess the pathogen load in the barn.

Buying a sheep without health hazards

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Firstly, one should avoid buying small batches of animals from different origins. Quarantine is always recommended when introducing new animals. It may not prevent all risks, but it can prevent the introduction of diseases such as scabies or footrot.

Indeed, scabies carriers can appear perfectly healthy on arrival if they are still in the incubation phase. To counteract this risk, some administer a suitable antiparasitic as soon as the animal arrives. The risk of introducing footrot on the farm makes it necessary to check the feet as soon as the animals arrive in order to avoid buying affected or doubtful animals.

Even if it is impossible to manage all risks, especially those related to abortive diseases such as Border Disease, Visna-Maedi or Johne’s disease, it is important to know the health status of the seller’s herd.

The mixture of animals from several origins in a new environment can also favour the accelerated emergence of diseases such as ecthyma, scabs on the feet, caseous abscesses (CLA), keratitis. These episodes are more painful when pregnant ewes are included due to the increased risk of abortions.

When buying ewe lambs or rams, it is recommended to buy animals with health guarantees and to give preference to animals qualified by the selection centres.

advance preparation for lambing

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The lambing period is a stressful period. Advanced preparation of the lambing equipment can improve productivity and reduce stress.

A cleaning-disinfecting protocol and an inventory of all lambing materials (gloves, lubricant, lambing ropes, aid to align lambs heads during birth), prolapse harness/retainer, iodine for navel disinfection, thermometer is required. At birth ensure access to: frozen colostrum, feeding bottles and teats, stomach tubes, heat lamp, milk replacer. To assist ewes: syringes and needles, oxytocin, energy boost, injectable calcium and antibiotics (under veterinary advice). Lastly: marker spray, tags, disinfectant for lambing equipment and bedding and disinfectant for pens (e.g. straw, lime), fostering crate and basin for wet fostering lambs to a surrogate mother.

During the birth period, the shepherd needs to follow the lambing process and to know how to assist lambing. Dystocia is one of the most important contributors to deaths in newborn lambs. The main causes of dystocia are a disproportionate size or poor presentation of lamb, abortion and prolapse. Assisting difficult births requires practical and theoretical knowledge. The neonatal period is the most vulnerable period in a lamb’s life, therefore understanding the significant risks can help to develop preventative strategies such as additional feeding in the last pregnancy period and reduction of environmental stress factors.

Adequate feeding of the lamb

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At birth, colostrum is extremely important for the young animal because it provides disease-fighting maternal antibodies as well as essential nutrients. If colostrum is not available or insufficient from the ewe, the lamb can be provided colostrum from another ewe, ewe or cow frozen colostrum warmed to body temperature.

For the first two weeks of life, lambs need to be fed every 2-3 hours (night meals can be provided every 4 or 5 hours) and then every 4 hours for the next weeks, according to their health status.

For the first several weeks of life, lamb requirements for nutrients are covered by maternal milk. By the time lambs are 4 to 6 weeks old, they may be obtaining as much as 50 percent of their nutrient intake from sources other than their mother’s milk.

Feeding programs of lambs vary, usually affected by the type of production, market options, geographic location, and cost and availability of feedstuffs. Most of the time, lambs born in winter are creep-fed and finished on high concentrate diets, whereas lambs born later in the season are finished at pasture with the ewes. Some feeding programs utilize both pasture and grain.

Control of footrot in sheep 

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Footrot caused by Dichelobacter nodosus is a harmful disease for sheep farming. It is imperative to monitor the flock and implement various control measures against the disease.

Firstly, it is necessary to know the risk factors (humid and temperate periods, muddy areas) and to quickly detect the presence of the disease in the flock. To do this, when lameness is observed, or during hoof trimming, the identity of the animal must be recorded and the severity and intensity of the lesions scored according to scale.

A foot-lameness control plan is mainly preventive by a rigorous evaluation of purchased animals, application of quarantine, and by avoiding contact with other herds.

Moderate lesions can be controlled by external and internal hygiene measures, footbathing, foot trimming and individual antibiotic therapy. The footbath must be carried out correctly (pre-washing, liquid level and concentration of disinfectants, time spent, drying).

If the disease is severe, vaccination and antibiotic therapy will be used, after identification of the strain(s) present in the flock. Finally, culling of worst-affected animals and those with recurring cases helps to progressively eradicate the disease. When the outbreak is very large, a repopulation of the herd should be considered.

Handling of dead animals: Hydrolysis

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One of the problems that can break the biosecurity of a farm is the system for collecting dead animals. There is a great risk of spreading disease on the farm via carcass collection vehicles which travel from one farm to another. In addition, because they are fresh carcasses, the risk of being potential disease carriers is high.

A very effective alternative is the hydrolysis of carcasses on the farm. The carcass hydrolysis system provides temporary storage of carcasses and byproducts where the spontaneous phenomena of self-hydrolysis occur. The hydrolysis that takes place in carcass is similar to that which occurs in other organic materials that are susceptible to self-destruction.

With these systems, authorized by the EU (Regulation 749/2011 of 29 July 2011), a specific container is required to perform hydrolysis and store the dead animals for 6 months.

With this system the following is achieved:

  • Limits the microbiological load to inside the hydrolyser on the farm, reducing the potential contamination that this product has to other farms.
  • Decrease the number of collections per year. Going from 100-150 times to 4-6 times.
  • Direct transport is made from the farm to the authorized processing plant. The truck arrives at the farm clean from the processing plant and returns without passing through any other farm.
  • The same hydrolyser container is returned empty, clean and disinfected to the farm of origin, reducing the risk of spreading pathogens.

Colostrum management in lambs

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Colostrum contains a complex mixture of proteins that actively participate in the protection of the neonate, through passive immune transfer, against pathogens and other postpartum environmental challenges.

Animals growing under an artificial rearing system need to be fed, by bottle, an adequate amount of colostrum during their first days of life, to obtain adequate passive immune transfer and increase future productivity. It has been reported that lambs not fed colostrum in the first hours of life are more susceptible to diseases and mortality. Therefore, it is crucial to provide an optimal colostrum source.

Lambs need to be fed an amount of colostrum (pasteurized at 63 degrees Celcius for 30 minutes) equivalent to 8 g of IgG/ Kg body weight, divided into three equal meals in the first 24 h after birth, given 2, 14 and 24 hours after birth. This corresponds, on average, to about 150-200 ml colostrum per feeding. The amount of colostrum produced by the mother and its composition can be affected by several factors such as nutrition and/or litter size. Lambs fed with cow colostrum run the risk of developing anaemia. In addition to the amount of colostrum fed, management during the milk feeding and weaning period, such as stress produced by dam separation, milk quality and suckling frequency, can affect the final immune status of lambs.

Thus, feeding the newborn ruminants with adequate quantity of colostrum, as early as possible after birth, is an effective good practice to obtain good passive immune transfer for optimal protection of lambs, so their health is improved and less likely to need antibiotic treatments for the infections.

The prevention and control of mastitis in sheep

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Mastitis is a major a problem in dairy farming, being a threat to animal health and welfare, production efficiency, and product quality. Mastitis is the result of contagious pathogens such as Streptococcus agalactiae, Mycoplasma spp. and Staphylococcus aureus, entering the mammary gland via teat canal, establishing an intramammary infection (IMI) and resulting in an inflammatory reaction. The disease can be in a clinical or subclinical form. 

In the subclinical form; milk production decreases, bacteria are present in the secretion, and composition is altered. Transmission of contagious mastitis pathogens mainly occurs during milking. Bedding is also very closely related to the bacteria exposure of the sheep since teats may be in direct contact with bedding materials which are a  primary source of mastitis causing pathogens. 

Tests have to be used to detect the presence of intra-mammary infections (IMI) either directly (culturing of the causative bacterium) of indirectly (by showing inflammatory response including an elevated somatic cell counts-SCC). 

A vaccination program is recommended to be included in the control of mastitis together with hygiene methods in sheep flocks. Mastitis treatment may contribute to reduced transmission of infection, but antimicrobial treatment of mastitis is not always successful. When treatment fails, removal of the infected animals from the flock, to prevent contagious transmission, may be necessary. 

The implementation of biosecurity measures such as: 

  1. good husbandry and milking practice with regular maintenance of the milking machine, and 
  2. use of post-milking teat disinfection  

can prevent introduction and transmission of mastitis in dairy ruminants, and consequently, reduce antibiotics usage.