By Karen Nicholson of Stepping Stone Farm Alpacas
Internal parasites are a part of most every livestock producer's farm. Regardless of whether they are pasture raised or in a confinement setting, livestock will be exposed to internal parasites at some time in their life. In the Northeast, and in other humid climates, parasites can be a major problem for small ruminants, such as alpacas, sheep and goats.
So why adopt an organic approach to parasite management? Chemical dewormers are losing their effectiveness, with parasites developing resistance to them at an alarming rate. There are some parts of the country where internal parasites have developed resistance to all commercially available dewormers without new ones being developed. In our area where Meningeal worm is a threat and there is widespread use of Ivermectin, parasites that were formerly managed with this drug have grown resistant to it. Resistance means that not all the worms are killed during deworming. The surviving worms pass that genetic resistance on to offspring.
The growing concern about the resistance of internal parasites to all classes of dewormers has caused people to look for alternatives. By looking at the whole farm as an interrelated system, it becomes apparent that there are parts of the system that can be managed to decrease internal parasites and their effects. This management whole farm approach not only postpones the day when chemical dewormers no longer work, but it also increases the overall health of the individual animal (and future herd), and it may even decrease costs.
It All Starts with Prevention and Management:
- Healthy, properly conditioned animals – Nutrition plays a major role in how well alpacas are able to overcome the effects of internal parasites. Quality feed, fresh water, minerals, managing stress and monitoring for condition are essential. Check weights/body score and mucus membranes and observe the herd regularly to monitor condition.
- Stocking Density – By maintaining a healthy stocking density you decrease the overall infectivity rate of the farm. It also allows you to have more areas (pastures, etc) that you can rest for longer, creating more 'clean' areas. To calculate the optimum stocking density, you'll find a good worksheet at www.sarahflackconsulting.com.
- Quarantine – When an animal comes or returns to the farm, keep it with a buddy in a quarantine area for one month while monitoring their health and doing regular fecals. This can protect your herd (particularly the geriatric, cria. weak or pregnant/lactating females) from parasite overloads and other disease.
- Pasture Rotation – There could be an entire article alone on this subject. If we begin with an understanding of the interrelationship between the animal, the plants it eats, and the soil on which those plants grow, then it will become clearer how parasites infect the animal and how they can be managed so as not to cause as many problems. Narrowing it down to two subjects, there are: rotation for the health of the grasses and soils, and rotation to work with the lifecycle of parasites.
- Lifecycle of parasites – Although some parasite eggs can live in the soils year round without a host, many of the parasites we are dealing with go through up to a 21 day lifecycle outside the host. The infected manure is dropped, three days later the eggs hatch into larvae searching for a host (the alpaca), and most die by 21 days if a host does not ingest them. Consider wildlife where parasite loads generally do not cause disease and death in the host because, instinctively, wildlife are on the move. The parasites have no host if the animal is no longer where the manure (eggs/occysts) was dropped. The same principle applies to livestock. If we rotate our animals every 2-3 days to new pastures and do not put them back on that same pasture for a minimum of 21 days, we are significantly decreasing the numbers of larvae available to be ingested. Ideally, you want to size your pastures so that they eat it down to not less than 2" in 3 days (or even better, 12-24 hours) as most larvae live in the bottom 1-2" of grass.
- Health of Grasses and Soils – Healthy soil grows healthy plants. Healthy plants provide good nutrition to animals. Unhealthy soils also have fewer of the beneficial organisms (beetles, earthworms, nematophasous fungi, etc) that can kill parasites. Chemical dewormers also kill most of these organisms that are working for you. Test, monitor and fertilize your soils as necessary. Grasses - overgrazing (below 2”) damages pastures as that alpaca will continue to graze the most vigorous and productive plants in the pasture down very short, which will stress the root system of the plant, in turn reducing the productivity of that pasture. If this happens every year, several years in a row, it can greatly reduce the amount, quality and the diversity of plants the pasture will produce. Overgrazing also cuts down on the animal's efficiency and dry matter intake, resulting in poor performance.
Then moves to Monitoring and Treatment…
- Fecal Monitoring – Testing and monitoring animals is crucial to determining the progress and success of your parasite management program and in determining which animals are resilient and which are not. The ultimate goal is for the animal to develop immunity or resilience to parasites. NOT to be parasite free.
- Observation is one method – identify which animals always keep condition, have firm beans, etc. regardless of stress or the performance of the rest of the herd.
- Fecal Testing is another method of monitoring, and aids in identifying which animals are resilient and which always carry heavier loads. Sometimes it can identify a problem much more quickly than observation. Once parasites have been identified in a fecal test, they can be monitored by additional tests for increased/decreased loads, significantly reducing the number of deworming treatments. Consider doing fecal testing on-farm as it can get expensive.
Parasite overloads are a symptom that there is sickness within the farm. It is disease in individual animals, but also an indication of imbalance or a problem on the farm. While implementing all strategies can seem overwhelming, slow changes can make dramatic improvements in parasite levels and the overall performance or the herd. If we were to choose the most effective methods they might be:
- Prevention – good nutrition is essential, grazing management and selecting resilient dams/sires to improve crias.
- Early Observation – catch symptoms of disease or ill thrift early thru routine observation of the herd. Trust your gut instinct. Use fecal monitoring as a preventative and monitoring tool.
- Treatment – as the option or last resort, but certainly when the animal's health requires it.
Karen Nicholson has a herd of ten alpacas at Stepping Stone Farm Alpacas in Stowe. While the information shared is not meant to replace the protocol set up by your veterinarian, these methods are being successfully used with many different types of livestock, including camelids. Any comments or questions can be directed to: Karen@stowealpacas.com.