Author: Brian

Part of my work on Tristan da Cunha involves keeping the islanders informed as to what we are doing, and why. It is important that I try to develop a general understanding of the steps that we are taking, the advances that we are making, and our overall objectives.

I have just sent out the following notes, which may be of interest off-island as well.

TDC Farming News                       Issue 3                          April 2018

Cattle Ear Tags

 I am sure that everyone has seen the new ear tags in the cattle, which were applied last week. There is a high-visibility tag in one ear, and a little button tag in the other ear, each with the same number. These tags will serve as an individual ID for each animal, and they will enable the Department to maintain full records of each animal from birth to death, including breeding details, treatments, and ownership details. All cattle on the Settlement Plain have been tagged. From now on, soon after calves are born they will be tagged.

Cattle owners may choose, if they wish, not to cut-mark their calves in the future since the ear tags will provide a clear identification of each animal.

Vannessa has a list of owners and numbers, which is available if anyone wishes to check what numbers their own cattle carry.

Cattle owners are asked to please notify the Department if they give or sell an animal to another person, so that the records can be updated. Also the Department needs to be informed in the event of the death of an animal, whether through slaughter or any other cause. Also, cattle owners are asked to please notify the Department in the event of the loss of an ear tag, so that a replacement tag can be fitted.

Reseeding

As part of the Department’s programme of pasture improvement, a 4-acre plot just to the west side of Jenny’s Watron has been fenced off and reseeded.

The area inside the fence was sprayed off some three weeks ago, and in the last week the ground has been limed, fertilised, a seed-bed prepared, a grass seed mixture sown, and finally the area was rolled.

The seed mixture has been especially prepared for us by a specialist seeds company in Scotland, based on their experience of broadly similar conditions in the western Highlands. The mixture includes specific varieties of Italian ryegrass, perennial ryegrass and cocksfoot, with some white clover. These grasses are high-yielding and high-digestibility varieties. If we are able to obtain good establishment of these productive grasses they should go some way towards addressing the acute overgrazing that we see on the island (together of course with all the other actions that are needed, including the ongoing application of lime and fertiliser and the reduction in herd size)

If weather conditions permit, we hope to reseed a large area at Pigbite, where the alluvial deposits brought down by the floods a year ago currently represent a net loss of grazing land. It would be very good if we can in this way recover some of the land lost to the floods.

It is also intended to reseed the Hospital Field, once all the débris left by Gulliford Try has finally been cleared.

It was mentioned above that the reseeded area at Jenny’s Watron was rolled after sowing the grass seed. The reason for this is that rolling helps boost germination, and it helps grass establishment by conserving soil moisture. The rolling was carried out by an island-made machine comprising two recycled gas bottles welded together and filled with concrete – it is a perfect size and weight, and cost virtually nothing!

Sheep Breeding

Our new burdizzos (bloodless castrators) arrived some weeks ago, and the Department spent a day selecting ten of the best ram lambs to be kept, and castrating all the rest. This operation should be carried out every year from now on. In the meantime we are hopeful that we can bring some fresh blood into the island sheep by using AI. This is a much more complicated procedure than cattle AI, and we are in touch with a specialist who may be able to help us with this breeding programme.

Gypsum for Potatoes

We had a very positive reaction to our notice about applying gypsum to the ground before planting potatoes, in order to improve cell structure and keeping qualities of the potatoes, with a likely reduction in the incidence of soft rot. An order is now being processed for two tons of gypsum, which will be sold through the Agrishop.

Winter Feed for Cattle

 A number of people have taken us up on the offer of seed and lime for the winter production of fodder crops in the Patches, these crops include swede, turnip and kale. The Department has also planted some of these crops in the Mission Gardens, to give us first-hand experience of the problems and potential for this sort of winter fodder production.

Fruit Trees

 We hope to repeat the programme we carried out last year for the import of young fruit trees – apples, pears and plums. However, our supplier from last year has just told us that he is only prepared to supply minimum quantities of one hectare (2.4 acres) per variety! We are looking now for a nursery that can be more accommodating.

Greenhouses and Gardens

 On a small scale, we are now in production of our winter crops including broccoli, cauliflower and cabbages, and for the first time crinkly kale should be in the shop this week. In the greenhouses, cucumbers and green peppers are in production, and we should be shopping tomatoes again very soon. We have some lettuces that are now ready, although we have had a bit of a set-back in that some lettuce varieties that we planted are not the varieties that it said on the packet. The intention is to grow salad crops, including lettuces and radishes, throughout the winter months.

A large consignment of produce was sold to the cruise ship Le Lyriol, and we hope to keep in touch with the cruise ships in order to produce to their requirements in future years.

We have quite a number of indoor and outdoor ornamental plants in the greenhouses, and it is intended to set up a day for these to be sold outside the Agrishop very soon.

Bee and I hope to be off on our annual leave on the Edinburgh – we wish everyone a pleasant winter with enough rain to obtain good grass germination without it being too much for personal comfort!

Alasdair Wyllie – Agriculture Adviser and editor of TDC Farming News

It is not known exactly when the first cattle arrived on Tristan, but it was certainly in the very early days of the community in the early 1800’s. The Leader of the island then was Corporal William Glass, who had somewhat utopian plans for the structure of the social community which included shared ownership of all the island’s assets, including the cattle. However, this cooperative ownership idea was changed before long, and individual ownership was established. Some individuals built up quite large herds, and they profited by bartering the meat with visiting ships, in exchange for tea, flour, sugar, and hardware items. Overstocking rapidly became a problem, and cattle numbers were controlled by hard winters resulting in starvation and death. The worst year was in 1906, when numbers had built up to about 700 head of cattle, and the bad winter resulted in the death of around 360 individuals.

Individual ownership of cattle remains to this day. Every household has a quota of cattle, and these cattle are largely run as a herd, with the Agriculture Department carrying out some of the services for the cattle, including health treatments, fertiliser and fencing of the pastures, and the provision of bulls and AI. However, because the cattle are all individually owned it is not possible for the Agriculture Department to make any of the all-important management decisions, such as the selection and culling of animals for genetic improvement, and such as limiting overgrazing by means of herd reduction.

Efforts have been made in the past to improve the bad situation that had resulted from overgrazing. Back in 1975, a quota system was introduced, with each household being limited to 4 breeding cows. This was later reduced to 3 per household, and in 1983 it was reduced further to 2 per household.

Overgrazing, on the scale found on Tristan da Cunha, has resulted in a circle of negatives. Cattle have been undernourished, and the poor growth rates have meant that steers go to slaughter at well below optimum weights, and are kept far too long in the herd before slaughter resulting in animals being on the pastures for too long, thus there are too many mouths to feed on a continuous basis. The cattle themselves have to spend far more time grazing than they should, and thus they spend too much energy in the grazing process. On Tristan, another dimension is that the fact that the cattle are having to graze grass that is too short means that they are grazing grass that is loaded with volcanic grit which is very abrasive, and which wears their teeth down at an unacceptable rate, this itself resulting in early death. Meanwhile, the forces of grassland ecology have progressively resulted in the surviving grasses being those that are adapted to growing very close to the ground – the grasses that try to grow upwards merely get chewed down as soon as they rise from the ground. Also, with so little leaf area, the overgrazed grass takes far too long to recover and to start growing again when the stock are moved to another pasture. To this whole process can be added the shortage of nitrogen fertiliser being applied, and a very low pH because of no lime being applied to the grasslands (resulting in very poor grass growth rates). Lifetime stunted growth in the cattle, and fertility problems, are two other consequences of poor nutrition.  Altogether, the overgrazing has made the situation with both cattle and grass progressively worse, year after year. To this unhappy cycle you can add the effects of mineral deficiencies that are known to exist here, and a further dimension is the loss of roughly 10% of the grazing area as a result of the silt and rock slides that took place in the floods of April 2017.

Nearly a year ago, I presented a report which went into great detail on the cattle crisis, and which listed some options that could be selected. This included the possibility of reducing the quota from two cows per household to one. The Department was obliged to carry out a referendum on the subject, which showed no public appetite for change. However, although the reduction in herd size was not at the time selected, the issue was widely discussed throughout the year, particularly when the condition of the cattle was visibly deteriorating. The matter came up to the Island Council once again just a few weeks ago, and the decision was made to reduce the quota from two cows to one. A brave and historic decision!

The benefits of this decision will not be immediate. The action to halve the adult cow quota will not be effective until the end of March 2019, to give people time to select and cull the surplus animals. Bearing in mind that the adult cows make up only about one third of the total herd, it will then take three years before the reduction in cow numbers passes through to all the young stock. Thus we are looking at a four-year programme of cattle number reduction.

Although there are very obvious economic and management benefits of greatly reducing cattle numbers and overgrazing, it is not possible to predict with any accuracy how the actual numbers will evolve. This is because it is a dynamic situation with many different factors involved. For example, the islanders may follow trends elsewhere in the world and reduce red meat consumption in favour of fish (which of course is plentiful here) resulting in a reduced interest in maximising individual ownership of cattle. Also, there is a declining human population on the island, hence there will be a decline in the number of households having a cattle quota. In addition, it can be expected that better grazing will result in faster growth rates, resulting in beef cattle reaching slaughter weight far quicker, so that at any given time there will be proportionally fewer young stock than is the case at present. This latter point is key – if the cattle reach slaughter weight quicker, they will be less time on the hoof taking all the costly inputs of medication, fertiliser, fencing, and so on. It is noteworthy that the two young bulls that arrived recently from South Africa, at 16 ½ months of age, were massively heavier than any of the island steers which are generally slaughtered at an average age of more than three years. This point was certainly not lost on the islanders, and the timing of the arrival of the new bulls, just a few weeks before the Island Council decision, was fortuitous in providing visual evidence!

Around the community, the feedback I am being given since the Island Council decision is that “something had to be done”.   It is interesting to reflect on the processes of debate and decision-making on the island. In brief, it seems that the ‘voice of the people’ is an essential element in the debate on important local issues, but that there is respect for the hard but sensible decisions that sometimes have to be made by the elected representatives on the Island Council.