Urban Food Chains

the links between diet and power

dairy
Milk by numbers
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Milk is around 90% water, so it makes sense to stabilise it as butter or cheese or milk powder before trying to move it anywhere. A good example would be New Zealand, which has a network of butter/skim milk powder plants, where milk is centrifuged to extract the cream. This is made into butter, while the remaining skimmed milk goes to a drying tower and leaves as skim milk powder (SMP).

The UK has a tradition of marketing its milk as liquid milk, which is either pasteurised, sterilised or put through an Ultrahigh Heat Treatment (UHT) line. UHT cartons will have a life of around a year at ambient temperatures, sterilised milk should be protected from the light, but will last indefinitely in unopened bottles.

Using a centrifuge, milk for pasteurisation or UHT lines will be standardised at 4% or 2% or zero percent for full cream; semi-skim or skim respectively. Surplus cream is usually collected in a tank for sale on the industrial market. A milk packing plant can quite easily generate a tanker load during the course of a week, for most of the year, with the exception of a Christmas peak in UK sales of cream. Before Brexit, tanker loads would often travel as far as Germany and be a viable proposition.

See Butter by numbers.

See Cheese by numbers

Milk powder footnote

All milk for powder making must be centrifuged before it goes through the drying tower. Any remaining cream or protein would block the fine nozzles used to spray the milk into a rising column of hot air. The fat-free Skim Milk Powder is collected from the bottom of the tower.The fat content is restored if there is a need for Whole Milk Powder or a custom formulation for food manufacture or baby foods.

dairy livestock
Cheese by numbers
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When you come to realise that milk is made up of water — 90 percent or more — it becomes clear that it needs to be turned into something a bit more user-friendly to be transportable. Making cheese has routinely been a convenient way of stabilising fragile milk and preparing it for a longer journey to its end user. Milk proteins will be retained and a proportion of the cream will be either removed or additional cream will be added, depending on the recipe. Cheddaring cheese is basically a technique for extending the working life of milk, using the existing solids. The progression is laid out in the table below.

Having made curd with the milk, there is inevitably some loss of the finely divided protein particles that are retained in the whey. The whey was traditionally fed to pigs, which is why the history of livestock farming in Denmark was so closely integrated. A significant component of Danish bacon in the nineteenth and twentieth centuries started out as whey from cheesemaking.

Depending on the density of grazing livestock — the example here assumes 20 lactating cows to the hectare — there will always be a certain amount of agricultural land that will be blocked from local use by the commitment to export the production it supports. This is a topic to which we will return. For now, it is sufficient to assume that dairy producers will need three lactations (integer values) for every tonne of milk solids that are recovered and transferred into cheesemaking. In addition, there will be a need for three twentieths of a hectare of grazing land to meet the Livestock Unit level in this model.

There is a greater diversity among cheeses, reflecting their moisture content and how the whey is removed during the cheesemaking process. As a cheese ages, it will go from being a crumbly wet curd and solidify into increasingly dense cheeses. Whole cheeses are matured for up to two years in the case of hard cheeses like parmesan or Grana Padana, a year or more for mature grades of Cheddar, to just six weeks for soft cheesses like Camembert or Brie. The protein can be more or less elastic, depending on how much heat has been applied to the curd and other factors in the process.

insects
Are we ready for insects?
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We are told by industry sources that there are more than 1,900 species of edible insects. There is no simple way of checking this figure or defining what is considered edible or not… Despite having such a broad palette to choose from, most manufacturers go for three easily recognisable species: mealworms, crickets and grasshoppers. In keeping with the crunchy post-processing state of the insects, it is hardly surprising that there are lots of crispy snack products to choose  from.
Good news for the squeamish: insect products will keep for about a year in a cupboard, longer if the contents are clearly labelled. The allergy risks are similar to those encountered with shellfish and the pack sizes are  modest.
Insects are good value for money, though. You can extract 60g of protein from 100g of insects, whereas you would have 55g from 100g of beef. There are environmental discussions to be had about insects, too. Smaller environmental footprint, rapid source of protein and traceable with it. Hmm…

food production livestock plants vegetables
A broken system
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The Environment, Farming and Rural Affairs select committee (EFRA) has recently published its findings on staff shortages in the UK food industry. It frames the problem as half a million unfilled jobs in a sector with just over four million workers.

The pig industry and field crops are judged to have been hardest hit: government measures to counter a crisis situation were branded as “too little, too late” by those in the sectors concerned and there is little reason to suppose that the government has learnt a great deal from a crisis that is taking agricultural businesses off the map.

The covid pandemic is trotted out as a major contributing cause of the crisis, but as early as 2017, EFRA was hearing evidence from UK veterinary experts that Brexit would cause consequential and structural damage to UK agriculture. This damage is being done, but Brexit is not being blamed for it.

For all the positive noises coming out of EFRA over the government’s welcome measures to make it easier for UK businesses to recruit specialist food industry workers, the stage is set for a chorus to emerge from the wings and narrate the closing scenes of this very public Greek tragedy as it unfolds.

The UK food industry generates GBP 127 billion a year – more than 6% of the Gross Value Added to the national economy. It should be added at this stage that this figure for the sector includes multiple food retailers and their staff.

The National Farmers’ Union reported that a 33% gap in the work force meant that 24% of the UK daffodil harvest went unpicked, while one in ten growers in the Lea Valley Growers’ Association did not sow a third cucumber crop in July 2021, for the lack of people to pick the crop.

Fresh produce producer Riviera Produce Ltd left produce valued at half a million pounds to rot in the fields, while Boxford Suffolk Farms ltd reported that it lost 44 tonnes of fruit due to labour shortages.

The British Meat Processors’ Association warned that its members faced a shortage of more than 15% in staff numbers, while the National Pig Association reported a “…desperate lack of skilled butchers…”, while pig farms were facing serious gaps in their work force. The British Poultry Council went into the summer of 2021 facing a gap of 6,000 staff among its members, in a sector that employs the equivalent of 22,000 in full timers.

There is no reason to suppose that any of these important industry figures is making up or overstating the problems they face. But they all need rather more than a figurative pat on the back and meaningless platitudes.

The report HC713 Labour shortages in the food and farming sector can be consulted online or downloaded at https://committees.parliament.uk/publications/9580/documents/162177/default/

dairy livestock
Milk prices set to take off
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The farmgate milk price has risen by nearly 24% during the year ending March 31, 2022. For most of this time, prices tracked the five-year minima, but started to rise steeply from January and into February, closing the gap on five-year highs as the spring flush appears on the horizon. This is the time of year when the majority of UK dairy farms plan for calving, since there is usually strongly growing grass and the longer days promise more favourable weather for the next generation of cattle.

With a high proportion of cows starting a lactation in a normal year, milk volumes would go up, reaching a peak later in the summer. A slower start to the spring flush is a marker for a more difficult year, while the rising farmgate price gives cause for concern, since it would suggest that there are fewer lactating cattle to supply the market.

There is, however, another factor that will push producer prices up. The UK dairy industry has a lot of milk tankers on the road and unprocessed milk is a high mileage market. Steep rises in fuel costs will also impact the headline producer price of milk. source

animal products food production
Producers get a grip on their markets
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Levy-funded body AHDB routinely publishes snapshots of retail market trends, like this one from Retail Insight Manager Grace Randall. Demand for red meat is being boosted by a five-year high in ready meals sales, Randall tells us, from her reading of Kantar data. The category is worth more than a billion pounds a year at retail prices and during January 2022, British consumers ate 260 million meaty ready meals. The key factor is a return to time poverty in the wake of the pandemic; millions of people don’t have time to spare in the kitchen cooking food.

animal products livestock pigs UK
Pig sector still struggling
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Despite some welcome signs of change in the fortunes of the pig industry, there are some ominous long term indicators. slaughter weights are starting to ease off from January’s high point. But at about 94kg deadweight, this year’s slaughter pigs are still five kg a head more that this time last year.

Welcome news from Morison’s when the retailer raised its contribution to production costs (SPP) by 30p to GBP 1.80. Pig producers need more retailers to do likewise. More to the point, producers need a more reliable system for recovering their cost of production, just to stay in business.

January pigmeat imports totalling 83,000 tonnes were up over 20% in December, not to mention double the volumes imported a year ago. Bacon imports in January were 27,000 tonnes, compared to 9,500 tonnes a year ago and 17,500 tonnes in December.

Market trends like these spell trouble for UK pig producers.

Since writing this piece in the spring, the AHDB has reported a recovery in market figures to nearer normal levels. However, this does not mean that pig farmers are any better off than they were earlier in the year.

livestock pigs UK
40k and counting
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Delegates at the National Farmers’ Union conference at the end of February learn that at least 40,000 healthy pigs have been culled and taken out of the food chain because of a continuing failure by abattoirs to collect and slaughter all the pigs they contracted to take last year.
Pig farmers up and down the UK are struggling in an ongoing crisis that is leaving hundreds o pigs a week on farms, eating food that is hitting record highs. The BBC cites a Norfolk farmer (https://www.bbc.com/news/uk-england-norfolk-60516864) who is sending 200 a week out of his 300 contracted animals, leaving him with 100 more pigs every week to feed. They eat 10.5 kg of feed a day ad by the time they are finally killed, they will have eaten an extra quarter of a tonne of feed. This is unplanned buying for the animals concerned, at a time when feed is at an all-time high and wheat prices are well over GBP300 a tonne.

livestock pigs UK
Why pig slaughter weights matter
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Since the end of October last year average pig slaughter weights have been rising steadily, hitting 95 kg during the week ending January 8, 2022. This is about 5kg above the long term average. This is due to abattoirs refusing to take all the pigs they contracted for at the beginning of the breeding cycle. Processors face a shortage of skilled labour in the killing lines and boning halls, with the result that pigs being held back on farms.

[chart to follow]

Here, they are eating feed that was not costed into the business and since UK male pigs are not routinely castrated, they are increasingly likely to pass puberty and be affected by boar taint with the onset of breeding condition. This renders them unsaleable and inedible.

The weight of a pig at slaughter is critical to its commercial value, since overweight pigs put on fat in the muscle tissue and their conformation is no good for retail or foodservice clients.

A week later and no sign of any change.

British pig prices dropped even further in the week ending January 15. The Standard Pig Price (SPP) dropped to 139p/kg, the lowest it has been for almost a year. Pig producers are still looking after pigs that should have left their holding long ago, as the average carcase weight set a new record at 95.42kg (source AHDB). Since these animals would normally have left for slaughter, farmers are having to buy grain on the spot market, pushing feed prices up in the process.

livestock pigs UK
British pigs start 2022 with record average carcase weight
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As overcrowded pig farms send their first lorryloads of slaughter pigs to the abattoirs, AHDB is reporting an all-time high of 94.12 kg for the national average carcase weight. As if proof of poor conformation was needed, back probe measurements averaged 11.8mm in the week ending January 1. Predictably, the percentage of pigs meeting the SPP specification has sagged to 84%, compared to a long term average of 93%. Without culling or moving thousands of pigs that have been contracted, but not taken by processors, the pig sector crisis will deepen: ignoring it will not solve anything.

AHDB pork data can be found here.