Volume 62 Supplement 4
Global trends in milk quality: implications for the Irish dairy industry
© The Author(s) 2009
Published: 1 April 2009
The quality of Irish agricultural product will become increasingly important with the ongoing liberalisation of international trade. This paper presents a review of the global and Irish dairy industries; considers the impact of milk quality on farm profitability, food processing and human health, examines global trends in quality; and explores several models that are successfully being used to tackle milk quality concerns. There is a growing global demand for dairy products, fuelled in part by growing consumer wealth in developing countries. Global dairy trade represents only 6.2% of global production and demand currently outstrips supply. Although the Irish dairy industry is small by global standards, approximately 85% of annual production is exported annually. It is also the world's largest producer of powdered infant formula. Milk quality has an impact on human health, milk processing and on-farm profitability. Somatic cell count (SCC) is a key measure of milk quality, with a SCC not exceeding 400,000 cells/ml (the EU milk quality standard) generally accepted as the international export standard. There have been ongoing improvements in milk quality among both established and emerging international suppliers. A number of countries have developed successful industry-led models to tackle milk quality concerns. Based on international experiences, it is likely that problems with effective translation of knowledge to practice, rather than incomplete knowledge per se, are the more important constraints to national progress towards improved milk quality.
Keywordsglobal dairy industry Ireland milk quality quality somatic cell count
Global markets have been critically important to Irish agriculture for some years. In these, but also in domestic markets, competition will intensify as a result of ongoing moves towards liberalisation of international trade. In this setting, Irish agricultural product cannot hope to compete on price alone, and quality will become increasingly important to Ireland's ability to successfully compete into the future .
An understanding of global competitors, and of global trends in milk quality, will play an important role in the efforts of industry, at all levels, to strategically plan for the future. As a contributor to this process, this paper presents a review of the global and Irish dairy industries, considers the impact of milk quality on farm profitability, food processing and human health, examines global trends in quality and explores several models that are successfully being used to tackle milk quality concerns.
The Global and Irish Dairy Industries
In 2007, world dairy production reached 655 million tonnes, including 551 million tonnes from cows. During the last ten and one year period, there has been an increase of 17.2% and 1.4%, respectively, in cows' milk production. The EU is the largest milk producer, followed by the US, India, China, Russia and Brazil. The growth in milk production is mainly concentrated in China, India and the Americas. In 2006, 6.2% of global production was traded across national borders. There is a growing global demand for dairy products (approximately 3% annually), fuelled in large part by growing consumer wealth in developing countries. Global competitiveness is also fuelling new uses for milk-based ingredients, rising demand for cheese variety, an increase in niche product markets and increased product shelf life. Supply from traditional exporting countries (the EU, Australasia) has not kept pace with demand, leading to the emergence of new suppliers and a period of record international milk prices. In global terms, the Irish dairy industry is small, producing 5.2 million tonnes (0.94% of global production). However, the industry exports approximately 85% of annual production and is a major contributor to the national economy. The industry is also the world's largest producer of powdered infant formula.
Global milk production
a. World dairy production
In 2007, world dairy production reached 655 million tonnes, from cattle (551 million tonnes; 84%), buffalo (12.5%, mainly from India and Pakistan), sheep and goats (3.2%) and other species (predominantly camels, 0.3%) . Almost all countries produce milk for local consumption. However, the cost of production varies greatly depending on factors including labour costs, animal genetics, on-farm technology, and fodder and water availability . In 2006, the largest cows' milk producers included the EU25 (142 million tonnes, 25.8%), the US (82.6, 15.0%), India (41.0, 7.4%; a further 53.6 million tonnes of buffalo milk was produced), China (36.0, 6.5%), Russia (32.0, 5.8%), Brazil (26.2, 4.8%), New Zealand (15.7, 2.8%), Ukraine (12.6, 2.3%), Mexico (10.5, 1.9%), Argentina (9.8, 1.8%) and Australia (9.3; 1.7%). Within the EU25, Ireland was the 8th largest producer of cows' milk (5.2 million tonnes, 0.94% of global production), behind Germany (28.3 million tonnes), France (24.3), United Kingdom (14.4), Poland (11.8), Italy (11.2), Netherlands (11.0) and Spain (6.5) .
There has been strong and sustained growth in global production of cows' milk, leading to a ten-year and one-year rise of 17.2% (from 470 million tonnes in 1997) and 1.5% (from 543 million tonnes in 2006, respectively . This growth is mainly concentrated in China, India and the Americas (Argentina, Brazil, Mexico and the USA). China has experienced very rapid growth in dairy production, with production doubling between 1990 and 2000, then again between 2000 and 2004 . Between 2004 and 2006 cow numbers and milk production increased by 23.0% and 41.3%, respectively . Argentina, Brazil and Chile have achieved self-sufficiency in milk production, and each is now focused on exports. There was a 5.7% reduction in national milk production in Australia between 2004/05 and 2006/07 as a result of sustained drought conditions .
b. World dairy demand
There is a growing global demand (an increase of 3% globally, but more than 10% in some developing countries, and 15% in China) for milk and other dairy products. Global competitiveness is also fuelling new uses for milk-based ingredients, rising demand for cheese variety, an increase in niche product markets and increased product shelf life [9, 13]. The very sharp rise in world dairy prices from late 2006  was driven, largely, by the strong global demand for dairy products, leading to record farmgate prices (exceeding €0.35/l) for manufacturing milk in Ireland . By early 2008, the price spike had peaked for commodities such as milk powders and butter, with market prices rapidly returning to more normal levels .
The Chinese dairy industry has been in crisis since September 11 2008, after news reports highlighted melamine contamination of milk and milk products. Melamine (also known as tripolycyanamide) is an industrial chemical that is used in laminates, glues, adhesives, and plastics. When added to (sub-standard) milk, melamine increasing the nitrogen concentration, suggesting a false increase in protein concentration. Melamine contamination carries a significant public health risk; by September 22, Chinese authorities had reported that 52,857 children had been treated for renal complications, and at least four children have died . There has been a rapid international response, including a decision by the EU to ban the importation of all baby food containing Chinese milk .
c. World dairy trade
Until fairly recently, the world dairy trade was considered a secondary market for the disposal of surplus commodities. In recent years, however, the trade has been facilitated by improved refrigeration and transportation technologies, and is being increasingly influenced by increasing global demand for dairy products . The international dairy trade has been dominated for many years by the European Union (with 30% of global dairy trade) and Australasia (New Zealand, 32%; Australia, 12%) . In broad terms, the EU focuses on the export of quality cheese to nearby traditional markets and to North America, whereas Australia and New Zealand, with low-cost milk production and active international marketing, are prominent suppliers of cheese and milk powder to Asian markets. New Zealand, in particular, is highly responsive to changing global demand .
In 2006, 40.2 million tonnes (milk equivalents) were traded internationally, representing 6.2% of global dairy production. Milk powder is by far the most-commonly traded product (whole milk powder, 1.75 million tonnes in 2006; skim milk powder, 1.07). New Zealand is the largest exporter, followed by the EU and Australia, with lesser amount from the USA (predominantly skim milk), Argentina, Belarus and the Ukraine . Milk powder is imported by a range of countries in Asia, Africa, the Middle East and Latin America . In recent years, there has been very rapid growth (about 6.8% between 2005 and 2006) in global trade in cheeses (1.58 million tonnes in 2006), from the EU and increasingly from Australasia. Japan, the US, the EU and Russia are key importing markets. In this market, the EU is facing increasing competition from other suppliers, including Argentina. The international butter market (0.9 million tonnes in 2005) is dominated by New Zealand and the EU, supplying Russia, the Middle East and North Africa .
There are several reasons why supply has been unable to match global demand for dairy products. The EU has become less influential in global markets, in part as a result of EU expansion (noting the specific exclusion of within-EU movement within the definition of 'world dairy trade'), limits to dairy production due to quota and environmental restrictions, and the suspension of all dairy export subsidies. Furthermore, drought conditions have led to reduced milk production in Australia , and there has been increased domestic production among countries that had previously imported (particularly Brazil, China, EU, USA) . As a consequence, a number of new international suppliers have emerged, including Argentina, Brazil, India, China and the Ukraine. There has been rapid export growth from Argentina (in 2006: 7% annual increase in dairy production, 40% annual increase in dairy exports) and Brazil (2.5%, 30%), and these countries have the potential to become major dairy exporters . An increased demand for dairy products throughout Asia is likely to be met by several countries in South America (Argentina, Brazil, Chile), as well as Australia and New Zealand . China is likely to remain a net importer of dairy products into the foreseeable future , with demand outstripping the steady increase (19% in 2005) in local dairy production . Prior to 2007, India had emerged as an important exporter of dairy products, particularly milk powder. However, exports were banned in early 2007, in an effort to stabilise domestic milk prices .
The Irish dairy industry
In 2006, the Irish dairy industry produced 5.2 million tonnes of milk, equivalent to 0.94% of global dairy (cow) production . As such, Ireland is a small global dairy producer. However, the industry plays a critical role to the national economy, accounting for approximately 3% to national gross domestic product . Approximately 85% of annual production is exported, to a value of €2.1 billion and representing approximately a quarter of all food exports, to markets including countries in mainland Europe (38% of total exports), the UK (23%), North America (13%), Africa (13%) and Middle and Far East (8%). In 2007, the key outputs from the processing industry included butterfat (147,000 tonnes), cheese (136,000), SMP (skim milk powder)/BMP (butter milk powder) (88,000), choc crumb (45,000), WMP (whole milk powder) (38,000) and casein (40,000). Since 2005, there has been a marked increase in the production of cheese and skim milk powders, and a decrease in choc crumb and casein . Critically, Ireland is the world's leading producer of infant nutrition products, producing 15% of the world's powdered infant formula . Three of the world's top four infant formula milk manufacturers (Numico, Wyeth Nutritionals and Abbott Laboratories) operate in Ireland, generating approximately €506 million with an output in 2005 of approximately 112,000 tonnes of powdered infant formula (from 50,000 tonnes of milk powder and 13,200 tonnes of skim milk). In 2005, the formula milk sector was valued at over $10 billion globally, with a predicted growth in world consumption of 8.3% per annum in volume terms and 5.7% in value terms .
The Importance of Milk Quality
Milk somatic cell count (SCC) is a key measure of milk quality, reflecting the health status of the mammary gland and the risk of non-physiological changes to milk composition. It is also the key component of national and international regulation for milk quality, udder health and the prevalence of clinical and subclinical mastitis in dairy herds. Milk quality is important, with impacts on human health, milk processing and on-farm profitability:
Farm profitability: There are a range of economic consequences of mastitis and mastitis management, relating to treatment, production losses, culling and changes in milk quality. Increased SCC is associated with reductions in milk yield.
Milk processing: High SCC milk adversely affects cheese production, as a result of reduced curd firmness, decreased milk yield, increased fat and casein loss in whey and compromised sensory quality. High SCC milk also affects the quality of pasteurised liquid milk and reduces its shelf life.
Human health: High cell count milk is not associated with direct risks to human health. However, there are a number of indirect risks as a result of poor farm hygiene, antibiotic residues and the presence of pathogenic organisms and toxins in milk.
Raw milk quality encompasses criteria relating to composition (butterfat, crude protein, lactose, milk solids etc) and hygiene (total bacterial count, somatic cell count). Of these, SCC is the most important single indicator of milk quality, reflecting the health status of the mammary gland and the risk of non-physiological changes to milk composition . It is also the key component of national and international regulation for milk quality . An udder quarter is considered healthy if it has an SCC < 100,000 cells/ml and is free of mastitis pathogens [16, 23]. An elevated SCC is indicative of mastitis (inflammation of the mammary gland), generally caused by presence of infectious microorganisms .
In response to consumer demands, the processing industry also has a growing interest in additional milk quality parameters relating to environmental considerations, animal welfare and food safety and traceability [2, 52, 57].
The impact of milk quality on farm profitability
There are a range of economic consequences from clinical and subclinical mastitis, relating to treatment, production losses, culling and changes in milk quality . Collectively, these factors have a substantial impact on the farm business. To this point, however, there has been little consistency among a range of studies in the reported costs of mastitis and the benefits from mastitis management. This variation partly reflects regional differences, for example in labour costs. In addition, Hasala et al.  highlight important methodological differences between reported studies, which make comparison difficult. To overcome this difficulty, these authors propose an economic framework to consistently assess the economic effects of mastitis and mastitis management.
Increased somatic cell counts are associated with reduced milk yield. Estimates of milk loss from high SCC range from 0.3 to 1.8 l/cow/day, depending on the stage of lactation and SCC level [26, 21]. A slightly lower reduction in yield was measured, after accounting for the effect of dilution on SCC among high-yielding dairy cows . There appears to be no loss of milk yield in cows with SCC up to approximately 100,000 cells/ml; therefore, there are unlikely to be economic benefits from driving cow SCC below this level .
The impact of milk quality on milk processing
Milk quality has a substantial, adverse impact on milk processing. Mastitis is associated with an influx of inflammatory cells (hence, 'high somatic cell count' milk), and increased activity of heat-stable proteases and lipases, leading to a breakdown of casein and milk fat [59, 5]. Herds with mastitis problems are also at increasing risk of antibiotic residue violation, as a result of increased antibiotic usage [58, 66].
There are a range of adverse effects from the use of high SCC milk in the production of cheese, including reduced curd firmness, decreased cheese yield, increased fat and casein loss in whey and compromised sensory quality . When used in the production of cottage cheese (made from acid coagulation of milk, rather than rennet), high SCC milk was also associated with increased proteolysis during refrigerated storage . These effects would adversely affect the yield of milk protein concentrate (MPC), which consist of casein-type and whey proteins . Mastitis also affects the quality of pasteurised liquid milk and reduces its shelf life .
The impact of milk quality on human health
There is no evidence that high cell count milk is directly associated with adverse effects on human health . However, high cell counts are associated with increased indirect risks, including poor farm hygiene, antibiotic residues and the presence of pathogenic organisms and toxins in milk. Heat-stable enterotoxins produced by Staphylococcus aureus in milk from infected cows have been implicated in cases of food poisoning .
Global Trends in Milk Quality
The EU milk quality standard (SCC not exceeding 400,000 cells/ml) is generally accepted as the international export standard. Among established international suppliers, particularly in Europe and Australasia, there has been a progressive fall in somatic cell counts. In Norway, the national BMSCC (bulk milk somatic cell count) is 115,000 cells/ml; in Ireland in 2004, this figure was approximately 250,000 cells/ml. Among emerging dairy suppliers, there has been a rise in milk quality as a consequence of industry investment and a focus on export success. Argentinean exporters now exceed international standards in the quality, hygiene, safety and traceability of dairy products.
Within the European Union, EU Council Directive 92/46/EEC lays down the health rules for the production and placing on the market of raw milk, heat-treated milk and milk-based products. These include a requirement that raw milk has a somatic cell count not exceeding 400,000 cells/ml, based on the geometric average of monthly samples over a period of three months. All dairy products sold in the European market (both local and imported) must meet these standards. As provided in EU Commission Decision 96/360/EC, Ireland applies an adjusted calculation method (weighting the SCC results of November to February) to account for seasonal variations in production levels, and where excesses have a physiological basis and cannot be ascribed to a disease of the udder. The EU SCC rules are applied in a number of other countries, including Norway, Switzerland, Australia and New Zealand , whereas the USA and Canada have national penalty limits of 750,000  and 500,000  cells/ml, respectively. In the USA, efforts have been made to reduce the national penalty limits from 750,000 to 400,000 cells/ml [1, 43], but without success. The European rules have essentially been adopted as the international export standard.
a. Established international suppliers
There has been a progressive fall in somatic cell counts among established international suppliers, particularly in Europe and Australasia. In Norway between 1994 and 2000, there was a 44% reduction in the rate of mastitis treatment and a significant reduction in the national bulk milk BMSCC . In 2004, the geometric SCC mean was 115,000 cells/ml . Among other Scandinavian countries, similar levels were recorded in Finland, but higher levels in Sweden (less than 200,000 cells/ml) and in Iceland and Denmark (less than 250,000 cells/ml) . In Australia, there has been a fall in SCC since the late 1990s; in 2004, the average BMSCC was 204,000 cells/ml, and 94.6% and 70.8% of the national milk supply was below 400,000 and 250,000 cells/ml, respectively . Higher cell counts were recorded in the United States  and Canada , which reflects higher regulatory limits on milk quality .
In Ireland, milk production is highly seasonal with 75% of milk supplied during April-September, and 55% and 79% of dairy calves are born in February-March and January-April, respectively . Based on monthly bulk SCC data from three Irish milk processors, SCC declined between 1994 and 2000, but has subsequently risen from 2000 to 2004 (in 2004: geometric mean: 250,937 cells/ml, 52% of tests exceeded 250,000 cells/ml). High SCC herds, which tended to be smaller, contributed disproportionately to the overall mean cell count of processed milk .
b. Emerging international suppliers
Among emerging dairy suppliers, there has been a rise in milk quality as a consequence of industry investment and a focus on export success. To illustrate, consider dairy producing countries in South America. In the 1970 s and 1980 s in Chile, unofficial information suggests that the average BMSCC was >500,000 cells/ml. Since the mid-1990 s, there has been substantial investment in the dairy industry to improve production systems, milk quality and milk products. Further, a scheme of penalty and bonus payments was introduced in 1993, based on BMSCC and bacterial counts. By 2000, the average BMSCC had fallen to 330,000 cells/ml (Kruze 2000 cited by ). Until the early 1990 s in Argentina and Brazil, the development of standards for milk safety and quality was managed by government. Although these standards were rigorous, government often did not have the capacity to rigorously enforce compliance. Following deregulation in 1990, there was substantial industry reform including the imposition of private milk standards for both the farm and processing sectors. In 2006, Argentina exported 215,000 tonnes of whole milk powder and 58,000 tonnes of cheese , and exporters now exceed international standards in quality, hygiene, safety and traceability . In Brazil, the industry has mainly focused on local demand , where quality demands have been lower. UHT milk, which dominates the liquid milk market in Brazil, can be made from lower quality raw milk provided stabilisers are used .
Tackling Milk Quality Concerns
Based on experiences from a number of countries, it is likely that problems with effective translation of knowledge to practice, rather than incomplete knowledge per se, are the more important constraints to national progress towards improved milk quality. A number of national programmes have now been developed to address milk quality issues, including an industry-led programme in Australia called Countdown Downunder. This programme has been built around the concept of capacity-building, which, in simple terms, is about increasing the abilities and resources of individuals, organisations and communities to manage change. The Countdown programme is built around the six steps of the action planning cycle, which includes identifying needs, setting goals, planning action, taking action, reviewing progress, and learning and re-planning. A broad range of resources have been developed to support these steps, including farmer short courses, farm guidelines, mastitis action plans, mastitis focus reports and milk quality awards.
Constraints to progress
Mastitis research has been conducted for many decades , and many aspects of mastitis are now very well-understood . The 5-point mastitis control programme was first devised in the late 1960 s , and remains the basis for infectious mastitis control. A further five points, specifically addressing the control of environmental mastitis, were added later . The US National Mastitis Council produce a ten-point recommended mastitis control programme, which includes:
Establishment of goals for udder health;
Maintenance of a clean, dry, comfortable environment;
Proper milking procedures;
Proper maintenance and use of milking equipment;
Good record keeping;
Appropriate management of clinical mastitis during lactation;
Effective dry cow management;
Maintenance of biosecurity for contagious pathogens and marketing of chronically infected cows;
Regular monitoring of udder health status; and,
Periodic review of mastitis control programme .
Problems with effective translation of knowledge to practice, rather than incomplete knowledge per se, are likely to be the more important constraint to national progress towards improved milk quality [15, 65]. In support of this view:
There are variable levels of on-farm compliance with well-recognised mastitis management practices ;
In a national intervention study in England and Wales, there were significant reductions in clinical mastitis and somatic cell counts following the implementation of well-specified mastitis control plans in problem herds. These authors concluded that 'there may be sufficient knowledge to reduce the current incidence of mastitis ..., but that its application, and also further education, knowledge transfer and motivation may remain essential to achieving improved mastitis control' ; and
In recent years, somatic cell count problems have been resolved on many farms in Ireland following a detailed farm investigation and follow-up support (O'Grady and More unpublished).
In addition, recent work has qualified the influence on variable milk quality premiums on observed milk quality. Financial incentives (a penalty programme for low quality milk combined with a premium programme for very high quality milk) are a key driver for improvements to milk quality [61, 48]. A review of payment systems for ex-farm milk has recently been completed .
Examples of national mastitis control programmes
a. The Netherlands
A national programme to tackle mastitis in the Netherlands was recently established (Uier Gezondheids Centrum Nederland, UGCN, http://www.ugcn.nl/; the Dutch Udder Health Centre), funded by the Dutch Dairy Board (Productschap Zuivel, PZ; an industry organisation) and coordinated by GD-Animal Health Services Deventer under a steering committee, comprising farmers (Dutch Organisation for Agriculture and Horticulture; LTO, Land- en Tuinbouw Organisatie Nederland), industry (Dutch Dairy Association; NZO, De Nederlandse Zuivel Organisatie) and the Dutch Dairy Board. The programme commenced with an initial situation assessment followed by field implementation, based on an understanding of the current situation, implementation of new tools, and international best-practice in mastitis control . The programme is being implemented by a multidisciplinary team, through a series of veterinary practices. A wide range of tools are being used, based on best-practice in other countries, including the use of a 'milk mirror' (a once-yearly specialist farm visit), structured and nationally-consistent protocol, a monthly mastitis update for veterinarians and monthly financial feedback to farmers (money saved from reduced mastitis) .
Australia's national mastitis and cell count control programme, Countdown Downunder, was created in 1998 to help farmers meet new quality standards, improve farm profitability and protect export markets . The programme was instigated following the implementation of EU Directive 92/46/EEC  and the implementation of industry-wide targets seeking 90% and 100% of the milk supply from Australian dairy farms with BMSCC <250,000 and <400,000 cells/ml, respectively . After the first five years of the programme, just under 94% of herds achieved a cell count of less than 400,000 cells/ml . The current phase of the programme (2004-2007) is focusing on the translation of the knowledge and skills of the whole farm team (farmers and advisers) into continuous improvement and risk management on farm .
Mastitis action plans that fit the needs of the farm business;
Jointly-agreed goals by all members of the farm team with day-to-day responsibility for udder health and milk quality; and,
Regular review of the farm situation by farm managers .
The Irish dairy industry is well-positioned to benefit from the increased global demand for dairy products. Milk quality will increasingly contribute to competitive advantage for the Irish dairy industry, for a range of reasons relating to human health, milk processing and farm profitability. A number of countries have achieved substantial improvements in milk quality, highlighting models to tackle milk quality concerns. Ireland would greatly benefit from an industry-led programme, with defined objective national targets, focusing on the capacity of farmers to make strategic and progressive improvements to mastitis and milk quality.
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