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With the advancement of science and technology, the level of farm management is also constantly improving, and related technologies are also constantly improving

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Sure, here's my answer in English:

There could be multiple reasons for this trend. Firstly, the farming and management techniques for cows are constantly improving, including better feed and water, improved housing conditions, and better healthcare. These improvements can increase the health and productivity of cows.

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Due to the development of New Zealand's industrial technology, the improvement and improvement of cow breeds, and the use of higher quality feed

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The progress of science and technology, the development of feeding management system.

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With the development of science and technology, we pay more attention to efficiency. Producing more with fewer cows,which can satisfy people's demand.Another reason is the support of the government.More efficient production can create more wealth.

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I think it is because people's living standard has improved since 2007 and their income has gradually increased. With the gradual rise of social economy, people's demand for high-quality food becomes higher. Meanwhile, dairy products belong to this category of food, so the trend on the chart is gradually rising.

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genetic modification may also be a contributing factor to this trend. The breeding and selection of modern cows focus on improving milk production and quality, which could be one of the reasons why the average amount of milk per cow is higher than ever before.

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The  reason why the trend of the dairy industry is wavelike rise is that the upswing in New Zealand's economy in recent years has led to increased demand for dairy product. Besides， New Zealand's beautiful environment is conducive to the development of dairy industry, so dairy production is constantly rising. Last  but not least ,the diet culture of New Zealanders also has an important influence on the development of dairy industry, people of this country are more demand the dairy .

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Maybe it is due to the environment is getting better which allows for cows to produce more milk and also it is the result of the advancein techonologyand the pressure from people.

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there is an increasing demand for high-quality and nutritious dairy products from consumers, which may encourage dairy farmers and producers to continually improve their production techniques and quality control, thereby increasing the quality and quantity of dairy products.

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The reasons for this trend may be changes in the yield of various products, the expansion of the scale of farming, the progress and application of technology. Domestic and foreign market demand and production willingness to change

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Economic
Because the development of technology has made scarce resources have good use of, which can increase productivity of dairy and improve the quality of dairy products.

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The superiority of New Zealand's natural environment and the continuous development of aquaculture science and technology have increased the output of dairy products to meet the needs of global customers.

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Because science and technology have developed a lot.They worked for dairy well.In the case, milk’s price increased rapidly.

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There could be multiple reasons for this trend. Firstly, the farming and management techniques for cows are constantly improving, including better feed and water, improved housing conditions, and better healthcare. These improvements can increase the health and productivity of cows.

Secondly, the continual development of modern agricultural technology may also be a contributing factor. For example, using intelligent cow comfort systems to monitor and manage cows around the clock can improve their comfort levels and productivity.

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At present, the New Zealand dairy industry has become an important pillar inseparable from the national economic income, the vigorous development of the New Zealand dairy industry, the unique natural environment and government supervision, and according to the current trend, the core of the development of the New Zealand dairy industry is the broad prospects for future development.

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Greater social needs have contributed to the advancement of farming techniques, along with the improvement of New Zealand dairy breeds and technological advances. Modern agricultural techniques can improve the health level of dairy cows and improve the production efficiency and yield of dairy products.

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From an economic perspective, the dairy industry is a significant contributor to New Zealand's economy. In 2020, the industry generated approximately NZD 20 billion in export revenue and accounted for around 28% of New Zealand's total exports. The industry also provides employment opportunities, both directly and indirectly, in rural and urban areas.

From a social perspective, the dairy industry has both positive and negative impacts. On the positive side, dairy farming provides employment opportunities, particularly in rural areas. It also contributes to New Zealand's national identity and culture, with dairy products such as milk and cheese being an integral part of the country's cuisine. However, concerns have been raised about the welfare of animals on intensive dairy farms, particularly with regards to cow health and the use of antibiotics and other treatments.

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Because its technology is more developed and more advanced，and the service is getting better and better.

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The feed quality of dairy cows is better, with the development of science and technology, the dairy farming system is more perfect, the demand for dairy products in society is increasing, and dairy products have also promoted the economic development of New Zealand.

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Due to rapid economic development and the favorable natural environment in New Zealand, the demand for this product has increased among the population.

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Improved food conditions, increased nutrition, and increased social demand

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Economically, the dairy industry has a good prospect，Market stability,Dairy products as a necessity of life, People's daily nutrition and protein's supplement are also necessary.

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Because the cows can product more milk than before, and people want to reduce the quantity of cows to protect environment.
In my opinion, the food of cows had changed so they product more solid milk than before.

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Socially, New Zealanders are used to eating dairy products.
In terms of economy, New Zealand is a country riding on the sheep's back. The animal husbandry is developed, and as its derivative, the dairy industry is also developed.
Such a development trend will make New Zealand's dairy industry go abroad, strengthen import and export trade, promote the development of grass industry, and the demand for science and technology will be more urgent, in order to get more high-quality products.

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Because the natural environment is an important condition to determine the quality of dairy products in New Zealand. New Zealand has large grasslands and mild sunshine, and cows are naturally grazed.

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because the feed and services is getting better and better, while per cow could produce milk more than before, so we need less cows than before.

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New Zealand milk has good quality and large social demand, which has promoted the rapid development of the dairy industry.

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The improvement of science and technology, scientific breeding, production efficiency, output increase.

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Because the quality of cows has been improved, the milk and quality produced are both high, and the number of cows needed will decrease

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The dairy industry is an enduring industry. From an economic perspective, people are consumers of dairy products, and the benefits and impacts brought by dairy products are enormous. There are more and more people, and the demand for dairy products is only increasing without decreasing.This trend can, in a sense, lower the prices of raw materials, lower the prices of dairy products, make goods cheaper, and attract more people to purchase.

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The development of the breeding technology give the better conditions for the cows. Advanced farming techniques propelled the quality of animals forward. Sustainable environments protected because of the technological advancement also made an difference.

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From my point of view，The growth trend of milk production is due to the increasing demand for milk, the advancement of production technology, and the superior natural environment of New Zealand, which has good product quality, leading to more choices for people.

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As the number of milk per cow is increase,the function of cow is decrease and the nutrition can not followed the speed of the cows' growth,so the number of cow will decrease.

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Perhaps because some feed was imported to prolong the lactation period and these imported feed were used all year round, cows used imported feed throughout the lactation period, which increased milk production. With the development of science and technology, the breeding of high-quality breeds of dairy cows increases the milk yield of dairy cows.

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May be government policies,the improvement of technology and the situation of forreign trade.

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Improved food conditions, increased nutrition, and increased social demand

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Economic system: Dairy industry is an economic industry with good prospects for development
Ecosystem: It has a certain destructive effect on the ecology of New Zealand
Social system: It has a good effect on the whole society of New Zealand and can improve the employment rate of people

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At present, New Zealand's dairy industry has become an important pillar of national economic income, the vigorous development of New Zealand's dairy industry, inseparable from the unique natural environment and government regulation and supervision, and the company's own optimization awareness is the core of the development of New Zealand's dairy industry, according to the current trend, the future development prospects are broad.

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In the environment system, it can produce the milk is limited. So within a hectare can milk is limited, if the more milk per cow, fewer cows can alive unless to put more energy into this hectare.

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More demand will push the industry forward, but a bad global economic environment will limit it. At the same time, better technology will also improve the quality of products in this industry.

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This may be due to the improvement of New Zealand's dairy cattle breeds and technological advances. Modern farming techniques can improve the productivity and health of dairy cows and make dairy production more efficient. Sustainable grassland conservation and planning by modern farmers improves the quality of grassland pastures and may also increase dairy production.

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Because of the good feeding conditions, science and technology development getting better and better ,farm attach importane to fine breeding .What is more dairy cows eat imported feed and the importance of the government .

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economic:the cost of grass rely on large imports and compared with the previous years ,the production of dairy is decreasing.So it is good to see more milk products by per cow.
environmen: it is a problem between product and environmental protection.

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If we view diary industry as a biological industry less cows means more available space for the growth of cows and better breeding for milk.

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The larger social demand promotes the progress of breeding technology, and the ratio of feed is more reasonable, so that the cows produce more milk.

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It may be the reason for the better feed quality of the cows or the better living environment.It is also possible that the social demand for milk has become greater.

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With time going by,the trend is upward,because the economy is      developing,and people need more dairy products.

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As a biological system, dairy industry involves the integration of various plants and animals, soil science and other disciplines. The improvement and protection of environment by these technologies make dairy industry develop continuously. As an economic system, the increasing demand for dairy products at home and abroad has led to a trend of continuous growth in the dairy industry. As a social system, sociology and economic geography show that people's choices increase the demand for dairy animals.

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I think it is because people's living standard has improved since 2007 and their income has gradually increased. With the gradual rise of social economy, people's demand for high-quality food becomes higher. Meanwhile, dairy products belong to this category of food, so the trend on the chart is gradually rising.

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advancement of technology
support of government
urgent need of producers and customers

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Because the milk is the resource and the resource is plenty,the demand is less.So the cows are less

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Because the technology become better than before, famers use the advanced technology can produce more milk and just need fewer cows.

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Overall, New Zealand milk solids production increased in the ten years from 2007. From the perspective of biotechnology, because of the development of technology, people have improved the species of dairy cows, so that cows produce more milk and are less likely to get sick. From the perspective of economy, with the development of economic globalization, people's demand for high-yield and high-quality milk products makes New Zealand dairy farmers pay more attention to breeding methods, marketing methods and output.

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Because the feed is getting better and fresher, the cows are producing more milk, the milk supply is increasing, so you don't need as many cows.