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Animal feed

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Animal feed refers to the food provided to domestic animals, specifically livestock, during animal husbandry. This practice is a fundamental part of animal agriculture. In many cases, feed represents the primary cost for raising or keeping animals.

Feedlot-1
Feedlot-1

To manage these costs, farmers use various strategies. They might grow their own crops or allow animals to graze on natural pastures. Some also use inexpensive substitutes, such as food waste from other industries. An example is spent grain, which is a byproduct of beer brewing.

There are two basic categories of animal food: forage and fodder. Forage is what animals find and eat for themselves, such as grass in a pasture.

Maasai man with cattle
Maasai man with cattle

Fodder refers to food that is cut and carried to the animals. This category includes hay, straw, and silage. It also encompasses compressed or pelleted feeds, oils, and mixed rations. Sprouted grains and legumes are another part of fodder. Globally, grass and crop residues serve as the most important sources of animal feed.

Farmers often use compound feed to meet specific nutritional needs. This is a type of fodder made by blending various raw materials and additives. Feed compounders manufacture these blends in several forms, such as meals, pellets, or crumbles. The main ingredients are usually feed grains like corn, soybeans, sorghum, oats, or barley. To ensure a balanced diet, producers often add premixes to the blend. Premixes are mixtures of microingredients, including vitamins, minerals, chemical preservatives, and antibiotics.

Cows eating TMR
Cows eating TMR

These are often purchased from specialized companies in sacked form.

Different species require different amounts of grain to produce meat. According to the FAO, ruminants need an average of 2.8 kg of grain to produce 1 kg of meat. In contrast, monogastrics require about 3.2 kg. These numbers can change drastically depending on the production system. In beef feedlots, the ratio can reach as high as 9.4 kg of grain per 1 kg of meat. Conversely, extensive ruminant systems may use only 0.1 kg.

share cereals animal feed, World, 2022 (cropped)
share cereals animal feed, World, 2022 (cropped)

Grain accounts for 11% of the total dry matter consumed by livestock globally. Oilseed by-products, such as soybean cakes, account for another 5%.

Historically, governments have stepped in to regulate what animals eat. In 1996, the United States passed the Animal Drug Availability Act. This was the first attempt in the U.S. to regulate medicated feed. In 1997, the U.S. and Canada banned certain animal tissues from cattle feed. This action followed outbreaks of Bovine spongiform encephalopathy, known as mad cow disease. Later, in 2007 and 2009, Canada and the United States expanded these bans. These rules prohibited the use of potentially infectious tissue in all animal and pet food, as well as in fertilizers.

Feeding practices have significant impacts on the environment and animal health. Modern practices, like fattening cows in feedlots on grains, can have detrimental effects. For example, high amounts of corn can make a cow's microbiome more acidic. This weakens their immune systems and makes them more likely to carry E. coli. However, other methods can help the planet. Feeding cows certain types of seaweed can reduce their production of methane, a greenhouse gas.

Bush-based animal feed
Bush-based animal feed

In Namibia, researchers have studied harvesting woody shrubs to use as feed during droughts.

Agriculture for animal feed also creates pressure on global land use. Feed crops require land that could otherwise be used to grow food for humans. This can lead to deforestation, soil degradation, and climate change. Environmental crises like droughts also impact the industry. A 2017 drought in Senegal reduced grazing lands and caused the price of manufactured feed to skyrocket. This forced many farmers to sell large portions of their herds. The feed industry remains a massive economic force, with the American Feed Industry Association noting that as much as $20 billion in ingredients are purchased annually.

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File:Feedlot-1.jpg
Feedlot-1.jpg
File:share cereals animal feed, World, 2022 (cropped).svg
share cereals animal feed, World, 2022...
File:Bush-based_animal_feed.jpg
Bush-based_animal_feed.jpg
File:Cows_eating_TMR.JPG
Cows_eating_TMR.JPG
File:Maasai man with cattle.jpg
Maasai man with cattle.jpg
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