Improving feed efficiency to raise healthier pigs with fewer resources


October 19, 2021

ARTICLE

By 2050, the world’s population is expected to double and the demand for protein is expected to dramatically increase. Sustainable food production is critical to feeding people across the world with nutritionally important protein — something Smithfield Foods is taking to heart as the largest hog producer in the U.S.

Smithfield Foods is continually researching how to produce high-quality, high-protein products that require fewer resources and have a smaller environmental footprint. Thanks to advancements in technology, Smithfield Foods identified feed efficiency as an area ripe for continued sustainability improvements, as Smithfield Foods’ hogs consume more than 10 billion pounds of feed every year.

Due to efforts like their feed efficiency program, the hogs Smithfield Foods raises today require fewer resources to raise than they once did. The company achieved this through genetic improvements, modifying the feed form, and using feed additives.

Understanding feed efficiency

Pig feed represents the largest cost of raising a pig to market. Feed efficiency efforts allow Smithfield Foods to achieve the highest return possible for each pound of feed. One way to measure feed efficiency is by ‘feed conversion ratio’ — or pounds of feed consumed per pound of body weight gained.

Improving feed efficiency demonstrates sustainable usage of grains and protein utilized in swine diets, which are formulated by nutritionists and are nutritionally optimized for their health.
There are several factors that contribute to improved feed efficiency. Even incremental improvements in feed efficiency can decrease overall waste and improve manure management, which further supports sustainability and productivity.

Genetic improvements for efficient pig rearing

Targeted efforts by Smithfield Foods’ geneticists identify characteristics that enable the company to raise animals more efficiently. For example, some humans gain weight more easily than others, which is the result of the genes they inherited. Smithfield Foods seeks to produce hogs that gain weight more easily because hogs that convert calories more efficiently require fewer resources — and less time — to grow from infancy to market weight.

The swine genome became available in 2009 and has allowed for the advancement of marker-assisted selection. The primary tool Smithfield Foods uses to increase accuracy in its genetic selection program is the use of special DNA microarrays called SNP panels.

These panels help geneticists identify which pigs have single nucleotide polymorphisms (SNPs) at unique locations within the genetic architecture of the animal testing. Using statistical models and bioinformatics, geneticists can estimate the value each of these markers contributes to economically important traits, including feed efficiency.

From this data, geneticists can identify and screen animals that will contribute germplasm to the next generation. It typically takes three to four years for Smithfield Foods to realize the increased genetic potential from the animals on its farms.

Modifying the feed form

A contributing factor to improved feed efficiency is modifying the pig’s feed form, meaning the particle size of the feed.

Typically, feed is either made by grinding the corn to fine particles and pelleting or by grinding the corn to large particles and feeding a mash form. To feed diets in a pelleted form, grain is ground into smaller microns (300-400) compared to diets fed in a meal form (> 600 microns).

The benefit for feeding nursery, growing, and finishing pigs a pelleted diet is an improvement of 4-8% in both average daily gain (ADG) and feed efficiency compared to the same diets in meal form. The improvements are due to enhanced palatability, reduced waste, and the potential for improved nutrient utilization due to the heat treatment of the ingredients.
Since cereal grains can be ground finely, thereby increasing the surface area of the grain, and can be included in a pelleted diet without flowability concerns, feed efficiency can be further improved compared to a meal diet containing larger-sized particles.

Using feed additives

The use of feed additives can contribute to both the profitability and sustainability of swine production. Most feed additives have a dual purpose:

  1. Many feed additives contribute to animal welfare and environmental sustainability.
  2. They also contribute to profitability by reducing the overall cost of hog production and general return on investment.

Smithfield Foods carefully researches and evaluates feed additives that improve profitability, animal health, and the sustainability of swine production. A few examples include the enzyme Phytase, the enzyme Xylanase, and natural organic acids.

Use of the enzyme Phytase

The use of phytase is economically important and reduces ration costs by making phosphorus in the pig’s diet that is normally “trapped” freely available for the pig to digest. This reduces the amount of inorganic phosphorus needed to meet the pig’s phosphorus requirement.

Phytase use can also make other nutrients in the diet more available by eliminating the negative effects of phytic acid (the “trapped” or unavailable from phosphorus found in the diet). When pigs can utilize more nutrients, less need to be provided, increasing sustainability and efficiency. Additionally, improved utilization reduces the nutrient content in the resulting manure, lowering the amount found in stored waste and therefore emissions.

Use of the enzyme Xylanase for improved gut health

Xylanase breaks down natural fibers in a pig’s diet and produces many beneficial “prebiotic” fractions.

These fractions can improve herd health by helping to improve the microbial balance in the digestive tract and can potentially reduce the need for antibiotics to treat gut-level disease challenges. Smithfield Foods’ research teams have documented this health benefit.

Natural organic acids for piglet diets

Natural organic acids can be added to nursery feeds to help piglets adapt to adult diets. Dietary addition of organic acids like lactic acid (think fermented dairy products) can help the weaned piglets better digest their diets and help prevent digestive level challenges as well.

This can help the piglet welfare at weaning, minimize gut-level health issues and improve profitability. These are all positive factors for improving the long-term sustainability of swine production.

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