Antibiotics

It is no secret that many people are concerned about the use of antibiotics in our food production. Often people will try to avoid consuming them by purchasing food with “raised without antibiotics” labels. Is it worth paying extra for these labels? Are there really antibiotics in our food? Is overuse of antibiotics an issue? This blog will try to address those questions!

Are there antibiotics in my meat and milk? The answer to this questions is NO! It is illegal for meat or milk to contain any antibiotics. While antibiotics can be administered to animals being raised for food, the FDA requires all meat and milk to be antibiotic free when sold for consumption. This is done by requiring a very strict withdrawal time before meat can be harvested (slaughter) or milk can be collected from an animal that has been given antibiotics.

This is especially true in milk. When a dairy farmer has to give a sick cow antibiotics, the dairy farmer must dump the milk from that cow down the drain for a select number of days until the antibiotics inside the cow are through its system. Milk is tested before it is taken from the farmer and if any antibiotics are found in the milk, the whole load must be dumped down the drain. (Click here to learn more here)

wpid-20130203_192005

The lesson to be learned is that by the time you eat milk or meat, any residues of antibiotics that may or may not have been there will be long gone! Farmers are lawfully bound to this practice.

How are antibiotics used in the livestock industry? Antibiotics and vaccines are used throughout the livestock industry to prevent animals from getting sick (preventative) and help the ones who do get sick recover (therapeutic) and to promote healthy growth (sub-therapeutic).

Therapeutic: Licensed veterinarians give farmers recommendations on what to give sick animals. Not using antibiotics on an animal that gets sick increases the suffering of the animal and is inhumane. Animals are never “pumped full” of antibiotics.  Only a few milliliters (5-10) are given to each animal, which is less in comparison to that of humans in relation to overall body weight. A single bottle of antibiotics can cost hundreds or even thousands of dollars (the bottle of Draxxin pictured below was around $2,000) and a livestock farmer would be stupid to use more than he has to. A single bottle can doctor up to 100 animals.

12063701_988560894499434_7515989755588026707_n

Preventative and Sub-Therapeutic: Cattle are sometimes vaccinated when moved to a new place in order to prevent sickness. Cattle can also in certain situations be given feed additives. Our friend Ryan Goodman does a great job of describing those here: Feed Additives and Ionophores

Antimicrobials and sub-therapeutic antibiotics are used throughout the poultry and swine industries. These are low dose antibiotics given through feed that improve growth efficiency, prevent illness, and even prevent food-borne illnesses.

In all of these cases, doses are given at incredibly low amounts. However, there is room for concern with these practices, and farmers and scientists alike are looking for answers and solutions.

Is antibiotic use in animals causing resistance in humans? Most antibiotic use in livestock farming deals with different antibiotics than what are used in humans. However, antibiotic resistance is developing in both humans and animals. In both cases, overprescribing antibiotics is contributing to the issue. Farmers, veterinarians, and human doctors should be aware of this issue and be working to find solutions and using antibiotics in a responsible manner. (Read more here)

If some farms can raise animals without using antibiotics, why can’t all? The “raised without antibiotics” label is somewhat misleading. Even on farms that attempt to raise animals without antibiotics, animals get sick. Just like humans, certain animals are more prone to sickness than others. Antibiotics are still given to animals on these farms, but are pulled from the “raised without antibiotics” herd and sold as conventional meat or dairy. At this point, there is no way all of our animals can be raised without antibiotics. At best, “raised without antibiotics” is a specialty product for now. In order to raise enough animals to meet consumer demand, antibiotics must be used to keep animals healthy.

 

 

Hormones

It is no secret that many people are concerned about the use of hormones in our food production. Often people will try to avoid consuming them by purchasing food with “hormone free” labels. Is it worth paying extra for these labels? Are there really hormones in our food? This blog will try to address those questions!

Are there hormones in my meat and milk? Meat and milk (and most food including plants) are never “hormone free.” All humans and animals (Cattle, Pigs, Chickens, Turkeys, etc.) produce hormones naturally. There will always be hormones in the food you eat and in your body.

Hormones can be given to animals in certain types of livestock production which we will explain below. If food has been raised without any added hormones in production, the correct label should be “no hormones added.” A “hormone free” label is wrong and misleading.

However, the thing to remember is that hormones (whether natural or added) are not dangerous to consume at the levels found in your food. We will explain that below.

Are added hormones used in livestock production?

  • Hormones are never added or used to raise pork and poultry products! It is illegal to add hormones in pork and poultry production and a label stating no hormones or no hormones added on pork or poultry products is meaningless. You do not have to worry about hormones at all with pork and poultry. The reason pigs and chickens are so much bigger and grow so much faster all has to do with breeding techniques. Learn more here: Why Do Chickens Grow So Large So Quickly?
  • Hormones can be used in beef and dairy production.

How do hormones work in beef and dairy?  Hormones are given in a form of an “implant” to beef and dairy cattle. In beef, hormones such as estrogens or androgens are often administered to growing cattle to promote growth by complementing the effects of naturally occurring hormones. (Learn more at: Igrow) In dairy, the most common hormone used is rBGH. Hormones improve the efficiency of an animal to grow or produce milk and using them can help improve sustainability because it takes less water, feed, land, and time to raise the same amount of food.

How much hormones are added in beef and dairy production? The amount of hormones given to these animals is incredibly small. Below is an example of an implant administered to beef cattle to help them grow efficiently. It is the size of a tic tac (picture below).

2014-04-04-img2012082000922
(Photo from Ryan Goodman)

Will the added hormones in beef and dairy affect my health?

Beef: A common myth surrounding beef produced with additional hormones is that it is unsafe to consume. The fact is that the U.S. Food and Drug Administration regulates the development and use of hormone implants and the Food Safety Inspection Service of the USDA routinely monitors residues of synthetic hormones in meat. It is true that beef from hormone-implanted cattle has increased estrogenic activity compared with non-implanted beef. This fact alone may alarm beef consumers but it must be put into the context of actual amount consumed and the levels found in other products. As shown in Table 1., beef from a non-implanted steer contains .85 units of estrogenic activity per 3 oz. serving, while beef from an implanted steer contains 1.2 units of estrogenic activity in the same serving. However, this amount is a fraction of what is found in many other common foods. For example the same quantity of eggs would provide 94 units of estrogenic activity and a 3 oz. serving of tofu would provide 19,306,004 units of estrogenic activity. In fact, a normal adult male produces 136,000 ng of estrogen per day while a non-pregnant women produces 513,000 ng/day on average, making consumption of the levels of estrogen in implanted beef relatively inconsequential.

Table 1. Estrogenic activity of common foods (ng/3 oz serving)1

Food Estrogenic Activity
Soy flour (defatted) 128,423,201
Tofu 19,306,004
Pinto beans 153,087
White bread 51,029
Peanuts 17,010
Eggs 94
Milk 5.4
Beef from implanted steer 1.2
Beef from non-implanted steer .85
1Units are nanograms of estrone plus estradiol for animal products and isoflavins for plant products per 3 oz of food.
Hoffman and Eversol (1986), Hartman et al. (1998), Shore and Shemesh (2003), USDA-ARS (2002). Adapted from: Loy, 2011

– See more at: http://igrow.org/livestock/beef/hormones-in-beef-myth-vs.-fact/#sthash.HRt0iFvV.dpuf

For a simpler picture of hormone levels in beef, check out this picture. The added hormones in beef are a fraction of the naturally occurring hormones in other food items and humans. Whether naturally occurring or added, these levels of hormones are all safe to consume in humans! These levels are similar in milk. (More: M&Ms)

horomone-levels

Dairy: Only 15% of dairy farmers use any sort of growth hormones in their cows. Most milk you find in the grocery store will have a “no hormones added” label. Bovine somatotropin (also called bovine growth hormone or rBGH) is perhaps the most well recognized growth hormone used on dairy farms. bST is “a protein hormone produced in the pituitary gland of animals, including humans, and is essential for normal growth, development, and health maintenance.” Very little bST is used in dairy cows and there is no test that can distinguish between cows treated with bST and naturally occurring bST (3). Humans do not have receptors for bST and therefore it is passed through your body intact without being absorbed (4). As a result, there are no known side effects or health issues associated with consuming dairy from cows treated with bST. (Source)

Here is a write-up on the differences in hormone levels in milk produced with rBST, milk produced without rBST, organic milk, and raw milk:  http://igrow.org/livestock/dairy/hormones-whats-in-your-milk/