Chix on Antibiotics. Can you eat the eggs?

[Heartwood]

Hi. Unfortunately, we felt we had to give the chickens antibiotics. They were dying of some kind of intestinal disease--undiagnosed as no vet around, but not wormy apparently. So here we are in the heart of the best egg laying season and I'm worried about eating the eggs. Any expert advice out there? The package says "Not for poultry laying eggs for human consumption." and then goes on about how to dose chickens--I don't know if I'd want to eat the meat either--if they say not to eat the eggs. This is our first time in this pickle--so please advise. Thanks everyone!

 

[jennh]

What are you using? Sometimes they say to wait a week or two for it to get out of their system.

Jen

 

[Heartwood]

It's a type of tetracycline.

 

[speckledhen]

What are the symptoms? How old are they? Could it be coccidiosis? If so, tetracycline will do nothing at all. Don't eat the eggs for at least two weeks after antibiotics, but you may be using the wrong thing for the ailment anyway.

 

[Heartwood]

Hi. I looked at the symptoms of coccidiosis and there is no blood in the droppings so we ruled that out. I can understand not eating the eggs while on antibiotics but do you know why you'd have to wait another 2 weeks? Thanks for taking your time to share your thoughts.

 

[mamarosa]

The anitbiotics stay in the chicken (animal) for time after the initial injestion of the antibiotics
I have read that you can give the eggs scrambled back to the chickens for some added protein
if you feel bad just throwing them away. This is why our society is so antibiotic resistant
with all the antibiotics that are given to animals today. I have one sick isa brown and I started her
on tetracycline last night for green-brown foul liquid stool. she looks pretty sad hope this helps

 

[Heartwood]

Here's a paper I found on this subject.

Antibiotic Residues In Poultry Tissues and Eggs: Human Health Concerns?
Dan J. Donoghue1
Department of Poultry Science, University of Arkansas, Fayetteville, Arkansas 72701
ABSTRACT Antibiotics are used by the poultry industry
to enhance the health and productivity of flocks. The
use of antimicrobials is strictly regulated by the Food and
Drug Administration (FDA) and the USDA to warrant
their safety and efficacy. Prior to regulatory approval, the
pharmacokinetics and tissue tolerances of an antimicrobial
are determined to set the proper dosage. To ensure
proper use, both the FDA and USDA have research, surveillance,
and compliance programs to develop detection
(Key words: antibiotic residue, poultry, egg, safety)
2003 Poultry Science 82:618–621
INTRODUCTION
Antibiotics are used by the poultry industry and poultry
veterinarians to enhance growth and feed efficiency
and reduce disease. Antibiotic usage has facilitated the
efficient production of poultry, allowing the consumer to
purchase, at a reasonable cost, high quality meat and
eggs. Antibiotic usage has also enhanced the health and
well-being of poultry by reducing the incidence of disease.
Although these uses benefit all involved, unfortunately,
consumer perceptions are that edible poultry tissues
are contaminated with harmful concentrations of
drug residues. In a recent consumer survey, Resurreccion
and Galvez (1999) reported that 77% of consumers responding
considered animal drug residues in meats to
be an extreme health concern (Figure 1). Only 23% responding
thought that drug residues were not a problem.
These perceptions are supported by popular media including
the recent article by Gaskill (2002) recommending
“organic produce and chicken, because of the hormones
and antibiotics conventional producers use.” These comments
were published in the in-flight magazine (AmericanWay)
for American Airlines. Although antibiotics are
approved for use in poultry, there is extensive regulatory
oversight to ensure the safety of our foods (see following
section). Furthermore, hormones are not approved for
use in poultry, are illegal to use, and are closely monitored
2003 Poultry Science Association, Inc.
Received for publication September 26, 2002.
Accepted for publication December 2, 2002.
1Towhomcorrespondence should be addressed: [email protected].
Abbreviation Key: FDA = Food and Drug Administration; NOEL =
no observable effect level.
618
methods and monitor poultry tissues for antimicrobials.
Unfortunately, there is the perception among many consumers
that our food supply contains high concentrations
of drug or hormone residues causing significant health
concerns or problems. In fact, foods produced in this
country (including poultry) are very safe and meet the
highest standards to exclude chemical contaminants. An
overview will be presented on the federal oversight and
monitoring of antimicrobial residues in poultry tissues.
by the federal government to ensure they are not used
in poultry.
DRUG APPROVAL PROCESS
The use of antibiotics is strictly regulated by the Food
and Drug Administration (FDA) and the USDA. The FDA
is the regulatory agency responsible for approval of antibiotic
usage in poultry. Once approved, both the FDA
and its sister agency, the USDA, have active surveillance
and compliance programs to ensure the proper use of
antibiotics and the safety of the food supply. The authority
to approve drugs (including antibiotics) is granted to
the FDA by the Federal Food Drug and Cosmetic Act
(1958). As part of this law, the FDA is mandated to ensure
the safety and efficacy of drugs prior to approval. The
burden of proof to demonstrate safety and efficacy is on
the sponsor (usually a pharmaceutical company) and not
the FDA. The sponsor is required, with FDA input, to
perform scientific research to meet the regulatory standards
for drug approval. The FDA’s role is to provide
input and proper guidance and evaluate the safety and
efficacy data to determine the suitability for drug approval.
From a safety standpoint, extensive toxicology
and pharmacology studies are required to demonstrate
consumers will not be exposed to harmful concentrations
of antibiotic residues in edible poultry tissues.
PREAPPROVAL REQUIREMENTS
Prior to approval, the FDA requires several different
types of toxicology and pharmacology studies to access
the safety of antibiotics in edible tissues (see www.fda.-
gov/cvm/guidance/published.htm for specific requireSYMPOSIUM:
USE OF ANTIMICROBIALS IN PRODUCTION 619
FIGURE 1. Consumer survey: concern about potential food contamination
in meat. Reprinted with permission from Food Technology (Resurreccion
and Galvez, 1999). [AUTH QUERY: Please provide copyright
permissions to the PSA editorial office]
ments). The types of toxicology tests required will depend
upon the knowledge and history of use for specific antibiotics.
For example, requests to use an antibiotic in broilers,
which has a history of safe use in other food-producing
animals, will probably require less extensive toxicology
testing. For a newer, untested antibiotic, however, extensive
safety testing will have to be performed. Thus, the
drug approval process can vary for different antibiotics.
There are general guidelines, however, followed for all
drug approvals.
For toxicology testing, the sponsor has to perform acute
and chronic dosing studies. The acute studies evaluate
animals for problems such as allergic reactions, whereas
long-term chronic studies identify if problems such as
cancer are associated with a particular drug. These studies
will determine a dose that does not create any health
problems. This is called no observable effect level (NOEL)
and is the antibiotic dose at which no adverse effect on
an animal’s health can be observed. Once established, this
information is used to calculate a tolerance concentration
for the antibiotic in edible tissue. This is accomplished
by taking the antibiotic dose at the NOEL, reducing this
dose by 100- or 1,000-fold (safety factor), and multiplying
by the average daily intake of the edible tissue (e.g., poultry
muscle) for a 60-kg adult. A safety factor of 100 is
usually used for antibiotics already in use (e.g., other
animals, humans) with a known safety record. Otherwise,
a safety factor of 1,000 is used.
Tolerance = NOEL (dose, no observable effect)
× safety factor (100 or 1,000 times less
than the NOEL dose)
× ADI (average daily intake) × 60-kg adult
Once an antibiotic is approved for use, the tolerance is
published in the U.S. Code of Federal Regulations. Thus,
a person eating a chicken breast from an antibiotic-treated
chicken would, at most, consume a dose of antibiotic of
100- or 1,000-fold less than the dose demonstrating no
health effects. In other words, based on sound scientific
research, the chicken or eggs we consume are extremely
safe with respect to residues.
FIGURE 2. Theoretical depletion of antibiotic residues in edible poultry
tissue.
Once the tolerance is established for an antibiotic, the
FDA requires the sponsor to perform pharmacokinetic
studies to ensure the tolerance is not exceeded for the
proposed dosing, according to label directions. Usually,
a C14radiolabeled-antibiotic depletion study is conducted
by the sponsor (www.fda.gov/cvm/guidance/published.
htm). Following dosing, edible poultry tissues are
evaluated at different time points to determine when total
residue concentrations decrease below the tolerance. A
theoretical example of a depletion study is depicted in
Figure 2. In this theoretical example, a tolerance of 0.3
ppm has been established in poultry muscle (as described
previously). Following oral dosing of chickens, total
C14radiolabeled antibiotic residues exceed the tolerance
during the dosing and the first day of drug withdrawal.
By the second day of drug withdrawal, however, the
residues in edible tissues are lower than the tolerance.
Therefore, the FDA would only approve use of this antibiotic
with at least a 2-d withdrawal period. Thus, when
the antibiotic is used according to label directions, poultry
tissues should not contain harmful residues.
POSTAPPROVAL DRUG MONITORING
Although the FDA requires extensive scientific studies
to ensure the safe use of antibiotics by the animal industry,
there is the possibility that inappropriate use of antibiotics
could cause harmful residues. Inappropriate use could
be due to unintentional misuse (not following label directions)
or intentional, illegal usage. To guard against these
possibilities, both the FDA and USDA have active postapproval
monitoring programs for our food supply. This
extensive effort requires collection and analysis of samples
by field scientists throughout the country. Tissue
samples are analyzed for numerous analytes (including
antibiotics) to determine if they exceed established tolerances.
If a violation is determined, corrective action is
taken to prevent recurrence. Usually, violations are due
to simple misuse (not following label directions), and
education corrects these problems. However, enforce620
DONOGHUE
TABLE 1. U.S. Food Safety Inspection Service (FSIS) national
antibiotic residue monitoring results (1997 to 2000)1
Violations Violations Violations Violations
1997 1998 1999 2000
Production class (%) (%) (%) (%)
Young chickens 0.0 0.0 0.0 0.2
Mature chickens 0.0 0.0 0.0 0.4
Young turkeys 0.0 0.0 0.2 0.0
Mature turkeys 0.0 0.0 0.0 0.0
Ducks 0.0 0.0 0.0 0.0
1Website: www.fsis.usda.gov/ophs/red2000/index.htm.
ment can include legal remedies including criminal prosecution
and incarceration. Thus, violations are taken very
seriously by the regulatory authorities.
DEVELOPMENT OF METHODS FOR
RESIDUE MONITORING
During the preapproval process, the FDA requires the
sponsor to develop an official analytical method to test
for residue concentrations in edible tissues. These methods
can be used by the FDA or USDA to test for violative
residue levels of antibiotic in poultry tissues. The FDA
cannot, however, require sponsors to develop testing
methods for antibiotics (or other drugs) in tissues that
are not part of the drug claim. For example, the FDA
cannot require a method for enrofloxacin in eggs when
the sponsor only requests approval for use in meat-type
broilers. Thus, the burden to develop methods to detect
antibiotic residues in edible tissues for off-label uses falls
on the federal government.
Extensive federal resources are dedicated to development
of monitoring methods and research pertaining to
the pharmacokinetics of antibiotics in edible animal tissues
(including poultry). Results of these efforts allow
the federal government to monitor antibiotic residues in
tissues for label and off-label usage. There are numerous
research scientists at the FDA and USDA involved in
these efforts, some of which include the laboratories of
the FDA, Center for Veterinary Medicine (Laurel, MD),
Office of Regulatory Affairs (e.g., Atlanta, GA; Denver,
CO) and USDA/ARS, Microbial Biophysics and Residue
Chemistry (Wyndmoor, PA), and Animal Metabolism
Agricultural Chemical Research Unit (Fargo, ND).
In addition, veterinary or pharmacokinetic programs
at numerous universities or private research facilities also
provide research in support of the federal monitoring
effort. An example of the extensive effort on the part
of the federal government and universities include the
author’s collaborative research with federal scientists.
These collaborations have produced pharmacokinetic
models for antibiotic and pesticide transfer into poultry
(Donoghue et al., 1996a,b, 1997a,b; Donoghue and Hairston,
2000; Donoghue and Myers, 2000; Donoghue, 2001)
and analytical methods for detection of antibiotic (e.g.,
tetracyclines, sulfonamides, floroquinolones, chloramphenicol)
and pesticide (e.g., organochlorine, organophosphorus)
residues in poultry (Pensabene et al., 1998;
Cohen et al., 1999; Donoghue and Hairston, 1999; Fiddler
et al., 1999; Maxwell et al., 1999; Pensabene et al., 1999;
Shaikh et al., 1999; Chu et al., 2000; Pensabene et al., 2000;
Schenck and Donoghue, 2000; Schneider and Donoghue,
2000, 2001; Lehotay et al., 2001; Heller et al., 2002).
U.S. RESIDUE MONITORING RESULTS
FOR POULTRY
Data from the federal monitoring program contradict
the perception held by many consumers that harmful
antibiotic residues are abundant in meats (including poultry,
Figure 1). The most recent 4 yr of monitoring results
from the USDA (1997 to 2000) indicate that few if any
violative (exceeding tolerances) levels of antibiotics were
detected in poultry tissues (Table 1; www.fsis.usda.gov/
ophs/red2000/index.htm). In both 1997 and 1998, no violative
residue levels were detected. In 1999 and 2000, only
0.2, 0.2, and 0.4% of the samples had violative residues
in young turkeys, young chickens, and mature chickens,
respectively. These levels of violative residues would not
realistically support most consumer perceptions that edible
meats contain residues that pose extreme health concerns
(Resurreccion and Galvez, 1999). Furthermore, it
must be remembered that violative levels of antibiotics
in poultry do not necessarily mean they are harmful. This
is because the FDA requires the tolerance to be 100- to
1,000-fold below the dose of the antibiotic at which there
are no health effects (NOEL). Thus, the safety factor required
by the FDA ensures that residues exceeding the
tolerance even by as much as 100-fold in edible poultry
are still safe to consume.
Conclusions
Both the FDA and USDA provide extensive regulatory
oversight to ensure the safety of our food supply. This
includes mandatory and rigorous safety (toxicology and
pharmacokinetic) studies prior to the approval of an antibiotic
for use and monitoring of the food supply to ensure
the antibiotic is being used correctly. Furthermore, the
federal government, universities, and private research
facilities conduct research that allows for monitoring of
antibiotics that may be used illegally. Federal monitoring
of the U.S. food supply reveals few, if any, violative antibiotic
residues in poultry tissues. The intensive efforts of
the U.S. government, state agencies (e.g., universities),
SYMPOSIUM: USE OF ANTIMICROBIALS IN PRODUCTION 621
and the private sector (e.g., pharmaceutical companies)
have arguably produced the safest food supply in the
world.
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Chu, P., D. J. Donoghue, and B. Shaikh. 2000. Determination of
total 14C residues of sarafloxacin in eggs of laying hens. J.
Agric. Food Chem. 48:6409–6411.
Cohen, E., R. J. Maxwell, and D. J. Donoghue. 1999. Automated
multi-residue isolation of fluoroquinolone antimicrobials
from fortified and incurred chicken liver using on-line microdialysis
and HPLC with programmable fluorescence detection.
J. Chromatogr. B 724:137–145.
Donoghue, D. J. 2001. Mechanisms regulating drug and pesticide
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Donoghue, D. J., H. Hairston, C. Cope, M. Bartholomew, and
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[Heartwood]

I thought about scrambling them and giving the eggs back to the hens--but wondered if I'd be double dosing them?

 

[ephrona]

If you have injected antibiotics into chickens, it is recommended that you do not eat such eggs, which may make your body resistant to drugs.