Antimicrobial agents

Cefuroxime

Acceptable daily intake:

The temporary ADI established at the fifty-eighth meeting of the Committee (WHO TRS 911, 2002) was withdrawn.

Residue definition:

The temporary MRL for cows' milk was withdrawn.

Chloramphenicol

Acceptable daily intake:

The Committee concluded that it is not appropriate to establish an ADI for chloramphenicol.

Residue definition:

The Committee concluded that:

There was no evidence supporting the hypothesis that chloramphenicol is synthesized naturally in detectable amounts in soil. Although this possibility is highly unlikely, data generated with modern analytical methods would be required to confirm this;

Valid analytical methods are available to monitor low levels of chloramphenicol in foods. However, confirmatory methods require sophisticated and expensive equipment.

Flumequine

Acceptable daily intake:

The Committee re-established an ADI of 0-30 µg/kg bw.

Residue definition:

Flumequine

Species

Fat
(µg/kg)

Kidney
(µg/kg)

Liver
(µg/kg)

Muscle
(µg/kg)

Cattle

1000

3000

500

500

Black tiger shrimp (P. monodon)

—

—

—

500^a

Chickens

1000

3000

500

500

Pigs

1000

3000

500

500

Sheep

1000

3000

500

500

Trout

—

—

—

500^b

^a

The MRL is temporary; the following information is requested by 2006: (1) A detailed description of a regulatory method, including its performance characteristics and validation data; (2) Information on the approved dose for treatment of black tiger shrimp and the results of residue studies conducted at the recommended dose.

^b

Muscle including normal proportions of skin.

Acceptable daily intake:

0-30 mg/kg bw (established at the fifty-fourth meeting of the Committee (WHO TRS 900, 2001))

Residue definition:

The MRLs that were recommended by the fifty-fourth (WHO TRS 900, 2001) and fifty-eighth (WHO TRS 911, 2002) meetings of the Committee were not reconsidered and were maintained.

MRLs for cattle tissues were considered but not recommended by the Committee at its present meeting.

Acceptable daily intake:

The Committee established an ADI of 0-8 µg/kg bw

Residue definition:

Pirlimycin

Species

Fat
(µg/kg)

Kidney
(µg/kg)

Liver
(µg/kg)

Milk
(µg/kg)

Muscle
(µg/kg)

Cattle

100

400

1000

100

100

^a

For the maximum residue limits for pirlimycin, the Committee noted that the analytical method submitted by the sponsor had been validated suitably, however, the mass spectrometry interface used was no longer commercially available and therefore the method would not comply with all Codex requirements for a Regulatory Analytical Method. Since the Committee received information that verification of this method using different equipment was in progress, it recommended that CCRVDF should propose the MRL for adoption by the Codex Alimentarius Commission only if this work has been completed and made available to the Working Group Methods of Analysis and Sampling in the CCRVDF.

Acceptable daily intake:

The Committee established an ADI of 0-5 µg/kg bw

Residue definition:

Cyhalothrin

Species

Fat
(µg/kg)

Kidney
(µg/kg)

Liver
(µg/kg)

Milk
(µg/kg)

Muscle
(µg/kg)

Cattle

400

20

20

30

20

Pigs

400

20

20

—

20

Sheep

400

20

50

—

20

Acceptable daily intake:

The Committee established a group ADI of 0-20 µg/kg bw for cypermethrin and alpha-cypermethrin

Residue definition:

Total of cypermethrin residues (resulting from the use of cypermethrin or alpha-cypermethrin as veterinary drugs)

Species

Fat
(µg/kg)

Kidney
(µg/kg)

Liver
(µg/kg)

Milk
(µg/kg)

Muscle
(µg/kg)

Cattle

1000

50

50

100

50

Sheep

1000

50

50

100

50

Acceptable daily intake:

0-1 µg/kg bw (established at the fifty-eighth meeting of the Committee (WHO TRS 911, 2002))

Residue definition:

Doramectin

Species

Milk (µg/kg)

Cattle

15^a

^a

The Committee noted that (1) on the basis of the MRL of 15 µg/kg for doramectin in whole milk from cows, the milk-discard times would be approximately 240 h, according to studies using the pour-on treatment. Milk discard times would be approximately 480 h after treatment with doramectin the dose formulated for injection; (2) in milk containing 4% milk fat, the residues in milk fat would be equivalent to 375 µg/kg (15 µg/kg ÷ 0.04 = 375 µg/kg). This is higher than the MRL of 150 µg/kg in fat tissue; (3) the discard time necessary to accommodate the recommended MRL in milk is unlikely to be consistent with good veterinary practice.

Acceptable daily intake:

0-4 µg/kg bw (established at the fifty-second meeting of the Committee (WHO TRS 893, 2000))

Residue definition:

The MRLs for sheep, pigs and goats that were recommended by the Committee at its fifty-eighth meeting (WHO TRS 911, 2002) were not reconsidered and were maintained.

The temporary MRLs for cattle that were recommended by the Committee at its fifty-second (WHO TRS 893, 2000) and fifty-eighth (WHO TRS 911, 2002) meetings were withdrawn.

Acceptable daily intake:

0-0.03 µg/kg bw (established at the fifty-fourth meeting of the Committee (WHO TRS 900, 2001)

Residue definition:

Melengestrol acetate

Species

Fat (µg/kg)

Liver (µg/kg)

Cattle

8

5

Acceptable daily intake:

The Committee established an ADI of 0-1 µg/kg bw

Residue definition:

Ractopamine

Species

Fat
(µg/kg)

Kidney
(µg/kg)

Liver
(µg/kg)

Muscle
(µg/kg)

Cattle

10

90

40

10

Pigs

10

90

40

10