الفهرس 
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Abstract
Residues of veterinary drugs in poultry meat have bad health effects on
humans (e.g., increase antibacterial resistance, hypersensitivity, carcinogenicity
and mutagenicity) which make the control of veterinary drug uses and residues
an important goal to insure consumer protection. This study was performed to
determine erythromycin residues, tilmicosin residues and the effect of l.carnitine
on erythromycin and tilmicosin residues in different tissues of chickens (liver,
kidney and breast muscle) and plasma following multiple oral doses of the drugs
using microbiological assay.
The experiment was conducted on 48 chickens, they were randomly
allocated into four equal groups; 1-group A (n=12) was orally administrated 4
gm /litter drinking water erythromycin for 5 consecutive days. Samples ( liver,
kidney and breast muscle and plasma) were collected daily from each
slaughtered bird at 1
st
, 2
nd
and 3
rd
day after 24 h following the last oral dose, 2-group B (n=12) was orally administrated 4 gm /litter drinking water
erythromycin for 5 consecutive days and 162.5 mg /2 litter drinking water
l.carnitine for 2 consecutive days. Samples (liver, kidney and breast muscle and
plasma) were collected daily from each slaughtered bird at 1
st
, 2
nd
and 3
rd
day
after 24 h following the last oral dose, 3- group C (n=12) was orally
administrated 1 ml /litter drinking water tilmicosin for 5 consecutive days.
Samples (liver, kidney and breast muscle and plasma) were collected daily from
each slaughtered bird at 1
st
, 2
nd
and 3
rd
day after 24 h following the last oral
dose, 2- group D (n=12) was orally administrated 1 ml /litter drinking water
tilmicosin for 5 consecutive days and 162.5 mg /2 litter drinking water
l.carnitine for 2 consecutive days. Samples (liv.