chickens; ascertain the mass of non-dressed, semi-dressed, dressed carcasses and
internal organs of broiler chickens; calculate the slaughter yield of broiler chickens’
carcasses and the ratio of their internal organs to the slaughter yield. In addition, the
analysis of the pre-slaughter clinical condition of the poultry and post-mortem
inspection of the products of slaughter of broiler chickens has to be done.
Material and methods. To conduct the experiment, four groups of broiler
chickens of the Cobb 500 day-old cross-breed were formed: two control and two
experimental (12 broiler chickens each). Chickens of the first experimental group were
fed with pharmazin containing the active substance (AS) tylozine tartrate 500 mg per
1 g, and the second – with a tilotsiklinvet containing the (AS) tylozine tartrate and
doxycycline glycate of 100 mg per 1 g of powder. Pharmazin and tilotsiklinvet were
fed orally with a water at a dose of 1 g per 1 dm
3
of water according to the instructions
for their use. These antibiotics were fed to broiler chickens with preventive purpose for
the first 3 days of life, 28−29 and 38−42 days of the experiment. At the end of the
antibiotics feeding, 6 broiler chickens from each group were slaughtered at the
beginning of the elimination period (after 3 hours) and after the end of the withdrawal
period (after 5−8 days), respectively, after the last pharmazin and tilotsiklinvet usage.
In all groups the clinical status of broiler chickens, the activity of receiving food
and water was determined on a daily basis. Measurement of the microclimate
parameters in the premises was carried out according to the generally accepted methods
[11].
Antibiotic solutions were prepared daily and they were in the drinking bowls for
the first three days of life, on the 28−29 and 38−42 days of experiment. During this
period, the aqueous solution of pharmazin and tilotsiklinvet was the only source of
water supply for broiler chickens in the experimental groups, while control groups
received the main diet.
The live weight of the poultry was determined by weighing on scales of the
"Ohaus" brand by the generally accepted method (with an accuracy of ± 1 g) on the 1,
7, 14, 28, 38, 42 days of conducting the experiment. The average daily gain, the
slaughter yield of the carcasses, the mass of semi-dressed and dressed carcasses, the
mass of edible internal organs were determined according to the methodology of T.
Polivanova, 1988 [12]. Pre-slaughter and post-mortem veterinary and sanitary
examination of the slaughter products were carried out in accordance with the
requirements of the "The rules of the pre-slaughter veterinary examination of animals
and the veterinary and sanitary expert examination of meat and meat products" (2002)
[13]. The slaughter of poultry was carried out according to the established
technological instructions.
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