دراسة تأثير إضافة مستويات مختلفة من المضاد الحيوي Chlortetracycline على معدل الاداء في دجاج اللحم

Abstract

This study is occurred to find out the affecting of adding different levels from Chlortetracycline antibiotic on drinking-water upon the performance rate of chicken’s meat. We used a number of 240 chickens from ROSS strain, and then distributed in randomly in four groups each group included 3 replicates – each replicate   consists of 20 chicks in a random manner .The first group   is Al Shahed (control) Group, the Second, Third, and Fourth groups consisted concentrations of 500 PM – 1000 PM – 1500 PM. From the Antibiotic Chlortetracycline respectively whereas the treatments   began from the first week and continued till week six.

The husbandry of all chicks were raised in a shed at Ein-Zara region \ Tripoli city as a ground husbandry from the period 15\05\2023 till 27\06\2023- the type of feed for the chickens   included 22% of Protein. This type of feed has continued for two weeks of the chicken's age, and from the third week we submitted a feed as supplement to the meat 20% protein   for all chickens, and such feed continued till the sixth age of the birds. The feeding system was free and all the chickens were treated under the same environmental conditions.

The lighting system was 24 hours of continuous lighting for fourteen days, and on the fifteenth day the lighting system was changed to 23 hours of light per hour of darkness. All birds were raised under the same natural conditions, calculation and to estimate the required characteristics.

The rates of the following traits were determined: live weight of birds, weight gain rate, the consumed of food, feed conversion efficiency and average of weekly mortality. In general, the results of this study revealed that there are no significant effect of the antibiotic Chlortetracycline (P≥0.05) on the body weight, weight gain rate, amount of consumed feed and feed conversion efficiency, and the results also revealed no significant effect on the rest of the studied traits.