the effect of feeding barley-based diets (%60) supplemented with four commercial enzymes containing xylanase and ?-glucanase activities were investigated on performance and gastrointestinal size of broiler chicks. the enzyme supplemented diets were compared with unsupplemented barley- or corn-based diets. a total of 234-day-old male broiler chicks (ross 308) were allocated to 6 treatment groups...

The objective of this study was to determine the effect of different levels of chicory root and stem powder (CRSP) and butyric acid (BA) combination on the performance, carcass traits, relative weight of internal organs and some blood parameters in broiler chickens. Two hundred and forty one-day-old broilers (Ross 308) were used in a completely randomized design with four treatments with six re...

Bacteriophages are viruses that can infect and kill bacteria. Three studies were conducted to determine the efficacy of bacteriophage to prevent an Escherichia coli respiratory infection in broiler chickens. In the first study 3-d-old-birds were challenged with an air sac inoculation of 10(3) cfu of E. coli per mL mixed with either 10(3) or 10(6) pfu of bacteriophage, or 10(4) cfu E. coli mixed...

This experiment was undertaken to evaluate the effect of dietary level of artichoke (Cynara scolymus) on growth performance and immune response of broilers under heat stress (HS). Two hundred forty day-old broiler chicks (Ross, 308) were randomly assigned to one of four dietary treatments with four replicate pens per treatment (15 birds per pen) in a completely randomized design with a 2 × 4 fa...

All procedures of our experiments were approved by the animal care and welfare committee of the Institute of Animal Science of Chinese Academy of Agricultural Sciences. Two dose-response experiments were conducted to assess the bioefficacy and toxicity of DL-methionine hydroxy analog free acid (MHA-FA) relative to DL-methionine (DLM) in White Pekin ducks. In experiment 1, the methionine-deficie...

The present study was carried out to examine the effect of supplemental dietary valine in the starter diet of broilers (0-15 d of age) on performance, antibodyresponse to Newcastle disease virus vaccination and bone mineralization. The experiment was conducted using 300 Ross 308 male broilers. One-day-old chicks were randomly allotted to 3 groups; each group consisted of 5 replicate pens with 2...

This study was conducted to determine the effects of various doses and particle sizes (micro or nano) of dietary zinc and zinc oxide on growth performance, serum enzyme activities, carcass characteristics, and zinc requirements in Japanese quails. A total of 576 day-old Japanese quails (both sexes) were housed in 36 deep litter floor pens. Birds received a basal corn–soybean meal diet that was ...

Restriction of behavioral opportunities and uneven use of space are considerable welfare concerns in modern broiler production, particularly when birds are kept at high densities. We hypothesized that increased environmental complexity by provision of barrier perches would help address these issues by encouraging perching and enhancing use of the pen space across a range of stocking densities. ...

The experiment was carried out to investigate the effects of Christmas melon and Neem extract on growth performance, carcass characteristics, organ characteristics cost benefits broiler chickens. employed a completely randomized design. All data generated were subjected analysis variance. A total one hundred day old Abor Acre chickens used in this study, birds weighed arrival brooding pen know ...

the present study was carried out to examine the effect of supplemental dietary valine in the starter diet of broilers (0-15 d of age) on performance, antibodyresponse to newcastle disease virus vaccination and bone mineralization. the experiment was conducted using 300 ross 308 male broilers. one-day-old chicks were randomly allotted to 3 groups; each group consisted of 5 replicate pens with 2...