the present study performed to examine canola meal on morphology of thyroid gland in broiler chicks. in this experiment 300 l-day-old unsexed ross broiler chicks assigned into 5 groups. the chicks were fed by five level of canola meal (0, 5, 10, 15 and 20%). after 42 days feeding four chicks from each pen killed and their thyroid glands removed and immediately were immersed in formaldehyde, bef...

Electron Microscopy: Daniel C. Pease .............. 543 Incorporation of C14 From Carboxyl-labeled dl-Alanine Into the Proteins of Liver Slices: Ivan D. Frantz, Jr., Robert B. Loftfield, and Warren W. Miller ........ ...................... 544 Isolation of Avian Pneumoencephalitis (Newcastle Disease) Virus From the Yolk Sac of Four-Day-Old Chicks, Embryos, and Infertile Eggs: P. D. DeLay 545 An...

Feather pecking in domestic fowl is a behavioral abnormality that consists of mild or injurious pecking at feathers of conspecifics. Previously, it was shown that chicks from a high feather-pecking (HFP) and low feather-pecking (LFP) line of laying hens already differ in their propensity to feather peck at 14 and 28 days of age. As a first step in investigating a possible relationship between t...

Chicks infected as 12-day-old embryos with an end-point purified derivative of avian myeloblastosis virus developed a rapidly progressive osteopetrosis that manifested within 1 week of hatching. A detailed comparison of osteopetrotic chicks and normal hatchmates revealed the following. (i) Osteopetrotic chicks exhibited a stunting syndrome, growing at a mean rate that was 26% of the control rat...

Propofol is an ultra-short acting anesthetic agent. The information on the pharmacological and toxicological effects of propofol in the chicken is rather limited. This study examines the toxicity and pharmaco-behavioral effects of propofol given intraperitoneally in 7-10 day-old chicks. The median effective doses of propofol for the induction of sedation, analgesia to electric stimulation and s...

It may be possible to exploit olfactory attachments shown by chickens, Gallus gallus domesticus, to improve their welfare. In the present study, chicks were housed in groups of 15 in wooden boxes from 1 day of age. Experiment 1 compared fear responses in pairs of 8–10-day-old chicks with no previous experience of vanillin when they were exposed to an unfamiliar open field containing a dish of f...

Received: Revised: Accepted: Published online: March 26, 2015 July 23, 2015 August 25, 2015 December 31, 2015 Tibial Dyschondroplasia (TD) is an important leg problem in fast growing birds that disturbs the proximal tibial growth plate. A study was conducted to evaluate the effects of gambogic acid (GA) on hsp-90 expressions and antioxidant capability in thiram-induced TD chicken. One hundred a...

two experiments were conducted to evaluate the effects of thyroxin in ovo injection and post hatch arginine feed supplementation on performance and cold tolerance acquisition in broilers. in experiment 1, a total of 2400 hatchings eggs were randomly assigned to four treatments: positive controls (intact or pricked with a needle), negative control (intact egg), injected with distilled water and ...

While anti-human blood group B agglutinins are present in the majority of ordinary White Leghorn chicks by the age of 30 days, none could be demonstrated in germfree chicks up to the age of 60 days. Anti-B agglutinins in trace amounts were first found in germfree chicks 66 days old and increased to an average titer of about 1:2 by 91 days of age. This titer amounts to about 10 per cent of that ...

Campylobacter enteritis is an emerging food borne zoonotic disease. Improperly cooked chicken serve as a potential source for this infection. Diarrheogenic potential of Campylobacter jejuni is tested either by in-vivo rat ileal loop (RIL) test or by molecular methods. This study reveals that 3-day-old chicks can serve as an animal model for toxigenic C. jejuni.