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The influence of time off feed on broiler viscera weight, intestinal diameter, and shear was studied by subjecting market-age male broilers (42, 44, or 48 d) to incremental feed withdrawal periods (0, 6, 12, 18, or 24 h). Body weight was determined prior to feed withdrawal and at the time of processing. After slaughter, scalding, and defeathering, the(More)
Pathologic changes and distribution of viral antigen as determined by immunohistochemistry were compared among 4-wk-old specific-pathogen-free chickens inoculated intratracheally with avian influenza virus (AIV) isolates of either low or high pathogenicity. Viruses of low pathogenicity, previously characterized as mildly pathogenic (MP), included(More)
Two types of cartilaginous lesions were observed in a flock of 400 broilers separated into four groups and fed diets containing different energy and NH4Cl contents. The lesions appeared morphologically, histologically, and etiologically different. One lesion found in the vertebrae of 10 birds consisted of focal thickenings and necrosis of growth cartilages.(More)
The first experiment was a central composite rotatable design with calculated calcium levels of 6.2, 7.0, 9.0, 11.0, and 11.8 g/kg diet and total phosphorus levels of 5.2, 6.0, 8.0, 10.0, and 10.8 g/kg diet (2.8 g phytin-P/kg by analysis). This design involved three replicates for each rotatable point and fifteen replicates of the central point. The second(More)
Physical activity and its relationship to animal health is a continuous concern of the food animal industry. This study investigated the relationship between broiler (meat-type chicken) activity to the structural integrity of the gastrocnemius tendon. Birds were exposed to treadmill pacing to determine if increased mobilization would increase tendon(More)
The effect of cyclosporine A on reovirus-infected male broiler chickens was studied. Beginning at 1 or 10 days of age, 3 groups of 15 broilers were injected in the pectoral muscle with 50 mg of cyclosporine A (CSA) in oil per kg body weight every 3 days until 28 days. Controls were injected with olive oil. Two CSA-injected groups and one untreated group(More)
Mycoplasma gallisepticum was isolated from several turkey flocks at different locations in the United States that were clinically affected with respiratory disease. Five of these isolates from four series of outbreaks had patterns similar to the 6/85 vaccine strain of M. gallisepticum by random amplified polymorphic DNA (RAPD) analysis using three different(More)
The subacute toxic effects of cyclopiazonic acid (CPA; given orally) were characterized in the dog (CPA was purified from cultures of Aspergillus flavus). Four groups of dogs were given CPA in gelatin capsules for 90 days at the following dosage levels: 0.05, 0.25, 0.5, and 1.0 mg/kg of body weight; a 5th group was used as controls. All dogs administered(More)
A disease syndrome of broiler chickens is described. Affected birds exhibited poor pigmentation of the shanks, decreased weight gains, elevated feed conversions, poor feathering, enlargement of the proventriculus, and a decrease in the size of the gizzard. Reoviruses were isolated from affected chickens from several farms. Signs and lesions similar to those(More)
Immunoreactive growth factors were identified in chick embryonic cartilage and bone, and in the growth plate of normal tibiotarsi and tibiotarsi affected with tibial dyschondroplasia (TD). A specific pattern of temporal and spatial expression was observed for each growth factor. Transforming growth factor beta and alpha (TGF beta and TGF alpha) and(More)