Biomedical subjects

J L Wilson

Publications and source records attributed to J L Wilson.

147 records · Page 9Linked to original sources

PubMedDate not supplied

Severe pododermatitis in broiler breeder hens housed on pressure-treated slats.

Severe foot-pad dermatitis was diagnosed in a case of broiler hens housed on slats made of lumber pressure-treated with chromated copper arsenate. Studies were conducted in an attempt to determine whether contact with the lumber caused the lesions. Breeder pullets were housed for 17 weeks on slats made from either untreated oak or pressure-treated lumber. Cresylic acid disinfectant was applied to one set of each slat type. Foot-pad lesions were scored and tissue arsenic levels were measured. Foot pads of the hens on pressure-treated slats were the only tissue with detectable arsenic levels. All groups developed foot-pad lesions, although the lesions appeared to be most severe, and to have developed earlier, in birds on pressure-treated disinfected slats.

Animal Husbandry↗

PubMedDate not supplied

Investigation of bacterial resistance to hatchery disinfectants.

Three commercial chicken hatcheries were sampled for environmental bacteria. Isolated bacteria were tested for resistance to commercial preparations of quaternary ammonia, phenolic, and glutaraldehyde liquid disinfectants. Bacterial isolates were exposed to several disinfectant dilutions bracketing the dilutions recommended by the manufacturer for 5-, 10-, and 15-min exposure periods before subculturing to broth medium. Approximately 8% of the isolates from two of three hatcheries were resistant to disinfectant concentrations at and above the manufacturers recommended dilution and time of exposure. Resistant bacteria included Serratia marcescens, Bacillus cereus, Bacillus thuringiensis, Bacillus badius, Enterococcus faecalis, Enterococcus faecium, Pseudomonas stutzeri, and Enterobacter agglomerans.

Animals↗

PubMedDate not supplied

The effect of inoculating Enterococcus faecalis into the yolk sac on chick quality and maternal antibody absorption.

Four hundred thirty-two 1-day-old specific-pathogen-free chicks were randomly divided into 36 groups of 12. All chicks were given 0.2 ml of Newcastle disease antiserum (hemagglutination-inhibition [HI] titer 1:5120) by injection into the yolk sac at hatch. Half of the groups received 0.2 ml of Enterococcus faecalis (4.0 x 10(8) colony-forming units/ml) by injection into the yolk sac at hatch (treatment). The remaining 18 groups received no bacteria (control). Two treatment groups and two control groups were weighed, bled, killed, and yolk sac weighed daily for the first 9 days of life. Feed was weighed at placement and at the end of the trial. Blood was tested for packed cell volume (PCV), total plasma protein, and Newcastle disease HI titer. No significant difference was observed between treatment and control groups for chick body weight, PCV, and feed consumption. Total plasma protein and retained yolk weight were significantly higher for treatment groups over control (P < 0.01 and P < 0.0001, respectively). Also, the geometric mean serum HI titer (log2) for Newcastle disease antibody was significantly higher in the control chicks vs. the treatment chicks (P < 0.01).

Animals↗