1. An experiment was conducted to study the effect of naked neck gene (Na) on carcase measurements and some immunological responses of chickens. 2. The presence of naked neck gene in a single or double state increased body weight. 3. The naked neck genotypes (NaNa or Nana) exhibited higher relative weight of dressed carcase, drumstick and breast muscles compared to normally feathered individuals (nana). The proportion of abdominal fat was decreased in both naked neck genotypes compared with normally feathered ones. 4. A higher (non-specific) cell-mediated immune response was evoked in Na gene bearing birds. 5. Higher concentrations of antibodies occurred after injection of sheep red blood cells into naked neck birds, particularly at 14 d post-secondary injection. 6. The NaNa birds had a higher heterophil/lymphocyte ratio than Nana and nana siblings.

No abstract

No abstract

SummaryTwenty-six patients undergoing middle ear surgery were anaesthetised using a completely closed circuit into which liquid isojurane was injected using a syringe pump. The injection rate was guided by a table of calculated rates of isoflurane uptake, utilising the square root of time principle, at succeeding time intervals in direrent weight groups. A constant alveolar concentration of 1.3 M A C was aimed for. The injection rate was changed to that for the higher or lower weight group appropriate to the time interval whenever clinical signs indicated inappropriate depth of anaesthesia. A mean of 10.3 ml liquid isojlurane was used to maintain anaesthesia for a mean of 82.3 minutes. Bloodpressure was maintained at 75% of the pre-operative value. Mean arterial blood gas data and changes in plasma catecholamine levels were within the normal range. The mean recovery time was 10.5 minutes. Syringe pump delivery of liquid isojlurane avoidedjluctuations that result from bolus injections of unit dose. The implemented injection rate table, working as a therapeutic window, guided redosing, reduced calculation time and served as a record. The technique is safe, economic and adaptable to variations in uptake and response to inhalational anaesthetics.