To study surgical reversibility of intraabdominal cryptorchidism, a study in which weanling rats were made artificially cryptorchid was undertaken. At the same time both sperm ducts were anastomosed into the urine bladder (vasocystostomy) to enable sperm output measurements, which were performed by putting the animals in metabolic cages for 24 hr. Group I animals were reoperated on 2 weeks afte...

1. Two experiments with male weanling rats were conducted in which they received individually and restrictedly either a basal semi-purified diet containing starch as the principal carbohydrate or the same diet to which mixed aflatoxins were added in quantities providing from 0.13 to 0.4 mg aflatoxin B1/kg diet. Various natural ingredients, or semi-purified sources of dietary fibre were substitu...

Preference tests and meal pattern analyses were conducted to examine the feed intake response of weanling pigs to spray-dried porcine plasma (SDPP). In Exp. 1, 36 weanling pigs (mean +/- SD; 6.2 +/- .8 kg and 26 d of age) were allowed to choose between a SDPP diet (8.5% SDPP, 20% dried whey, 10% lactose, and .13% DL-methionine) and a dried skim milk (DSM) diet (20% each of DSM and dried whey) t...

The experiment was conducted to evaluate the effect of β-1,3/1,6-glucan on growth performance, immunity and endocrine responses of weanling piglets. One hundred and eighty weanling piglets (Landrace×Large White, 7.20±0.25 kg BW and 28±2 d of age) were randomly fed 1 of 5 treatment diets containing dietary β-1,3/1,6-glucan supplemented at 0, 25, 50, 100 and 200 mg/kg for 4 wks. Each treatment wa...

We examined a variety of strains of Sindbis virus for the genetic changes responsible for differences in neurovirulence in mice. SV1A (a low passage of the AR339 strain of Sindbis virus), a neuroadapted Sindbis virus (NSV), and two laboratory strains of Sindbis virus (HRSP and Toto1101) were examined. NSV causes severe encephalomyelitis with hind-limb paralysis and high mortality after intracer...