The relative importance of traits reported in the first three gosford random sample tests     

W. H. Foster 《British poultry science》1967,8(3):201-207

An analysis was performed on the published results of the first, second and third Gosford Random Sample Tests to determine which of the various biological traits reported had the greatest influence upon the overall ranking. Ten traits were considered. It was found that regression on survivors’ average egg production and laying house mortality removed 88.1 per cent of the variation in financial return. The addition of average egg weight and daily food consumption increased this figure to 93.3 per cent. The remaining traits, number of unsaleable birds at 500 days, body weight at 500 days, age at 50 per cent production, blood spots, meat spots and shell thickness, did not produce significant reductions except in so far as they were correlated with those previously mentioned.

The financial returns expected from improvements in the four important traits were:

• Per bird

• + 12 in survivors egg production 2S. 4¼d. ± 1¼d.

• —5 in percentage laying mortality is. 5d.± 1d.

• + 1 g. in average egg weight 10½d. + 1 ½d.

• —5 g. in food consumed per day 43/4d.± 1¼d.

Laying house mortality was found to be positively correlated among the entries with survivors’ average egg production and with average egg weight.  相似文献   

Observations on a foraging association between two freshwater stream fishes     

J. A. Baker  S. A. Foster 《Ecology of Freshwater Fish》1994,3(3):137-139

  相似文献   

Book review     

W. H. Foster 《British poultry science》1980,21(4)

Commercial Chicken Production Manual, 2nd edition, by Mack, O. North. Avi Publishing Co., Inc., Westport, Conn., USA, 1978. 692 pp. Price $42.50.  相似文献   

Direct assay for bluetongue virus by intravascular inoculation of embryonating chicken eggs   总被引：5，自引：0，他引：5  

N M Foster  A J Leudke 《American journal of veterinary research》1968,29(3):749-753

  相似文献   

Feline immunodeficiency virus vaccine issues     

Beatty JA  Barrs VR  O'Brien CR  Foster SF  Foster DJ  Litster AL  Malik R 《Australian veterinary journal》2005,83(1-2):53-53

  相似文献   

Declawing the domestic cat: the technique of onychectomy     

S J Foster  N G Fowler 《The Veterinary record》1971,88(3):68-72

  相似文献   

The effect of light‐dark cycles of abnormal lengths upon egg production     

W. H. Foster 《British poultry science》1968,9(3):273-284

An experiment is described conducted on approximately 1000 pullets from six different strains over a period of almost one year. The three treatments used were cycles of 23, 24 and 25 hr composed of 15 light:8 dark, 15 light:9 dark and 15¼ light:9¾ dark. Egg production increased significantly (P <0.01) with increasing cycle length, the mean rates of lay, expressed as eggs per 100 birds per 24 hr, being 71.6, 72.9 and 73.8 for the 23‐, 24‐ and 25‐hr cycles respectively.

The relative effects of the treatments were found to remain unaltered throughout the experiment.  相似文献   

Evaluation of laparoscopic-assisted placement of jejunostomy feeding tubes in dogs     

Hewitt SA  Brisson BA  Sinclair MD  Foster RA  Swayne SL 《Journal of the American Veterinary Medical Association》2004,225(1):65-71

OBJECTIVE: To evaluate feasibility of performing laparoscopic-assisted placement of a jejunostomy feeding tube (J-tube) and compare complications associated with placement, short-term feedings, and medium-term healing with surgically placed tubes in dogs. DESIGN: Prospective study. ANIMALS: 15 healthy mixed-breed dogs. PROCEDURES: Dogs were randomly allocated to undergo open surgical or laparoscopic-assisted J-tube placement. Required nutrients were administered by a combination of enteric and oral feeding while monitoring for complications. Radiographic contrast studies documented tube direction and location, altered motility, or evidence of stricture. RESULTS: Jejunostomy tubes were successfully placed in the correct location and direction in all dogs. In the laparoscopic group, the ileum was initially selected in 2 dogs, 2 dogs developed moderate hemorrhage at a portal site, and 2 J-tubes kinked during placement but were successfully readjusted postoperatively. All dogs tolerated postoperative feedings. All dogs developed minor ostomy site inflammation, and 1 dog developed bile-induced dermatitis at the ostomy site. Despite mild, transient neutrophilia, no significant difference was noted in WBC counts between groups. No dog had altered gastric motility or evidence of stricture, although the jejunopexy site remained identifiable in several dogs at 30 days. CONCLUSIONS AND CLINICAL RELEVANCE: Requirements for successful J-tube placement were met by use of a laparoscopic-assisted technique, and postoperative complications were mild and comparable to those seen with surgical placement. Laparoscopic-assisted J-tube placement compares favorably to surgical placement in healthy dogs and should be considered as an option for dogs requiring enterostomy feeding but not requiring a celiotomy for other reasons.  相似文献   

Quantification of fatty acids in forages by near-infrared reflectance spectroscopy     

Foster JG  Clapham WM  Fedders JM 《Journal of agricultural and food chemistry》2006,54(9):3186-3192

Near-infrared reflectance spectroscopy (NIRS) was evaluated as a possible alternative to gas chromatography (GC) for the quantitative analysis of fatty acids in forages. Herbage samples from 11 greenhouse-grown forage species (grasses, legumes, and forbs) were collected at three stages of growth. Samples were freeze-dried, ground, and analyzed by GC and NIRS techniques. Half of the 195 samples were used to develop an NIRS calibration file for each of eight fatty acids, with the remaining half used as a validation data set. Spectral data, collected over a wavelength range of 1100-2498 nm, were regressed against GC data to develop calibration equations for lauric (C12:0), myristic (C14:0), palmitic (C16:0), stearic (C18:0), palmitoleic (C16:1), oleic (C18:1), linoleic (C18:2), and alpha-linolenic (C18:3) acids. Calibration equations had high coefficients of determination for calibration (0.93-0.99) and cross-validation (0.89-0.98), and standard errors of calibration and cross-validation were < 20% of the respective means. Simple linear regressions of NIRS results against GC data for the validation data set had r2 values ranging from 0.86 to 0.97. Regression slopes for C12:0, C14:0, C16:0, C18:0, C16:1, C18:2, and C18:3 were not significantly different (P = 0.05) from 1.0. The regression slope for C18:1 was 1.1. The ratio of standard error of prediction to standard deviation was > 3.0 for all fatty acids except C12:0 (2.6) and C14:0 (2.9). Validation statistics indicate that NIRS has high prediction ability for fatty acids in forages. Calibration equations developed using data for all plant materials accurately predicted concentrations of C16:0, C18:2, and C18:3 in individual plant species. Accuracy of prediction was less, but acceptable, for fatty acids (C12:0, C14:0, C18:0, C16:1, and C18:1) that were less prevalent.  相似文献   

Unusual mortality incidents in tit species (family Paridae) associated with the novel bacterium Suttonella ornithocola     

Kirkwood JK  Macgregor SK  Malnick H  Foster G 《The Veterinary record》2006,158(6):203-205

  相似文献