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B C Dilworth

Publications and source records attributed to B C Dilworth.

11 recordsLinked to original sources
PubMed1987

Effect of varying levels of phosphorus and live yeast culture in caged layer diets.

Dietary levels of .31, .36, .41, .46, .51, .56, and .61% total phosphorus (TP) were incorporated into seven corn-soy diets to determine the minimum TP requirement of caged laying hens. Each diet was fed to six lots of 20 hens each for a test period of 308 days. Egg production, feed efficiency, feed consumption, egg weight, and egg breaking strength were the performance criteria. Egg breaking strength was significantly higher while the other performance measures were significantly inferior for hens receiving the .31 TP diet as compared to those hens receiving the other diets. Performance measures of hens receiving diets with TP levels ranging from .41 to .61% were not significantly different. Although hens receiving the .36% TP diet performed significantly better than those receiving diets containing .31% TP, their performance was not satisfactory when compared with performance of hens fed diets containing higher levels of phosphorus. In a second experiment, dietary levels of 0, .25, and .50% live yeast culture (LYC) were fed in combination with TP levels of .40 and .60% to individually caged hens for nine test periods of 28 days each. Each of the test diets was fed to three lots of 12 hens each. Performance criteria in this experiment were the same as those used in the first experiment. Hen responses to the six test diets did not differ significantly for any performance criterion, except for egg breaking strength, which was significantly higher for eggs produced by hens fed diets containing .40% TP level.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1984

Toxicity of jimson weed seed and cocoa shell meal to broilers.

Jimson weed seed meal, which contains alkaloids toxic to animals, and cocoa shell meal, which contains theobromine, also toxic to animals, were used in two experiments with broilers to determine relative toxicity. Pure theobromine was added to diets to furnish the same levels as furnished by 1, 2, 4, and 6% dietary cocoa shell meal, which contained, by analysis, 1.3% theobromine. Approximately 1% jimson meal is the upper dietary limit that can be safely incorporated into the diet of young broilers. Dietary levels of 3 and 6% from 1 to 21 days of age drastically depressed performance. Cocoa shell meal that contained 1.3% theobromine was somewhat less toxic to chicks than jimson meal. However, performance tended to be depressed with dietary levels above 1%. Pure theobromine was a little more toxic than that furnished by cocoa shell meal.

Alkaloids↗
PubMed1976

A comparison of iron bioassay diets.

Two broiler chick experiments wer conducted to evaluate four basal diets for iron bioassay suitability. The test basal diets, identified according to their principal ingredients and iron content, were: (1) starch-skim milk - 15 p.p.m., (2) degerminated corn-skin milk - 18 p.p.m. (3) degermianted corn-fish meal-isolated soy - 45 p.p.m., and (4) degermianted corn-fish meal-dehulled soy - 59p.p.m. Significant differences between an iron source with known low availability (ferric oxide) and a highly available iron source (ferrous sulfate) were not detected with the degerminated corn-fish meal-isolated soy or the degerminated corn-fish meal-dehulled soy diets. Likewise, there were no significant differences found between supplemental iron levels, 10 and 20 p.p.m. The corn-skim milk and starch-skim milk diets were both found to be satisfactory for iron bioassays. However, the sample size needed to estimate the population mean was almost twice as great for the starch-skim milk fed groups, than was needed for the corn-skim milk fed groups which indicates the corn-skim milk diet obtained greater sensitivity in testing iron sources and levels. Mortality was excessively high in the starch-skim milk fed group. Ferrous sulfate was superior to ferric oxide as a source of iron.

Animals↗