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J W Kessler

Publications and source records attributed to J W Kessler.

9 recordsLinked to original sources
PubMed1981

The amino acid excretion values in intact and cecectomized negative control roosters used for determining metabolic plus endogenous urinary losses.

Intact and cecectomized adult male, Single Comb White Leghorns were fasted for 24 hr prior to the initiation of the collection period. Excreta were quantitatively collected from each of the unfed control roosters for a 24 to 48 hr fasting period. The amino acids excretion values (mg/bird/24 hr) were not significantly different (P greater than .05) between the intact and cecectomized roosters for histidine or methionine. However, lysine and glutamic acid were significantly different (P less than .05) and all other reported amino acids were significantly different (P less than .01). The results of this preliminary experiment indicate the possible role of the ceca in altering the amino acid excretion values. Additional research is required in the elucidation of cecal involvement, as well as the selection of a proper control for this method of analysis for amino acid availability.

Amino Acids↗
PubMed1976

The arginine requirement of the 4-7 week old broiler.

Two floor pen studies were conducted to determine the minimum arginine level needed to support maximum weight gain and optimum feed conversion during the 4-7 week period of growth for both males and females. Floor feather counts were used as an additional criteria for determining the arginine requirement. The basal diets were calculated to contain 0.74 and 0.80% arginine based on the analyzed values for corn, corn gluten meal, skimmilk and soybean meal. Regression equations were calculated from the data obtained for the males only. Based on the regression equations, the calculated requirement for maximum weight gain, optimum feed conversion, and floor feathers is 1.09, 1.10, and 1.13% arginine, respectively. When expressed as a function of energy, the requirements would be 0.329, 0.332, and 0.341% arginine per megacalorie of metabolizable energy per kg. of diet, respectively. The differences in rate of gain data for the females were non-significant, indicating the requirement of the females to be less than the males. The female requirement, based on floor feathers, would appear to be 0.98% dietary arginine.

Age Factors↗