Leo S. Jensen
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Threonine Supplementation of Practical Diets for 3- to 60 Wk-Old Broilers Open
Threonine is generally considered the third limiting amino acid after methionine and lysine in broiler production. Less information is available on the quantitative requirement of threonine for older broilers than for birds during the star…
Tissue and Egg Cholesterol Concentrations of Laying Hens Fed High-Protein Barley Flour, α-Tocotrienol, and Cholesterol Open
The effect of high-protein barley flour (HPBF), cholesterol, and α-tocotrienol on tissue and egg cholesterol homeostasis of laying hens was investigated. Laying hens (eight per treatment) were fed a basal diet with 0, 5, or 10% HPBF in the…
The Hypocholesterolemic Agent Dichloroacetate Increases Egg Cholesterol Content of Laying Hens Open
Experiments were conducted to determine whether a diet with added dichloroacetate (DCA), an inhibitor of cholesterol biosynthesis, would influence plasma and egg cholesterol concentrations when fed to laying hens. In the first experiment, …
Reduced Plasma Cholesterol and Lipoprotein in Laying Hens Without Concomitant Reduction of Egg Cholesterol in Response to Dietary Sorbose , Open
Experiments were conducted to determine the effect of sorbose on feed consumption, egg production and size, and cholesterol metabolism of laying hens. In Experiment 1, 87-wk-old laying hens (10 per treatment) were fed diets containing 0, 1…
Growth and Tissue Lipid Deposition of Broilers Fed α-Ketoisocaproic Acid Open
Dietary alpha-ketoisocaproic acid (KIC) was studied for effects on growth, feed efficiency, tissue cholesterol (TC) content, and immune response to a Newcastle disease virus (NDV) vaccination in broilers. In two experiments, broiler chicks…
Influence of Dietary Taurine on Performance and Fat Retention in Broilers and Turkey Poults Fed Varying Levels of Fat Open
Taurine, an amino acid synthesized from Met, primarily functions in bile acid conjugation. Four experiments were conducted to determine whether Tau supplementation of broiler cockerels and female turkey poults to 3 wk of age would influenc…
Cholesterol Concentration of Egg Yolk and Blood Plasma and Performance of Laying Hens as Influenced by Dietary α-Ketoisocaproic Acid Open
Experiments were conducted to determine the effect of supplemental alpha-ketoisocaproic acid (KIC) or Leu on layer performance and plasma and egg cholesterol levels. In the first experiment, 0, .09, or .27% KIC and .09 or .27% Leu were fed…
Research Note: Putrescine Effects on Performance of Male Broiler Chicks Fed Low-Protein Diets Supplemented with Essential Amino Acids Open
The purpose of the present study was to determine whether a polyamine deficiency could account for the reduced performance of broiler chicks fed a low-protein diet supplemented with several synthetic amino acids in comparison with those fe…
Influence of Protein Concentration, Amino Acid Supplementation, and Daily Time of Access to High- or Low-Protein Diets on Egg Weight and Components in Laying Hens Open
Feeding a 13% CP diet based on corn and soybean meal and supplemented with methionine to laying hens results in reduced egg weight in comparison with hens fed a corn and soybean meal methionine-supplemented diet containing 16% CP. An exper…
Effect of Age of Hen, Egg Weight, and Sex on Chick Performance and Lipid Retention Open
Experiments were conducted to determine whether age of hen, weight of the egg, and sex of the chick affected fat retention and growth of the broiler chick. Chicks were fed a corn and soybean meal diet containing 5% supplemental poultry fat…
Influence of Orotic Acid on Performance, Liver Lipid Content, and Egg Cholesterol Level of Laying Hens Open
Three experiments were conducted to determine the effects of dietary orotic acid (OA) on laying hen performance, liver lipid content, and plasma and egg cholesterol levels. Laying hens were fed a basal diet supplemented with 0, .5, 1.0, an…
Response to Tryptophan of Laying Hens Fed Practical Diets Varying in Protein Concentration Open
Four experiments were conducted with White Leghorn laying hens to estimate their requirement for tryptophan for optimal egg production and other parameters. In the first two experiments, the hens were fed a 14.5% protein diet supplemented …
The Requirement for Sulfur Amino Acid by Laying Hens as Influenced by the Protein Concentration Open
Two experiments were conducted with White Leghorn laying hens to determine the influence of the dietary CP concentration on the requirement for TSAA. Supplements of 0, .05, .1, or .15% of DL-methionine (Experiment 1) and 0, .025, .05, .075…
Research Note: Cholesterol Content of Commercially Produced Eggs in Georgia Open
A survey of the cholesterol content of eggs obtained from commercial sources in Georgia was conducted. Data on flock age, egg-production rate, strain, molting status, as well as dietary protein, fat, ME, and the content of animal by-produc…
Male Broiler Performance During the Starting and Growing Periods as Affected by Dietary Protein, Essential Amino Acids, and Potassium Levels Open
Three experiments were conducted to determine the effects of dietary CP, essential amino acid (EAA), and K content upon male broiler performance during starting and growing periods (7 to 21 and 21 to 42 days, respectively). In Experiment 1…
Dietary Protein Level and Essential Amino Acid Content: Influence upon Female Broiler Performance During the Grower Period Open
Three experiments were conducted to determine effects of dietary CP level and essential amino acid (EAA) content upon female broiler performance during the grower period (21 to 42 days). In each experiment, the design included a diet conta…
Influence on Performance of Three to Six-Week-Old Broilers of Varying Dietary Protein Contents with Supplementation of Essential Amino Acid Requirements Open
Effects were evaluated of feeding diets differing in CP content but formulated to be adequate in essential amino acids (EAA) on performance and certain plasma metabolites of female broilers from 21 to 42 days of age. In Experiment 1, isoca…
Sulfur Amino Acid Requirement of Broiler Chickens from 3 to 6 Weeks of Age Open
Two experiments were conducted to determine if the TSAA level suggested by the National Research Council (NRC) in 1984 was adequate for optimum performance of 3 to 6-wk-old broilers, and to assess the effect of added copper on the TSAA req…
Induction of Voluntary Feed Intake Restriction in Broiler Chicks by Dietary Glycolic Acid Supplementation Open
Experiments were conducted to evaluate the effects of feeding various dietary levels of glycolic acid (GA) on feed intake (FI) and growth in young broiler chickens. When fed at a supplementation level equimolar to glycine (GLY, 2.64% of th…
Time Course Study of Liver Lipid, Mixed-Function Oxidase, and Estradiol Metabolism in Laying Hens Fed Different Diets Open
The purpose of this investigation was to determine if hepatic mixed-function oxidase (MFO) activity, plasma estradiol, and estradiol metabolism changed in concert with liver lipid content when laying hens were fed two diets of different co…
Effect of Dietary Calcium Level and Ingredient Composition on Plasma Calcium and Shell Quality in Laying Hens Open
Three experiments were conducted with White Leghorn laying hens to study the effect of changes in ingredient composition of diets varying in calcium level on various parameters. Calcium at 2.75 and 3.5% were compared in a corn-soy diet (CS…
Effect of Dietary Composition and Estradiol Implants on Hepatic Microsomal Mixed Function Oxidase and Lipid Deposition in Growing Chicks Open
Three experiments were conducted to investigate the effect of diet and estradiol (E2) administration on hepatic microsomal mixed function oxidase (MFO) activity, E2 metabolism, and liver lipid content in male broiler chicks. Broiler chicks…
Diet Composition, Environmental Temperature, and Exogenous Estradiol Effects on Hepatic Lipid Deposition in Growing Chicks Open
The interrelationships among dietary composition, environmental temperature, and level of estradiol (E2) administration on hepatic lipid deposition in chicks were studied. Two levels of E2 were injected at three intervals over a 4-day peri…
Methionine Requirement of Developing Turkeys From 8–12 Weeks of Age Open
Two experiments were conducted with Large White male turkeys from 8-12 weeks of age to estimate the methionine requirement for optimum growth rate and feed efficiency. The first experiment was conducted with five pens of 22 turkeys per tre…
Sulfur Amino Acid Requirement and Foot Pad Dermatitis in Turkey Poults Open
Five experiments were conducted with Large White poults to determine the effect of methionine and other sulfur-containing compounds on the incidence and severity of dermatitis and on growth and feed efficiency to three or four weeks of age…
Effect of High Dietary Copper on Fatty Acid Composition of the Chick Open
Three experiments were conducted to study the effect of varying levels of dietary copper on fatty acid composition of adipose and liver tissue of male broiler chicks. Chicks were fed the experimental diets to 4 weeks at which time leg adip…
Effect of High Dietary Copper on Gizzard Integrity of the Chick Open
Six experiments were conducted with male broiler chicks kept in battery brooders to investigate the effects of feeding diets high in copper on the integrity of the gizzard lining. Conventional and corn starch-soy basal diets were used. Sli…
A Foot Pad Dermatitis in Turkey Poults Associated with Soybean Meal Open
DERMATITIS in turkey poults is produced by feeding rations deficient in certain vitamins. A dermatitis characterized by lesions on the corners of the mouth and on the eyelids was observed in poults fed a diet deficient in pantothenic acid …
Requirement of Turkey Poults for Biotin and Effect of Deficiency of Incidence of Leg Weakness in Developing Turkeys Open
SOON after the discovery of biotin its nutritional significance in chick and poult nutrition was investigated by Patrick et al. (1942) who observed that a deficiency resulted in perosis and a dermatitis that appeared first on the foot pads…