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Full-Text Articles in Life Sciences

The Effect Of Calcium And Nonphytate Phosphorus On Chicken Genetic Line, Egg Production, Shell Quality, Bone Homeostasis, And Progeny Bone Quality, Phiphob Sodsee Dec 2013

The Effect Of Calcium And Nonphytate Phosphorus On Chicken Genetic Line, Egg Production, Shell Quality, Bone Homeostasis, And Progeny Bone Quality, Phiphob Sodsee

Theses and Dissertations

The study consisted of two parts to determine effects of dietary calcium (Ca) and nonphytate phosphorus (NPP) level on four pure genetic lines of broiler breeders. The first part was concentrated on body composition, egg production and shell quality changes according to diet and genetic line. The second part was the study of bone homeostasis variables combining hematology, bone histology and body composition changes according to diet and genetic line. In the study, pullets (246 from each of pure genetic line A, B, C and D) were individually caged and light stimulated at 21 weeks of age. The study duration ...


Evaluating Economic And Environmental Impacts Of Changing Herd Sire Genetics On Arkansas Cow-Calf Operations, Daniel Keeton Aug 2013

Evaluating Economic And Environmental Impacts Of Changing Herd Sire Genetics On Arkansas Cow-Calf Operations, Daniel Keeton

Theses and Dissertations

This research looks at impacts of changing sires, and thus bull genetics, on cow-calf operations of varying land and herd sizes in the state of Arkansas. A 2012 Across-Breed EPD table, adjusted to the Angus breed, was used to estimate breed sire effects on birth weight and weaning weight of the herd's offspring (Kuehn and Thallman 2012a). Together with modified animal performance, the use of 2012 and most recent five- and ten- year Arkansas state average prices, allowed the evaluation of changing herd sires by accounting for breed type and hide color differences in prices. Using a spreadsheet tool ...


Hair Shedding Scores Relating To Maternal Traits And Productivity In Beef Cattle, Ashton Williams May 2013

Hair Shedding Scores Relating To Maternal Traits And Productivity In Beef Cattle, Ashton Williams

Animal Science Undergraduate Honors Theses

The objectives of this study were to measure how quickly cattle shed their winter coat in the sub-tropical climate of Arkansas. As well as, to understand the role age may play on cattle shedding efficiency in spring and summer months, in conjunction with the relationship between mother hair coat and calf sex. Angus based commercial beef cattle (n = 224) were observed over a five-month period in 2012. Once monthly, at approximately 28-day intervals, cattle were evaluated for shedding on a scale from 1 to 5. A score of 5 indicated the cow/heifer had a full winter coat and a ...


Effects Of Ergot Alkaloids And Bovine Bodily Fluids On Cytochrome P450 Activity, Nicholas Scott Ezell May 2013

Effects Of Ergot Alkaloids And Bovine Bodily Fluids On Cytochrome P450 Activity, Nicholas Scott Ezell

Theses and Dissertations

This thesis evaluates the PromegaTM P450-Glo assay (PromegaTM V9800) as a tool for quantifying ergot alkaloid concentration. Current techniques used for detection of ergot alkaloids are slow and expensive, do not detect all ergot alkaloids, or are not effective on bovine bodily fluids. The first study was conducted to determine effects of commercial ergot alkaloids (n = 6; 0 - 400 μM) on the PromegaTM P450-Glo assay. Cytochrome P450 (CYP450) activity in assay had a differential response to each ergot alkaloid and concentration. As concentrations of ergotamine, dihydroergotamine, ergocornine, and ergocryptine increased CYP450 activity was inhibited (P < 0.05). Increases in ergonovine and pergolide concentration did not affect (P > 0.1 ...


Relationship Of Lactate Dehydrogenase & Prolactin Genotypes To Immune Function, Growth, And Composition Of Replacement Heifers Grazing Tall Fescue, Christina Marie Turner May 2013

Relationship Of Lactate Dehydrogenase & Prolactin Genotypes To Immune Function, Growth, And Composition Of Replacement Heifers Grazing Tall Fescue, Christina Marie Turner

Theses and Dissertations

Objectives of this research were to determine effects of LDH enzymatic activity and circulating PRL on immune response, growth, composition, and reproduction, and to determine the effects of single nucleotide polymorphisms of LDH and PRL on immune function, growth and carcass traits, cyclicty, and fecundity of replacement heifers grazing endophyte infected tall fescue. Eighty-nine Angus based heifers had physical and ultrasound measurements along with blood samples collected at weaning, yearling, and prebreeding. Estrus detection was conducted for 10 d post each collection period, except prebreeding. Pregnancy status was verified after AI and again after bull removal. Heifers were maintained on ...


Efficacies Of Fenbendazole And Albendazole In The Treatment Of Commercial Turkeys Artificially Infected With Ascaridiadissimilis, Jessica Perkins May 2013

Efficacies Of Fenbendazole And Albendazole In The Treatment Of Commercial Turkeys Artificially Infected With Ascaridiadissimilis, Jessica Perkins

Animal Science Undergraduate Honors Theses

The goal of this research was to determine the extent of anthelmintic resistance that turkey roundworms, Ascaridiadissimilis, have developed to anti-parasitic chemicals used in commercial turkey operations. Roundworm infections in turkeys have resulted in monetary losses for the poultry industry for years, generally due to poor feed conversion. The infection itself is generally subclinical and many turkeys have a light to moderate worm burden. Since parasitisms are light, this leads to the infections being noticed only during processing.A. dissimilis infections consist of adult worms and developing larvae with the latter comprising most of the worm burden and causing the ...