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Articles 1 - 30 of 34
Full-Text Articles in Dairy Science
Alternative Approaches To Improving The Welfare Of Transition Dairy Cows And Their Calves: Use Of Exercise, Randi Alyson Black
Alternative Approaches To Improving The Welfare Of Transition Dairy Cows And Their Calves: Use Of Exercise, Randi Alyson Black
Doctoral Dissertations
Transition cows are the cows most susceptible to disease and prevalence has not changed over the past decade. However, increased physical activity during late gestation may represent a management option to improve transition. Therefore, the objectives of this study were to determine the effect of exercise, pasture turnout, or total confinement on 1.) physical fitness and cortisol concentrations during the dry period, 2.) neutrophil function and behavior during the dry period, 3.) horn growth and wear and sole thickness during the dry period 4.) calving behavior and cortisol concentrations at parturition, and 5.) calf performance, behavior, and cortisol concentrations at …
Effect Of Varying Rumen Degradable And Undegradable Protein On Milk Production And Nitrogen Efficiency In Lactating Dairy Cows Under Summer Conditions, Jeffrey D. Kaufman
Effect Of Varying Rumen Degradable And Undegradable Protein On Milk Production And Nitrogen Efficiency In Lactating Dairy Cows Under Summer Conditions, Jeffrey D. Kaufman
Masters Theses
The objective is to determine the effect of reducing nitrogen input through feeding low rumen degradable protein (RDP) and rumen undegradable protein (RUP) proportions on milk production, nitrogen efficiency and metabolism in heat-stressed cows. Forty-eight mid-lactating, Holstein cows were assigned to treatments using a randomized block design in a 2x2 factorial arrangement of treatments (n = 12/treatment). Treatments included two levels of RDP (10 and 8%) and two levels of RUP (8 and 6%). From d 1 to 21, a common diet (10% RDP-8% RUP) was fed to cows followed with their respective treatment diets fed from d 22 to …
Social Ecological Food Systems: Sustainability Lessons From Maine Dairy Networks, Julia B. Mcguire
Social Ecological Food Systems: Sustainability Lessons From Maine Dairy Networks, Julia B. Mcguire
Electronic Theses and Dissertations
Milk production has played an integral role in the culture, landscape, and economy of Maine’s agriculture. Maine dairy farmers have faced numerous sustainability challenges to economic, environmental, and social aspects of their industry. Like many other complex social ecological systems, the Maine dairy industry faces a gap between scientific knowledge and actionable management or policy. A cultural dichotomy exists between conventional and organic farming. Shifting the focus from this binary, metrics such as social capital may play a key role in solving sustainability issues. Difficulties arise in the governance of complex social ecological systems when the scales of assessment, management, …
The Effect Of Heat Stress And Essential Amino Acids On Production And Metabolism Of Lactating Dairy Cattle, Kimberly Rose Kassube
The Effect Of Heat Stress And Essential Amino Acids On Production And Metabolism Of Lactating Dairy Cattle, Kimberly Rose Kassube
Masters Theses
Heat stress (HS) causes decreases in production of lactating cattle that is only partially explained by decreases in intake. Evidence suggests that changes in energy and protein metabolism occur to cope with the impact of HS. The objective of this thesis was to determine if the effect of jugular infusion of essential amino acids (AA) ameliorated the negative effects of HS in milk production and metabolism. Twelve multiparous lactating Holstein cows were used in a crossover design to evaluate the effect of thermoneutral (THN) and HS environments along with the absence (CTL) …
Study Of Rehydration Properties Of Powder Produced From Chelated Skim Milk, Kristina Ellice Tan
Study Of Rehydration Properties Of Powder Produced From Chelated Skim Milk, Kristina Ellice Tan
Master's Theses
Poor rehydration properties of skim milk powder (SMP) can impact processing efficiency and functionality in finished product applications. Rehydration can be split into four stages: wettability, sinkability, dispersibility, and solubility. Previous work has suggested that chelator addition during SMP manufacture leads to higher solubility compared to SMP without chelators. This study focuses on the addition of ethylene diamine tetraacetic acid (EDTA) or sodium citrate dihydrate (SCD) at concentrations of 5, 10, and 15 mM to skim milk prior to evaporating and spray drying. The objective of this investigation was to determine the effects of the chelator additions on each SMP …
Comparison Of Foaming Properties Between Chelated Reconstituted Smp And Caseinates, Boya Liu
Comparison Of Foaming Properties Between Chelated Reconstituted Smp And Caseinates, Boya Liu
Master's Theses
Caseinate powders have been well accepted because of their foaming properties. In this study, 10% solution of reconstituted skim milk powder (SMP) chelated with sodium hexametaphosphate (SHMP) and trisodium citrate (TSC) at 1 mEq, 50 mEq, and 100 mEq were prepared to conduct a comparison with sodium caseinate, potassium caseinate, and calcium caseinate solutions. Foamability, foam stability as well as the preferential locations of αs-casein, β-casein and !-casein in their foams were analyzed. It was hypothesized that the foamability, foam stability and the preferential locations of these three caseins in the milk foams are different from treatment to treatment. Milk …
Separation And Characterization Of Reconstituted Skim Milk Powder Treated With Mineral Chelators, Amy Kringle
Separation And Characterization Of Reconstituted Skim Milk Powder Treated With Mineral Chelators, Amy Kringle
Master's Theses
The proteins found in milk are largely important in the functionality of many dairy products and dairy processes. The casein micelle system in milk is a complex and highly studied system. The micelle is thought to be a sponge like structure containing four caseins, αs1, αs2, β, and κ casein, and bound together with colloidal calcium phosphate. When a chelating agent such as a citrate, phosphate, or polyphosphate are added to milk systems, the CCP is bound to the chelator and removed from the micelle. It has been shown through past research that the use of …
Identifying Genetic Factors In Streptococcus Uberis That Enable Evasion Of The Host Immune Response, Alexis Christine Burnham
Identifying Genetic Factors In Streptococcus Uberis That Enable Evasion Of The Host Immune Response, Alexis Christine Burnham
Chancellor’s Honors Program Projects
No abstract provided.
Efecto Del Tipo De Ubre, Morfología Del Pezón Y Tipo Racial Sobre La Duración Del Ordeño, En La Lechería Especializada El Guabito (Zarzal), Oscar Hernando Sánchez Rivera
Efecto Del Tipo De Ubre, Morfología Del Pezón Y Tipo Racial Sobre La Duración Del Ordeño, En La Lechería Especializada El Guabito (Zarzal), Oscar Hernando Sánchez Rivera
Zootecnia
No abstract provided.
Efecto De La Alimentación Controlada En Cerdas Lactantes Sobre Los Parámetros Productivos De La Granja, Cindy Lorena Torres Vera
Efecto De La Alimentación Controlada En Cerdas Lactantes Sobre Los Parámetros Productivos De La Granja, Cindy Lorena Torres Vera
Zootecnia
El presente trabajo se desarrolló en la granja porcicola Terranova, ubicada en el municipio de Obando Valle, en el II ciclo de 2014, teniendo como objetivo evaluar el efecto en los parámetro productivos y reproductivos en cerdas lactantes al implementar un nuevo protocolo de alimentación, el cual contó con la participación de 46 cerdas (38 multíparas y 8 primerizas) las cuales fueron divididas aleatoriamente en 2 grupos, uno control y otro experimental; para el grupo control se suministró 2kg de alimento en las horas de la mañana y noche (6:30, 9:00, 11:00 am, 1:30, 3:00, 6:30, 8:30, 9:30 y 10:30 …
Componentes Epidemiológicos Y Económicos Como Base Para La Toma De Decisiones En El Control De Mastitis Bovina En Ganaderías De Zipaquirá (Cundinamarca). Objetivo 2. Determinación De Agentes Bacterianos Causantes De La Mastitis Bovina En Pequeños Y Medianos Productores, Nayiby Viviana Romero Castillo
Componentes Epidemiológicos Y Económicos Como Base Para La Toma De Decisiones En El Control De Mastitis Bovina En Ganaderías De Zipaquirá (Cundinamarca). Objetivo 2. Determinación De Agentes Bacterianos Causantes De La Mastitis Bovina En Pequeños Y Medianos Productores, Nayiby Viviana Romero Castillo
Zootecnia
No abstract provided.
Growth Performance, Nutrient Utilization, And Metabolic Profile Of Dairy Heifers Fed Diets High In Distillers Grains With Different Forage To Concentrate Ratios, Angela Kristia Manthey
Growth Performance, Nutrient Utilization, And Metabolic Profile Of Dairy Heifers Fed Diets High In Distillers Grains With Different Forage To Concentrate Ratios, Angela Kristia Manthey
Electronic Theses and Dissertations
Two studies were conducted to evaluate the effect of limit-feeding heifers distillers grains with solubles (DDGS) with varying forage to concentrate ratios. The effects on growth, feed efficiency, rumen fermentation, nutrient digestibility, metabolic profile and onset of puberty, as well as post trial performance were investigated. First, a 16-wk feeding trial was conducted using 48 Holstein heifers to evaluate effects of dietary treatment on dry matter intake (DMI), average daily gain (ADG), growth performance, rumen fermentation, and nutrient digestibility. Treatments were 1) 30% DDGS, with the diet fed at 2.65% of body weight (BW) (30DG), 2) 40% DDGS, with the …
An Evaluation Of Rumen Modifiers For Lactational Performance And Nutrient Digestibility By Cows, Prakash Poudel
An Evaluation Of Rumen Modifiers For Lactational Performance And Nutrient Digestibility By Cows, Prakash Poudel
Electronic Theses and Dissertations
Three studies were conducted to evaluate a commercial blend of essential oils, active dried yeast product and cobalt lactate on production performance, rumen fermentation and nutrient digestibility by cows by using in vivo and in vitro methods. The first study evaluated the lactational performance and nutrient digestibility of lactating Holstein dairy cows fed two commercial supplements: 1) a propriety blend of essential oils and Cobalt lactate (EOC) (Stay Strong, Ralco, Inc., Marshall, MN) and 2) active dried yeast (ADY) (Omnigen AF, Prince Agri Products, Inc., Quincy, IL). The 12-week experiment demonstrated no differences in milk production, milk composition, and feed …
Efecto De La Suplementación Con Silo De Rye Grass Lolium Perenne En Vacas De Trópico Alto Zipaquirá, Cundinamarca, Carlos Gómez, Daniel López
Efecto De La Suplementación Con Silo De Rye Grass Lolium Perenne En Vacas De Trópico Alto Zipaquirá, Cundinamarca, Carlos Gómez, Daniel López
Zootecnia
Con el fin de evaluar el efecto de la suplementación con silo de Rye Grass sobre la producción y composición de la leche en vacas de trópico alto, se planteó un estudio con 15 vacas Holstein, en segundo tercio de lactancia, divididas en 2 grupos experimentales, 1 se denomina T-ABC con 7 vacas y 2 T-SRG con 8 vacas. El suplemento se le ofreció en una razón de 4: 1 (4L / 1S) en el momento del ordeño, la cual se realizó en horas de la mañana y la tarde. Se tomaron muestras de leche de los dos ordeños se …
Relación Entre Clasificación Lineal Y Características Productivas En Vacas Holstein De Cundinamarca, Felipe Lanziano Vargas
Relación Entre Clasificación Lineal Y Características Productivas En Vacas Holstein De Cundinamarca, Felipe Lanziano Vargas
Zootecnia
El objetivo de esta investigación fue evaluar las características de tipo agrupadas con la producción de leche y el intervalo entre partos en ganado Holstein en Cundinamarca, Se utilizaron registros de producción, reproducción y conformación de 430 vacas Holstein ubicadas en 35 hatos lecheros de Cundinamarca. Se evaluaron 24 características de conformación (tipo) con una puntuación de 1 a 9 por una persona experta en evaluación lineal. Se realizó un análisis de correlación entre las características de tipo con producción de leche y el intervalo entre partos, adicionalmente, se realizó un análisis descriptivo de las características en vacas con más …
Calidad Higiénica De La Leche De 21 Ganaderías Medianas Pertenecientes Al Área 5 De Zipaquirá, Cundinamarca, Jorge Armando Suarez Suarez
Calidad Higiénica De La Leche De 21 Ganaderías Medianas Pertenecientes Al Área 5 De Zipaquirá, Cundinamarca, Jorge Armando Suarez Suarez
Zootecnia
No abstract provided.
Efecto De Una Sal Nitrogenada En Novillos En Fase De Ceba En Yopal Casanare, Angélica Yorleth Amézquita Guzmán
Efecto De Una Sal Nitrogenada En Novillos En Fase De Ceba En Yopal Casanare, Angélica Yorleth Amézquita Guzmán
Zootecnia
Este estudio se realizó para determinar el efecto de la sal nitrogenada en novillos en fase de ceba en Yopal, Casanare. Se plantearon dos tratamientos, T1: Sal nitrogenada y T2: Sal mineralizada, cada uno contó con 10 machos cebú comercial con peso promedio de 400 kg y edad promedio de 36 meses. El experimento se realizó en época seca, durante un tiempo de tres meses. Se evaluó el peso corporal y la ganancia de peso. Aunque no se encontraron diferencias significativas de ganancia de peso entre los promedios de los tratamientos, la sal nitrogenada incrementó en promedio 6 kg por …
Evaluación Y Comparación De Dos Sistemas De Producción Lechera Bovino Y Bufalino En Un Hato Del Magdalena Medio, Juan Sebastian Villamizar Quiroz
Evaluación Y Comparación De Dos Sistemas De Producción Lechera Bovino Y Bufalino En Un Hato Del Magdalena Medio, Juan Sebastian Villamizar Quiroz
Zootecnia
Uno de los factores que tiene mayor afectación en los sistemas de producción hoy en día son los aspectos climáticos, debido a sus fluctuaciones encontramos inestabilidad en la producción de forraje de calidad para una buena alimentación de nuestros animales. La problemática que se tiene es el inadecuado manejo de rotación de los potreros en los cuales pastorean las vacas y búfalas que se encuentras en producción, igualmente la calidad del forraje que están consumiendo se ve afectada por estas razones. Por eso se propuso el objetivo de determinación de la calidad, producción y composición botánica de las praderas suministrados …
Costos De Implementación De Las Buenas Prácticas De Ordeño En Cuatro Escenarios De Hatos Lecheros En Cundinamarca, Mariano Del Campo Parra Muñoz
Costos De Implementación De Las Buenas Prácticas De Ordeño En Cuatro Escenarios De Hatos Lecheros En Cundinamarca, Mariano Del Campo Parra Muñoz
Zootecnia
No abstract provided.
Implementación De Un Modelo De Partos Estacionales En Un Sistema De Cría Doble Propósito Bovino En El Piedemonte Llanero, Juan Harvey Castro Murillo
Implementación De Un Modelo De Partos Estacionales En Un Sistema De Cría Doble Propósito Bovino En El Piedemonte Llanero, Juan Harvey Castro Murillo
Zootecnia
No abstract provided.
Effect Of Direct-Fed Microbials And Enzyme Supplementation In Prepartum Holstein Cows On Colostrum And Calf Immunity, Erin M. Shangraw
Effect Of Direct-Fed Microbials And Enzyme Supplementation In Prepartum Holstein Cows On Colostrum And Calf Immunity, Erin M. Shangraw
Honors Theses and Capstones
In cows, colostrum is composed of several antibodies and nutrients to provide immunity and energy to the calf. Feeding calves high quality colostrum has been shown to improve calf health, leading to reduced mortality in calves and greater milk production in cows. The addition of direct-fed microbials (DFM) to cow diets has been theorized to improve feed efficiency and milk production, with studies showing mixed results. However, few experiments have studied the effect of feeding DFM on colostrum quality. In this experiment two treatments were given, 1) DFM and 2) DFM and enzymes (DFME). Colostrum was …
An Investigation Of The Use Of Natural Agents To Control Mycobacteria, Olga Lesniak
An Investigation Of The Use Of Natural Agents To Control Mycobacteria, Olga Lesniak
Theses
Economic losses that are caused by Mycobacterium avium paratuberculosis (MAP) infections represent a major obstacle for farmers and also for the dairy industry. In order to control the population of MAP, alternative control agents must be investigated. One of the studies described in this thesis focused on using a bacteriophage therapy based approach to assess its efficacy on simulated industrial environments and food models. Another study described in this thesis investigated the antimicrobial effects of parsley and garlic on a range of mycobacteria species. Both studies used conventional microbiological methods such as plaque assays, AlamarBlue assay (MABA) and growth curves, …
Development And Validation Of Gas Chromatographic Methods For Free Fatty Acid Determination In Dairy Products, David Mannion
Development And Validation Of Gas Chromatographic Methods For Free Fatty Acid Determination In Dairy Products, David Mannion
Theses
Quantification of free fatty acids (FFA) in dairy products by gas chromatography flame ion'^ation detection is an important requirement for qua'ity, research, nutritional, authenticity and legislative purposes. Common procedures are typically variants of either the fatty acid methyl esterification (FAME) or direct on-column injection methods developed more than two decades ago. This study involved the development of an alternative novel derivatization method using butylation, incorporating automation, reducing solvent usage that is applicable for a wide range of dairy products. The accuracy, precision, linearity, limits of detection and limits of quantification of all three methods were assessed for the quantification of …
Improving Feed Efficiency Through Forage Strategies For Increasing Dairy Profitability And Sustainability, Jon Patrick Pretz
Improving Feed Efficiency Through Forage Strategies For Increasing Dairy Profitability And Sustainability, Jon Patrick Pretz
Electronic Theses and Dissertations
Three studies were conducted to determine production parameters and study specific hypothesis in regard to improving feed efficiency through various forage utilization strategies with or without the inclusion of various supplemented products. The first study evaluated the supplementation of a cobalt-lactate product and its effects on fiber digestibility and milk production parameters when fed to cows consuming a 70% forage diet. Treatments included: 1) CONTROL diet containing 12.5 mg/cow/d of cobalt (carbonate carbonate) and 2) TEST diet being the same basal diet but including an additional 50 mg/cow/d of cobalt via a 1% Co-lactate product (Co-Max®). In a feeding trial …
Role Of Exopolymeric Substances In Biofilm Formation On Dairy Separation Membranes, Nuria Garcia-Fernandez
Role Of Exopolymeric Substances In Biofilm Formation On Dairy Separation Membranes, Nuria Garcia-Fernandez
Electronic Theses and Dissertations
In the concentration of cheese whey by membrane filtration processes, fouling is a major limiting factor that leads to flux decline and affects product quality. The growth of biofilms on membranes contributes to biofouling. Biofilms are very difficult to eliminate, and will serve as the seed for additional biofilm development and product contamination. The biofilm matrix is composed mainly of microbial exopolymeric substances (EPS), and therefore EPS is thought to help bacteria to adhere and form biofilms by acting as a cementing agent. The first research project under this study was conducted with the aim of elucidating the role of …
Effects Of Bran Treatment On Rheology And Sensory Quality Of Whole Wheat Flat Bread, Jigyasha Mishra
Effects Of Bran Treatment On Rheology And Sensory Quality Of Whole Wheat Flat Bread, Jigyasha Mishra
Electronic Theses and Dissertations
The purpose of this research was to study the differences in the quality of 100% whole wheat flour (WWF) when the bran fraction was subjected to mild solvent treatment before reconstitution with the endosperm. The bran treatments included water washing and washing with ethanol solutions (50% and 100%). WWF prepared with untreated bran served as the control. Effects of these treatments on particle size, chemical composition, color, dough rheology, product formulation, and sensory characteristics of 100% whole wheat flour were studied. Grains of five HRSW cultivars (Advance, Prevail, Select, Brick and Forefront) were milled using a Quadrumat Senior mill. Gluten …
Three Overlooked Issues: Water Quality, Forage Quality, And Forage Blends Impacting The Feed Efficiency Of Dairy Cows, Ishwary Prasad Acharya
Three Overlooked Issues: Water Quality, Forage Quality, And Forage Blends Impacting The Feed Efficiency Of Dairy Cows, Ishwary Prasad Acharya
Electronic Theses and Dissertations
The overall objectives of the six studies were to increase the feed efficiency in lactating dairy cows. The first study evaluated the efficacy of different water sources and treatment systems on ruminal parameters using an in vitro gas production system. Outcomes of the study suggested that the source and nutrient quality of water can affect rate of ruminal fermentation. Thus, use of real farm water being offered to the cow to conduct in vitro gas production measurements may accurately predict the ruminal fermentation, digestibility and total gas production. The second study evaluated two recently developed leafy-floury corn silage hybrids against …
Manufacture, Concentration, And Functionality Of Micellar Casein Concentrate, Dustin Grossbier
Manufacture, Concentration, And Functionality Of Micellar Casein Concentrate, Dustin Grossbier
Electronic Theses and Dissertations
This research has been structured into 3 major parts. The first part evaluates a centrifugal evaporator to concentrate micellar casein concentrate (MCC). The second part evaluates a wiped film evaporator (WFE) to concentrate MCC. The third part evaluates heat stability of the high concentration MCC produced by WFE. In part 1, the primary objective was to achieve >25% total solids (TS) without a loss of water removal rate associated with high solids materials. This is of importance, industrially, as this could reduce processing costs or eliminate drying all together. The major finding was that it did not offer any benefits …
Study Of The Effect Of Feeding Highly Digestible Corn Based Calf Starter On The Growth Performance Of Calves, Shruti Srivastava
Study Of The Effect Of Feeding Highly Digestible Corn Based Calf Starter On The Growth Performance Of Calves, Shruti Srivastava
Electronic Theses and Dissertations
New corn hybrids have been developed by Masters Choice (MC) that vary in energy density and starch digestibility. These MC hybrids have lower starch densities due to an altered starch structure, which allows for greater ruminal and intestinal starch digestion. The altered starch structure of these new hybrids results in reduced feed manufacturing costs (i.e., grinding). Thirty (30) 1 to 3 d old (40.6 ± 1.72 kg) Holstein heifer calves were randomly assigned to 1 of 2 calf starters to measure growth performance of Holstein heifer calves through 8 weeks of age. Treatments were: 1) Hard starch (HS) corn calf …
Evaluation Of Essential Oils (Stay Strong) For Dairy Calves, Kelly Ann Froehlich
Evaluation Of Essential Oils (Stay Strong) For Dairy Calves, Kelly Ann Froehlich
Electronic Theses and Dissertations
Stay Strong (SS, Ralco Inc., Marshall, MN) is a blend of essential oils (EO) and prebiotic fiber technologies designed to promote immunity and stimulate appetite, helping to diminish health challenges and stresses experienced by newborn calves. Current feeding inclusion rates are unknown to achieve optimal performance in the first 8 weeks of life. The study objectives were to determine the optimal feeding inclusion rate of SS when added to milk replacer (MR) to achieve optimal performance when compared to a yeast cell wall (YCW). One hundred Holstein calves were blocked by birth date and randomly assigned to 1 of 5 …