Open Access. Powered by Scholars. Published by Universities.®

Life Sciences Commons

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 30 of 85

Full-Text Articles in Life Sciences

Creating Online Training Modules For Student Employees At The California Polytechnic State University Dairy Using Train Trac, Olivia K. Taylor Jun 2019

Creating Online Training Modules For Student Employees At The California Polytechnic State University Dairy Using Train Trac, Olivia K. Taylor

Agricultural Education and Communication

The purpose of this project was to create training modules for the Cal Poly Dairy. The author’s goal was to incorporate the safety aspect of dairy work into the modules as well. To properly obtain all the necessary information for the modules, the author first had to compile lists from the Cal Poly Dairy’s written standard operating procedures. From here, the majority of time was used to gather video and picture content using a surface tablet that would later be used in the online modules. Once the content was gathered, it had to be organized into files for ...


Agricultural Sciences Outreach Program, Maghan Lea England, Sophie Lorraine Johnston Dec 2018

Agricultural Sciences Outreach Program, Maghan Lea England, Sophie Lorraine Johnston

Agricultural Education and Communication

The College of Agriculture, Food, and Environmental Sciences (CAFES) mission statement and vision of the Agricultural Education and Communication Department is to develop future leaders, educators, and communicators to advance and advocate for the agricultural industry in a global economy (AGED, 2018). Student organizations, such as Agriculture Ambassadors and Agriculture Leadership Society, facilitate several outreach events to engage and excite prospective students in pursuing their higher education goals in agriculture at Cal Poly (CAFES Ag Council, 2018). In order to maintain growing student numbers, the Agricultural Education and Communication Department, specifically, the Agricultural Science major needs revamped recruiting efforts and ...


Cost Of Feed Per Pound Of Gain In Cal Poly's Dairy Calves, Kayle Anna Phelan Jun 2017

Cost Of Feed Per Pound Of Gain In Cal Poly's Dairy Calves, Kayle Anna Phelan

Agricultural Education and Communication

California is ranked one of the top five states in the United States for dairy production. It produces approximately 40 billion pounds of milk per year for US production. California’s dairy industry is not only the largest milk producer in the nation, but it is also the most financially prominent in the agricultural industry. This industry lead is purely because of its careful management practices. The way calves are raised depend on the resources used, the natural environment present, and the operation of the dairy farm. Essentially, there are numerous ways to care for a cow and calf. However ...


Comparison Of Foaming Properties Between Chelated Reconstituted Smp And Caseinates, Boya Liu Jun 2016

Comparison Of Foaming Properties Between Chelated Reconstituted Smp And Caseinates, Boya Liu

Master's Theses and Project Reports

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 ...


Study Of Rehydration Properties Of Powder Produced From Chelated Skim Milk, Kristina Ellice Tan Jun 2016

Study Of Rehydration Properties Of Powder Produced From Chelated Skim Milk, Kristina Ellice Tan

Master's Theses and Project Reports

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 ...


Separation And Characterization Of Reconstituted Skim Milk Powder Treated With Mineral Chelators, Amy Kringle May 2016

Separation And Characterization Of Reconstituted Skim Milk Powder Treated With Mineral Chelators, Amy Kringle

Master's Theses and Project Reports

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 calcium chelating ...


Methane Production By A Packed-Bed Anaerobic Digester Fed Dairy Barn Flush Water, Sean Richard Thomson Dec 2014

Methane Production By A Packed-Bed Anaerobic Digester Fed Dairy Barn Flush Water, Sean Richard Thomson

Master's Theses and Project Reports

Packed-bed digesters are an alternative to covered lagoon digesters for methane production and anaerobic treatment of dilute wastewaters such as dairy barn flush water. The physical media of packed-beds retain biofilms, often allowing increased treatment rates. Previous studies have evaluated several types of media for digestion of dilute wastewaters, but cost and media fouling have setback commercial development. A major operational cost has been effluent recirculation pumping.

In the present effort, a novel approach to anaerobic digestion of flush dairy water was developed at pilot-scale: broken walnut shells were used as a low-cost packed-bed medium and effluent recirculation was replaced ...


The Effects Of Different Cryopreservation Techniques On The Survival Rate Of In Vitro Produced (Ivp) And Biopsied Bovine Blastocysts, Diana J. Gumber Jun 2014

The Effects Of Different Cryopreservation Techniques On The Survival Rate Of In Vitro Produced (Ivp) And Biopsied Bovine Blastocysts, Diana J. Gumber

Animal Science

This study’s objectives were to determine if the biopsy of expanded blastocysts prior to cryopreservation affected the survival rates and determine if there is a difference between slow-freezing in 10% glycerol, slow freezing in ethylene glycol, and vitrification in terms of survival rate of the embryos. Blastocoeles were reduced prior to cryopreservation by means of biopsy. Embryos for slow freezing were exposed to ethylene glycol (SynGRO Ethylene Glycol with Sucrose, BIONICHE, Pullman, WA, USA) or 10% glycerol (SynGRO 10% Glycerol, BIONICHE, Pullman, WA, USA) as cryoprotectants. Vitrified embryos were exposed to 10% and 40% ethylene glycol. Survival rate of ...


The Effects Of Implementing Cow Cooling For Oostdam Dairy: Benefits From Milk Production, Feed Intake, And Reproduction, Mark Oostdam Mar 2014

The Effects Of Implementing Cow Cooling For Oostdam Dairy: Benefits From Milk Production, Feed Intake, And Reproduction, Mark Oostdam

Dairy Science

Heat stress has a major effect on management decisions for a dairy operation because of the decrease in the cows productivity. Dairy cattle loose efficiency of economic production due to lower milk yields and decreased pregnancy rates. Milk loss due to heat stressed cows in California averages a loss of 293 kg of milk/cow/year(St.-Pierre et al., 2003), and with milk prices reaching record highs, dairies are losing out on increased revenue opportunity. Increases in reproductive infertility from heat stress also affect revenue for a dairy operation by reducing conception rates (Hansen 1997) and pregnancy rates, which ...


Development Of Applied Standard Operating Procedures And Monitoring Practices, Nick Southfield Mar 2014

Development Of Applied Standard Operating Procedures And Monitoring Practices, Nick Southfield

Dairy Science

Development of a standard operating procedure program for Southfield Dairy was chosen in order to improve the work environment and animal health with an underlying goal to improve profitability. Critical control points for the milk barns, maternity barn and calf barn on the dairy, were identified as being critical to the production of quality milk, both for sale and calf feed. Data recording implementation through identification of recordable data, equipment purchases, and log sheet production, was done so to increase relevant information available for veterinary services and specialty consultants. Implementation of procedural documents and training programs are discussed to see ...


Effects Of Covering System, Sealing Time, And Packing On Fermentation, Nutritional Quality, And Organic Matter Loss Of Corn Silage In A Drive-Over Pile, Katie Rose Nutcher Mar 2014

Effects Of Covering System, Sealing Time, And Packing On Fermentation, Nutritional Quality, And Organic Matter Loss Of Corn Silage In A Drive-Over Pile, Katie Rose Nutcher

Dairy Science

This project involved an experiment conducted using a 550-ton capacity drive-over pile of whole-plant corn silage. The main effects compared were: packing the final forage surface with a loader or crawler, delay or immediate sealing, and covering with standard plastic or an oxygen barrier film.

Numerous studies have shown that the absence of oxygen in silage stored in a bunker silo or pile is crucial for proper fermentation and to ensure the highest quality silage at feed out. When oxygen is allowed to permeate through the covering material, it leads to visible spoilage. This trial showed that the oxygen barrier ...


Preparing Samples Of Rancid Milk For Milk Judging Contests, Danielle Li Mar 2014

Preparing Samples Of Rancid Milk For Milk Judging Contests, Danielle Li

Dairy Science

Due to the growing concern of raw milk, there is a growing need for other methods of preparing rancid milk for milk judging. The origin of rancidity in milk is due to lipolysis caused the lipase enzyme. However, with pasteurization, the lipase enzyme is inactivated. The purpose of this experiment was to compare the effect of using lipase powder to other current methods of preparing rancid milk, such as utilizing raw milk. Result showed that all treatments caused desired rancidity. The second purpose was to compare the rancidity between Method A, two to three hour incubation at room temperature, and ...


A Recommendation For The California Dairy System Reform Based On A Comparative Study Of Dairy Market Structuring And Pricing Systems Of Seven Leading Dairy Industries In 2014., Meredith Frisius Mar 2014

A Recommendation For The California Dairy System Reform Based On A Comparative Study Of Dairy Market Structuring And Pricing Systems Of Seven Leading Dairy Industries In 2014., Meredith Frisius

Dairy Science

No abstract provided.


Best Management Practices For Raising Dairy Calves From Birth To Weaning, Alexa Cabral Mar 2014

Best Management Practices For Raising Dairy Calves From Birth To Weaning, Alexa Cabral

Dairy Science

There are many different ways to raise calves on dairy farms in the United States. The way calves are raised can depend on the resources, natural environment and operation of the farm. There is no right or wrong way to raise calves. However, the aim of raising calves is to find the best way to raise a healthy calf so that she will become a productive cow. The objective of this literature review was to determine the ideal management practices for raising a healthy calf from birth to weaning. This literature analyzed numerous articles that covered all aspects of calf ...


Setting Up A Safety Program For California Dairies., Shelby Locke Mar 2014

Setting Up A Safety Program For California Dairies., Shelby Locke

Dairy Science

The purpose of this project was to take the best research for dairy safety in California and combine it in everyday terminology that the average dairy producer could understand. In today’s dairy industry, money is tight and decreasing costs is very important. By implementing a safety program that is in compliance with CAL/OSHA’s standards, injuries will decrease, saving the dairy producer money. This paper has highlighted the major topics for a new dairy to start their safety training program. It includes descriptions of the hazards, responsibilities for employers and employees and ways to prevent accidents from occurring ...


The Analysis Of Solar Photovoltaic Power System On A Large Central Valley Dairy Farm, Brogan Rose Fernandes Mar 2014

The Analysis Of Solar Photovoltaic Power System On A Large Central Valley Dairy Farm, Brogan Rose Fernandes

Dairy Science

The objective of this paper was to determine the financial benefits of installing a PV solar system on a dairy farm in California to create a more efficient and profitable business. The data used was based off Fernoak Farms electrical bills from Southern California Edison before and after solar installation. The background knowledge of how PV solar systems work and their design was incorporated, along with the research of the past, present, and future solar markets. The characteristics of energy consumption on an average dairy farm is given to show the amount of electricity needed to keep the dairy facility ...


Using Progesterone As An Indicator Of Ovarian Response To Stimulation In Cattle, Kayla Mariah Kauffman Mar 2014

Using Progesterone As An Indicator Of Ovarian Response To Stimulation In Cattle, Kayla Mariah Kauffman

Animal Science

No abstract provided.


The Effects Of Substituting True Protein With Non-Protein Nitrogen In Holstein Dairy Heifers Precision-Fed Different Forage To Concentrate Ratios, Noe Alberto Gomez Mar 2014

The Effects Of Substituting True Protein With Non-Protein Nitrogen In Holstein Dairy Heifers Precision-Fed Different Forage To Concentrate Ratios, Noe Alberto Gomez

Animal Science

Understanding the efficiency and digestibility of dietary nutrients in dairy heifers is essential for minimizing costs and environmental impacts of the dairy industry. The objective of this study was to interpret the effects of manipulating rumen-degradable protein (RDP) in a precision feeding system. Eight Holstein ruminally cannulated heifers (14.6 ± 0.1 mo of age, and 386 ± 9.1 kg of weight) were randomly assigned to 2 forage levels: HC (25% forage) and LC (75% forage) and to a degradable protein sequence [0% degradable protein from urea U, 100% casein C (no urea treatment U0); 33% U, 67% C (low ...


A Literature Review On Injection-Site Lesions In Dairy Cows And Culling Decisions, Eric B. Parsons Mar 2014

A Literature Review On Injection-Site Lesions In Dairy Cows And Culling Decisions, Eric B. Parsons

Dairy Science

Currently dairy producers face particular problems concerning their culled cows and bulls, these problems must be addressed so dairy producers have the opportunity to improve the quality of beef produced from their cull dairy cows. At the moment, not much is known about culling decisions outside “break-even” numbers and poor cow conditioning. This literature review outlines the strategy behind culling decisions and looks into potential plans to develop progressive body conditioning and quality of meat sent to auction. Currently the dairy industry is not placing much demand into providing the livestock auctions and harvest plants with higher quality meat. This ...


Haccp-Based Program For Central Coast Creamery: A Small-Scale Artisan Cheese Production Facility, Catherine Machado Mar 2014

Haccp-Based Program For Central Coast Creamery: A Small-Scale Artisan Cheese Production Facility, Catherine Machado

Dairy Science

This project was designed to outline a HACCP-based program that could be used for the start-up of Central Coast Creameries personal plan. The goal was to first provide a layout to more easily distinguish the hazards that the plant might face. After doing so the HACCP plan was made to eliminate those hazards both efficiently and successfully.


Effects Of Alternative Protein Milk Replacer Versus All-Milk Protein Milk Replacer On Weight Gain And Grain Intake In Pre-Weaned Dairy Calves, Kayla Sandoval Mar 2014

Effects Of Alternative Protein Milk Replacer Versus All-Milk Protein Milk Replacer On Weight Gain And Grain Intake In Pre-Weaned Dairy Calves, Kayla Sandoval

Dairy Science

The objective of this study was to determine if there was a significant difference in weight gain and grain intake between Holstein calves fed milk replacer with an alternative protein source and an all-milk replacer. The study took place on a large commercial calf operation in the Central Valley of California. All calves on trial were Holstein bull calves and started the trial within three to ten days of birth. Calves on trial were weighed a total of four times. The 236 treatments did not start until the second weight was measured at about 30 days of age and was ...


Improving Cow Comfort To Reduce Health Issues And Increase Milk Yield On Dairy Farms, Shonlyn Ferrari Mar 2014

Improving Cow Comfort To Reduce Health Issues And Increase Milk Yield On Dairy Farms, Shonlyn Ferrari

Dairy Science

In recent years the dairy industry has been looking more and more into cow comfort. This is because there are many benefits to ensuring cows are in some of the best new facilities. I looked into some of the major issues relating to cow comfort which include how to improve your own dairy, what health problems are common with inadequate cow comfort, and how these issues relate back to milk yield. First cow comfort is outlined and explained, then health problems are shown to be caused by improper cow care and lastly how cow comfort can improve milk yield. In ...


The Implications Of Global Warming Upon United States Dairy Herds: Effects On The Economics Of Dairying And Stability Of Herds With Low Genetic Diversity, Lauren Lusby Mar 2014

The Implications Of Global Warming Upon United States Dairy Herds: Effects On The Economics Of Dairying And Stability Of Herds With Low Genetic Diversity, Lauren Lusby

Dairy Science

Global warming (GW) is of real concern for the current U.S. agricultural industry. The agricultural industry has had a hand in emitting into the atmosphere. Severe heat spells seen nationwide and volatile climate shifts have pushed states such as California to implement governmental support to high impact areas due to dwindling water sources. Motivated dairy industry members have created plans to reduce dairy GHE contribution. Some research has suggested a benefit in GHG emissions from fewer cow-higher production approaches to dairy farmers. Most U.S. dairy cattle are specialized due to high inbreeding values created by selecting for few ...


A Review Of Mastitis Control Practices, Rebecca Gooder Feb 2014

A Review Of Mastitis Control Practices, Rebecca Gooder

Dairy Science

No abstract provided.


Grass-Fed Dairy Steer Enterprise Analysis For Alexandre Family Ecodairy Farms, Joseph Jackson Alexandre Jun 2013

Grass-Fed Dairy Steer Enterprise Analysis For Alexandre Family Ecodairy Farms, Joseph Jackson Alexandre

Agribusiness

Alexandre Family EcoDairy Farms (AFEF) is a family dairy farm, producing organic milk in northern California. In the last decade, AFEF has been expanding in value added natural food enterprises, including pastured free-range eggs, pastured pork and grass-fed beef.

This study focuses on the analysis of an organic grass-fed ground beef from dairy-beef cross steers coming from AFEF. The grass fed beef enterprise was analyzed by adopting a UC Davis cost and returns study, modifying it to AFEF production limitations and conditions. Through partial budgeting analysis, opportunity costs were discovered leading to breakeven prices for the final grass fed ground ...


Reproductive Analysis Of 100% Delayed 1st Service Ovsynch Breeding During Summer Months At A Large Central Valley Dairy, Micah John Degroot Mar 2013

Reproductive Analysis Of 100% Delayed 1st Service Ovsynch Breeding During Summer Months At A Large Central Valley Dairy, Micah John Degroot

Dairy Science

As the Dairy industry evolves year by year it is becoming ever more important to be reproductively efficient. The implementation of various timed artificial insemination (TAI) programs has become very common in order to maintain reproductive stability throughout the herd. This can be harder than ever with the increase of herd sizes and hot summer temperature in the central valley. The objective of this study compares two ovsynch breeding programs during summer months on a large central valley dairy. The change in protocol was a delayed 100% timed artificial insemination at approximately 70 dim for the 5-month period from June ...


Gas Emissions And Olfactometry For Dairy Heifers, Rebecca Gary Mar 2013

Gas Emissions And Olfactometry For Dairy Heifers, Rebecca Gary

Dairy Science

The objective of this study was to determine any trends in odor evaluations and gas emissions of manure samples in heifers fed high/low concentrate and high/low forage diets. Heifers (n = 8) were enrolled randomly in a split plot design with diet type (high concentrate vs. low concentrate) as the whole plot and forage quality (4 different levels of corn stover within each diet type) as sub-plots in a 4-period (21d) 4X4 Latin square design. Total collection of urine and feces was performed on days 18-21 of each period. The feces to urine ratio (F:U) was determined on ...


A Business Model For The Small-Scale, Start-Up, Organic Jersey Dairy, Jim Moreda Mar 2013

A Business Model For The Small-Scale, Start-Up, Organic Jersey Dairy, Jim Moreda

Dairy Science

To determine the financial feasibility and stability of starting a small-scale organic jersey dairy in Northern California, given the changes and restrictions that must take place in all aspects of production while operating organically. Using a unique combination of ownership and borrowing, I have created a business model made to appropriately fit the organic dairy system, addressing every area of the operation whether it be business or animal related. Through experience, reviews, and research of organic techniques allowable to apply, I was able to reveal and identify specific areas of husbandry and financing in which I would need to excel ...


Sire Evaluation For Milking Duration, James Macedo Mar 2013

Sire Evaluation For Milking Duration, James Macedo

Dairy Science

The objective of this study was to utilize electronically recorded data from on-farm milk recording systems and herd management software to determine if a sire has a genetic influence on his daughter’s milking duration. Measurements of milking duration from three dairy facilities were taken between January 27, 2013 and January 31, 2013. These measurements supplied 25,070 observations, corresponding to 9,418 cows and 895 sires. These data were evaluated with a SAS alongside a herd-mate comparison. The statistical analysis demonstrated that a sire does have a genetic influence on the milking duration of his progeny. The Van Beek ...


A Review Of The History And Motivations Of Animal Identification And The Different Methods Of Animal Identification Focusing On Radiofrequency Identification And How It Works For The Development Of A Radiofrequency Identification Based Herd Management System On The Cal Poly Dairy, Manuel Silveira Mar 2013

A Review Of The History And Motivations Of Animal Identification And The Different Methods Of Animal Identification Focusing On Radiofrequency Identification And How It Works For The Development Of A Radiofrequency Identification Based Herd Management System On The Cal Poly Dairy, Manuel Silveira

Dairy Science

My objective for this senior project was to perform an extensive review of literature on the history of animal identification and common motivations for identifying livestock, the different types and methods of identifying animals, with a special focus on radiofrequency identification technology (RFID) and how it works. A secondary objective was creating an instructional booklet for the implementation of a RFID based management system on the Cal Poly dairy. The identification of livestock for management or disease traceability has been a practice in one form or another for centuries (Blancou, 2001). Today, animal identification is of great importance to herd ...