Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 12 of 12
Full-Text Articles in Entire DC Network
Lactational Performance And Energy Partitioning Of Dairy Cows Supplemented With N-Acetyl-L-Methionine During Mid To Late Lactation, Tyson George Grisenti
Lactational Performance And Energy Partitioning Of Dairy Cows Supplemented With N-Acetyl-L-Methionine During Mid To Late Lactation, Tyson George Grisenti
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The N-acetyl-L-methionine (NALM) molecule is a methionine (Met) derivative produced via acetylation of the L-Met α-amino group with an N-acetyl group. This molecule has been shown to be bioavailable and capable of fulfilling the dietary requirement for Met in animals and humans. The current experiment was conducted to test a hypothesis that lactating dairy cows fed with NALM would increase milk production by increasing N and energy utilization efficiencies in a dose dependent manner. Eight multiparous Holstein cows that were mid lactation (124 ± 13 days-in-milk) with similar milk production were used in a 4 x …
Improvement Of Nutrient Utilization Efficiency, Ruminal Fermentation And Lactational Performance Of Dairy Cows By Feeding Birdsfoot Trefoil, Rachael G. Christensen
Improvement Of Nutrient Utilization Efficiency, Ruminal Fermentation And Lactational Performance Of Dairy Cows By Feeding Birdsfoot Trefoil, Rachael G. Christensen
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Condensed tannins (CT) are compounds that have shown potential to reduce the environmental impact of dairy farming waste products. In two live animal studies and a continuous culture study, it was hypothesized that feeding birdsfoot trefoil (Lotus corniculatus, BFT), a CT-containing legume, would improve nutrient utilization, milk, and component yield of dairy cows compared with feeding alfalfa hay or grass pasture in two studies, while feeding BFT forage would decrease methane production and improve rumen fermentation in addition to concentrate supplementation was the hypothesis of the third study. Reduction in milk urea nitrogen (MUN) and …
Physiological Impacts And Lactational Performance Of Dairy Cows Fed Brown Midrib Corn Silage During Dry Period Through Early To Midlactation, Alexandra Windley Kelley
Physiological Impacts And Lactational Performance Of Dairy Cows Fed Brown Midrib Corn Silage During Dry Period Through Early To Midlactation, Alexandra Windley Kelley
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Developing solutions to the metabolic stress experienced by cows during the transition period is very important because it can negatively influence lactational performance. The objectives were to: 1) compare physiological changes through body weight (BW) and concentrations of non-esterified fatty acids (NEFA) and β-hydroxybutyric acid (BHBA) and 2) evaluate feed intake, milk production, and energy balance (EB) of cows fed brown midrib corn silage (BMRCS)-based diets when compared with conventional corn silage (CCS)-based diets during the transition. At 4 wk prior to parturition, 40 dry multiparous Holstein cows …
Effects Of Rumen-Protected Amino Acids On Production In Holstein Cows, David Paul Dawson
Effects Of Rumen-Protected Amino Acids On Production In Holstein Cows, David Paul Dawson
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Six nonlactating Holstein cows fitted with rumen and duodenal cannula were used to determine the efficacy of pH sensitive fatty acid polymer encapsulation as a means protecting amino acids from rumen fermentation and as a post-ruminal amino acid delivery system. The cows were arranged in a 2 X 2 factorial in a Latin Square design. Treatments were 1) the basal ration, and 2) basal ration plus rumen-protected lysine, methionine, and threonine at 10 g each per day.
Rumen parameters measured were pH, ammonia, volatile fatty acids, protozoa, liquid, and dry matter rate of passage, total viable bacteria, and viable cellulolytic …
Effect Of Feeding A Viable Yeast Culture With Or Without Aspergillus Oryzae On Milk Production, Apparent Nutrient Digestibility, Ruminal Fermentation, And Nutrient Degradability In Holstein Cows, Daeyoon Kim
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Twenty-four early to midlactation Holstein cows were allocated to one of three treatments. Treatments consisted of: 1) basal ration plus 60 g wheat bran per day per head (control); 2) basal ration plus 57 g yeast culture per day per head; 3) basal ration plus 57 g yeast culture plus 3 g Aspergillus oryzae per day per head. Feed intake and milk yield were recoreded daily and milk composition and body weights were recorded weekly. Feed and fecal samples were recorded weekly. Feed and fecal samples were collected to determine apparent nutrient digestibility. No statistical difference was observed in milk …
The Heart Rate Responses Of Dairy Cows To Two Types Of Disturbances--Transportation And Aircraft Noises, Hoon M. Ahn
The Heart Rate Responses Of Dairy Cows To Two Types Of Disturbances--Transportation And Aircraft Noises, Hoon M. Ahn
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Three experiments were conducted using implanted heart rate (HR) transmitters. In the first experiment three lactating Holstein cows' HR signals were monitored telemetrically for three successive days under the normal herd management. Overall mean and standard error for these cows was 76.1 ± 0.46 bpm. In the second experiment the same three cows' HR signals were monitored with a portable computer and receiver. The cows were transported 400 kilometers one way over various road surface conditions. The HR signals were monitored consecutively at the beginning of the trip and at hourly intervals during travel. The cows stayed overnight and were …
Effect Of Bacterial Inoculant On Alfalfa Haylage: Ensiling Characteristics And Milk Production Response When Fed To Dairy Cows In Early Lactation, Barb Kent
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Third-cutting alfalfa hay harvested at bud stage in each of 2 yrs, treated with a live bacterial inoculant, packed in polyethylene-bonded bags and allowed to ensile. In both years, treated haylage had a lower pH, and a period effect was found for pH and mold count, regardless of treatment. In year 1, there was a period effect found for acid detergent fiber. In year 2, mean lactic-acid-producing bacteria numbers (log 10) were significantly higher for treated haylage (9.69 and 10.36) for control and treated haylage, respectively). Regardless of treatment, lactic-acid-producing bacteria numbers and water soluble carbohydrates significantly declined through time. …
Combined Scale Weight, Height At Hips And Visual Condition Score As An Indicator Of Functional Body Size In Range Cows, Patricia B. Davis
Combined Scale Weight, Height At Hips And Visual Condition Score As An Indicator Of Functional Body Size In Range Cows, Patricia B. Davis
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Thirty-five range cows of various breeds were obtained for the study. Body measurements taken were live weight and hip height and all cows were condition scored for level of fatness. The cows were slaughtered and the following morning several carcass measurements were taken and the plate was removed from the left side. These plates were boned and the remaining flesh ground for chemical analysis of percent carcass fat. Regression equations were calculated for estimating percent carcass fat from condition score, weight:height ratio and hip height (R2=.765). However, condition score alone is the single best estimator for percent carcass …
Effect Of Three Methods Of Processing Barley On Intake And Production Of Lactating Cows, Carlos Garcia Jauregui
Effect Of Three Methods Of Processing Barley On Intake And Production Of Lactating Cows, Carlos Garcia Jauregui
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Twenty-four lactating cows were randomly assigned to three treatments within eight each 3 x 3 latin squares with three periods of 21 days duration. Three processing treatments of barley were 1) steam-rolled, 2) ground (fine), and 3) soak-rolled (soaked in water for appr. 24 hours, rolled, and fed within 48 hours). All rations were fed ad libitum and were comprised of 24% alfalfa hay, 16% corn silage, 35.5% barley, 12% whole cottonseed, 12% wheat bran, 0.3% salt, and 0.3% dicalcium phosphate on a dry matter (DM) basis. Electronic doors were used to collect individual feed intake data. Rations and feces …
Lactation And Weaning Weight Relationships In Hereford And Simmental-Hereford Cows In Southern Utah, William E. Zimmerman
Lactation And Weaning Weight Relationships In Hereford And Simmental-Hereford Cows In Southern Utah, William E. Zimmerman
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Lactation and weaning weight relationships were studied in 37 cows grazing Southern Utah irrigated pastures during the summer of 1979. The herd included 23 Hereford cows ranging in age from 2 to 12 years and 14 Simmental-Hereford half-blood cows aged 3 to 9 years. The suckling calves were sired by Hereford bulls.
The average daily milk yield of 6.16 kg was affected by the cow breed. Simmental-Hereford cows produced 7.11 kg of milk per day, while the Herefords produced 5.21 kg per day. Milk production declined with increased days in lactation. The decline was linear in the Simmental- Hereford cows …
The Relationship Of Climatic Factors To Grazing Activities Of Cows On Winter And Spring Ranges, Benton M. Smith
The Relationship Of Climatic Factors To Grazing Activities Of Cows On Winter And Spring Ranges, Benton M. Smith
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The purpose of this research was to investigate the effects of climatic variations upon the daily activities of grazing cattle. The activities of individual cows on a partially seeded salt desert shrub range were observed and recorded during three grazing periods. Two of the periods were during consecutive winters and the other during the spring. Climatic variations during the second winter period were quantified and compared to changes in the daily activity patterns of the cattle.
Distinctly different daily routines of cattle activities were evident for the winter and spring seasons. In the spring, the cattle grazed, traveled, and drank …
Group Grain Feeding Versus Individual Grain Feeding Of Lactating Dairy Cows, Earl Max Sudweeks
Group Grain Feeding Versus Individual Grain Feeding Of Lactating Dairy Cows, Earl Max Sudweeks
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Grain feeding is an important part of a dairy feeding program. Grain supplies energy in a concentrated form and when fed as a supplement to forage permits cows to maintain high levels of production. Also, if the forage is of low quality, additional protein and other nutrients can be supplied with the grain in a concentrate mix. By feeding a balanced concentrate mix, according to individual production, each cow receives the necessary nutrients for production. Dairy cows are usually fed grain individually.