Life Sciences Commons^™

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

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

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 …

Management Intensive Grazing Systems And The Environment, Rhonda Miller, Jennifer W. Macadam, Rich Koenig

Agriculture

No abstract provided.

Management Intensive Grazing Systems And The Environment, Rhonda Miller, Jennifer W. Macadam, Rich Koenig

All Current Publications

No abstract provided.

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 …

Selection And Development Of Replacement Beef Heifers, Norris J. Stenquist, James A. Bennett

Archived Agriculture Publications

Selection, development, management, and nutrition of heifer calves to be used as herd replacements are key factors in maintaining beef herd productivity. A cow/calf producer, to be successful, must have some goals or criterion for heifer selection and development. For practically all Utah cattle production areas, economics dictate that heifers must calve as two-year-olds. Heifers must be properly developed and managed to permit this. The following factors are important: Heifers should 1) become pregnant in the first 25 days of the breeding season, 2) give birth to a live calf with little or no calving difficulty, 3) raise a calf …

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

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 …

Growth Stimulants And Feed Additives, Norris J. Stenquist

All Archived Publications

In recent years, the most revolutionary increases in beef cattle weights and feeding efficiencies have resulted from the development and use of growth stimulants, feed additives, and antibiotics. These nonnutritive products not only improve the rate and efficiency of gain but prevent certain diseases as well. Their use has significantly improved beef cattle production efficiency and provided a greater return per dollar invested than any other factor in the livestock industry. Growth stimulants deposit increased protein in the animal without changing protein or energy intake. They are designed to provide a constant slow release of active ingredients into the animal's …

Growth Stimulants, Nyle J. Matthews

Archived Agriculture Publications

A tiny pellet inserted under the skin of a calf's ear may increase weight gains as much as 15 to 20 percent. This same result would take years to accomplish through breeding and selection. These tiny pellets are growth stimulants. They are made of hormones that are constructed to slowly release minute amounts into the blood stream that stimulate the animal to produce natural body hormones. One of these hormones is a growth hormone. It regulates the rate of growth of the animal. Increasing the rate of growth will almost always improve feed efficiency and reduce maintenance costs. These pellets …

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

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

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

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

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

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.