Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Agriculture (127)
- Beef Science (49)
- Meat Science (36)
- Nutrition (33)
- Dairy Science (20)
-
- Medicine and Health Sciences (17)
- Other Animal Sciences (15)
- Veterinary Medicine (14)
- Genetics and Genomics (13)
- Food Science (12)
- Poultry or Avian Science (10)
- Education (8)
- Large or Food Animal and Equine Medicine (7)
- Agricultural Education (6)
- Food Processing (6)
- Bioresource and Agricultural Engineering (5)
- Engineering (5)
- Genetics (5)
- Agricultural Economics (4)
- Agronomy and Crop Sciences (4)
- Genomics (4)
- Physical Sciences and Mathematics (4)
- Plant Sciences (4)
- Veterinary Physiology (4)
- Adult and Continuing Education (3)
- Biochemistry, Biophysics, and Structural Biology (3)
- Comparative and Laboratory Animal Medicine (3)
- Environmental Sciences (3)
- Keyword
-
- Beef cattle (35)
- Cattle (23)
- Beef (21)
- Distillers’ grains (19)
- Methane (10)
-
- Corn residue (8)
- Corn silage (8)
- Grazing (7)
- Swine (7)
- Digestibility (6)
- Feedlot (6)
- Microbiome (6)
- Rumen undegradable protein (6)
- Supplementation (6)
- Finishing cattle (5)
- Flavor (5)
- Heifer development (5)
- Laying hens (5)
- Reproduction (5)
- Annual forages (4)
- Brassicas (4)
- By-products (4)
- DDGS (4)
- Distillers’ grains plus solubles (4)
- Field peas (4)
- Finishing (4)
- Forage intake (4)
- Forage quality (4)
- Genome-wide association study (4)
- Oxidation (4)
Articles 271 - 299 of 299
Full-Text Articles in Animal Sciences
Effect Of Brown Midrib Corn Silage And Dried Distillers Grains Plus Solubles On Lactational Performance And Nitrogen Utilization By Dairy Cows, Hugo A. Ramirez
Effect Of Brown Midrib Corn Silage And Dried Distillers Grains Plus Solubles On Lactational Performance And Nitrogen Utilization By Dairy Cows, Hugo A. Ramirez
Department of Animal Science: Dissertations, Theses, and Student Research
Thirty six Holstein cows, four ruminally cannulated, (mean ± SD, 111 ± 35 DIM; 664 ± 76.5 kg BW) were used in replicated 4×4 Latin squares to investigate the effects of brown midrib (bm3) and conventional (DP) corn silages, and the inclusion of dried distillers grains plus solubles (DDGS) on milk production and N utilization. In each 28 d period cows were assigned to one of four treatments: DP plus 0% DDGS (CON); bm3 plus 0% DDGS (BMR); DP corn silage plus 30% DDGS (DP+DG); and bm3 plus 30% DDGS (BMR+DG). Dry matter intake was greater (P < 0.01) for cows consuming bm3 (25.8 VS 24.4 ± 0.47 kg), likewise for DDGS (24.3 and 25.9 ± 0.47 kg/d for 0 and 30%). Compared to DP hybrid, NDFD was higher (P < 0.01) for bm3 (32.5 VS 38.1 ± 1.79%). There was a hybrid × DDGS interaction (P < 0.01) for total concentration of volatile fatty acids (VFA) and rumen pH as the highly digestible treatment BMR+DG resulted in the highest VFA and the lowest pH. Milk yield was not affected by treatment and averaged 30.6 ± 1.09 kg/d. Milk protein yield (MPY) was greater (P < 0.01) for bm3 and DDGS treatments. There was a hybrid by DDGS interaction (P = 0.02) for milk fat yield (MFY) resulting in 1.03, 1.08, 0.84 and 0.78 ± 0.045 kg/d for DP, BMR, DP+DG and BMR+DG. Fat corrected milk (FCM) was affected by DDGS (P < 0.01) and averaged 30.0 and 26.4 ± 1.0kg/d (0% and 30% inclusions). Urinary N excretion was similar among treatments; however fecal N was lower (P = 0.03) for diets containing bm3 corn silage which caused lower (P = 0.02) manure N. These results indicate that bm3 corn silage and DDGS increase DMI, NDFD and MPY; however high inclusion of corn silage with 30% DDGS reduces FCM. Nitrogen excretion was reduced when cows consumed bm3.
The Effect Of Vitamin E, Selenomethionine And Sodium Selenite Supplementation In Laying Hens, Alia Aljamal
The Effect Of Vitamin E, Selenomethionine And Sodium Selenite Supplementation In Laying Hens, Alia Aljamal
Department of Animal Science: Dissertations, Theses, and Student Research
In trial 1, 3 levels of dl-α-tocopheryl acetate (0, 50, 100 IU/kg), and 3 levels of supplemental sodium selenite (SS) (0, 0.25, 0.50 ppm), were added to a corn-soybean meal basal diet to evaluate their effects on egg quality variables, and deposition in egg yolk. Adding 50 IU/kg dl- α-tocopheryl acetate in the diet lowered aged yolk pH. Alpha-tocopherol in yolks increased with increasing vitamin E. As Se level increased in the diet, yolk Se content increased. There was a vitamin E by Se interaction affecting yolk Se content, but the highest level of Se in the yolk achieved when …
Replacement Of Grazed Forage With Wdgs And Poor Quality Hay And Straw Mixtures, Sandra B. Villasanti
Replacement Of Grazed Forage With Wdgs And Poor Quality Hay And Straw Mixtures, Sandra B. Villasanti
Department of Animal Science: Dissertations, Theses, and Student Research
A grazing study was conducted at the University of Nebraska Gudmundsen Sandhills Laboratory from mid-June to late-August across two years (2009 and 2010) to evaluate the effects of supplementation with mixtures of wet distillers grains (WDGS) and straw or hay on grazed forage intake. Twenty 1 ha paddocks replicated over two blocks were randomly assigned to one of four treatments: Control (CON) at the recommended stocking rate (1.68 AUM/ha in 2009 and 1.64 AUM/ha in 2010), and three double stocked treatments supplemented with 60% straw and 40% WDGS (STRAW), 60% hay and 40% WDGS (LOW), and 70% hay and 30% …
The Use Of High Distillers' Grains And Nutrient Management In Beef Feedlots, Amy R. Rich
The Use Of High Distillers' Grains And Nutrient Management In Beef Feedlots, Amy R. Rich
Department of Animal Science: Dissertations, Theses, and Student Research
Two experiments were conducted to determine the effect of feeding wet distillers grains (WDGS) at 70% and wheat straw at 25% (DM basis) on finishing steer performance and N mass balance in open feedlot pens. Four treatments were tested as a 2x2 factorial with factors being diet and pen cleaning frequency (monthly or at the end of the feeding period). In both experiments the CON treatment (corn based diet) had greater DMI, ADG, HCW, marbling and fat depth. There was greater N intake and N excretion for both the WINTER and SUMMER experiments on the WDGS. Not all the additional …
Obesity, Metabolic Hormone Signaling, And Granulosa Cell Gene Expression, Elizabeth Mack
Obesity, Metabolic Hormone Signaling, And Granulosa Cell Gene Expression, Elizabeth Mack
Department of Animal Science: Dissertations, Theses, and Student Research
It has become increasingly clear that female obesity is associated with a myriad of adverse side effects including abnormal female reproduction due, in part, to amenorrhea and anovulatory infertility. The lethal yellow (LY) mouse possesses a deletion mutation which results in ectopic expression of agouti and adult-onset obesity. Furthermore, LY mice exhibit premature loss of fertility, which has been associated with progressive obesity making the LY mouse line an excellent model to study the effects of obesity-dependent factors on ovarian function. In the current study blood serum and granulosa cells were obtained from LY (Ay/a) and age-matched B6 controls (C57BL/6J) …
Ethanol Byproduct Feeds: Determining Accurate Fiber Content, Nutrient Composition And Variability, Storing With Low-Quality Forages, And Fiber Utilization In Finishing Diets, Crystal D. Buckner
Ethanol Byproduct Feeds: Determining Accurate Fiber Content, Nutrient Composition And Variability, Storing With Low-Quality Forages, And Fiber Utilization In Finishing Diets, Crystal D. Buckner
Department of Animal Science: Dissertations, Theses, and Student Research
The growing ethanol industry has produced vast quantities of distillers grains plus solubles (DGS) in the wet (WDGS) and dry forms and Sweet Bran wet corn gluten feed (SB). Previous research has demonstrated that these byproduct feeds result in improved feeding values compared to grass in growing diets and corn in finishing diets, with positive economic returns. Four experiments were conducted to evaluate dry matter determination methods and variability of nutrient composition for WDGS, determining the accurate method for measuring NDF in corn and DGS, compare feeding WDGS mixed with straw as either fresh or ensiled, and evaluate fiber digestibility …
Distillers' Grains With Solubles For Feedlot Cattle: Finishing Performance, Lipid Metabolism, And Ethanol Greenhouse Gas Balance, Virgil R. Bremer
Distillers' Grains With Solubles For Feedlot Cattle: Finishing Performance, Lipid Metabolism, And Ethanol Greenhouse Gas Balance, Virgil R. Bremer
Department of Animal Science: Dissertations, Theses, and Student Research
Previous University of Nebraska feedlot research trials have characterized the feed value of wet distillers grains plus solubles (WDGS). These trials were summarized with meta-analysis methodology and indicated the feed value of WDGS interacts with corn processing type, cattle age (calf-fed or yearling), and inclusion level. Two steer finishing studies and a metabolism study were conducted to understand the impact of different lipid sources in WDGS on WDGS feed value. A biphasic lipid extraction procedure was developed to analyze feed samples from these trials that was more effective than Goldfisch ether extraction at lipid analysis of byproduct feds. These trials …
Fertilization And Supplementation Strategies For Steers Grazing Smooth Bromegrass Pastures, Andrea K. Watson
Fertilization And Supplementation Strategies For Steers Grazing Smooth Bromegrass Pastures, Andrea K. Watson
Department of Animal Science: Dissertations, Theses, and Student Research
Since 2004, fertilizer prices have doubled due to increases in energy prices for production and increased demand for N fertilizer due to high grain prices. This leads to questioning the cost effectiveness of increasing forage production with N fertilizer. At the same time, an increase in ethanol production creates an increase in the production of by-products of the ethanol industry, such as distillers grains. Distillers grains have been shown to be an excellent feed for ruminants both as a supplement while grazing and as part of a complete diet in the feedlot. Distillers grains provide protein, fat, and highly digestible …
Strategies For Beef Cattle Adaptation To Finishing Diets, Ractopamine Hydrochloride Utilization, And Mature Size Genetic Selection, Marco G. Dib
Department of Animal Science: Dissertations, Theses, and Student Research
A cattle finishing experiment was conducted to evaluate effects of intermittent feeding of Optaflexx compared to none or continuous feeding. Four treatments were evaluated, the negative control consisted of 63 days on the same diet without Optaflexx, wherea the positive control consisted of Optaflexx supplemented daily during the last 35 days before harvest. The 4-day intermittent treatment consisted of feeding Optaflexx for7 days, followed by 4 days of no Optaflexx, and the 7-day intermittent treatment 7 d on Optaflexx, followed by 7 days off. Regardless of the delivery pattern, feeding Optaflexx increased ADG, DMI, and live BW compared to negative …
Effects Of Dietary Choline, Folic Acid And Vitamin B12 On Laying Hen Performance, Egg Components And Egg Phospholipid Composition, Pradeep Krishnan Rajalekshmy
Effects Of Dietary Choline, Folic Acid And Vitamin B12 On Laying Hen Performance, Egg Components And Egg Phospholipid Composition, Pradeep Krishnan Rajalekshmy
Department of Animal Science: Dissertations, Theses, and Student Research
In trial 1, a corn-soy basal diet was formulated with three levels of supplemental choline (0, 500 and 1000 ppm) and three levels of supplemental folic acid (0, 2 and 4 ppm) in a 3 x 3 factorial arrangement. Folic acid at 2 ppm increased egg production (p ≤ 0.04). Egg wt was higher at 500 ppm of choline (p ≤ 0.06) and 0 ppm (p ≤ 0.01) of folic acid supplementation. There were choline by folic acid interaction effects on feed intake (p ≤ 0.001), albumen wt (p ≤ 0.005) and yolk wt ( …
The Effects Of Phytase And An Enzyme Combination In Moderate And Low Nutrient Dense Diets In Laying Hens, Dana L. Hahn
The Effects Of Phytase And An Enzyme Combination In Moderate And Low Nutrient Dense Diets In Laying Hens, Dana L. Hahn
Department of Animal Science: Dissertations, Theses, and Student Research
The objective was to test the addition of Avizyme ® 1502, a blend of protease, amylase and xylanase (Danisco, UK Ltd.) and a phytase in laying hens fed corn-soy diets containing Dried Distillers Grains (DDGS), Meat and Bone Meal (MBM). 384 Hy-Line W-36 laying hens were used in this study from 24-52 weeks of age. There were 12 replicate pens with 4 hens per pen, thus 96 pens in total. The study consisted of 8 dietary treatments arranged in a 2x2x2 factorial design. The factors were: diet (containing DDGS or MBM), metabolizable energy (ME) level 2930 Kcal/kg (Phase 1), 2880 …
Alteration Of Vascular Endothelial Growth Factor A (Vegfa) Isoform Expression Results In Abnormal Gonadal Function, Ningxia Lu
Department of Animal Science: Dissertations, Theses, and Student Research
In the female, vascular endothelial growth factor A (VEGFA) isoforms regulate follicle development and affect the initial primordial follicle pool. In male rodent testes, they are involved in the development of vasculature and seminiferous cords. The objective of the current study was to evaluate effects of Sertoli and Granulosa cellspecific production of VEGFA isoforms on vascular development and gonadal morphogenesis. We used a DMRT1-cre crossed to a floxed VEGFA mouse to determine potential phenotypes in male Sertoli-cell (VEGFA-DSertG) and female Granulosa-cell (VEGFA-DGranG) specific knockouts. In females, we found smaller ovarian weight, fewer corpus luteums (CLs) with some abnormal CL morphology, …
Interaction Between Roughages And Corn Milling Byproducts In Finishing Cattle Diets, Joshua R. Benton
Interaction Between Roughages And Corn Milling Byproducts In Finishing Cattle Diets, Joshua R. Benton
Department of Animal Science: Dissertations, Theses, and Student Research
During ethanol production, starch is the primary nutrient fermented and the remaining byproducts are excellent sources of fiber and protein. In addition, inclusion of byproducts in finishing diets may reduce the incidence of acidosis. As a result, roughage level and quality could potentially be reduced in finishing diets containing byproducts. Three experiments were conducted to examine the effects of roughage and wet corn gluten feed (WCGF) in finishing cattle diets containing corn distillers grains plus solubles. Cattle fed finishing diets containing wet distillers grains plus solubles (WDGS) with no roughage had decreased DMI and ADG compared to cattle fed roughage. …
The Effect Of Natural Antimicrobial Ingredients On The Quality Of Roast Beef And Oven Roasted Turkey, Ace F. Vandewalle
The Effect Of Natural Antimicrobial Ingredients On The Quality Of Roast Beef And Oven Roasted Turkey, Ace F. Vandewalle
Department of Animal Science: Dissertations, Theses, and Student Research
This research evaluates the use of a buffered vinegar and lemon juice concentrate (LV) solution on the quality of restructured beef and turkey rolls. Two studies were conducted to evaluate processing and ingredient concentration. Beef and turkey rolls were formulated with minimal ingredients. 1.5% sea salt, 0.5% turbinado sugar, with LV or no LV. Study one evaluated length of mixing time (2.5, 5, 10, 15, 20 minutes) on quality and sensory attributes with 2.5% LV or 0% LV (C). Study two was divided into four treatments, 0% (C), 1.5%, 2.5%, and 3.5% LV, used to evaluate the effects of three …
Acid Marination For Tenderness Enhancement Of Beef Bottom Round, Jeremey B. Hinkle
Acid Marination For Tenderness Enhancement Of Beef Bottom Round, Jeremey B. Hinkle
Department of Animal Science: Dissertations, Theses, and Student Research
Acid marination is known to improve meat tenderness. The objective of this study was to document the tenderness and color effects of marinating m. biceps femoris and to determine optimal acid levels. Acid solutions were prepared to 0.1 M (low) and 0.5 M (high) and pumped to 7% of initial wt. in experiment 1; 0.75 M (low) and 1.5 M (high) and pumped to 10 % of initial wt. in experiment 2. Lactic acid, acetic acid and sodium citrate dihydrate (food grade citric acid) at low and high concentrations gave 6 treatments per experiment. Objective color measurements were taken at …
Estimating Livestock Forage Demand: Defining The Animal Unit, Tonya L. Meyer
Estimating Livestock Forage Demand: Defining The Animal Unit, Tonya L. Meyer
Department of Animal Science: Dissertations, Theses, and Student Research
The objective of this experiment was to evaluate the effect of a beef animal’s physiological status on forage intake. The experiment was repeated over two years with six replications of three treatments per year: cow-calf pair (CC; BW = 629 kg), dry cow (DC; BW = 503 kg), and yearling steer (S; BW = 305 kg). The cow and calf were treated as one unit, with cow BW and calf BW comprising CC BW. Calves were approximately 42 d of age and weighing 73 kg at the start of each year. Animals were housed in individual pens and fed high …
Effects Of Feeding Distillers' Grains On Beef Quality, Amilton S. De Mello Jr.
Effects Of Feeding Distillers' Grains On Beef Quality, Amilton S. De Mello Jr.
Department of Animal Science: Dissertations, Theses, and Student Research
This research was conducted to understand the effects of feeding finishing diets containing distillers grains on beef quality. In the first and second studies, feeding wet distillers grains plus solubles (WDGS) increased proportions of PUFA, omega 6, omega 6/omega3, and trans fatty acids when compared to corn (P ≤ 0.05). Lipid oxidation was higher in muscles from animals fed WDGS when compared to corn (P ≤ 0.05). The third study examined the effects of feeding levels up to 50% of modified distillers grains plus solubles (MDGS) on fatty acid composition in beef. Linear increase (P ≤ 0.05) …
T10c12 Conjugated Linoleic Acid Causes Delipidation In 3t3-L1 Adipocytes And Mice, Shan Jiang
T10c12 Conjugated Linoleic Acid Causes Delipidation In 3t3-L1 Adipocytes And Mice, Shan Jiang
Department of Animal Science: Dissertations, Theses, and Student Research
T10c12 conjugated linoleic acid (t10c12 CLA) causes the reduction of triglyceride contents in adipocytes. T10c12 CLA’s delipidation effect is associated with decreased nutrient uptake, adipogenesis, lipogenesis, and increased energy expenditure, lipolysis, fatty acid oxidation in adipocytes. However, the molecular mechanisms of CLA’s delipidation effects are still unknown. AMP-activated protein kinase (AMPK), a central regulator of cellular energy levels, is activated by an increase in the cellular AMP:ATP ratio or various cellular stresses. We demonstrated that t10c12 CLA activated AMPK in 3T3-L1 adipocytes, leading to inhibition of anabolic biosynthesis and increase of energy expenditure. Strong activation of AMPK can induce an …
Transcriptional Regulation Of The Porcine Type Ii Gnrh Receptor Gene, Vanessa M. Brauer
Transcriptional Regulation Of The Porcine Type Ii Gnrh Receptor Gene, Vanessa M. Brauer
Department of Animal Science: Dissertations, Theses, and Student Research
The classical mammalian form of gonadotropin releasing hormone (GnRH), GnRH I, is a hypothalamic neuropeptide that functions as a key regulator of reproduction. The interaction between GnRH I and its receptor, GnRH receptor I (GnRHR I), stimulates gonadotropin secretion from the anterior pituitary gland. The gonadotropins, luteinizing hormone (LH) and follicle stimulating hormone (FSH), act on the gonads to stimulate either steroidogenesis and ovulation or gametogenesis, respectively. The steroid hormones produced in the gonads act through a feedback pathway to regulate the production of both GnRH I from the hypothalamus and gonadotropins from the anterior pituitary.
Another form of GnRH, …
Analysis Of Gnrh Receptor Gene Expression On Lines Of Swine With Divergent Ovulation Rates, Jacqueline E. Smith
Analysis Of Gnrh Receptor Gene Expression On Lines Of Swine With Divergent Ovulation Rates, Jacqueline E. Smith
Department of Animal Science: Dissertations, Theses, and Student Research
To examine the relationship between the molecular mechanisms underlying ovulation rate and transcriptional regulation of the porcine GnRHR gene, our laboratory has isolated the GnRHR gene promoter from the Control, Index and Meishan lines (McDonald, 2005). Previous work in our laboratory has indicated divergent luciferase activity among reporter vectors containing 5000 bp of 5’ flanking region for the porcine GnRHR gene from all three genetic lines transiently transfected into gonadotrope-derived αT3-1 cells (Fig 1.1; McDonald, 2005). This suggests differential mechanisms involved in the transcriptional regulation of the GnRHR gene among pig strains. Additionally, our laboratory identified a single base alteration …
Songs Of The Wild: Temporal And Geographical Distinctions In The Acoustic Properties Of The Songs Of The Yellow-Breasted Chat, Jackie L. Canterbury
Songs Of The Wild: Temporal And Geographical Distinctions In The Acoustic Properties Of The Songs Of The Yellow-Breasted Chat, Jackie L. Canterbury
Department of Animal Science: Dissertations, Theses, and Student Research
The Yellow-breasted Chat, Icteria virens, is a member of the wood-warbler family, Parulidae, and exists as eastern I. v. virens and western I. v. auricollis subspecies. It is the only wood-warbler known to sing diurnally and nocturnally.
One objective was to determine whether the eastern and western subspecies produce songs that differ acoustically; another was to determine whether a western population of Chats in Nebraska produces songs that differ acoustically at dawn and at night. Properties measured were maximum frequency, maximum power, notes/second, singing rate, and % time singing. In addition, the inter-song interval and % whistle notes were measured …
Attenuation Of Ruminal Methanogenesis, Eric J. Behlke
Attenuation Of Ruminal Methanogenesis, Eric J. Behlke
Department of Animal Science: Dissertations, Theses, and Student Research
Ruminal methanogens reduce carbon dioxide to methane (CH4), thereby preventing hydrogen use by bacteria for VFA synthesis resulting in a 2 to 12% loss in feed gross energy. Methane is a greenhouse gas that contributes to global warming. The objectives of this work were to determine: 1) the extent to which ruminal cultures acquire resistance to a nitrofuranyl derivative of para-aminobenzoate (NFP) and an extract from the plant Yucca shidigera (Yucca); 2) the effect of distillers dried grains plus solubles (DDGS) on ruminal CH4 production; 3) the effect of brome hay-based diets, corn-based diets, and in vivo …
Development Of A Set Of Forage Standard To Estimate In Vivo Digestibility Of Forages And Prediction Of Forage Quality Of Diets Consumed By Cattle Grazing Nebraska Sandhills Range Pastures, Bobbi Gene Geisert
Department of Animal Science: Dissertations, Theses, and Student Research
In beef cattle productions systems, feed costs accounts for the majority of production costs. In year-round grazing systems, knowledge of diet quality is important for supplement formulation and predicting animal response in order to meet production goals without increasing feeding costs. The objectives of these two trials were: to develop a set of feed standards to use in in vitro laboratory procedures to estimate in vivo digestibility of forages, determine the effect of moisture, day, and grazing level on diet quality, and develop prediction equations to estimate diet quality using the variables moisture, day and grazing level. Trial 1 used …
Factors Influencing Off-Flavor In Beef, Jennie Marie James Hodgen
Factors Influencing Off-Flavor In Beef, Jennie Marie James Hodgen
Department of Animal Science: Dissertations, Theses, and Student Research
Projects were conducted to increase knowledge of liver-like off-flavor origins in muscles from the beef chuck and round. Effects of cooking rate and holding time on off-flavor of various steaks from ten carcasses were determined. Off-flavor from these muscles was lowest when the steaks were cooked slowly (on a 149°C grill versus a 249°C grill) and when held for one hour prior to evaluation. The M. infraspinatus had the least off-flavor, and the M. vastus intermedius had the most intense off-flavor. These data suggest a carcass with one off-flavored muscle is likely to have other off-flavored muscles in the chuck …
Transcriptional Regulation Of The Gnrh Receptor Gene In Lines Of Swine Divergent For Ovulation Rate, Emily A. Mcdonald
Transcriptional Regulation Of The Gnrh Receptor Gene In Lines Of Swine Divergent For Ovulation Rate, Emily A. Mcdonald
Department of Animal Science: Dissertations, Theses, and Student Research
The interaction between GnRH and its receptor on gonadotropes within the anterior pituitary gland represents a central point for regulation of reproduction. Additionally, the close proximity of the porcine GnRHR gene to a quantitative trait locus for ovulation rate makes it a positional candidate for genes influencing ovulation rate. We isolated the GnRHR gene promoter from three lines of swine (Control, Index and Meishan) with different ovulation rates. Transient transfection of gonadotrope-derived αT3-1 cells with vectors containing approximately 5000 bp of GnRHR gene promoter fused to the cDNA encoding luciferase resulted in a 2- to 4-fold difference in luciferase activity …
Expression Analysis Of Gnrh Responsive Anterior Pituitary Genes In Lines Of Swine Divergent For Ovulation Rate, Benjamin E. Bass
Expression Analysis Of Gnrh Responsive Anterior Pituitary Genes In Lines Of Swine Divergent For Ovulation Rate, Benjamin E. Bass
Department of Animal Science: Dissertations, Theses, and Student Research
The interaction of GnRH with its receptor represents a crucial point for control of reproduction. Additionally, the porcine GnRH receptor (GnRHR) gene is a positional candidate for genes influencing reproductive efficiency, residing in a similar chromosomal region as a QTL for ovulation rate (OR). Gonadotropic gene expression in lines of swine divergent for OR may provide insight into the phenomena of increased litter size. Chinese Meishan (OR=14.5), a white crossbred line selected based on an index of OR and embryonic survival (OR=17.8), and a Control line (OR=13.2) were evaluated. Following three (Index and Control) or six (Meishan) estrous cycles, gilts …
Ação Regulatória Do Gnrh No Desenvolvimento Embrionário Precoce E Vitrificação De Embriões Suínos Pelo Método De Microgota (Role Of Gnrh During Early Embryonic Development And Development Of Swine Embryos Following Vitrification By Microdroplet Method), Marcelo Marcos Montagner
Department of Animal Science: Dissertations, Theses, and Student Research
The objective of this study was to investigate the role of GnRH on the preimplantation development of mouse embryos in vitro. GnRH-I, GnRH-II, and GnRH agonists: Des-Gly, Des-Trp and histrelin did not improve embryo development. However, treatment with the specific GnRH antagonist SB-75 blocked embryo development at morula stage. The inhibition of embryo development by SB-75 could be rescued by the addition of histrelin. To determine which intracellular signaling cascade is involved following binding of GnRH to the GnRHR, embryos were cultured in the presence of specific PKC (GFX) or PKA (SQ22536) inhibitors. The PKC inhibitor blocked embryo development at …
The Effect Of Fresh And Frozen Bellies On Bacon Processing Characteristics And Bacon Quality, Carmina Citlali Robles
The Effect Of Fresh And Frozen Bellies On Bacon Processing Characteristics And Bacon Quality, Carmina Citlali Robles
Department of Animal Science: Dissertations, Theses, and Student Research
The objective of the study was to evaluate the impact of fresh vs. frozen bellies on bacon parameters. Differences among bellies from pigs of different genetic lines and sexes were evaluated. A population of 578 pork bellies from barrows and gilts of Berkshire, Chester White, Duroc, Landrace, Poland China and Yorkshire lines were processed to sliced bacon and cooked bacon to be evaluated. Bellies were divided into two storage treatments: fresh (stored at 3°C) or frozen (held at -15°C). Fat samples were collected from each belly to establish a fatty acid profile. Differences in percent pump, smokehouse yield, slicing yield …
Strategy For The Conservation Of Non-Game Birds In The State Of Nebraska, Jacqueline Lee Canterbury
Strategy For The Conservation Of Non-Game Birds In The State Of Nebraska, Jacqueline Lee Canterbury
Department of Animal Science: Dissertations, Theses, and Student Research
Non-game birds comprise 93% of the 831 species recorded in the U.S; of these, forest birds and neotropical migrants have received considerable attention. To develop a management plan for non-game birds in Nebraska, historically a predominately grassland ecosystem, it was necessary to determine species in need of conservation and assess their respective habitat status. Using BBS and PIF databases, we developed a prioritization scheme that identified 44 breeding species in need of conservation in Nebraska; 20 of the 44 are grassland birds. Because several species in need of conservation known to occur in the state were missing from these databases, …