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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Effects of dietary vitamin A restriction on the site of fat deposition and fatty acid composition of growing cattle

Gorocica-Buenfil, Milton A. 16 November 2006 (has links)
No description available.
2

Effects of chilling duration on USDA quality grade of beef carcasses

Haines, Caitlyn Sarah 30 April 2021 (has links)
Two hundred and nine beef carcasses (361 ± 53 kg) from crossbred, grain-finished cattle harvested in a commercial packing plant and evaluated for marbling score, core temperature (n=1), pH, shrinkage, color, and aerobic plate count (n=50) for 24, 48, 72, and 96 h under spray chilling. There were minimal changes in shrinkage among time points (-0.4 to 1.2%; P ≤ 0.002), pH (5.56 to 5.69; P ≤ 0.001), and APC (0.1 to 0.7 log; P ˂ 0.001). Marbling score values were converted to numeric values of 200 (Practically Devoid00) to 1100 (Abundant00). Carcasses with SM or greater marbling score at 24 h had a 34 to 60 points deduction after 96 h of spray chilling (P ≤ 0.042), the SL carcasses had an increase marbling score, from 442 to 469 points. Moreover, SL carcasses had a greater percentage of PUFA (P < 0.001).
3

The use of different nutritional strategies and mathematical models to improve production efficiency, profitability, and carcass quality of feedlot cattle

de Vasconcelos, Judson Tadeu 25 April 2007 (has links)
Forty eight crossbred steers (BW = 296 ± 16.7 kg) were fed four dietary treatments for 56 d: AL-LS (low starch diet fed ad libitum for a rate of gain of 1 kg/d), AL-HS (high starch diet fed ad libitum), LF-HS (a limit fed high starch diet designed to be isocaloric with AL-LS), and AL-IS (a diet fed ad libitum for the midpoint daily energy intake between AL-LS and AL-HS). On d 57 all steers were placed on AL-HS for finishing until d 140. Steers that consumed more total energy (AL-HS and AL-IS) throughout production achieved greater carcass fatness in the end of the 140 d period, although these responses were difficult to evaluate via real-time ultrasound measurements. No differences in insulin and glucose kinetics were observed. Data suggested that energy source may influence energy partitioning during the growing period, but these effects may be overcome by differences in energy intake. Higher marbling scores (AL-HS and AL-IS) rewarded higher grid values and greater premiums, which increased profitability. This data set was also used for a model evaluation that showed that mathematical models (CVDS and NRC) were able to explain most of the variation in individual feed requirements of group- fed growing and finishing cattle. Another data set was used for evaluation of a decision support system Cornell Net Carbohydrate and Protein System (CNCPS) as a tool to minimize nutrient excretion from fed cattle. One-hundred eight-four group- fed steers were fed a 13% crude protein (CP) diet until reaching 567 kg of BW, when their diets were either maintained at 13% or reduced to 11.5% or 10% CP. Data from the second half of the experiment were modeled to predict urinary, fecal, and total N excretion. As dietary CP decreased from 13 to 11.5%, the model indicated a total N excretion of 16%. An even greater reduction in total N excretion (26%) occurred when dietary CP was decreased from 11.5% to 10%. The overall decrease from 13 to 10% CP resulted in a reduction of total N excretion by 38%. Data suggest that decision support sys tems can be used to assist in balancing diets to meet environment restriction.
4

Marmorierung und Architektur ein Beitrag zur Frage der Musterung /

Klein, Heinrich-Josef. January 1976 (has links)
Thesis--Köln. / Includes bibliographical references.
5

Marmorierung und Architektur : ein Beitrag zur Frage der Musterung /

Klein, Heinrich-Josef. January 1976 (has links)
Thesis--Köln. / Includes bibliographical references. Also issued online.
6

Marmorierung und Architektur ein Beitrag zur Frage der Musterung /

Klein, Heinrich-Josef. January 1976 (has links)
Thesis--Köln. / Includes bibliographical references.
7

Polymorfismus v genu DGAT1 ve vztahu k marblingu u skotu

Kučírek, Martin January 2014 (has links)
Intramuscular fat occurring in the muscle of cattle is supposed to be prerequisite for high-quality beef. Marbling has effect on juiciness, tenderness and flavor of the meat. Selection of cattle at higher marbling score brings increased meat tenderness. It is influenced by many factors, among which we classify genetic background, age of animal, nutrition, sex and pedigree of animal. The aim is to perform association analysis beetween dinucleotide polymorphism in the gene DGAT1 (diacylglycerol acyltransferase 1) and the marbling score. Part of thesis is elaboration of literature, present state of the problem, genes affecting metabolism of intramuscular fat in cattle, the role of the enzyme DGAT1 in the biosynthesis of triacylglycerols and its physiological function (energy metabolism, glucose metabolism, relation to fat accumulation and obesity). In this study a singificant difference of allelic contribution to intermuscular fat content in tested samples was found. Nevertheless, effect of Q allele was reverse than observed in similar studies.
8

Determination of the effect of branding on consumer palatability traits of ground beef and beef strip loin steaks

Wilfong, Alaena January 1900 (has links)
Master of Science / Department of Animal Sciences and Industry / Travis O’Quinn / The objectives of these studies were to determine how consumer palatability ratings of beef strip loin steaks and ground beef are affected when products are identified with a brand, USDA grade, or product type. Strip loins were selected to represent five quality levels and six ground beef treatments were chosen, representing a variety of fat levels and product types. After aging steaks for 14 d and ground beef for 8 d, 2.5 cm steaks and 151.2 g patties were formed. Consumer panelists evaluated samples for tenderness, juiciness, flavor liking, and overall liking as well as texture liking for ground beef samples. Additionally, consumers rated each palatability trait as either acceptable or unacceptable and rated the sample as either unsatisfactory, everyday quality, better than everyday quality, or premium quality. Samples were fed in two rounds – blind and informed testing. In the first round of blind testing, consumers were served one sample from each treatment with treatments not disclosed. For the second round of informed testing, USDA grade, or product information was disclosed prior to sampling. Samples evaluated by consumers were paired for blind and informed testing. During blind testing, Certified Angus Beef (CAB) steaks rated similar (P > 0.05) to Choice for all palatability traits; however CAB rated greater (P < 0.05) than Choice for all traits for informed testing. Additionally, Angus Select and Select steaks were rated similar (P > 0.05) when tested blind, but Angus Select was rated greater (P < 0.05) than Select for flavor and overall liking when treatment was informed. Prime, CAB, and Angus Select had increased (P < 0.05) ratings for flavor and overall liking due to brand disclosure. However, Choice and Select samples did not receive any increase (P > 0.05) in ratings for palatability traits when brand was informed. Multiple traits were rated greater for Prime, CAB, and Angus Select products indicating these products received a "brand lift" (change in ratings due to brand knowledge) in palatability due to brand identification. However, when brand information was disclosed for Choice and Select steaks, consumers indicated no increase in palatability perception. Few differences were observed in blind testing for ground beef; however, during informed testing, 90/10 CAB ground sirloin rated greater (P < 0.05) than all other products for all palatability traits besides juiciness. Increased (P < 0.05) ratings were found for CAB products for multiple traits while the only non-branded product that received increased (P < 0.05) ratings was 90/10 ground beef during informed testing. There were few differences among ground beef products when tested blind, indicating that during blind testing, brand, fat percentage, and subprimal source have little effect on ground beef palatability. However, when product and brand were identified, multiple treatments received increased ratings for palatability traits indicating branding and product type knowledge influence the palatability of ground beef.
9

Evaluation of the beef marbling insurance theory

Drey, Lindsey January 1900 (has links)
Master of Science / Department of Animal Sciences and Industry / Travis G. O'Quinn / The objectives of this study were to evaluate the extent marbling compensates for reduced beef palatability at elevated degrees of doneness and to determine the relationship of residual moisture and fat in cooked steaks to beef palatability, specifically beef juiciness. Paired strip loins (IMPS # 180) were collected to equally represent five quality treatments [Prime, Top Choice (modest and moderate marbling), Low Choice, Select, and Select Enhanced (110% of raw weight)]. Steaks were grouped into sets of three consecutively cut steaks and randomly assigned a degree of doneness (DOD): very-rare (VR; 55°C), rare (R; 60°C), medium-rare (MR; 63°C), medium (M; 71°C), well-done (WD; 77°C), or very well-done (VWD; 82°C). Samples were subjected to consumer and trained sensory evaluation, Warner-Braztler shear force (WBSF), slice shear force (SSF), pressed juice percentage (PJP) evaluation, and raw and cooked proximate analysis. There were no (P > 0.05) interactions for consumer sensory ratings, indicating increased DOD had the same negative impact regardless of marbling level. There was a quality treatment × DOD interaction (P < 0.05) for percentage of steaks rated acceptable by consumers for juiciness. Increased marbling extended the point in which steaks became unacceptable for juiciness. Similarly, there was a quality treatment × DOD interaction (P < 0.05) for trained juiciness ratings. When cooked to MR and lower, Prime was only rated 8 to 18% higher (P < 0.05) than Select for trained juiciness ratings but was rated 38 to 123% higher (P < 0.05) than Select when cooked to M and higher. Besides cook loss, combined cooked moisture and fat percentage was more highly associated (P < 0.01) to consumer juiciness (r = 0.69) and trained initial (r = 0.84) and sustained (r = 0.85) juiciness ratings than all other objective evaluations. For regression analysis, cooked moisture and fat percentages, alone, were poor indicators of consumer and trained juiciness ratings. However, when combined, the regression equations explained 45, 74, and 69% of the variation in consumer, trained initial, and trained sustained juiciness ratings, respectively. These results indicate that increased marbling levels only offer “insurance” for juiciness of steaks that are cooked at high degrees of doneness, but not for other palatability traits. Additionally, cooked residual moisture and fat percentages when combined are a good indicator of sensory juiciness ratings.
10

Effects of early weaning on finishing feed efficiency, marbling development and retail product quality of beef steers

Smith, Jason Kaleb 03 September 2015 (has links)
Beef cattle producers continuously search for nutritional management options that provide flexibility to production scenarios. Due to its positive effects on maternal productivity, early weaning is one such alternative strategy that has received considerable interest. To better understand the effects of early weaning on calf productivity, an extensive literature review and three experiments were conducted to evaluate the effects of early weaning on finishing feed efficiency, marbling development and retail product quality of beef steers. In experiment I, which included 90 Angus-sired steers from four calving seasons, early weaning followed by a short ad libitum concentrate-feeding and pasture-backgrounding phase reduced finishing residual feed intake (RFI) by 7 % (P < 0.0001) and increased carcass marbling score (MS) by 10 % (P < 0.01) when compared to conventionally weaned (CW) contemporaries. Similar effects were observed in experiment II, which included 28 Angus and Simmental-sired steers, as early weaning reduced RFI (P < 0.01) and increased carcass MS (P < 0.01). Lung mass of early weaned (EW) steers was greater than their CW contemporaries (P < 0.05), and was inversely related to RFI (R2 = 0.17; P < 0.05). Finishing treatments in this experiment included a high corn ration and an alternative low corn ration that iso-calorically replaced 50 % of the DM from corn with dried corn gluten feed. Iso-caloric replacement of corn reduced lung mass (P < 0.01), and when combined with the observed increase of EW steers suggests that lung development is affected by dietary energy type at various stages of growth. In experiment III, objective analyses of ribeye steaks obtained from steers included in experiment two revealed that early weaning increased cross-sectional muscle fiber area by 28 % (P < 0.001) and tended to increase (P = 0.08) Warner-Bratzler shear force by 36 %. Nonetheless, these effects were not great enough to alter un-trained consumer perception of texture (P ≥ 0.65), juiciness (P ≥ 0.55), flavor (P ≥ 0.25) or overall acceptability (P ≥ 0.34). Collectively, these results indicate that early weaning enhances finishing feed efficiency and carcass marbling without affecting un-trained consumer sensory perception. / Ph. D.

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