Effects of Ractopamine and Muscle Fiber Number on Swine Growth Performance, Carcass Traits, and Meat Quality PDF Download

Author: Louis W. Kutzler
Publisher:
ISBN:
Category :
Languages : en
Pages :

View

Book Description

Author: Claudia Andrea Elmes Hinojosa
Publisher:
ISBN:
Category :
Languages : en
Pages :

View

Book Description

Author: Katherine Suzanne Betts
Publisher:
ISBN:
Category :
Languages : en
Pages : 100

View

Book Description
Abstract: The study evaluated the effects of a 28 d pre-harvest ractopamine (RAC) feeding program on average daily gain (ADG), feed conversion efficiency (FC), backfat (BF) and loin muscle area (LMA), pork loin quality, and cortisol concentration in purebred Berkshire pigs (n = 117) utilizing a randomized complete block design with three treatments (Control (C), 0 ppm; RAC5, 5.0 ppm; RAC10; 10 ppm) in four replicates. Litter-mate pigs were randomly assigned to each of the three treatments within a replicate. Ultrasonic BF and LMA, pig weight, and salivary cortisol concentrations were measured at days 0, 7, 14, 21, and 28 of the feeding period. Blood was collected during harvest at exsanguination for plasma cortisol measurements. Carcass composition and pork quality (NPPC, 2000; visual color, marbling, firmness, and wetness and instrumental measures of ultimate pH and Minolta L*, a*, and b* were assessed at 24h post-harvest. Mixed model procedures of SAS were used in analyses. Fixed effects were treatment, sex, and a treatment x sex interaction, with sex and interaction effects removed if not significant (P> 0.10). Random effects included replication and litter nested within replication. Individual ADG was greater (P

Author: A. Rosati
Publisher: BRILL
ISBN: 908686564X
Category : Technology & Engineering
Languages : en
Pages : 370

View

Book Description
After the experience of the first volume, The World Association for Animal Production (WAAP) continues the publication of the Book of the Year series for the benefit of animal scientists and policy makers in the field of livestock systems. The WAAP asked the best known and significant animal scientists in the world to contribute to the preparation of this book. Following the success of the first volume of the series, the WAAP Book of the Year 2003, many authors from the six continents are contributing to this 2nd volume. The importance of this publication is to have already established a worldwide reference for the animal science and production sectors. There are the usual four sections that raised much interest in the previous volume of the series. The first section has six articles, describing the changing conditions of livestock systems in each of the six continents. The second section has more than twenty papers, describing the development of the many sectors in which the animal science field has been divided. The third section, dealing with contemporary issues, is declared by our readers to be the most interesting. It allows participating authors to describe current and significant issues important in these last years for the animal science and production sectors. The statistics produced in the previous volume are updated and enhanced with new figures in this book to form the fourth section. The papers included in this book speak clearly of the development in the last twelve months in the livestock systems worldwide. Major space is also devoted to the list of references from where every author can start to deepen his knowledge. This book is essential for libraries that want their readers to be easily updated. Also scientists, policy makers and scientific writers, who need, to enhance their competence, to have the most practical way of knowing what is going on in the world in the field of livestock science and production will find this book of great value.

Author: Mark Adam Frenzel
Publisher:
ISBN:
Category : Adrenergic beta agonists in animal nutrition
Languages : en
Pages : 68

View

Book Description
This study was conducted using 65 pigs to measure the effects of ractopamine hydrochloride (RAC) on growth and carcass characteristics of lightweight swine. Beginning weights averaged 68.23 kg. RAC was included in the diet at 0, 5, and 10 ppm for 25 days until an average weight of 92 kg. Last rib fat thickness was lower (P0.05) for the 5 ppm and 10 ppm groups. No other differences (P0.05) were found between treatment groups for growth, feed efficiency, carcass cutability, or pork quality traits. These results suggest that feeding ractopamine hydrochloride in lightweight swine diets can reduce last rib fat while not impacting growth or other carcass traits.

Author: Thomas Dean Bidner
Publisher:
ISBN:
Category : Pork
Languages : en
Pages : 286

View

Book Description

Author: Matthew Duane Asmus
Publisher:
ISBN:
Category :
Languages : en
Pages :

View

Book Description
Three experiments used 777 pigs to study the effects of fiber source; wheat middlings (midds), dried distillers grains with solubles (DDGS), and choice white grease (CWG), and reduction strategies for growing and finishing pigs. Also a fourth study utilizing 1,360 pigs was conducted to determine the effect of immunocastration (IC) and DDGS withdrawal on growth performance, carcass characteristics, fatty acid analysis, and iodine value (IV) of pork fat depots in growing and finishing pigs. Experiment 1 determined that the ingredient source of fiber (wheat middlings or DDGS) was more important than NDF level alone, for characterization of growth, carcass, and yield responses. Experiment 2 showed that a short (23 d) fiber reduction strategy was successful at fully recovering yield loss; however, a longer reduction (47 d) was necessary for further improvements in carcass fat quality (IV). Experiment 3 further proved that yield loss can be recovered with a short fiber reduction strategy (19 d), and that adding energy from CWG during the fiber reduction period can improve feed efficiency, but was unsuccessful at further improving carcass yield or carcass fat quality. Experiment 4 showed that carcass yield was lower for IC pigs than barrows regardless of dietary DDGS or withdrawal strategy. Also pigs fed 30% DDGS throughout had decreased carcass yield; however, withdrawing DDGS from the diet on d 74 was effective at recovering the yield loss. While DDGS withdrawal strategy was successful at lowering IV, but was unsuccessful at fully lowering IV to values of pigs fed the control diet throughout. Iodine values were somewhat variable within fat depot, showing the jowl and clear plate fat were less accurate in showing changes from the diet, most likely due to the fact they are deposited earlier and are slower to turnover. Iodine value tended to be greater for IC pigs than barrows on d 107, but by d 125 there were no differences in IV between IC and barrows. This dramatic improvement from d 107 to 125 could be caused by the dilution of unsaturated fatty acids, specifically C18:2 and C18:3, due to the rapid deposition of fat in IC pigs.

Author: Billy Greer Jackson
Publisher:
ISBN:
Category : Exercise
Languages : en
Pages : 62

View

Book Description

Author: Bailey Marie Edenburn
Publisher:
ISBN:
Category :
Languages : en
Pages :

View

Book Description

Author: Kyle Francis Coble
Publisher:
ISBN:
Category :
Languages : en
Pages :

View

Book Description
A total of 7,061 finishing pigs were used in 7 experiments. Experiment 1 investigated the effects of withdrawing high-fiber ingredients prior to marketing to optimize growth performance, carcass yield, and carcass fat quality. Switching pigs from a high-fiber to a low-fiber corn-soy diet approximately 15 to 19 d before slaughter restored carcass yield and partially decreased carcass fat IV compared to pigs fed the high-fiber diet until slaughter. Experiment 2 studied 30% distillers dried grains with solubles (DDGS) and 5% added fat prior to slaughter on growth performance and carcass characteristics. Adding 5% fat to finishing pig diets containing 30% DDGS approximately 20 d before slaughter improved ADG and G:F but did not overcome the reduction in carcass yield from feeding DDGS. Experiment 3 investigated the Cu source on growth performance and carcass characteristics. Increasing dietary Cu in high byproduct diets improved growth and feed intake, resulting in increased final BW and HCW for pigs fed both Cu sources. Experiment 4 examined added Cu and standardized ileal digestible (SID) lysine (Lys) level on growth performance, carcass characteristics, and carcass fat quality. Feeding 150 mg/kg Cu to pigs in the 100% SID Lys requirement diet had improved growth but in the 85 or 92.5% SID Lys requirement diet no response to added Cu was found. Furthermore, increasing SID Lys increased ADG and HCW, but added Cu did not influence growth when feeding low SID Lys. Experiment 5 investigated diet ingredient type and added Cu on growth performance, carcass characteristics, gross energy digestibility, and small intestine histology and gene expression. When comparing diet type and added Cu, pigs fed a byproduct diet with DDGS and bakery meal tended to have lower G:F and reduced HCW compared to pigs fed a corn-soy diet. Adding Cu did not influence growth or carcass characteristics. However, adding Cu to the byproduct diet improved gross energy digestibility and decreased the crypt depth in the distal small intestine. Finally, a linear programming model was developed as a decision tool for commercial swine producers to help guide pig flow decisions to maximize the return to the operation.