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Estimates Of Genetic Parameters For Female Fertility Traits From A Dairy Selection Experiment For Fat Plus Protein By Using Random Regression And Linear Threshold Animal Models
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Book Synopsis Estimates of Genetic Parameters for Female Fertility Traits from a Dairy Selection Experiment for Fat Plus Protein by Using Random Regression and Linear-threshold Animal Models by : Gustavo Augusto Gutierrez
Download or read book Estimates of Genetic Parameters for Female Fertility Traits from a Dairy Selection Experiment for Fat Plus Protein by Using Random Regression and Linear-threshold Animal Models written by Gustavo Augusto Gutierrez and published by . This book was released on 2010 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Commencement by : Iowa State University
Download or read book Commencement written by Iowa State University and published by . This book was released on 2010 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Linear Models for the Prediction of Animal Breeding Values by : R. A. Mrode
Download or read book Linear Models for the Prediction of Animal Breeding Values written by R. A. Mrode and published by Cab International. This book was released on 2014 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: The prediction of producing desirable traits in offspring such as increased growth rate or superior meat, milk and wool production is a vital economic tool to the animal scientist. Summarizing the latest developments in genomics relating to animal breeding values and design of breeding programs, this new edition includes models of survival analysis, social interaction and sire and dam models, as well as advancements in the use of SNPs in the computation of genomic breeding values.
Book Synopsis GENETIC PARAMETER ESTIMATES FOR FEMALE FERTILITY AND POST WEANING GROWTH AND EFFICIENCY TRAITS IN BEEF CATTLE. by : Yang Mu
Download or read book GENETIC PARAMETER ESTIMATES FOR FEMALE FERTILITY AND POST WEANING GROWTH AND EFFICIENCY TRAITS IN BEEF CATTLE. written by Yang Mu and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this thesis was to estimate genetic correlations between female fertility and feed efficiency measurements. Fertility data were collected from two Ontario beef herds and feed efficiency data were collected from one station with animals that originally came from five Ontario beef herds. Genetic parameters were estimated for female fertility traits (first-service conception rate, pregnancy rate, number of services per conception, gestation length and days-to-calving) and feed efficiency traits (feed conversion ratio, residual feed intake, average daily dry matter intake, average daily gain and metabolic mid-test body weight). Heritabilities for fertility traits were low to moderate and feed efficiency traits were moderate to highly heritable. Both traits need to be evaluated and considered in selection programs. Results indicate that animals with larger body weight are related to better fertility performance. An unfavourable correlation was found between residual feed intake and days-to-calving.
Book Synopsis Biostatistics for Animal Science, 3rd Edition by : Miroslav Kaps
Download or read book Biostatistics for Animal Science, 3rd Edition written by Miroslav Kaps and published by CABI. This book was released on 2017-06-23 with total page 563 pages. Available in PDF, EPUB and Kindle. Book excerpt: Designed to cover techniques for analysis of data in the animal sciences, this popular textbook provides an overview of the basic principles of statistics enabling the subsequent applications to be carried out with familiarity and understanding. Each chapter begins by introducing a problem with practical questions, followed by a brief theoretical background. Most topics are followed up with numerical examples to illustrate the methods described using data-sets from animal sciences and related fields. The same examples are then solved using the SAS software package. Written primarily for students and researchers in animal sciences, the text is also useful for those studying agricultural, biological, and veterinary sciences.
Book Synopsis Guidelines for Uniform Beef Improvement Programs by : Dixon D. Hubbard
Download or read book Guidelines for Uniform Beef Improvement Programs written by Dixon D. Hubbard and published by . This book was released on 1981 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Phenotypic and Genetic Variation of Milk Fat Components Incorporating Mid-Infrared Technology by : Allison Fleming
Download or read book Phenotypic and Genetic Variation of Milk Fat Components Incorporating Mid-Infrared Technology written by Allison Fleming and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Milk fat influences the economic, nutritional, flavour, and physico-chemical properties of milk and milk products. Genetic selection for fat components is therefore of interest. This would require an efficient means of phenotyping these traits routinely, on a large scale. The purpose of this study was to assess the ability to predict milk fat components using mid-infrared (MIR) spectroscopy and to examine the phenotypic and genetic variation of these traits. Individual cow milk samples from multiple breeds and herds were collected during routine milk recording multiple times throughout the lactation and the MIR spectra obtained. Milk samples were further analyzed for average milk fat globule (MFG) size and fatty acid profile using gold standard methodologies. Partial least squares regression models were employed to develop equations to predict the milk fat component traits from the MIR spectra of milk samples. Genetic parameters were estimated in Holsteins for both the measured and predicted MFG size and predicted fatty acids, along with their genetic correlations with milk production traits using multi-trait animal models. Milk fatty acid contents could be predicted with variable accuracy depending on the calibration set used and the concentration of the fatty acid in milk. In first-parity Holsteins, the predicted groups of fatty acids were found to have genetic correlations of similar magnitude with already recorded milk production traits. Differences in the genetic correlations with fat yield, fat and protein percentages, and fat to protein ratio were found for different fatty acid groups, including different trends in average daily genetic correlations at the beginning of lactation. Average MFG size was significantly affected by herd, breed, days in milk, season, and milking period. The prediction of MFG size from MIR spectra was poor, and predicted values had greater phenotypic correlations with fat percentage than their measured counterparts. A moderate heritability was found for average MFG size, but predicted values had very strong genetic correlations with fat percentage, limiting their utility. Mid-infrared technology provides an opportunity to obtain novel trait phenotypes, including fatty acids, for all milk recorded cows that could be used to help advance the Canadian dairy industry.
Book Synopsis Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc by : Institute of Medicine
Download or read book Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc written by Institute of Medicine and published by National Academies Press. This book was released on 2002-07-19 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is the newest release in the authoritative series issued by the National Academy of Sciences on dietary reference intakes (DRIs). This series provides recommended intakes, such as Recommended Dietary Allowances (RDAs), for use in planning nutritionally adequate diets for individuals based on age and gender. In addition, a new reference intake, the Tolerable Upper Intake Level (UL), has also been established to assist an individual in knowing how much is "too much" of a nutrient. Based on the Institute of Medicine's review of the scientific literature regarding dietary micronutrients, recommendations have been formulated regarding vitamins A and K, iron, iodine, chromium, copper, manganese, molybdenum, zinc, and other potentially beneficial trace elements such as boron to determine the roles, if any, they play in health. The book also: Reviews selected components of food that may influence the bioavailability of these compounds. Develops estimates of dietary intake of these compounds that are compatible with good nutrition throughout the life span and that may decrease risk of chronic disease where data indicate they play a role. Determines Tolerable Upper Intake levels for each nutrient reviewed where adequate scientific data are available in specific population subgroups. Identifies research needed to improve knowledge of the role of these micronutrients in human health. This book will be important to professionals in nutrition research and education.
Book Synopsis Livestock's Long Shadow by : Henning Steinfeld
Download or read book Livestock's Long Shadow written by Henning Steinfeld and published by Food & Agriculture Org.. This book was released on 2006 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The assessment builds on the work of the Livestock, Environment and Development (LEAD) Initiative"--Pref.
Book Synopsis Genetic evaluation using random regression models for longitudinal measurements of body weight in animals by : Špela Malovrh
Download or read book Genetic evaluation using random regression models for longitudinal measurements of body weight in animals written by Špela Malovrh and published by . This book was released on 2003 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Longitudinal measurements of body weight in 3,918 boars and 1,532 bulls from test station were analysed by random-regression models. Both species were housed in groups. Boars had 6 measurements during test, and bulls approximately 9. Covariance components for random-regression coefficients wereestimated by the REML method and the VCE5 software package. Orthogonal Legendre polynomials (LG) of different order were fit to random effects. Modelfor bulls included direct additive genetic and animal permanent environmental effects, while in boars common litter environment, common pen environment, and maternal genetic effect were fitted additionally. LG with four coefficients were found sufficient in both species. Animal permanent environment accounted for 35 to 40 % of phenotypic variabilitry in boars, and between 30 and 55 % in bulls. Estimates of direct heritability in bulls were in the range 0.22 to 0.45, inm boars were around 0.40. Maternal heritability in boars decreased from 0.03 to 0.01. The proportion of common litter effect decreased over time (0.24 to 0.15), too. The eigenfunctions and corresponding eigenvalues in both species showed that around 85 to 90 % of the total geneticvariability was explained by the constant term in regression, while 10 to 15 % was genetic variability in the shape of growth curve. In bulls, a combined random regression and conventional multi-trait model for body weight (BW) and five single measured carcass traits was studied. Estimated genetic correlation over time between BW and warm carcass weight, conformation index, and ratio muscle:bone increased with time from +0.02 to +0.80 (+0.60), between BW and ratio of valuable cuts was close to zero the entire time. Changing the shape of growth curve by selection is possible, but not easy. Using the results of the combined random-regression and multiple-trait analysis in selection could be an advantage for carcass traits.
Book Synopsis Using Science to Improve the BLM Wild Horse and Burro Program by : National Research Council
Download or read book Using Science to Improve the BLM Wild Horse and Burro Program written by National Research Council and published by National Academies Press. This book was released on 2013-10-04 with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using Science to Improve the BLM Wild Horse and Burro Program: A Way Forward reviews the science that underpins the Bureau of Land Management's oversight of free-ranging horses and burros on federal public lands in the western United States, concluding that constructive changes could be implemented. The Wild Horse and Burro Program has not used scientifically rigorous methods to estimate the population sizes of horses and burros, to model the effects of management actions on the animals, or to assess the availability and use of forage on rangelands. Evidence suggests that horse populations are growing by 15 to 20 percent each year, a level that is unsustainable for maintaining healthy horse populations as well as healthy ecosystems. Promising fertility-control methods are available to help limit this population growth, however. In addition, science-based methods exist for improving population estimates, predicting the effects of management practices in order to maintain genetically diverse, healthy populations, and estimating the productivity of rangelands. Greater transparency in how science-based methods are used to inform management decisions may help increase public confidence in the Wild Horse and Burro Program.
Book Synopsis Phenotypic Characterization of Animal Genetic Resources by :
Download or read book Phenotypic Characterization of Animal Genetic Resources written by and published by Food & Agriculture Organization of the UN (FAO). This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: These guidelines are part of a series of publications produced by FAO to support countries in the implementation of the Global Plan of Action for Animal Genetic Resources.
Book Synopsis Diet and Health by : National Research Council
Download or read book Diet and Health written by National Research Council and published by National Academies Press. This book was released on 1989-01-01 with total page 765 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diet and Health examines the many complex issues concerning diet and its role in increasing or decreasing the risk of chronic disease. It proposes dietary recommendations for reducing the risk of the major diseases and causes of death today: atherosclerotic cardiovascular diseases (including heart attack and stroke), cancer, high blood pressure, obesity, osteoporosis, diabetes mellitus, liver disease, and dental caries.
Author :Food and Agriculture Organization of the United Nations Publisher :Food & Agriculture Org. ISBN 13 :9251305722 Total Pages :278 pages Book Rating :4.2/5 (513 download)
Book Synopsis The State of Food Security and Nutrition in the World 2018 by : Food and Agriculture Organization of the United Nations
Download or read book The State of Food Security and Nutrition in the World 2018 written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 2018-09-14 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: New evidence this year corroborates the rise in world hunger observed in this report last year, sending a warning that more action is needed if we aspire to end world hunger and malnutrition in all its forms by 2030. Updated estimates show the number of people who suffer from hunger has been growing over the past three years, returning to prevailing levels from almost a decade ago. Although progress continues to be made in reducing child stunting, over 22 percent of children under five years of age are still affected. Other forms of malnutrition are also growing: adult obesity continues to increase in countries irrespective of their income levels, and many countries are coping with multiple forms of malnutrition at the same time – overweight and obesity, as well as anaemia in women, and child stunting and wasting.
Book Synopsis Organic Dairy Production by : Sarah Flack
Download or read book Organic Dairy Production written by Sarah Flack and published by Chelsea Green Publishing. This book was released on 2011-04-28 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is no simple recipe for setting up and managing a successful organic dairy farm, but this handbook can act as an introduction to important issues in organic dairy production and provide today's organic or transitioning dairy farmer with an overview of the tools and ideas available. Part of the NOFA guides. Organic Dairy Production includes information on: Soils, the foundation of health (manure management) Crop production and grazing management (forage species, pasture management, setting up a grazing system) Livestock (selection, nutrition, winter and summer feed considerations, seasonal milking, habitat, herd health, milk quality) Marketing (selling fluid milk, regulations, facility and equipment, selling raw milk) Recordkeeping The transition to organic Features examples from various farms in the Northeast.
Book Synopsis Selective Breeding in Aquaculture: an Introduction by : Trygve Gjedrem
Download or read book Selective Breeding in Aquaculture: an Introduction written by Trygve Gjedrem and published by Springer Science & Business Media. This book was released on 2010-03-17 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: The foundation of quantitative genetics theory was developed during the last century and facilitated many successful breeding programs for cultivated plants and t- restrial livestock. The results have been almost universally impressive, and today nearly all agricultural production utilises genetically improved seed and animals. The aquaculture industry can learn a great deal from these experiences, because the basic theory behind selective breeding is the same for all species. The ?rst published selection experiments in aquaculture started in 1920 s to improve disease resistance in ?sh, but it was not before the 1970 s that the ?rst family based breeding program was initiated for Atlantic salmon in Norway by AKVAFORSK. Unfortunately, the subsequent implementation of selective breeding on a wider scale in aquaculture has been slow, and despite the dramatic gains that have been demonstrated in a number of species, less than 10% of world aquaculture production is currently based on improved stocks. For the long-term sustainability of aquaculture production, there is an urgent need to develop and implement e- cient breeding programs for all species under commercial production. The ability for aquaculture to successfully meet the demands of an ever increasing human p- ulation, will rely on genetically improved stocks that utilise feed, water and land resources in an ef?cient way. Technological advances like genome sequences of aquaculture species, and advanced molecular methods means that there are new and exciting prospects for building on these well-established methods into the future.
Book Synopsis Mitigation of Greenhouse Gas Emissions in Livestock Production by : Pierre J. Gerber
Download or read book Mitigation of Greenhouse Gas Emissions in Livestock Production written by Pierre J. Gerber and published by Food & Agriculture Organization of the UN (FAO). This book was released on 2013 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current analysis was conducted to evaluate the potential of nutritional, manure and animal husbandry practices for mitigating methane (CH4) and nitrous oxide (N2O) - i.e. non-carbon dioxide (CO2) - GHG emissions from livestock production. These practices were categorized into enteric CH4, manure management and animal husbandry mitigation practices. Emphasis was placed on enteric CH4 mitigation practices for ruminant animals (only in vivo studies were considered) and manure mitigation practices for both ruminant and monogastric species. Over 900 references were reviewed; simulation and life cycle assessment analyses were generally excluded
