Download or read book Optimum Dairy Cow Replacement Policies to Maximize Income Over Feed Cost written by Richard Walker Rundell and published by . This book was released on 1967 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: Simulation of a dairy herd over a period of 15 years was used to examine replacement strategies among six operationally practical systems of culling cows which whould maximize income over feed costs. The strategies or criteria used to remove the lower ranking cows to a relatively constant herd size were: (1) Mature Equivalent (M.E.) milk production, (2) M.E. gross milk income, (3) actual milk production, (4) actual gross income, (5) income over feed cost, and (6) present value of expected gross income of cow and her subsequent replacements. Two each of prices of milk, fat differential, feed, and operational costs totaled 2 4 x 6 x 2 replications per trial or 192 replications. The following were treated as stochastic variables: (a) variation in milk production and milkfat percentage between cows and between lactations of the same cow, (b) chance of a calf being a heifer or bull, (c) chance of involuntary death or removal of cows and youngstock, and (d) chance of month of the year of involuntary removals. The mean and variance of the base herd approximated the average Michigan DHIA Holstein population in 1966. The sire value, approximating the best bulls used in A.I. was identical for any given year through all strategies and replications, but improved over time at the rate of 130 1b milk per year. Culls or cows removed because of low in each respective strategy were removed at the most profitable point to cull in their respective lactations by equating the milk income of the marginal month with the sun of the month's feed costs and monthly operational charges. Practical use of this simple method of determining when to cull cows within a lactation was demonstrated. A complete factorial design to analyze the generates data showed no significant differences between strategies under alternative combinations of prices in average income including salvage over feed cost per cow discounted to the present. This income was affected by the level of milk price (P
Download or read book Optimal Dairy Cow Replacement Policies written by H. B. Giaever and published by . This book was released on 1991 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optimal Dairy Cow Replacement Policies written by Harald Birger Giaever and published by . This book was released on 1974 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development and Comparison of Selection Criteria for Cows and Bulls with a Dairy Herd Simulation Model written by Abele Kuipers and published by . This book was released on 1980 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Large Dairy Herd Management written by H. H. Van Horn and published by American Dairy Science Association. This book was released on 1992 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Animal Health Economics written by Aalt A. Dijkhuizen and published by Purdue University Press. This book was released on 1997 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: A guide to the field of animal health economics and its underlying methodology. Supplied with this book is a diskette, containing practical exercises (in computer spreedsheets) on the various methods and techniques in animal health economics, including production function analysis.
Download or read book Calf and Heifer Rearing written by Philip C. Garnsworthy and published by Nottingham Trent University. This book was released on 2005-01-01 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume considers every aspect of calf rearing, from physiological principles to practical systems. Topics include physiology of growth and digestion, nutrient requirements, health and welfare, and lifetime performance. More than half the authors are from outside the UK and all are acknowledged as international experts in their field. This book is aimed at technical advisers, researchers, extension workers, veterinary practitioners, progressive farmers, academics and students.
Download or read book Air Emissions from Animal Feeding Operations written by National Research Council and published by National Academies Press. This book was released on 2003-04-07 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Air Emissions from Animal Feeding Operations: Current Knowledge, Future Needs discusses the need for the U.S. Environmental Protection Agency to implement a new method for estimating the amount of ammonia, nitrous oxide, methane, and other pollutants emitted from livestock and poultry farms, and for determining how these emissions are dispersed in the atmosphere. The committee calls for the EPA and the U.S. Department of Agriculture to establish a joint council to coordinate and oversee short - and long-term research to estimate emissions from animal feeding operations accurately and to develop mitigation strategies. Their recommendation was for the joint council to focus its efforts first on those pollutants that pose the greatest risk to the environment and public health.
Download or read book Grassland Productivity and Ecosystem Services written by Gilles Lemaire and published by CABI. This book was released on 2011 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains 28 chapters with emphasis on the interactive nature of the relationships between the soil, plant, animal and environmental components of grassland systems, both natural and managed. It analyses the present knowledge and the future trends of research for combining the classical view of grasslands, as a resource for secure feeding of an increasing human population, with the more recent perspective of the contribution of grasslands to the mitigation of environmental impacts and biodiversity erosion as consequences of human society activities. The chapters are organized within five sections dealing with the different functions and the main ecosystem services expected from grasslands: (i) domestic herbivore feeding and animal production; (ii) the regulation of biogeochemical cycles and its consequences for the environment; (iii) dynamics of biodiversity hosted by grasslands; (iv) integration of grasslands within sustainable animal production systems; and (v) interactions of grassland areas with other land use systems at the landscape level.
Download or read book U S Dairy Industry at a Crossroad Biotechnology and Policy Choices written by and published by . This book was released on 1991 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Southern Journal of Agricultural Economics written by and published by . This book was released on 1973 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Rearing Rate on Different Measures of Productivity of the Farm Business written by Randy Lee Knapp and published by . This book was released on 1976 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S dairy industry at a crossroad biotechnology and policy choices written by CONGRESS OF THE UNITED STATES - OFFICE OF TECHNOLOGY ASSESSMENT and published by DIANE Publishing. This book was released on 1991 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Dairy Enterprise Expansion Alternatives written by Gary G. Grank and published by . This book was released on 1974 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selection of Dairy Cattle for Overall Excellence written by DeVon Franklin Andrus and published by . This book was released on 1972 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Farm Planning and Control written by C. S. Barnard and published by Cambridge University Press. This book was released on 1979 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive treatment of farm business and control, with many examples drawn from farming practice.
Download or read book National Agricultural Library Catalog 1966 1970 Names written by National Agricultural Library (U.S.) and published by . This book was released on 1973 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
