Author: Blair Joseph SmithPublisher:
ISBN:
Category :
Languages : en
Pages : 474
Book Description
The Dairy Cow Replacement Problem and the Determination of Optimal Replacement Policies
Author: Blair Joseph SmithOptimal Dairy Cow Replacement Policies
Author: Harald Birger GiaeverPublisher:
ISBN:
Category : Dairy cattle
Languages : en
Pages : 732
Book Description
Optimal Dairy Cow Replacement Policies
Author: H. B. GiaeverOptimum Dairy Cow Replacement Policies to Maximize Income Over Feed Cost
Author: Richard Walker RundellPublisher:
ISBN:
Category : Dairy cattle
Languages : en
Pages : 246
Book Description
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
Dynamic Programming
Author: John O.S. KennedyPublisher: Springer Science & Business Media
ISBN: 9400941919
Category : Science
Languages : en
Pages : 343
Book Description
Humans interact with and are part of the mysterious processes of nature. Inevitably they have to discover how to manage the environment for their long-term survival and benefit. To do this successfully means learning something about the dynamics of natural processes, and then using the knowledge to work with the forces of nature for some desired outcome. These are intriguing and challenging tasks. This book describes a technique which has much to offer in attempting to achieve the latter task. A knowledge of dynamic programming is useful for anyone interested in the optimal management of agricultural and natural resources for two reasons. First, resource management problems are often problems of dynamic optimization. The dynamic programming approach offers insights into the economics of dynamic optimization which can be explained much more simply than can other approaches. Conditions for the optimal management of a resource can be derived using the logic of dynamic programming, taking as a starting point the usual economic definition of the value of a resource which is optimally managed through time. This is set out in Chapter I for a general resource problem with the minimum of mathematics. The results are related to the discrete maximum principle of control theory. In subsequent chapters dynamic programming arguments are used to derive optimality conditions for particular resources.
Project Report
Author: The Replacement Problem
Author: Thomas F. CooleyPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
We construct a vintage capital model of economic growth in which the decision to replace old technologies with new ones is modeled explicitly. Depreciation in this environment is an economic, not a physical concept. We describe the balanced growth paths and the transitional dynamics of this economy. We illustrate the importance of vintage capital by analyzing the response of the economy to fiscal policies designed to stimulate investment in new technologies. A revised version of this paper is published in the Journal of Monetary Economics, v. 40, no. 3(December 1997):457-499.
A Linear Programming Analysis of the Dairy Herd Replacement Problem on Selected Ohio Dairy Farms
Author: Donald Orin McAllisterPublisher:
ISBN:
Category : Dairy cattle
Languages : en
Pages :
Book Description
Bulletin - University of Florida, Agricultural Experiment Stations
Author: University of Florida. Agricultural Experiment StationPublisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 1094
Book Description
A Multi-stage Stochastic Decision Model for Determining Optimal Replacement of Dairy Cows
Author: Keith Bunker JenkinsPublisher:
ISBN:
Category : Dairy cattle
Languages : en
Pages : 146
Book Description