Simulation of the Cattle-calves Sub-sector in a Developed Economy with Special Reference to the Canadian Cattle Herd PDF Download
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Author: John James Meek
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages : 844
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Author: John James Meek
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages : 844
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Author: Thomas H Spreen
Publisher: CRC Press
ISBN: 100031149X
Category : Science
Languages : en
Pages : 283
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Economic analysis of beef cattle production has been limited by the inability to fully describe the underlying production process. Except for confined feeding of cattle, beef cattle production is the process of growing cattle who consume forages. The animal and the forage possess attributes of both factors and products of production. The production of forage constitutes one production process, animal growth is another production process, and reproduction by female animals is a third production process. Cattle production involves all three processes in such a manner that each influences the outcome of the other. Each process is itself complex and analysis is further complicated when all three are considered simultaneously.
Author: Richard J. Crom
Publisher:
ISBN:
Category : Meat industry and trade
Languages : en
Pages : 20
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Author: Thomas Lee Nordblom
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 556
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This study expresses the hypothesis that historical patterns of national beef cow herd accumulation and liquidations (the cattle cycle) have been related to investment incentive differences across cow ages through time, resulting each year in changes in herd age structure, performance and potentials for adjustment in subsequent years. A review of national cattle cycle literature reveals the common assumption of variable heifer recruitment levels through time to the mature cow herd. A review of firm level cattle cycle stategy studies shows that most which considered heterogeneous herds (distinguishing performance by cow age) ironically assumed constant recruitment in proportion to cow numbers. Farmer interviews indicated that heifer recruitment may vary widely in proportion to cow numbers from year to year and that there are strong tendencies to cull non-pregnant and unsound cows from the herd at any age. The present study assumes both variable recruitment and age heterogenity. A search and synthesis of the biological literature allowed expression of economically important attributes as point estimates from continuous functions of cow age. These attributes are conception rates, health rates, cow survival rates, cull cow body weights, calf survival rates and weaning weights. Based on these biological parameters, and on the assumption that non-pregnant and unsound cows would be culled, retainment and culling rates are defined as management expectation parameters. These biological and expectation parameters are the building blocks of a simulation model designed to make value comparisons between cows of different ages and pregnancy status and to trace out changes in the national cow herd age structure through time. A budget generator produces estimates of expected net annual revenues for each of the 26 discrete age and pregnancy classes of heifers and cows, in each year from 1950 through 1978, based on exogenous price and cost series. These estimates are used to project the present values of expected future net revenues for each class of breeding animals. The ratio of future breeding value to present cull slaughter value is calculated for each of the 26 classes, each year. These V-ratios, in turn, are decision variables for determining the proportions of animals in each class to be retained in the herd, simulated by a national beef cow demography model. Annual summations from the demography model are compared with objective historical series of January 1 inventories of beef cows and replacement heifers, and annual numbers of cull cows slaughtered and beef calves born. The model's simplicity, ignoring related livestock sectors, is one of its significant features. With its few exogenous price and cost variables, simple biological relationships and management assumptions, the model is able to track the historical numbers of beef cows and calves born quite well. Mean proportional absolute deviations (MPAD) of the simulated series from the objective historical series were computed in addition to simple correlation coefficients and Theil's coefficients of inequality. In a display run, the tracking behavior of the model was best for cow inventories and calves born, and worst for heifer recruitment and cull cows, with MPAD's of .029, .036, .172, and .261, respectively. Theil's coefficients of inequality were .405, .587, .962, and .842, respectively. In an alternative run, with parameters set to reflect the assumption that all cows have the same performance characteristics across ages, the tracking behavior of the model was in several aspects about as good as the display run. Thus, the null hypothesis that performance differences across cow ages are of no importance in explaining investment behavior could not be rejected. Simulated national beef cow herd age structure changes through cattle cycles are shown from 1950 through 1978.
Author: Dennis William Pervis
Publisher:
ISBN:
Category : Fertilizer industry
Languages : en
Pages : 478
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Author: Richard C. Porter
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages : 54
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Author: A. Kuipers
Publisher: Center Agricultural Pub & Document
ISBN: 9789022008133
Category : Cattle
Languages : en
Pages : 196
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Book Description
Selection criteria for cow culling. Application of replacement theory to cow culling. Development of an economic index. Selection criteria for choosing bulls. Thechnique used to study decision problems. Choice among milk traits to include in decision criteria. Dairy herd simulation model. Comparison of cow culling criteria with the dairy herd. Comparison of criteria for choosing bulls with the dairy herd simulation model.
Author: Jesse John Dossick
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN:
Category : Education
Languages : en
Pages : 588
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 1146
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Author:
Publisher:
ISBN:
Category : Canada
Languages : en
Pages : 572
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