Author: Richard M. Meek
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Thomas H Spreen
Publisher: CRC Press
ISBN: 1000239616
Category : Science
Languages : en
Pages : 269

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Book Description
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: N. de Ridder
Publisher: ILRI (aka ILCA and ILRAD)
ISBN:
Category :
Languages : en
Pages : 366

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ILCA's policy towards modelling in the framework of livestock systems research; models and the analysis of productivity in extensive livestock systems in Israel; prediction of actual primary production under nitrogen limitation; behavioural aspects of intake at pasture in ruminats; prediction of feed intake in ruminats; relationships between chemical composition and voluntary intake of feeds by sheep and cattle; the effect of breeding season duration on production and feed consumption in grazing beef cattle in the south of Israel; adaptation of the Kahan model for a mixed farming system in southeastern Asia; appraisal of the ILCA cattle herd dynamics model using data from pastoral systems in mali and kenya; moddeling pastoral livestock production: problems and prospect; analysis of management impact in semi-arid agropastoral systems; modelling economic outcomes of livestock production systems; selection of sheep husbandy techologies under single and multiple goal constraints; types, purposes and users of models; problems related do intake.

Author:
Publisher: ILRI (aka ILCA and ILRAD)
ISBN:
Category :
Languages : en
Pages : 114

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Author: Thomas H Spreen
Publisher: CRC Press
ISBN: 100031149X
Category : Science
Languages : en
Pages : 283

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Book Description
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: United States. General Accounting Office
Publisher:
ISBN:
Category : Beef
Languages : en
Pages : 172

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Author:
Publisher:
ISBN: 9780642941817
Category : Beef cattle
Languages : en
Pages : 80

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Author: Stephen Emil Clarke
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 152

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Book Description
A mathematical model was developed to simulate alternative selection and crossbreeding strategies for commercial beef production. Biological and economic constraints were selected to represent typical pasture production of calves in the Northwest. The crossbreeding study evaluated the relative economic efficiency of different 1) mating plans when sire breeds of several sizes were used, 2) maximum cow replacement ages, and 3) cow culling strategies based on measures of reproductive failure. Replacing open cows in the fall with a heifer increased economic efficiency, as did replacing cows without a live calf at the end of the calving season. Replacing cows for failure to wean a calf decreased economic efficiency. The use of a very large terminal breed in the criss-out-cross or the three-breed terminal cross surpassed the three-breed rotational cross in economic efficiency. The criss-out-cross was superior to the three-breed terminal cross at cow replacement ages less than twelve years. The cow replacement ages which maximized gross margin per cow were five, nine, and twelve years for three-breed rotational, criss-out-cross and three-breed terminal crossbreeding, respectively. This reflected the average utilization of individual and maternal heterosis for the various mating plans. The selection study evaluated the economic efficiency and selection response of alternative bull and cow culling strategies. Selection was practiced for forty years to increase weaning weight while holding birth weight constant. The bull use strategy which maximized selection gains was to keep bulls for four years while culling 75% of the two-year old bulls based on a progeny test. Economic efficiency was maximized by keeping bulls for only one year. Culling cows for being open or for not having a live calf at the end of the calving season improved economic efficiency to a greater degree than did changing the maximum cow replacement age or the proportion of cows culled based on progeny performance, both of which also improved economic efficiency. Weaning weight was increased either by decreasing the maximum cow replacement age or by increasing the proportion of cows culled for poor progeny performance, but not both, simultaneously.

Author:
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 132

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Author: Henry C. Gilliam
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 72

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Extract: The number of beef cows in each of the four major U.S. cow-calf production regions declined by about one-fifth between 1975 and 1980 in response to sharp reductions in feeder cattle prices and increases in production costs during the midseventies. Several physical measures of performance indicate that most resources were used more efficiently in beef cow-calf production in 1980 than in 1975. This report identifies the structural characteristics and operating practices for beef cow-calf production operations in the United States.