Graphic Method Showing Efficiency of Dairy Bulls
نویسندگان
چکیده
منابع مشابه
Examination of more frequent genetic evaluations for dairy bulls.
Genetic evaluations of Holstein bulls for February 1997 through May 1998 were examined to determine the value of more frequent evaluation for quicker identification of bulls with changing predicted transmitting abilities (PTA) and of new bulls of superior genetic merit. Changes in PTA between evaluations that were calculated quarterly rather than semiannually were reduced by 30%. About two-thir...
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A stochastic cost equation was estimated for US dairy farms using national data from the production year 2000 to determine how farmers might reduce their cost of production. Cost of producing a unit of milk was estimated into separate frontier (efficient) and inefficiency components, with both components estimated as a function of management and causation variables. Variables were entered as im...
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HE genetics of farm mammals have not been investigated in a manner T comparable to the intensive studies made, during the last forty years, with Drosophila, laboratory rodents, and chickens. Nevertheless, a large number of mutant genes have been reported in farm mammals. These mutants have been discovered more or less by chance when sufficient inbreeding has brought them to light. Many more hav...
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The breeding soundness evaluation (BSE) is a practical method to identify bulls with less than satis factory breeding potential. This evalu ation should be conducted on every bull at least 30 to 60 days before each breeding season to allow enough time for replacement of deferred or unsatis factory bulls. The first step in a BSE is to select a veterinarian in your area who is competent in con...
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data envelopment analysis (dea) is a powerful tool for measuring relative efficiency of organizational units referred to as decision making units (dmus). in most cases dmus have network structures with internal linking activities. traditional dea models, however, consider dmus as black boxes with no regard to their linking activities and therefore do not provide decision makers with the reasons...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1942
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(42)95366-9