Simulation study of flock dynamics: application to intensive production system of Egyptian Barki sheep
Alsheikh, S. M.
Simulation study of flock dynamics: application to intensive production system of Egyptian Barki sheep [electronic resource]. دراسة محاكاة لديناميكية القطيع: تطبيقا لنظام الإنتاج المكثف فى لأغنام البرقي المصرية. - p.8151-8160.
Includes reference.
A dynamic flock simulator model (DFM) is presented. This model studies the complexity reproduction management systems of three lambings in two years system. Two types of data were used to, build the simulator IT1O!Iel.Ewe data (concerned 13725 records for 3120 BarkiewesfmlT('W70 to 2000)1I'om:Barki flock management database of the Maryuot Research Station. Desert Research Center. Ministry of Agricu~ure, Egypt. References. on three lambing in two years management practices. were implemented by researcher to ensure the generality of the model structure. The simulator model was based on some'set of specifications. The flock was divided into two batches. Data were analyzed to estimate the biological responses that are necessary for selling the model parameters. Also, input/output data were economicly analyzed at each phase corresponded to the characterization of the each batch flock, which is the set of all the ewes used for reproduction, replaced system. The result shows that, The batch production cycle (BPC) was the basic management entity for the dynamic flock model (DFM) structure. The relation between biological responses and ewe productive trajectory'was the bas,ic unit of the studied DFM performance and evolution. The average gross ou1put oflambs, wool, manure and culling animals per production cycle was 150450 LE, 1581 LE, 12635 LE and 53813 LE, respectively. This resu~ shows that lambs, wool, manure and culling animals contributed 69%,1%, 6% and 24% of total gross ou1put, respecttvely. It could be concluded that, this is a very simple DFM and clearly could be much improved nmore detailed information on the inputs relating to reproductive a!l~productive performances were available. ConsequenUy,the model could be exp8cted to produce very dffferent outputs for different mating seasons over a range ,of environments. In this model, a mating program was used with a ewe batch being joined at regUlar 4-monthly intervals. However, modification of the system to permit shorter or longer intervals between matings may be warranted and the model is capable of indicating the effect on output of such changes. Also, the DFM is promising economic rewording.
Summary in Arabic.
Sheep--Research.
Computer simulation.
Simulation study of flock dynamics: application to intensive production system of Egyptian Barki sheep [electronic resource]. دراسة محاكاة لديناميكية القطيع: تطبيقا لنظام الإنتاج المكثف فى لأغنام البرقي المصرية. - p.8151-8160.
Includes reference.
A dynamic flock simulator model (DFM) is presented. This model studies the complexity reproduction management systems of three lambings in two years system. Two types of data were used to, build the simulator IT1O!Iel.Ewe data (concerned 13725 records for 3120 BarkiewesfmlT('W70 to 2000)1I'om:Barki flock management database of the Maryuot Research Station. Desert Research Center. Ministry of Agricu~ure, Egypt. References. on three lambing in two years management practices. were implemented by researcher to ensure the generality of the model structure. The simulator model was based on some'set of specifications. The flock was divided into two batches. Data were analyzed to estimate the biological responses that are necessary for selling the model parameters. Also, input/output data were economicly analyzed at each phase corresponded to the characterization of the each batch flock, which is the set of all the ewes used for reproduction, replaced system. The result shows that, The batch production cycle (BPC) was the basic management entity for the dynamic flock model (DFM) structure. The relation between biological responses and ewe productive trajectory'was the bas,ic unit of the studied DFM performance and evolution. The average gross ou1put oflambs, wool, manure and culling animals per production cycle was 150450 LE, 1581 LE, 12635 LE and 53813 LE, respectively. This resu~ shows that lambs, wool, manure and culling animals contributed 69%,1%, 6% and 24% of total gross ou1put, respecttvely. It could be concluded that, this is a very simple DFM and clearly could be much improved nmore detailed information on the inputs relating to reproductive a!l~productive performances were available. ConsequenUy,the model could be exp8cted to produce very dffferent outputs for different mating seasons over a range ,of environments. In this model, a mating program was used with a ewe batch being joined at regUlar 4-monthly intervals. However, modification of the system to permit shorter or longer intervals between matings may be warranted and the model is capable of indicating the effect on output of such changes. Also, the DFM is promising economic rewording.
Summary in Arabic.
Sheep--Research.
Computer simulation.