|
|
|
|
|
| REGO,MARCELO A.S.; SABBAG,OMAR J.; SOARES,ROBERTA B.; PEIXOTO,SILVIO. |
| Abstract Shrimp farming has a great ecological, economic, and social importance in northeastern Brazil. Although the conventional farming system is widely used, biofloc technology (BFT) system has been developed to reduce environmental impacts and optimizing the production. Thus,the present study evaluated the technical efficiency of production cycles of Litopenaeus vannamei in conventional and BFT systems.We analyzed 48 production cycles in the conventional system in 2013 and 2014 and 9 cycles in the BFT system in 2014 through data envelopment analysis (DEA). The inputs corresponded to the population density (post-larvae m-2), amount of feed (kg ha-1 cycle-1), labor (man ha-1) and power supply (HP ha-1), whereas the yield (kg ha-1 cycle-1) was considered... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Data envelopment analysis; Inefficiency; Productive systems; Shrimp farming. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703705 |
| |
|
| |
|
| |
|
|
| Hennessy, David A.. |
| Infectious livestock disease creates externalities for proximate animal production enterprises. The distribution of production scale within a region should influence and be influenced by these disease externalities. Taking the distribution of the unit costs of stocking an animal as primitive, we show that an increase in the variance of these unit costs reduces consumer surplus. The effect on producer surplus, total surplus, and animal concentration across feedlots depends on the demand elasticity. A subsidy to smaller herds can reduce social welfare and immiserize the farm sector by increasing the extent of disease. While Nash behavior involves excessive stocking, disease effects can be such that aggregate output declines relative to first-best. Disease... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Agricultural industrialization; Biosecurity; Inefficiency; Nash behavior; Overinvestment; Technology adoption; Livestock Production/Industries. |
| Ano: 2006 |
URL: http://purl.umn.edu/18623 |
| |
|
| |
|
|
|
