Farm management practices associated with macrocyclic lactone resistance on sheep farms in New Zealand

2006 ◽  
Vol 54 (6) ◽  
pp. 283-288 ◽  
Author(s):  
KE Lawrence ◽  
AP Rhodes ◽  
R Jackson ◽  
DM Leathwick ◽  
C Heuer ◽  
...  
Keyword(s):  
New Zealand ◽  
Macrocyclic Lactone ◽  
Management Practices ◽  
Farm Management ◽  
Macrocyclic Lactone Resistance

FARM MANAGEMENT PRACTICES AS AN AID TO PASTURE IMPROVEMENT ON STEEP GREYWACKE HILL COUNTRY

1961 ◽  
pp. 45-54
Author(s):  
I.D. Currie
Keyword(s):  
New Zealand ◽  
Management Practices ◽  
Farm Management ◽  
Natural Fertility ◽  
Hill Country ◽  
Property Owner ◽  
Second Growth ◽  
Real Challenge ◽  
Soil Groups

The Soil Bureau tells me that there are at least eight million acres of greywacke derived soils in New Zealand. The greywacke clay hills form one of the oldest and largest soil groups in the country. In the Raglan County alone they account for about 91,000 acres or a sixth of the county area. As an Advisory Officer appointed in that district I soon became acquainted with the typical thin, dark grey topsoil formed over a weathered, sticky yellow subsoil. Well watered, but hard baked in summer, greasy in winter, these hills, with their characteristics of steepness, low natural fertility, and steady reversion to second growth, had proved the most difficult class of land to handle, and as such they offered a real challenge to the property owner and to myself as the new adviser.

scholarly journals PROBLEMS OF SCRUB CONTROL

1962 ◽  
pp. 73-83
Author(s):  
W.F. Leonard
Keyword(s):  
New Zealand ◽  
Management Practices ◽  
Farm Management ◽  
The South ◽  
Control Climate

This paper describes the distribution of the main scrub weeds in the South Island of New Zealand and offers comments on their control. Climate, soils, and farm management practices set the pattern for the distribution and importance of scrub weeds. Wide variation in all three can be found in the South Island.

scholarly journals Understanding effects of multiple farm management practices on barley performance

2017 ◽  
Vol 90 ◽  
pp. 43-52 ◽  
Author(s):  
Libère Nkurunziza ◽  
Iman Raj Chongtham ◽  
Christine A. Watson ◽  
Håkan Marstorp ◽  
Ingrid Öborn ◽  
...  
Keyword(s):  
Management Practices ◽  
Farm Management

Can farm-management practices reduce the impact of house mouse populations on crops in an irrigated farming system?

2004 ◽  
Vol 31 (6) ◽  
pp. 597 ◽  
Author(s):  
Peter R. Brown ◽  
Micah J. Davies ◽  
Grant R. Singleton ◽  
J. David Croft
Keyword(s):  
House Mouse ◽  
Management Practices ◽  
Farming System ◽  
Farm Management ◽  
Advisory Panel ◽  
Farming Practices ◽  
Management Actions ◽  
Winter Cereals ◽  
Significant Difference ◽  
The Impact

The impacts of a range of farm-management practices on house mouse (Mus domesticus) populations were tested in a large replicated field study in a complex irrigated farming system in southern New South Wales, Australia. An advisory panel, made up of farmers, extension officers, industry representatives and scientists developed a series of best-practice farm-management actions to minimise the impact of mice. Twelve experimental sites were split into six treated sites, where farmers were encouraged to conduct the recommended practices, and six untreated sites, where farmers conducted their normal farming practices. Mouse abundance was generally low to moderate for the 4-year project (5–60% adjusted trap success). We found significant reductions in population abundance of mice on treated sites when densities were moderate, but no differences when densities were low. Biomass of weeds and grasses around the perimeter of crops were significantly lower on treated sites because of applications of herbicide sprays and grazing by sheep. We could not detect any significant difference in mouse damage to crops between treated and untreated sites; however, levels of damage were low (<5%). Yields of winter cereals and rice crops were significantly higher on treated sites by up to 40%. An analysis of benefits and costs of conducting farming practices on treated sites compared with untreated sites showed a 2 : 1 benefit to cost ratio for winter cereals, 9 : 1 for rice and 4 : 1 for soybeans.

Nematode ligand-gated chloride channels: an appraisal of their involvement in macrocyclic lactone resistance and prospects for developing molecular markers

Parasitology ◽  
2007 ◽  
Vol 134 (8) ◽  
pp. 1111-1121 ◽  
Author(s):  
S. McCAVERA ◽  
T. K. WALSH ◽  
A. J. WOLSTENHOLME
Keyword(s):  
Haemonchus Contortus ◽  
Chloride Channels ◽  
Macrocyclic Lactone ◽  
Parasitic Nematodes ◽  
C Elegans ◽  
Molecular Tests ◽  
Cooperia Oncophora ◽  
Macrocyclic Lactone Resistance ◽  
High Level ◽  
Laboratory Models

SUMMARYLigand-gated chloride channels, including the glutamate-(GluCl) and GABA-gated channels, are the targets of the macrocyclic lactone (ML) family of anthelmintics. Changes in the sequence and expression of these channels can cause resistance to the ML in laboratory models, such as Caenorhabditis elegans and Drosophila melanogaster. Mutations in multiple GluCl subunit genes are required for high-level ML resistance in C. elegans, and this can be influenced by additional mutations in gap junction and amphid genes. Parasitic nematodes have a different complement of channel subunit genes from C. elegans, but a few genes, including avr-14, are widely present. A polymorphism in an avr-14 orthologue, which makes the subunit less sensitive to ivermectin and glutamate, has been identified in Cooperia oncophora, and polymorphisms in several subunits have been reported from resistant isolates of Haemonchus contortus. This has led to suggestions that ML resistance may be polygenic. Possible reasons for this, and its consequences for the development of molecular tests for resistance, are explored.

Sign in / Sign up

Export Citation Format

Share Document