[1]
|
Steinfeld, H., Gerber, P., Wassenaar, T., Castel, V., Rosales, M. and de Haan, C. (2006) Livestock’s long shadow: Environmental issues and options. FAO, Rome, 390.
|
[2]
|
Pitesky, M.E., Stackhouse, K.R. and Mitloehner, F.M. (2009) Clearing the air: Livestock’s contribution to climate change. Advances in Agronomy, 103, 1-40.
doi:10.1016/S0065-2113(09)03001-6
|
[3]
|
Meissner, H.H., Scholtz, M.M. and Schonfeldt, H.C. (2012) The status, socio-economic and environmental impact, and challenges of livestock agriculture in South Africa. www.rmrdsa.co.za
|
[4]
|
IPCC (2007) Climate change 2007: Synthesis report. Contribution of working groups I, II and III to the fourth assessment report of the Intergovernmental Panel on Climate Change. IPCC, Geneva.
|
[5]
|
Clark, H., Klein, C. and Newton, P. (2001) Potential management practices and technologies to reduce nitrous oxide, methane and carbon dioxide emissions from New Zealand agriculture. Ngaherehere: Ministry of Agriculture and Forestry.
http://www.maf.govt.nz/mafnet/rural-nz/sustainable-resource-use/climate/green-house-gas-migration/ghg-mitigation.htm
|
[6]
|
Garnett, T. (2010) Intensive versus extensive livestock systems and greenhouse gas emissions. Food Climate Research Network Briefing Paper.
http://www.fcrn.org.uk/sites/default/files/FCRN_int_vs_ext_livestock.pdf
|
[7]
|
Capper, J.L. (2011) Replacing rose-tinted spectacles with a high-powered microscope: The historical versus modern carbon footprint of animal agriculture. Animal Frontiers 1, 26-32. doi:10.2527/af.2011-0009
|
[8]
|
Rmrd, S.A. (2012) Research and development plan for the large and small stock meat industries in South Africa, 2012-2013. www.rmrdsa.co.za
|
[9]
|
Ferrell, C.L. and Jenkins, T.G. (1982) Efficiency of cows of different size and milk production potential. Rlhusmarc Germ Plasm Evaluation Report 10:12.
|
[10]
|
Scholtz, M.M., Steyn, Y., van Marle-Koster, E. and Theron, H.E. (2012) Improved production efficiency in cattle to reduce the carbon footprint of beef. South African Journal of Animal Science, 42, 450-453.
doi:10.4314/sajas.v42i5.1
|
[11]
|
Wall, E., Simm, G. and Moran, D. (2010) Developing breeding schemes to assist mitigation of greenhouse gas emissions. Animal, l4, 1-11.
http://journals.cambridge.org/download.php?file=%2F23244_2DAE6017E006E2DC33F2C51B28655EAB_journals__ ANM_ANM4_03_S175173110999070Xa.pdf&cover=Y&code=5613ceca0ea6daec8a9e7b504bdd5319
|
[12]
|
Schoeman, S.J. (2010) Crossbreeding in beef cattle. In: Scholtz, M., Ed., Beef Breeding in South Africa. 2nd Edition, ARC, Pretoria, 21-32.
|
[13]
|
Meissner, H.H., Hofmeyr, H.S., Van Rensburg, W.J.J.l. and Pienaar, J.P. (1983) Classification of livestock for realistic prediction of substitution values in terms of a biologically defined large stock unit. Department of Agriculture, Pretoria.
|
[14]
|
Thorne, M.S. and Stevenson, M.H. (2007) Stocking rate: The most important tool in the toolbox. College of Tropical Agriculture and Human Resources. University of Hawaii, Manoa.
http://www.ctahr.hawaii.edu/oc/freepubs/pdf/PRM-4.pdf
|
[15]
|
Neser, F.W.C. (2012) unpublished.
http://www.rpo.co.za/documents/pptrpo/proffrikkieneser.pdf
|
[16]
|
Weil Jr., W.B. (1962) Adjustment for size—A possible misuse of ratios. American Journal of Clinical Nutrition, 11, 49. http://ajcn.nutrition.org/content/11/3/249.short
|
[17]
|
MacNeil, M.D. (2007) Retrospective analysis of selection applied to a ratio. American Society of Animal Science, 58.
www.ars.usda.gov/research/publications/publications.html
|