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Project No: PS5.1

Title: Optimum grazing capacity in Eastern Mixed Karoo
Project Leader: Dr PCV du Toit Starting date: 1989
Partners: Closing date: 2010
 
Objectives: To determine the optimum grazing capacity of the eastern mixed karoo for wooled sheep (Merino) and cattle, various breeds over the years, only one stocking rate is applied, this stocking rate is at the recommended norm of 16 ha/LSU, without a season's resting in order to directly compare this trial with several others running on Grootfontein, the cattle to sheep ratio is 1 tot 1 on a large stock unit basis, the paddocks are rotationally grazed, each season starting in a different set of paddocks, eleven paddocks are grazed and the period of occupation is 14 days,
Location: Grootfontein; Boesmanskop
Strategic Objectives Addressed:

 

Progress reports:

 

 

Publications:

 

Author Year Title Publication
Du Toit PCV, Botha WvD 1993 Grazing index values of Karoo plants Arid zone ecology forum 30 - 31.
Du Toit PCV 2001 Grazing Capacities from linepoint survey- and phytomass data Grootfontein Agric Vol 3 No 1(26-27)
Du Toit PCV 2002 The Boesmanskop grazing capacity benchmark for the Nama-Karoo Karoo Agric Vol5 No1 2002 (1-6)
du Toit PCV 2002 Modelling Nama-Karoo subshrub Phytomass production Proceedings GSSA / SASAS Joint Congress
Du Toit PCV, Botha W v D, Blom CD, Becker HR, Olivier DJ, Meyer EM, Barnard GZJ 1992 Estimating grazing index values for Karoo plants Arid zone ecology forum 27 - 28.
Jordaan G, du Toit PCV 1990 The relative grazing preferences for three saltbush species as determined with Dorper sheep at the College of Agriculture Annual Research Meeting of the Karoo Biome 1990: 26
du Toit PCV, Steynberg H, Erasmus TC 1990 Animal production on Saltbush grazing Arid Zone Ecology Forum 1990
Du Toit PCV 2001 Veldsamestelling in die Bo-Karoo Grootfontein Agric Vol 3 No 1 (22-25)
Du Toit PCV, Botha WvD, Blom CD, Becker R, Olivier DJ, Meyer T, Barnard 1995 Beraming van weidingsindekswaardes vir Karooplantspesies Staatsdrukker,Pretoria Tegniese mededeling no 239 P 1 -15
Du Toit PCV, Botha WvD, Blom CD, Becker R, Olivier DJ, Meyer T, Barnard 1993 A Technique for estimating the grazing index values of karoo plants Karoo Agric 5(2) p 10-14
Du Toit PCV 1995 Grazing index method of range condition assessment. African journal of range and forage science 12 (2)
Du Toit PCV, Botha WvD, Du Pisani LG, Blom CD, Oliver DJ 1998 Grazing index method procedures Grootfontein Agric, Vol1, No 1, 1998 (32-34)
Du Toit PCV 1995 The grazing index method of range condition assessment African Journal of RAnge and Forage science 12 (2) p 61-67
Du Toit PCV 1996 Development of a model to estimate grazing index values for Karoo plant species Unpublished PhD Thesis, University of Pretoria
Du Toit PCV 1997 A Comparison of the diets selected by Merino and Dorper sheep on three range types of the Karoo, South Africa Archivos de Zootecnia / Dorper News
Du Toit PCV 1998 Using acid detergent fibre in the estimate of total digestible nutrients of feeds and forages South African Journal of science 94:43-44
Du Toit PCV, Botha WvD, Blom CD 1995 Estimating grazing-index values for Karoo plants Technical Communication nr 239 p 1 - 15
Du Toit PCV 1998 Assessing veld condition in the Karoo African Journal of Range and Forage science -
Du Toit PCV 1998 Grazing index method procedures of vegetation surveys African Journal of Range and Forage Science - In Press
Du Toit PCV, Steynberg, Barnhoorn A 1992 Animal performance on saltbush grazing at Grootfontein and Carnarvon Bulletin van die Weidingsvereniging van suidelike afrika 3(1):35 (1992)
Du Toit PCV 1998 Die gebruik van suuroplosbare vesel by die beraming van totale verteerbare voedingstowwe Grootfontein Agric, Vol 1, No 1, 1998 (11-14)
Marais PG, du Toit PCV 2002 Livestock in a changing world Dorper News No 61, 2002
du Toit PCV 2000 Estimating grazing index values for plants from arid regions Journal of Range Management, 53(5) September 2000
Du Toit PCV 1998 Diets selected by Merino and Dorper sheep in Karoo veld Grootfontein Agric, Vol. 2, No 1, 1998
Du Toit PCV 1997 A study of diets selected in three arid veld types Arid sone ecology forum 1997: 15 -16
Du Toit PCV 1997 Modelling grazing index values for Karoo plants Arid Zone Ecology forum 1997: 16 -17