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GADI Research Reports

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Year	Contents
2016	Evaluation of selection for reproduction in Dohne Merino sheep Quantification of the genetic relationship between reproduction and body weight in different sheep flocks Genetic analysis of body weight in the Grootfontein Merino stud Evaluation of production and reproduction of three Angora goat CYP17 genotypes Establishment of a reference population for future implementation of genomic breeding values for the South African Merino sheep breed Genome wide association study to identify genetic markers associated with resistance to Haemonchus contortus in sheep Evaluation of a frozen semen protocol for South African Angora goats Determination of the digestibility of feedlot rations containing different inclusion levels of roughage (Medicago sativa) by sheep Evaluation of the feed supplement, Graze Boost, with wool sheep lambs on a high fibre diet under penned conditions Establishment of the South African biological reserve for small stock research and conservation Establishment and maintenance of live flocks of the endangered Namaqua Afrikaner sheep breed in South Africa Maintenance of live flocks of Angora goats as reference flocks for a biological bank for Angora goats in South Africa Maintenance of two Merino flocks as resource flocks for research and reference flocks for a biological bank for Merino sheep in South Africa Maintenance of an Afrino flock as resource for research and as reference flock for a biological bank for Afrino sheep in South Africa Characterisation and cryopreservation of semen of the indigenous Namaqua Afrikaner sheep breed Blood and DNA bank for genomic research in sheep and goat breeds in South Africa Evaluating carbon footprints of various livestock systems and management practices in the False Upper Karoo farming areas Satansbos monitoring and control A monitoring framework towards rangeland monitoring and management within the arid and semi-arid rangelands of the Eastern and Northern Cape – Carnarvon area A monitoring framework towards rangeland monitoring and management within the arid and semi-arid rangelands of the Eastern and Northern Cape – Middelburg area Determining the cattle and sheep grazing impact in the Eastern Mixed Karoo Using lucerne to provide nitrogen fertilizer in a vegetable intercropping system Control of the invasive grey poplar (Populus x canescens) using mechanical removal and grazing by livestock [more ...]
2015	Evaluation of selection for reproduction in Dohne Merino sheep Quantification of the genetic relationship between reproduction and body weight in different sheep flocks Genetic analysis of body weight in the Grootfontein Merino stud The evaluation of the presence of nematophagous fungi on pasture in the False Upper Karoo areas and the potential for use as biological control agents of free-living stages of parasitic nematode with the emphasis on the control of Haemonchus contortus Establishment of a reference population for future implementation of genomic breeding values for the South African Merino sheep breed Investigation into the relationship between milk production of grazing ewes and maternal breeding values for early growth traits in South African sheep flocks Evaluation of a frozen semen protocol for South African Angora goats Flockmaster: A comprehensive veterinary flock health management support service for commercial sheep farmers Determination of the digestibility of feedlot rations containing different inclusion levels of roughage (Medicago sativa) by sheep Establishment of the South African biological reserve for small stock research and conservation Establishment and maintenance of live herds of the endangered Namaqua Afrikaner sheep breed in South Africa Maintenance of live herds of Angora goats as reference herds for a biological bank for Angora goats in South Africa Maintenance of two Merino herds as resource herds for research and reference herds for a biological bank for Merino sheep in South Africa Maintenance of an Afrino herd as resource for research and as reference herd for a biological bank for Afrino sheep in South Africa Characterisation and cryopreservation of semen of the indigenous Namaqua Afrikaner sheep breed Blood and DNA bank for genomic research in sheep and goat breeds in South Africa Factors affecting seed germination and emergence of honey locust (Gleditsia triacanthos A monitoring framework towards rangeland monitoring and management within the arid and semi-arid rangelands of the Eastern and Northern Cape – Carnarvon area A monitoring framework towards rangeland monitoring and management within the arid and semi-arid rangelands of the Eastern and Northern Cape – Middelburg (EC) area Determining the cattle and sheep grazing impact in the Eastern Mixed Karoo Using lucerne to provide nitrogen fertilizer in a vegetable intercropping system [more ...]
2014	Evaluation of selection for reproduction in Dohne Merino sheep Quantification of the genetic relationship between reproduction and body weight in different sheep flocks Genetic analysis of body weight in the Grootfontein Merino stud Investigation into the relationship between milk production of grazing ewes and maternal breeding values for early growth traits in South African sheep flocks The evaluation of the presence of nematophagous fungi on pasture in the False Upper Karoo areas and the potential for use as biological control agents of free-living stages of parasitic nematode with the emphasis on the control of Haemonchus contortus Longevity of production in South African Angora goat ewes The effect of supplementation of replacement ewes after weaning on their lifetime reproduction potential under natural veld conditions Prediction of lambing date based on clinical examination prior to parturition in ewes Flockmaster: A comprehensive veterinary flock health management support service for commercial sheep farmers Establishment of the South African biological reserve for small stock research and conservation Establishment and maintenance of live herds of the endangered Namaqua Afrikaner sheep breed in South Africa Maintenance of live herds of Angora goats as reference herds for a biological bank for Angora goats in South Africa Maintenance of two Merino herds as resource herds for research and reference herds for a biological bank for Merino sheep in South Africa Maintenance of an Afrino herd as resource for research and as reference herd for a biological bank for Afrino sheep in South Africa Blood and DNA bank for genomic research in sheep and goat breeds in South Africa Evaluation of prickly pear cultivars to determine their adaptability in terms of fruit and leaf yield in the False Upper Karoo – Middelburg Region A monitoring framework towards rangeland monitoring and management within the arid and semi-arid rangelands of the Eastern and Northern Cape – Carnarvon area A monitoring framework towards rangeland monitoring and management within the arid and semi-arid rangelands of the Eastern and Northern Cape – Koopmansfontein area A monitoring framework towards rangeland monitoring and management within the arid and semi-arid rangelands of the Eastern and Northern Cape – Middelburg area Determining the cattle and sheep grazing impact in the Eastern Mixed Karoo [more ...]
2013	Evaluation of selection for reproduction in Dohne Merino sheep Investigation into the relationship between milk production of grazing ewes and maternal breeding values for early growth traits in South African sheep flocks Quantification of the genetic relationship between reproduction and body weight in different sheep flocks The evaluation of the presence of nematophagous fungi on pasture in the False Upper Karoo areas and the potential for use as biological control agents of free-living stages of parasitic nematode with the emphasis on the control of Haemonchus contortus Longevity of production in South African Angora goat ewes Evaluation of management practices of Angora goat sires to improve semen quality The effect of supplementation of replacement ewes after weaning on their lifetime reproduction potential under natural veld conditions Prediction of lambing date based on clinical examination prior to parturition in ewes Flockmaster: A comprehensive veterinary flock health management support service for commercial sheep farmers Effect of water and feed supplementation during overnight kraaling on sheep production Evaluation of the effectiveness of protective coats made from Ripstop nylon to prevent mortality in Angora goats during adverse weather conditions under field conditions Evaluation of the effect of a live chlamydiosis vaccine on ram genital soundness Effect of lick supplementation during overnight kraaling on reproduction and production of sheep in the communal areas Establishment of ram breeding flocks for different communal farming areas of the Eastern Cape Establishment of the South African biological reserve for small stock research and conservation Establishment and maintenance of live herds of the endangered Namaqua Afrikaner sheep breed in South Africa Maintenance of live herds of Angora goats as reference herds for a biological bank for Angora goats in South Africa Maintenance of two Merino herds as resource herds for research and reference herds for a biological bank for Merino sheep in South Africa Maintenance of an Afrino herd as resource for research and as reference herd for a biological bank for Afrino sheep in South Africa Maintenance of an Angora goat resource herd at Grootfontein Agricultural Development Institute Blood and DNA bank for genomic research in sheep and goat breeds in South Africa Fixed season grazing of the mountain paddock in the False Upper Karoo Short-term effect of fire on vegetation structure and composition at a site in the Eastern Karoo Determining the optimum grazing capacity for the Arid Karoo - Carnarvon Determining the cattle and sheep grazing impact in the Eastern Mixed Karoo Herbicide control of invasive cactus species Herbicide control of slangbos (Seriphium plumosum) using full-cover and spot-spray methods [more ...]
2012	Evaluation of selection for reproduction in Dohne Merino sheep Investigation into the relationship between milk production of grazing ewes and maternal breeding values for early growth traits in South African sheep flocks The evaluation of the presence of nematophagous fungi on pasture in the False Upper Karoo areas and the potential for use as biological control agents of free-living stages of parasitic nematode with the emphasis on the control of Haemonchus contortus Longevity of production in South African Angora goat ewes Evaluation of management practices of Angora goat sires to improve semen quality The effect of supplementation of replacement ewes after weaning on their lifetime reproduction potential under natural veld conditions Prediction of lambing date based on clinical examination prior to parturition in ewes Flockmaster: A comprehensive veterinary flock health management support service for commercial sheep farmers Identification of the most economical energy level in lucerne (Medicago sativa) hay-based finishing diets for Dohne Merino lambs The effect of different levels of urea supplementation on reproduction, production and physiological parameters of wool ewes Establishment of ram breeding flocks for different communal farming areas of the Eastern Cape Establishment of the South African biological reserve for small stock research and conservation Establishment and maintenance of live herds of the endangered Namaqua Afrikaner sheep breed in South Africa Maintenance of live herds of Angora goats as reference herds for a biological bank for Angora goats in South Africa Maintenance of two Merino herds as resource herds for research and reference herds for a biological bank for Merino sheep in South Africa Maintenance of an Afrino herd as resource for research and as reference herd for a biological bank for Afrino sheep in South Africa Blood and DNA bank for genomic research in sheep and goat breeds in South Africa Long-term grazing trials in the Karoo: Camp 6 Determining the cattle and sheep grazing impact in the Eastern Mixed Karoo The evaluation of dry matter yield and forage quality for four pastures as influenced by three frequencies of flood irrigation in the False Upper Karoo The establishment of the Grootfontein Electronic Herbarium for the flora of the Eastern Upper Karoo Fire and grazing effects on vegetation and soils following an accidental fire in the Eastern Upper Karoo A monitoring framework towards rangeland monitoring and management within the arid and semi-arid rangelands of the Eastern and Northern Cape – Koopmansfontein area Evaluation of prickly pear cultivars to determine their adaptability in terms of fruit and leaf yield in the Eastern Upper Karoo – Middelburg region Effects of residual soil tebuthiuron on seed germination [more ...]
2011	Genetic and phenotypic characterisation of Namaqua Afrikaner sheep Evaluation of selection for reproduction in Dohne Merino sheep Investigation into the relationship between milk production of grazing ewes and maternal breeding values for early growth traits in South African sheep flocks Investigation into the extent of micron blow-out in South African wool sheep Increasing genetic progress in South African Angora goats through improved pedigree integrity The effect of supplementation of replacement ewes after weaning on their lifetime reproduction potential under natural veld conditions A comprehensive system for managing reproductive failure in small domestic ruminants Prediction of lambing date based on clinical examination prior to parturition in ewes Investigation into the cause, predisposing factors and effective treatment of swelling disease in South African Angora goats Investigation of protective coats for prevention of mortality in Angora goats during adverse weather conditions The effect of the inclusion of an ionophore as a silage additive on silage characteristics Identification of the most economical energy level in lucerne (Medicago sativa) hay-based finishing diets for Dorper lambs The effect of different levels of urea supplementation on reproduction, production and physiological parameters of wool ewes Establishment of ram breeding flocks for different communal farming areas of the Eastern Cape Establishment of the South African biological reserve for small stock research and conservation Establishment and maintenance of live herds of the endangered Namaqua Afrikaner sheep breed in South Africa Maintenance of live herds of Angora goats as reference herds for a biological bank for Angora goats in South Africa Maintenance of two Merino herds as resource herds for research and reference herds for a biological bank for Merino sheep in South Africa Maintenance of an Afrino herd as resource for research and as reference herd for a biological bank for Afrino sheep in South Africa Blood and DNA bank for genomic research in sheep and goat breeds in South Africa Longevity of production in South African Angora goat ewes Long-term grazing trials in the Karoo: Camp 6 and Bergkamp Determining the cattle and sheep grazing impact in the Eastern Mixed Karoo The evaluation of dry matter yield and forage quality for four pastures as influenced by three frequencies of flood irrigation in the False Upper Karoo The establishment of the Grootfontein Electronic Herbarium for the flora of the Eastern Upper Karoo A monitoring framework towards rangeland monitoring and management within the arid and semi-arid rangelands of the Eastern and Northern Cape - Karakul A monitoring framework towards rangeland monitoring and management within the arid and semi-arid rangelands of the Eastern and Northern Cape – Koopmansfontein area Evaluation of prickly pear cultivars to determine their adaptability in terms of fruit and leaf yield in the Eastern Upper Karoo – Middelburg region Mortality and composition effects of tebuthiuron and glyphosate on Seriphium plumosum Determination of economic norms and standards for sheep, goat and cattle enterprises in South Africa [more ...]
2010	Genetic and phenotypic characterisation of Namaqua Afrikaner sheep Investigation into the relationship between milk production of grazing ewes and maternal breeding values for early growth traits in South African sheep flocks Investigation into the extent of micron blow-out in South African wool sheep The effect of supplementation of replacement ewes after weaning on their lifetime reproduction potential under natural veld conditions A comprehensive system for managing reproductive failure in small domestic ruminants Investigation into the cause, predisposing factors and effective treatment of swelling disease in South African Angrao goats The effect of the inclusion of an ionophore as a silage additive on silage characteristics Identification of the most economical energy level in lucerne (Medicago sativa) hay-based finishing diets for lambs Establishment of ram breeding flocks for different communal farming areas of the Eastern Cape Establishment of the South African biological reserve for small stock research and conservation Establishment and maintenance of live herds of the endangered Namaqua Afrikaner sheep breed in South Africa Maintenance of live herds of Angora goats as reference herds for a biological bank for Angora goats in South Africa Maintenance of two Merino herds as resource herds for research and reference herds for a biological bank for Merino sheep in South Africa Maintenance of an Afrino herd as resource for research and as reference herd for a biological bank for Afrino sheep in South Africa Blood and DNA bank for genomic research in sheep and goat breeds in South Africa The long-term evaluation of restoration technologies applied in the False Upper Karoo (Middelburg, EC) Fixed season grazing of the mountain paddock in the Eastern Upper Karoo - Photomonitoring Determining the cattle and sheep grazing impact in the Eastern Mixed Karoo The determination of precipitation loss due to canopy interception of five selected Karoo dwarf shrub species The evaluation of dry matter yield and forage quality for four pastures as influenced by three frequencies of flood irrigation in the False Upper Karoo The establishment of the Grootfontein Electronic Herbarium for the flora of the False Upper Karoo A monitoring framework towards rangeland monitoring and management within the arid and semi-arid rangelands of the Eastern and Northern Cape - Carnarvon area A monitoring framework towards rangeland monitoring and management within the arid and semi-arid rangelands of the Eastern and Northern Cape - Koopmansfontein area Evaluation of prickly pear cultivars to determine their adaptability in terms of fruit and leaf yield in the Eastern Upper Karoo - Middelburg region Determination of economic norms and standards for sheep, goats and cattle enterprises in South Africa [more ...]
2009	Investigation into production and reproduction selection criteria in Afrino sheep Establishment of a genetic pool of dual purpose sheep with premium quality meat and super fine wool under extensive conditions Genetic and phenotypic characterisation of Namaqua Afrikaner sheep Evaluation of selection criteria for Boer goats under extensive conditions Investigation into the relationship between milk production of grazing ewes and maternal breeding values for early growth traits in South African sheep flocks Integrated nematode parasite control in small ruminant flocks in semi-arid areas of South Africa with emphasis on the control of Haemonchus contortus and Teladorsagia circumcincta Breeding sheep for increased profit per hectare Investigation into the extent of micron blow-out in South African wool sheep Evaluation of a frozen semen protocol for South African Angora goats The effect of supplementation of replacement ewes after weaning on their lifetime reproduction potential under natural veld conditions A comprehensive system for managing reproductive failure in small domestic ruminants Investigation into the cause, predisposing factors and effective treatment of swelling disease in South African Angora goats The effect of the inclusion of an ionophore as a silage additive on silage characteristics Establishment of ram breeding flocks for different communal farming areas of the Eastern Cape Establishment of the South African biological reserve for small stock research and conservation Establishment and maintenance of live herds of the endangered Namaqua Afrikaner sheep breed in South Africa Establishment and maintenance of a cryopreservation bank for the endangered Namaqua Afrikaner sheep breed in Southern Africa Blood and DNA bank for genomic research in sheep and goat breeds in South Africa The long-term evaluation of restoration technologies applied in the False Upper Karoo (Middelburg, EC) The establishment of the Grootfontein Electronic Herbarium for the flora of the False Upper Karoo Determining the optimum grazing capacity in the Eastern Mixed Karoo Determining the cattle and sheep grazing impact in the Eastern Mixed Karoo Fixed season continuous and rotational grazing of the pediments and plains in the False Upper Karoo Fixed season grazing of the mountain paddock in the False Upper Karoo [more ...]
2008	Investigation into production and reproduction selection criteria in Afrino sheep Establishment of a genetic pool of dual purpose sheep with premium quality meat and super fine wool under extensive conditions Development of a method for the estimation of breeding values for resistance of sheep to internal parasites, which will be applicable under any environmental conditions Investigation into the effect of different types of teats on the production and reproduction of Boer goats Investigation into the relationship between milk production of grazing ewes and maternal breeding values for early growth traits in South African sheep flocks Breeding sheep for increased profit per hectare Investigation into the extent of micron blow-out in South African wool sheep The effect of early growth environment of Dorper lambs on M. longissimus dorsi area at 16 months of age The effect of supplementation of replacement ewes after weaning on their lifetime reproduction potential under natural veld conditions Investigation into the cause, predisposing factors and effective treatment of swelling disease in South African Angora goats An investigation into the effect of different weaning practices on the post-weaning growth of Angora kids and reproduction of Angora ewes Effect of dietary chromium levels on fat deposition, carcass and meat characteristics of Dorper lambs The effect of the inclusion of an ionophore as a silage additive on silage characteristics Establishment of ram breeding flocks for different communal farming areas of the Eastern Cape The effect of methionine supplementation on staple length and fibre diameter in wool sheep Establishment of the South African biological reserve for small stock research and conservation Determining the cattle and sheep grazing impact in the Eastern Mixed Karoo Fixed season continuous and rotational grazing of the pediments and plains in the False Upper Karoo Determining the optimum grazing capacity in the Eastern Mixed Karoo Fixed season grazing of the mountain paddock in the False Upper Karoo [more ...]
2007	Investigation into production and reproduction selection criteria in Afrino sheep Establishment of a genetic pool of dual purpose sheep with premium quality meat and super fine wool under extensive conditions Development of a method for the estimation of breeding values for resistance/resilience of sheep to internal parasites, which will be applicable under any environmental conditions Investigation into the selection criteria of Merino sheep Evaluation of selection criteria for Boer goats under extensive conditions Investigation into the relationship between milk production of grazing ewes and maternal breeding values for early growth traits in three South African sheep flocks Breeding sheep for increased profit per hectare Investigation into the extent of micron blowout in South African wool sheep The effect of early growth environment of Dorper lambs on M. Longissimus dorsi area at 16 months of age Investigation into reproduction and kid mortality of South African Angora goats Breeding program for livestock guarding dogs A survey on the effectiveness of different problem animal control methods in the small stock producing areas of South Africa Investigation into the cause, predisposing factors and effective treatment of swelling disease in South African Angora goats An investigation into the effect of different weaning practices on the post-weaning growth of Angora kids and reproduction of Angora ewes Investigation into the effect of plants as deworming agents in the Valley Bushveld in Boer goats Investigation into the effect of vitamin B12 supplementation on the growth of Dorper lambs at Koopmansfontein Experimental Station Establishment of ram breeding flocks for different communal farming areas of the Eastern Cape Evaluation of the genetic potential for growth and wool production of typical Transkei ewes and rams The effect of methionine supplementation on staple length and fibre diameter in wool sheep Establishment of a biological bank for the Angora goat population in South Africa Determining the optimum grazing capacity in the Eastern Mixed Karoo Fixed season grazing of the mountain paddock in the False Upper Karoo Fixed season continuous and rotational grazing of the pediments and plains in the False Upper Karoo Evaluation of tall fescue cultivars under irrigation [more ...]
2006	Investigation into production and reproduction selection criteria in Afrino sheep Evaluation of genetic fine wool animals under natural conditions in the non-traditional fine wool producing areas of the RSA Establishment of a genetic pool of dual purpose sheep with premium quality meat and super fine wool under extensive conditions Development of a method for the estimation of breeding values for resistance/resilience of sheep to internal parasites, which will be applicable under any environmental conditions Investigation into the selection criteria of Merino sheep Evaluation of selection criteria for Boer goats under extensive conditions Investigation into the relationship between milk production of grazing ewes and maternal breeding values for early growth traits in three South African sheep flocks Establishment of a biological bank for the Angora goat population in South Africa Breeding Merino sheep for increased profit per small stock unit Investigation into reproduction and kid mortality of South African Angora goats Breeding program for livestock guarding dogs A survey on the effectiveness of different problem animal control methods in the small stock producing areas of South Africa Investigation into the cause, predisposing factors and effective treatment of swelling disease in South African Angora goats An investigation into the effect of different weaning practices on the post-weaning growth of Angora kids Development of simulation models for livestock enterprises Establishment of ram breeding flocks for different communal farming areas of the Eastern Cape Evaluation of the genetic potential for growth and wool production of typical Transkei ewes and rams Determining the optimum grazing capacity in the Eastern Mixed Karoo Evaluation of fescue cultivars Evaluating tall fescue under grazing The mountain paddock grazing experiment [more ...]
2005	Establishment of ram breeding flocks for different communal farming areas of the Eastern Cape Evaluation of the genetic potential for growth and wool production of typical Transkei ewes and rams Performance recording and production data for woolled sheep in the communal areas of the Eastern Cape Breeding merino sheep for increased profit per small stock unit Investigation into production and reproduction selection criteria in Afrino sheep The upgrading of a genetic fine wool Merino stud Evaluation of genetic fine wool animals under natural conditions in the non-traditional fine wool producing areas of the RSA Establishment of a genetic pool of dual purpose sheep with premium quality meat and super fine wool under extensive conditions Development of a method for the estimation of breeding values for resistance/resilience of sheep to internal parasites, which will be applicable under any environmental conditions Investigation into the selection criteria of Merino sheep Evaluation of selection criteria for Boer goats under extensive conditions Investigation into the relationship between milk production of grazing ewes and maternal breeding values for early growth traits in three South African sheep flocks Establishment of a biological bank for the Angora goat population in South Africa Feed intake and digestibility of sheep with varying estimated breeding values for mature body weight Investigation into reproduction and kid mortality of South African Angora goats Bypass protein supplementation of late pregnant and lactating sheep and Angora goats in the different grazing areas of South Africa An investigation into the effect of supplementation of sheep and Angora goats with a commercial trace mineral supplement on reproduction and production Investigation into the effect of vitamin A supplementation on the reproduction of sheep and goats A survey on the effectiveness of different problem animal control methods in the small stock producing areas of South Africa Investigation into the cause, predisposing factors and effective treatment of swelling disease in South African Angora goats An investigation into the effect of different weaning practices on the post-weaning growth of Angora kids Accurate clip classing of mohair for fineness through the technique of EGT (Every Goat Tested) Breeding program for livestock guarding dogs Veld regeneration after fire in the Kalahari Thornveld Developing grazing index values Determining the cattle and sheep grazing impact in the eastern mixed Karoo Chemical control of Rhigozum trichotomum (driedoring) The camp 6 grazing experiment The mountain paddock grazing experiment Determining the optimum grazing capacity in the eastern mixed Karoo Evaluation of fescue cultivars Evaluating tall fescue under grazing [more ...]