J
J.B. van Wyk
Researcher at University of the Free State
Publications - 93
Citations - 2134
J.B. van Wyk is an academic researcher from University of the Free State. The author has contributed to research in topics: Heritability & Genetic correlation. The author has an hindex of 25, co-authored 93 publications receiving 2014 citations.
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Genetic parameter estimates in sabi sheep
TL;DR: Though slow genetic progress is possible with all reproduction and survival traits, it would be more efficient to select for prolificacy but guarding against a higher lamb mortality.
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Direct and maternal (co) variance components and heritability estimates for body weight at different ages and fleece traits in Afrino sheep
TL;DR: Data, consisting of 4325 lamb records, the progeny of 146 sires and 946 dams, collected on the Carnarvon Afrino flock over the period 1975 to 1992, were used for this study and revealed no significant influence on clean fleece weight or mean fibre diameter.
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Genetic parameter estimates for pre-weaning weight traits in Dorper sheep.
TL;DR: It is concluded that the traits of the Dorper flock can be improved by selection with no serious antagonisms among traits studied.
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Characterisation of indigenous African cattle breeds in relation to meat quality traits
TL;DR: Higher myofibrillar fragmentation indices, as well as lower white muscle fibre percentages for the three indigenous breeds, especially the two Sanga breeds, proved their potential to produce meat of comparable tenderness to that of continental breeds under specific slaughter and post-slaughter conditions.
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Model comparisons and genetic and environmental parameter estimates of growth and the Kleiber ratio in Horro sheep
TL;DR: The relatively higher heritability in weight traits and the presence of positive and high correlations of weight traits with daily gain and Kleiber ratio tend to suggest that it would be more practical to select on the weight traits to improve gain and efficiency.