Production data of 366 individuals in the Dohne Merino Development programme at the Dohne Agricultural Research Institute, were used for the estimation of the heritabilities of 15 production traits. Halfsib analyses were applied to data corrected for identifiable environmental factors…
To determine the influence of the age of the ewe on characteristics such as body mass, greasy fleece mass, clean fleece mass, fibre diameter and staple length, the data obtained from 500 ewes born between 1970 and 1979 were used.…
Variance components and breeding values of production traits and somatic cell score of South African Guernsey, Ayrshire, Holstein and Jersey breeds have been estimated using a multi-lactation repeatability test-day model, including tests of the first three lactations as repeated measures…
Production traits of chickens of the Lesotho line, namely: body weight, body weight gain, feed conversion ratio (FCR) and mortality, were compared with four South African indigenous lines (Ovambo, Potchefstroom Koekoek, Lebowa-Venda and Naked Neck) and two exotic lines (Rhode…
Data from 267 individuals were used to. investigate factors influencing 13 linear type traits (scored on a 1-50 point scale) in progeny of a Merino flock subjected to 20 years of selection for increased clean fleece mass (Selection Group, 116…
Data of 5342 progeny from 232 sires from 30 genetically linked flocks, collected through the National Progeny Testing program for Merino sheep from 1991 to 1996, were used to estimate heritabilities for several production and type traits. The traits analysed…
Data obtained from the INTERGIS for Jersey breeders participating in the NationalDairy Cattle Performance and Progeny Testing Scheme were analysed. The registered and grade records commenced in test year 1977 through 1992 (incomplete) and consisting of lactations between 240 and…
