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  • Influence
Genetic relationships between sex-specific traits in beef cattle: mature weight, weight adjusted for body condition score, height and body condition score of cows, and carcass traits of their steer
Data from the first four cycles of the Germplasm Evaluation Program at the U.S. Meat Animal Research Center (USMARC) were used to investigate genetic relationships between mature weight (MW, n =Expand
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Rate of inbreeding and effective population size in four major South African dairy cattle breeds
Pedigree information on the registered South African Ayrshire (n = 47 116), Guernsey (n = 18 766), Holstein (n = 892 458) and Jersey (n = 314 403) breeds was analyzed to determine the rate ofExpand
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  • Open Access
Genetic parameter estimates for tick resistance in Bonsmara cattle
The objectives of the study were to estimate geneti c parameters for tick resistance and to evaluate the effect of the level of tick infestation on the estimates of genetic parameters for SouthExpand
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  • Open Access
Application of random regression models to the genetic evaluation of cow weight in Bonsmara cattle of South Africa
Repeated records (n = 58,295) of Bonsmara cows were used to evaluate mature cow weight (CW), using random regression animal models (RRM). Cows (n = 11,847), age two to 11 years (AY), were weighed atExpand
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  • Open Access
The influence of stocking density on body weight, egg weight, and feed intake of adult broiler breeder hens.
The influence of stocking density on BW, egg weight (EW), and feed intake (FI) in Ross broiler breeder hens (n = 120) was investigated during the late medium egg production period (from 50 to 54 wkExpand
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Estimates of genetic parameters and effect of inbreeding on milk yield and composition in South African Jersey cows
The effect of inbreeding on the 305-d yields of milk, fat and protein, and the percentages of fat and protein in the first three lactations was estimated using records on the South African JerseyExpand
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  • Open Access
The effect of herd of origin by year on post-weaning traits of young beef bulls at centralized testing centres in South Africa
The effects of herd of origin by year on the average daily gain (ADG), average daily feed intake (DFI), shoulder height (SDH) and scrotal circumference (SCR) of beef bulls at centralized test centresExpand
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  • Open Access
Genetic diversity in South African Nguni cattle ecotypes based on microsatellite markers
The Nguni cattle breed is a landrace breed adapted to different ecological regions of South Africa. A number of ecotypes are recognised based on phenotype within the breed, but it is not known ifExpand
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Analysis of stayability in South African Angus cattle using a threshold model
The objectives of the study were to estimate genetic parameters for stayability in the South African Angus cattle and to compare the sire and animal threshold models. Data and pedigree informationExpand
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  • Open Access