R
R. K. Johnson
Researcher at Oklahoma State University–Stillwater
Publications - 11
Citations - 270
R. K. Johnson is an academic researcher from Oklahoma State University–Stillwater. The author has contributed to research in topics: Breed & Purebred. The author has an hindex of 10, co-authored 11 publications receiving 264 citations.
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Journal ArticleDOI
Genetic and Phenotypic Relationships between Pubertal and Growth Characteristics of Gilts
Journal ArticleDOI
Individual Heterosis and Breed Effects for Postweaning Performance and Carcass Traits in Four Breeds of Swine
TL;DR: Individual heterosis and direct and maternal breed effects for postweaning average daily gain (ADG), off-test age (AGE) and probed backfat thickness (BF) were estimated from data on 1,664 pigs produced in a complete diallel mating system involving the Duroc, Yorkshire, Landrace and Spotted breeds.
Journal ArticleDOI
Reproductive Performance for Four Breeds of Swine: Crossbred Females and Purebred and Crossbred Boars
D. S. Buchanan,R. K. Johnson +1 more
TL;DR: There were no significant differences among the boar breeding groups for litter size, weight or survival rate, and the six crossbred female groups (reciprocal crosses were combined) did not differ significantly in conception rate or number of services/conception.
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Sow productivity comparisons for four breeds of swine: purebred and crossbred litters
TL;DR: Purebred and crossbred litters were farrowed during five consecutive farrowing seasons (fall 1976 through fall 1978) and significant heterosis estimates were obtained for litter size and weight at weaning and for survival rate.