Swine BREEDING A Comparison of Mating Systems Utilizing Duroc, Hampshire and Yorkshire Breeds for Swine Production
نویسندگان
چکیده
This study utilized eight years of crossbreeding data at this station to compare the number of pigs produced by different mating systems using Duroc, Hampshire and Yorkshire breeds. Mating systems were defined to include the purebred and crossbred herds. These were herds required to produce replacement breeding stock for commercial pig production for a particular two-breed terminal, two-breed rotation, threebreed terminal, three-breed rotation or backcross mating scheme. The best three-breed terminal crossbred system was a Duroc sire mated to a Hampshire-Yorkshire female (D-HY). This system produced 3.8 percent and 2.9 percent more market pigs than Yorkshire X Duroc-Hampshire (Y-DH) and Hampshire X Duroc-Yorkshire (H-DY) crosses. A backcross system using a Yorkshire sire mated to a Duroc-Yorkshire female (Y-DY) produced 2.4 percent more pigs than the D-HY system. The three-breed rotation and DurocYorkshire rotation produced 3.3 percent and 2.9 percent fewer pigs than D-HY respectively. A greater reduction in production as compared to D-HY was predicted for Duroc-Hampshire and Hampshire-Yorkshire rotations which produced 13.0 percent and 7.9 percent fewer pigs, respectively. The three-breed rotation maintained 91 percent of the farrowing sows in commercial production as compared to 76 percent for D-HY and about 81 percent for the backcross system Y-DY. In the three-breed terminal system D-HY, about 8 percent of the farrowing females were Duroc and about 16 percent were of Yorkshire and Hampshire breeding.
منابع مشابه
Comparisons of Mating Systems with Duroc, Hampshire and Yorkshire Breeds of Swine for Efficiency of Swine Production
متن کامل
Comparison of three-breed and backcross swine for litter productivity and postweaning performance.
Duroc, Hampshire and Yorkshire boars were mated with crossbred gilts of Duroc-Hampshire, Duroc-Yorkshire and Hampshire-Yorkshire breeding to produce 133 three-breed and 259 backcross litters that were farrowed during four seasons beginning in the fall of 1975. Three-breed cross litters were .31 +/- .27, .57 +/- .24 and .50 +/- .24 pigs larger than backcross litters at birth, 21 and 42 days, res...
متن کاملGenetic parameters and trends for lean growth rate and its comvonents in U.S. Yorkshire, Duroc, Hampshire, and Landrace pigs.
Records on 361,300 Yorkshire, 154,833 Duroc, 99,311 Hampshire, and 71,097 Landrace pigs collected between 1985 and April of 2000 in herds on the National Swine Registry Swine Testing and Genetic Evaluation System were analyzed. Animal model and REML procedures were used to estimate random effects of animal genetic, common litter, maternal genetic, and the covariances between animal and maternal...
متن کاملPedigree analysis of 5 swine breeds in the United States and the implications for genetic conservation.
Globally, genetic diversity of livestock populations is contracting. Knowing the true extent of the contraction is needed to develop effective conservation strategies. Although contractions of genetic diversity have been documented at the breed level, little within breed documentation has occurred. This situation is no different for US swine breeds. Therefore, the objective of this study was to...
متن کاملGenetic parameters for growth rate and backfat in Canadian Yorkshire, Landrace, Duroc, and Hampshire pigs.
Records on 47,360 Yorkshire, 28,762 Landrace, 14,020 Duroc, and 9,983 Hampshire pigs for backfat depth and days to 100 kg made between 1989 and 1992 in herds on the Ontario Swine Improvement Program (OSIP) were used to estimate additive genetic (animal), common environmental (litter), and residual variances and covariances of the two traits. Analysis was by the DFREML program of K. Meyer using ...
متن کامل