Reproductive Performance for Four Breeds of Swine: Crossbred Females and Purebred and Crossbred Boars
نویسندگان
چکیده
منابع مشابه
Reproductive performance for four breeds of swine: crossbred females and purebred and crossbred boars.
Matings and litters were studied involving all three-breed crosses (sired by purebred boars) and four-breed crosses (sired by cross-bred boars) from the Duroc, Yorkshire, Landrace and Spotted breeds. There were 764 female mating records and 161 boars used over five sequential breeding seasons. A sample of pregnant gilts was slaughtered each season and the remainder were allowed to carry their l...
متن کاملGrowth performance for four breeds of swine: crossbred females and purebred and crossbred boars.
Purebred and two-breed cross (F1) boars were mated to F1 females to produce all possible three- and four-breed cross pigs involving the Duroc, Yorkshire, Landrace and Spotted breeds. Individual postweaning average daily gain (ADG), age at 100 kg (AGE) and probed backfat thickness at 100 kg (BF) data were collected on 3,456 pigs. A total of 213 pens with an average of 15.58 pigs per pen was eval...
متن کاملReproductive and testicular characteristics of purebred and crossbred boars.
Purebred Hampshire, Duroc and crossbred (H x D, D x H) boars were studied to evaluate reproductive characteristics. One hundred seventeen boars were castrated at 7Y:! months of age to evaluate testicular weights and sperm numbers. Seventy-eight additional boars were studied to evaluate conception rate and embryo numbers when mated to Yorkshire gilts. Rate of gain and backfat probe were also ava...
متن کاملSow productivity comparisons for four breeds of swine: purebred and crossbred litters.
Data were collected from 366 litters produced in a four-breed (Duroc, Yorkshire, Spotted and Landrace) diallel mating system. Purebred and crossbred litters were farrowed during five consecutive (fall and spring) farrowing seasons (fall 1976 through fall 1978). Litters were produced by randomly mating boars of each breed to at least one female of each breed. Litter size and weight at birth, lit...
متن کاملReproductive Efficiency of Purebred and Crossbred Dairy Cattle
Nine measures related to breeding efficiency were used for comparisons among purebred Ayrshires, Brown Swiss, Holsteins, and Jerseys and between purebreds and 32 crossbred groups representing 2-breed, 3-breed, 5/8, and backcrosses by purebred sires and progeny of crossbred sires. There were four herds wi th Holsteins common to all, Brown Swiss and Jerseys in three herds and Ayrshires in one her...
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ژورنال
عنوان ژورنال: Journal of Animal Science
سال: 1984
ISSN: 0021-8812,1525-3163
DOI: 10.2527/jas1984.594948x