Creation of gp line on the basis of gene exchange between French and American Yorkshires and breeding through 3 generations
The experiments were conducted to evaluate the process of self-crossing to select and create a GP line on the basis of gene exchange between Yorkshire pigs imported from France and from the USA. Two pig herds of YVN1 (♂ French Yorkshire x ♀ American Yorkshire) and YVN2 (♂ American Yorkshire x ♀ French Yorkshire) were bred and selected through 3 generations. Results show that YVN2 pigs were selected as the GP line with the following main performances: In the growing period, ADG was 859,47 g/day, the lean meat was 59,83% and FCR was 2.46 kg. The semen quality of boars was 53,44 (billion/ time)in VAC. The reproductive performance: NB, NBA and NPW were 13.47, 12.59 and 12.20, respectively; The average weight of piglets at birth and weaning were 1.43 and 6.58 kg, respectively; the number of weaning piglets/sow/year was 28.42. The GP line of YVN2 meets the demands of our country's livestock production
