Great-grandfathers A(GGPA) and B(GGPB) are black at eight o'clock, while C(GGPC) and D(GGPD) are white. The main production performance is as follows:
Series A: The whole body is white, the nose, ears and limbs are black, the adult weight is 5.0kg, the conception rate is 76%, the average number of babies is 8.35, the weaning mortality rate is 10.3 1%, the daily gain is 50g, and the feed reward is 3.0∶ 1.
Series B: The whole body is white, the nose, ears and limbs are black, the adult weight is 4.9 kg, the conception rate is 80%, the average number of babies is 9.05, the weaning mortality rate is 10.96%, the daily gain is 50 grams, and the feed reward is 2.8∶ 1.
Series C: The whole body is white, the adult weight is 4.5 kg, the conception rate is 87%, the average number of births is 8.99, and the weaning mortality rate is 1 1.93%.
D line: the whole body is white, the adult weight is 4.5 kg, the conception rate is 8 1%, the average litter size is 9.33, and the weaning mortality rate is 8.08%.
The appearance of commercial substitute is California color, with weaning weight of 680g at 28 days, 2.25kg at 70 days, daily gain of 43g, feed reward of 2.7 ~ 2.9 ∶ 1, and slaughter rate of 58% ~ 59%. See table 1 for the production performance of series A and B, table 2 for the production performance of series C and D, and table 3 for the main performance of parents and commercial generations.
Table 1 IRA matching system A series and B series production performance table
Table 2 Production Performance Table of IRA Support Systems C and D
Table 3 main performance tables of IRA mating system parents and commercial generations