Publication of research result: The reproductive performance of the GF24 sows mated with the GF337, GF280, and GF399 boar lines and pork productivity of the offspring raised in the Central Vietnam

1. The thesis has researched and provided new information, data set on reproductive physiological characteristics and reproductive performance of the GF24 sows in industrial pig production system in Central Vietnam: GF24 sows matured in early sexuality (175 days). The oestrous cycle was 21.6 days. The oestrous duration lasted for 7.4 days. The duration from first signals of oestrus till standing heat was 66.8 hours. The standing heat duration lasted for 54.4 hours. Age at first oestrus, first service and first farrowing were 157.1, 229.8 and 353.7 days, respectively. The GF24 sows had high reproductive performance when mated with the GF337, GF280 and GF399 boar lines, with 28.43-29.05 piglets weaned/sow/year and 171.78-172.85 kg weaned piglets/sow/year.
 

2. The thesis has researched and provided new information and data on the meat production capacity of 03 crossbred pigs between the GF24 sows and the GF337, GF280, GF399 boar lines in industrial pig production system in both opened and closed barns. The thesis found that, in both two conditions, in the period of 60-150 days of age, 03 crossbreds had high growth capacity (794-873 g/ day), low feed conversion ratio (2.50-2.76 kg feed/ kg weight gain), high meat productivity (the dressing percentage reached 71-73%, lean percentage reached 59.7-64.4 %) and good meat quality. Among 03 crossbreds, GF337xGF24 was the most dominant in terms of growth, GF399xGF24 had the most advantage in feed conversion efficiency and lean meat ratio, GF280xGF24 had the most advantage in intramuscular fat in the loin (2.00-2.32%).

3. The thesis also researched and provided new information and data on the meat production capacity of two GF337xGF24 and GF399xGF24 crossbred pigs at different slaughter weights (100, 110 and 120 kg). The results showed that, increasing the slaughter weight of the two above crossbreds from 100 to 120 kg had a positive impact on average weight gain, meat color and economic efficiency in production without affecting carcass percentage as well as other meat yield and quality traits, except that lean percentage tends to decrease and backfat thickness tends to increase.