One, weight and body type Studies have shown that postponing breeding to 130kg will have a significant impact on the number of litters in the first litter and will also increase the number of live births in subsequent parity. Second, mating age The relationship between the first-trimester-day-age and farrowing is not exactly the same, but there is sufficient evidence to show that 210-220d is the best. Third, back thick Physical condition, especially backfat, is a factor that shows the most appropriate condition for the initial deployment. It is recommended that the species should be bred at 18-22mm, with a minimum of 16mm. Fourth, the second estrus cycle breeding When the first estrus is waiting for breeding after 21 days, it is possible to increase the number of piglets per child by about two. If you wait until the third estrus cycle, you can increase the number of piglets per child, but it is not economically worthwhile. V. Feeding of gilts Aphrodisiac supplementation, increased energy intake 14 d before mating will potentially increase ovulation because of the effects of excitement. Increased to 3.5 to 3.75 kg/d 14 days before breeding and restricted feeding immediately after breeding. The feed protein for gestation should reach 16%, and 50 mg/kg of L-carnitine and 200 mg/kg of chromium in methylpyridine should be added to help shorten the estrus period of sows, increase the sow's delivery rate, and increase the life of two breeding cycles. Numbers. T Shape Black Light Blue Lamp, T5 Black Light Blue Lamp, T8 Black Light Blue Lamp, T9 Black Light Blue Lamp, T10 Black Light Blue Lamp Ningbo Sunfine UV lighting Co.,ltd. , http://www.uvlightings.com