Yen J T, Pond W G
J Anim Sci. 1983 Mar;56(3):621-4. doi: 10.2527/jas1983.563621x.
Two experiments were conducted, involving 68 third-litter sows and 20 first-litter gilts in Exp. 1 and 82 first-litter gilts in Exp. 2. On d 108 of gestation, the dams were moved into individual crates, stratified by parity and breed, and randomly assigned within strata, to one of two treatments: (1) fed a basal 16% protein corn-soybean meal diet, 1.8 and 2.7 kg once daily before farrowing and for the first 7 d of lactation, respectively, and then ad libitum until pigs were weaned at 28 d of age, and (2) fed the basal diet plus 1 g of L-ascorbic acid (vitamin C)/dam daily from d 108 of gestation through d 7 of lactation and on the same feeding schedule as for treatment 1. In Exp. 1, no effect of vitamin C supplementation was observed in sows or gilts on total pigs born/litter, number of live pigs/litter or average live pig weight at birth, 7 or 28 d of age, or on plasma vitamin C concentration of dams at d 108 of gestation or d 7 of lactation or of pigs at birth, 7 or 28 d of age. However, there was a lower (P less than .01) plasma vitamin C concentration of the dams at d 7 of lactation than at d 108 of gestation. Plasma vitamin C concentration also declined (P less than .01) as pigs aged. In Exp. 2, with all gilts, vitamin C supplementation again showed no effect on any of the reproductive traits measured in Exp. 1. It is concluded that daily supplementation of 1 g of vitamin C to either sows or gilts from d 108 of gestation through d 7 of lactation has no beneficial effect on the reproductive or lactation performance of swine.
进行了两项试验，试验1涉及68头第三胎母猪和20头第一胎后备母猪，试验2涉及82头第一胎后备母猪。在妊娠第108天，将母猪转移到个体限位栏中，按胎次和品种分层，并在各层内随机分配到两种处理之一：（1）饲喂含16%蛋白质的基础玉米-豆粕日粮，在分娩前和泌乳的前7天分别每天饲喂1.8千克和2.7千克，然后自由采食直至仔猪在28日龄断奶；（2）从妊娠第108天至泌乳第7天，每天给每头母猪饲喂基础日粮加1克L-抗坏血酸（维生素C），饲喂时间表与处理1相同。在试验1中，补充维生素C对母猪或后备母猪的每窝总产仔数、每窝活仔数或出生、7日龄或28日龄时的平均活仔体重，以及妊娠第108天或泌乳第7天母猪的血浆维生素C浓度，或出生、7日龄或28日龄仔猪的血浆维生素C浓度均无影响。然而，泌乳第7天母猪的血浆维生素C浓度低于妊娠第108天（P<0.01）。随着仔猪日龄增加，血浆维生素C浓度也下降（P<0.01）。在试验2中，对于所有后备母猪，补充维生素C对试验1中所测的任何繁殖性状仍无影响。得出的结论是，从妊娠第108天至泌乳第7天，每天给母猪或后备母猪补充1克维生素C，对猪的繁殖性能或泌乳性能没有有益影响。
