Pluske J R, Williams I H, Zak L J, Clowes E J, Cegielski A C, Aherne F X
Department of Agricultural, Food and Nutritional Sciences, University of Alberta, Edmonton, Canada.
J Anim Sci. 1998 Apr;76(4):1165-71. doi: 10.2527/1998.7641165x.
First-litter sows fitted with stomach cannulas were used to test the hypothesis that making gilts anabolic during lactation by providing them with extra nutrition would increase milk production and pig growth. Gilts were allocated to one of three dietary treatments after farrowing: 1) restricted, sows were fed 50% of their estimated ad libitum intake; 2) ad libitum, sows were encouraged to eat as much feed as possible; and 3) superalimented, sows were infused seven times daily through their cannula to achieve a 25 to 30% increase in energy intake in excess of that achieved by sows fed on an ad libitum basis. Milk production was estimated in mid- (d 10 to 15) and late (d 21 to 25) lactation by a modification of the isotope dilution technique. Milk production was similar between treatments in mid- and late lactation (P > .05), and this was reflected in a similarity in weaning litter weight (P = .238). Milk composition was similar also (P > .05) between dietary treatments. Superalimentation provided gilts with 38% more energy (P < .001) than gilts fed on an ad libitum basis, and they accrued live weight (5.1 kg) and backfat (1.8 mm) during lactation (P < .001). These data provide evidence that, unlike multiparous sows that show an increase in milk yield when made anabolic during lactation, primiparous sows seem to partition extra energy into body growth rather than into milk production.
在哺乳期为后备母猪提供额外营养使其合成代谢，会增加产奶量和仔猪生长。分娩后，将后备母猪分配到三种日粮处理之一：1）限饲，母猪饲喂量为其估计自由采食量的50%；2）自由采食，鼓励母猪尽可能多吃饲料；3）超量饲喂，通过胃瘘管每天给母猪输注7次，使能量摄入量比自由采食的母猪增加25%至30%。在泌乳中期（第10至15天）和后期（第21至25天），采用改良的同位素稀释技术估计产奶量。泌乳中期和后期各处理间产奶量相似（P>.05），断奶仔猪体重相似也反映了这一点（P =.238）。日粮处理间的乳成分也相似（P>.05）。超量饲喂比自由采食的后备母猪多提供38%的能量（P<.001），且它们在泌乳期体重增加（5.1千克）、背膘厚增加（1.8毫米）（P<.001）。这些数据表明，与经产母猪在泌乳期合成代谢时产奶量增加不同，初产母猪似乎将额外能量用于体生长而非产奶。
