Kirkwood R N, Mitaru B N, Gooneratne A D, Blair R, Thacker P A
Department of Animal and Poultry Science, University of Saskatchewan, Saskatoon.
Can J Vet Res. 1988 Jan;52(1):134-6.
In an attempt to improve the reproductive performance of gilts mated at puberty, 70 Yorkshire x Landrace gilts were allocated at 120 d of age and 60 kg body weight to one of two treatments. Restricted gilts were fed 2.0 kg d-1 of a diet formulated to provide 18% crude protein and 14.5 MJ DE kg-1 from selection until mated at their first estrus (n = 35). Flushed gilts were fed 2.0 kg d-1 of the same diet from 120 to 150 d of age, but then had their feed intake increased to 3.5 kg d-1 until mated at their first estrus (n = 35). An additional group of gilts (control fed; n = 33) were fed 3.0 kg d-1 from selection until they were bred at their third estrus in order to investigate the influence of feed restriction on the onset of puberty. During gestation all gilts were fed 1.8 to 2.2 kg d-1 of a 16.8% crude protein diet having 13.7 MJ DE kg-1. Control fed gilts were younger (p less than 0.05) at puberty (150 d) than restricted (165 d) or flushed gilts (165 d). There was no difference in subsequent litter size between the restricted and flushed gilts (7.7 and 8.0, respectively). It is concluded that the institution of a flushing nutritional regime in the prepubertal period will not enhance piglet production from gilts mated at puberty.
为了提高初情期配种后备母猪的繁殖性能，70头约克夏×长白后备母猪在120日龄、体重60 kg时被分配到两种处理方式中的一种。限饲组后备母猪从选留至首次发情配种期间，饲喂2.0 kg/d的日粮，日粮配方为粗蛋白含量18%、消化能14.5 MJ/kg（n = 35）。催情补饲组后备母猪在120至150日龄时饲喂相同的日粮，2.0 kg/d，但随后采食量增加至3.5 kg/d，直至首次发情配种（n = 35）。另外一组后备母猪（对照饲喂组；n = 33）从选留开始饲喂3.0 kg/d，直到第三次发情配种，以研究限饲对初情期开始的影响。在妊娠期，所有后备母猪均饲喂1.8至2.2 kg/d的粗蛋白含量16.8%、消化能13.7 MJ/kg的日粮。对照饲喂组后备母猪初情期（150日龄）比限饲组（165日龄）和催情补饲组（1日龄）年轻（p < 0.05）。限饲组和催情补饲组随后的产仔数没有差异（分别为7.7头和8.0头）。得出的结论是，初情期前采用催情补饲营养方案不会提高初情期配种后备母猪的仔猪产量。
