Rhodes M T, Davis D L, Stevenson J S
Dept. of Anim. Sci. and Ind., Kansas State University, Manhattan 66506-0201.
J Anim Sci. 1991 Jan;69(1):34-40. doi: 10.2527/1991.69134x.
Gilts (n = 267) were allotted to flushing (1.55 kg/d additional grain sorghum), altrenogest (15 mg.gilt-1.d-1) and control treatments in a 2 x 2 factorial arrangement. Altrenogest was fed for 14 d. Flushing began on d 9 of the altrenogest treatment and continued until first observed estrus; 209 gilts (78%) were detected in estrus. The interval from the last day of altrenogest feeding to estrus was shorter (P less than .05) with the altrenogest + flushing treatment (6.6 +/- .2 d) than with flushing alone (7.6 + .3 d). Ovulation rates (no. of corpora lutea) were higher (P less than .05) in all flushed gilts (14.5 +/- .4 vs 13.4 +/- .4), whether or not they received altrenogest. Flushing also increased the total number of pigs farrowed (.9 pigs/litter; P = .06) and total litter weight (1.43 kg/litter; P = .01), independent of altrenogest treatment. Number of pigs born alive and weight of live pigs were higher for gilts treated with altrenogest + flushing and inseminated at their pubertal estrus than for gilts in all other treatment combinations. In contrast, gilts receiving only altrenogest had greater live litter weight and more live pigs born when inseminated at a postpubertal estrus than when inseminated at pubertal estrus. We conclude that flushing increased litter size and litter weight, particularly for gilts that were inseminated at their pubertal estrus. Increased litter size resulted from increased ovulation rates, which, in nonflushed gilts, limited litter size at first farrowing.
267头后备母猪按2×2析因设计分为催情补饲组（额外添加1.55千克/天的高粱谷物）、烯丙孕素组（15毫克/头·天）和对照组。烯丙孕素饲喂14天。催情补饲在烯丙孕素处理的第9天开始，持续至首次观察到发情；209头后备母猪（78%）发情。烯丙孕素+催情补饲处理组从烯丙孕素饲喂最后一天至发情的间隔时间（6.6±0.2天）比单独催情补饲组（7.6±0.3天）短（P<0.05）。所有催情补饲的后备母猪排卵率（黄体数）更高（P<0.05）（14.5±0.4对13.4±0.4），无论是否接受烯丙孕素处理。催情补饲还增加了产仔总数（0.9头/窝；P=0.06）和总窝重（1.43千克/窝；P=0.01），与烯丙孕素处理无关。与所有其他处理组合的后备母猪相比，在初情期发情时接受烯丙孕素+催情补饲并进行人工授精的后备母猪产活仔数和活仔猪体重更高。相比之下，仅接受烯丙孕素处理的后备母猪在初情期后发情时进行人工授精比在初情期发情时进行人工授精有更大的活窝重和更多的产活仔数。我们得出结论，催情补饲增加了窝产仔数和窝重，特别是对于在初情期发情时进行人工授精的后备母猪。窝产仔数增加是由于排卵率提高，在未催情补饲的后备母猪中，首次产仔时窝产仔数受限。
