McConnell J C, Eargle J C, Waldorf R C
Dept. of Anim. Sci., Clemson University, SC 29634-0361.
J Anim Sci. 1987 Nov;65(5):1201-6. doi: 10.2527/jas1987.6551201x.
Four experiments involving 3- to 4-wk-old, ad libitum-fed weanling pigs (n = 809) were conducted to determine the effects of initial pig weight, co-mingling of litters, numbers of pigs/pen and room temperature on pig performance in a conventionally equipped nursery. Pigs that were largest at birth were largest (P less than .01) at weaning (r = .66) and also at 28 d postweaning (r = .62). Light-weight pigs (3.8 kg) at weaning gained more slowly (P less than .05) for 4 wk postweaning than heavy weight pigs (6.5 kg). Growth curves for the light and heavy groups of pigs remained parallel throughout the 4-wk nursery period, indicating that small pigs were not making compensatory gains. Growth rates of average-weight pigs (5.2 kg) were intermediate to and not different (P greater than .05) from light- and heavy-weight pigs. Penning 8, 16 or 24 pigs together while maintaining constant flooring area and feeder and waterer space/pig did not reduce (P greater than .05) intakes, gains or feed:gain ratios. Co-mingled litters grew comparably (P greater than .05) to pigs reared as littermates. In temperature studies, pigs were reared either in a room maintained at 29 +/- 2.8 C throughout the 28-d trials or at 29 +/- 2.8 C the first week postweaning and 24 +/- 2.8 C thereafter. Reducing the nursery temperature to 24 +/- 2.8 C after 1 wk depressed (P less than .05) intakes, gains and feed efficiencies as compared with the warmer temperature regimen.
进行了四项试验，涉及809头3至4周龄自由采食的断奶仔猪，以确定初始体重、混群、每栏猪数量和室温对传统设施保育舍中仔猪生产性能的影响。出生时体重最大的仔猪在断奶时（r = 0.66）以及断奶后28天（r = 0.62）也是最大的（P < 0.01）。断奶时体重轻的仔猪（3.8千克）在断奶后4周的生长速度比体重大的仔猪（6.5千克）慢（P < 0.05）。在整个4周的保育期内，轻、重两组仔猪的生长曲线保持平行，表明小猪没有进行补偿性生长。平均体重仔猪（5.2千克）的生长速度介于轻、重体重仔猪之间，且差异不显著（P > 0.05）。在保持每头猪的地面面积、采食和饮水空间不变的情况下，将8头、16头或24头猪饲养在一栏中，对采食量、增重或料重比没有影响（P > 0.05）。混群饲养的仔猪与同窝饲养的仔猪生长情况相似（P > 0.05）。在温度研究中，仔猪在整个28天试验期间饲养在温度保持在29±2.8℃的房间内，或者在断奶后第一周饲养在29±2.8℃的环境中，之后饲养在24±2.8℃的环境中。与温度较高的饲养方案相比，断奶1周后将保育温度降至24±2.8℃会降低采食量、增重和饲料效率（P < 0.05）。
