Koelkebeck K W, Parsons C M, Leeper R W, Moshtaghian J
Department of Animal Sciences, University of Illinois, Urbana-Champaign 61801.
Poult Sci. 1992 Mar;71(3):434-9. doi: 10.3382/ps.0710434.
Two experiments were conducted to examine the effects of varying length of feed withdrawal on postmolt laying hen performance. Commercial laying hens (65 wk of age) were fed continuously or fasted for 4 or 10 days in Experiment 1 and fed continuously or fasted for 4, 7, or 14 days in Experiment 2. Egg production performance was evaluated for 35 wk of production following initiation of fasting. Hen-day egg production (Weeks 1 to 35) and egg weight (Weeks 5 to 35) did not differ between treatments in Experiment 1; however, in Experiment 2, egg production was depressed for the 14-day fasted hens compared with the fed hens. Lower egg weight also occurred for the 14-day fasted hens compared with the fed, 4-, or 7-day fasted hens in Experiment 2. Egg yield (grams of egg per hen per day) for Weeks 5 to 35 was lower for fed hens versus the 4- or 10-day fasted groups in Experiment 1, but no treatment differences occurred in Experiment 2. Feed efficiency (grams of egg per gram of feed) for Weeks 5 to 13 was not affected by length of fasting in Experiment 1, but feed efficiency of hens fasted for 14 days was lower (P less than .05) than that of hens on other treatments in Experiment 2. Egg specific gravity was highest for hens fasted for 10 or 14 days and was lowest for fed hens, with egg specific gravity for hens fasted for 4 or 7 days being intermediate (P less than or equal to .05). The results indicated that fasting periods of less than 10 days may yield satisfactory egg production and egg weight but that eggshell quality may be enhanced by using fasting periods of 10 days or longer.
进行了两项试验，以研究不同停喂时长对换羽后蛋鸡生产性能的影响。在试验1中，将商品蛋鸡（65周龄）连续饲喂或禁食4天或10天；在试验2中，将蛋鸡连续饲喂或禁食4天、7天或14天。禁食开始后，对产蛋性能进行了35周的评估。试验1中各处理间的母鸡日产蛋量（第1至35周）和蛋重（第5至35周）没有差异；然而，在试验2中，与饲喂的母鸡相比，禁食14天的母鸡产蛋量下降。试验2中，与饲喂的母鸡、禁食4天或7天的母鸡相比，禁食14天的母鸡蛋重也较低。试验1中，第5至35周的产蛋量（每只母鸡每天产蛋克数），饲喂的母鸡低于禁食4天或10天的组，但试验2中各处理间没有差异。试验1中，第5至13周的饲料效率（每克饲料产蛋克数）不受禁食时长的影响，但试验2中，禁食14天的母鸡的饲料效率低于其他处理的母鸡（P小于0.05）。禁食10天或14天的母鸡的蛋比重最高，饲喂的母鸡的蛋比重最低，禁食4天或7天的母鸡的蛋比重居中（P小于或等于0.05）。结果表明，禁食期少于10天可能会产生令人满意的产蛋量和蛋重，但使用10天或更长的禁食期可能会提高蛋壳质量。
