title: Effect of early feed withdrawal on subsequent laying hen performance.
abstract: Two experiments evaluated the effects of short periods of feed withdrawal early in production on subsequent performance of laying hens. Laying hens of the H&N strain (22 or 20 wk of age) were full fed (control) or deprived of feed for 4 or 7 days when they reached 10% production. Egg production was evaluated for 45 wk, but other performance data were collected for 32 wk because no treatment differences existed beyond that point. Feed withdrawal for 4 and 7 days caused BW losses of 14 and 20%, respectively. In Experiment 1 (winter), BW at 2-wk postwithdrawal for hens that did not eat for 7 days were reduced (P < or = .05) compared with controls or hens that did not eat for 4 days. However, in Experiment 2 (summer), BW of hens deprived of feed for 4 or 7 days were lower (P < or = .05) than those of controls. Average early egg weight (Weeks 1 to 6) was not different among treatments in both experiments. The only observed effect of treatment on long-term egg weight was that egg weight for 7-day hens was greater (P < or = .05) than for controls in Experiment 2. Early hen-day egg production was depressed by 4- or 7-day feed withdrawal, but long-term production was not different between control and 4-day hens in both experiments. However, hen-housed production was lower (P < or = .05) for 4-day hens compared with controls in Experiment 2. Fewer (P < or = .05) eggs were produced by 7-day hens versus controls in both experiments.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Animal Sciences, University of Illinois at Urbana-Champaign 61801.
authors.forename: K W
authors.initials: KW
authors.lastname: Koelkebeck
authors.forename: C M
authors.initials: CM
authors.lastname: Parsons
authors.forename: R W
authors.initials: RW
authors.lastname: Leeper
mesh_terms: D000821:Animal Feed; D000818:Animals; D001835:Body Weight; D002645:Chickens; D004531:Eggs; D005260:Female; D005508:Food Deprivation; D010058:Oviposition / Q000502:physiology*; D012621:Seasons; D013997:Time Factors