Reproductive Performance of Force-Molted Turkey Breeder Hens

Leighton, A. T.; Krey, H. P. Van; Moyer, D. D.; Pötter, Luciana

doi:10.3382/ps.0500119

Cited by 18 publications

(7 citation statements)

References 4 publications

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“…First cycle hens came into egg production and peaked at the third week, a rate comparable to that observed in commercial flocks by Leighton et al (1971). However, a sharp decline in production occurred immediately after this egg production peak and was followed by a gradual decline for the remainder of the egg production period.…”

Section: Resultsmentioning

confidence: 67%

Effect of Body Weight Loss During a Molt on Second Cycle Reproductive Performance of Turkey Hens ,

1986

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One hundred Medium White turkey hens were randomly placed in cages, photostimulated, and provided a breeder diet and water ad libitum. Once egg production began, eggs were collected daily for 19 weeks. When the first egg laying cycle was completed, 95 hens were moved to floor pens and molted to observe the effects of different body weight losses during the molt on the second egg production cycle. Hens were randomly distributed between replicate pens of two treatment groups and exposed to 24 hr of light per day for 7 days. The photoperiod was then reduced to 6 hr for the remainder of the molt. Water was removed for 3 days and feed was removed for 7 and 18 days, respectively, until a reduction in body weight of 10% for the first Treatment (TRT 1) or 20% for the second treatment (TRT 2) was reached. Upon reaching desired body weight loss, hens were fed a holder diet for 5 weeks, then a prebreeder diet for 2 weeks. All hens were then randomly placed in cages, fed a breeder diet ad libitum, and subjected to a 14-hr/day photoperiod for a 20-week laying cycle. Packed cell volume increased during water deprivation during the molt. Body weights were not different at lighting for the second cycle.Production was signifcantly higher for birds with lower weight loss. Percent hen-housed egg production and total eggs per hen-housed bird were significantly (P< .01) greater in TRT 1 than TRT 2. Percent hen-housed egg production and total eggs per hen-housed bird were significantly (P<.01) greater in the second cycle than in the first cycle. (

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Section: Resultsmentioning

confidence: 67%

Effect of Body Weight Loss During a Molt on Second Cycle Reproductive Performance of Turkey Hens ,

1986

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“…Leighton et al (1971) showed that first-and secondcycle, egg-production levels were equivalent for Medium White turkeys. But with Large White hens, a reduction of about seven eggs per hen occurred during the second cycle when the hens were exposed to incandescent light.…”

Section: Discussionmentioning

confidence: 96%

Effect of Intermittent Lighting on the Reproductive Performance of First-Year and Recycled Turkey Hens ,

Siopes

Pyrzak

1990

Poultry Science

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In each of two trials, a 2-by-2 factorial arrangement of treatments was utilized to evaluate the reproductive performance of first-year and recycled turkey hens to intermittent lighting (IL) through an egg-laying period of 20 wk. The IL treatment provided 4 h of light per day given as 2 h light:12 h dark:2 h light:8 h dark (2L:12D:2L:8D). This treatment group was compared to controls maintained on 16L:8D. Data were collected for BW, feed intake, feed efficiency, time to first egg, eggs per hen fertility, hatchability, egg weight, and poult weight. Consistent age effects included greater BW, egg weight, and poult weight from recycled hens compared to first-year hens as well as a delay in the onset of laying and a reduction in egg production by six eggs per hen in the recycled hens. Feed intake and feed efficiency were similar in both age groups, Intermittent lighting delayed the onset of laying but increased the rate of lay by eight eggs per hen. Late-season fertility, feed efficiency, and egg weight were significantly increased by the IL treatment. The conclusion was that, for turkey hens, intermittent lighting can effectively improve reproductive performance.

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“…There are indications that as little as 1 h and as much as 10 h light/day was sufficient to terminate photorefractoriness (Harper and Parker, 1957, 1960Wilson et al, 1962;Leighton et al, 1971). The duration of these ' treatments was reported to be as little as 1 wk to as much as 23 wk, and the results were highly variable.…”

Section: Introductionmentioning

confidence: 88%

Prelay Light Restriction of Turkey Hens: Daylength Versus Exposure Time ,

Siopes

1989

Poultry Science

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A 3 x 3 factorial experimental design was used to examine the relationship between the duration of short daylength (10, 8, or 4 h light/day) during prelay light restriction and the length of time (12, 8, or 6 wk) that young turkey hens were exposed to light restriction and subsequent photoinduced reproductive performance. Data were collected for time to first egg, egg production, percentage of fertility, and hatchability, and poult weight. Light restrictions consisting of 10, 8, or 4 h light/day were equally effective in terminating photorefractoriness and preparing hens for subsequent photoinduced reproductive performance. A 6-wk exposure to light restriction did not prepare hens for egg laying as effectively as 8 (P less than .05) or 12 (P less than .10) wk of exposure, both of which were similarly effective. A lack of interaction between the light restriction daylength and exposure time suggests that the requirements for effective light restriction are rather specific and cannot be beneficially manipulated by various combinations of daylength and weeks of exposure.

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Reproductive Performance of Force-Molted Turkey Breeder Hens

Cited by 18 publications

References 4 publications

Effect of Body Weight Loss During a Molt on Second Cycle Reproductive Performance of Turkey Hens ,

Effect of Body Weight Loss During a Molt on Second Cycle Reproductive Performance of Turkey Hens ,

Effect of Intermittent Lighting on the Reproductive Performance of First-Year and Recycled Turkey Hens ,

Prelay Light Restriction of Turkey Hens: Daylength Versus Exposure Time ,

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