Effects of Increasing, Decreasing, and Constant Lighting Treatments on Growing Pullets

King, D. F.

doi:10.3382/ps.0400479

Cited by 41 publications

(15 citation statements)

References 10 publications

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“…Experiments published by King (1961), Morris (1967) and an unpublished trial for which data are given in Lewis et al (1998) found differences of 5·0, 12·6, and 11·5 d respectively between groups reared on 6 h and 10 h photoperiods, compared with the difference of 22·5 d observed in the present trial between 7 h and 10 h treatments. It is difficult to see any likely explanation for this divergence, other than genetic differences in sensitivity to short photoperiods.…”

Section: Discussioncontrasting

confidence: 63%

The influence of pelleted feed on the response of growing pullets to photoperiods of less than ten hours

Gous¹,

Morris²

2001

British Poultry Science

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1. An experiment was designed to test the hypothesis that delayed sexual maturity in pullets reared on very short (4 h) constant photoperiods might be partly attributable to limitation of food intake and that offering a pelleted feed might circumvent this effect. 2. The factors investigated were 2 strains (Amber Link and Hyline Brown), 3 photoperiods (4, 7 and 10 h) and 2 forms of food (mash throughout rearing or crumbs from 0 to 4 weeks followed by pellets). All 12 combinations of these factors were tested with 14 replications of 18 pullet chicks allocated to each combination. 3. Mean ages at first egg for 4, 7 and 10 h rearing photoperiods were 189, 184 and 162 d respectively. Pullets given the pelleted diet ate 2% less food to 20 weeks but were 6% heavier at that age. However, the pellet-fed birds were 6 d later in mean age at 50% lay. There was no interaction between form of food and photoperiod in the data for age at first egg. 4. It is concluded that constant short photoperiods during rearing cause delayed sexual maturity entirely due to the effect of light on gonadal development and that limitation of food intake is not a factor in this response.

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Section: Discussioncontrasting

confidence: 63%

The influence of pelleted feed on the response of growing pullets to photoperiods of less than ten hours

Gous¹,

Morris²

2001

British Poultry Science

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“…Already after the first week the increased consumption in the lighted pens amounted to as much as 10%, and at times almost one-third of the total feed intake was consumed during the period of artificial illumination. This phenomenon has been described for DLR by Morris and Fox (I960), Noles and Smith (1964) and Lillie and Denton (1965), and for various schedules of constant lighting by King (1961). It can be assumed that this effect is due to light supplementation per se, rather than being the specific result of DLR.…”

Section: Experimental and Resultsmentioning

confidence: 90%

Studies with Decreasing Lighting Regimes for Early-Season Replacement Pullets under Subtropical Conditions

Bornstein

Lev

1969

Poultry Science

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“…They also noted that up to that time, artificial lighting had not been widely adopted by the industry and egg supply was seasonal in the UK. King (1959King ( , 1961 pointed out that much of the earlier work on lighting patterns had been done by supplementation of natural day length with additional lighting and by using natural lighting as the control. By using techniques of complete light control for all treatments, he demonstrated the value of a declining or constant short day length during rearing, followed by increasing day length during lay.…”

Section: Introductionmentioning

confidence: 99%

Responses of modern hybrid laying stocks to changes in photoperiod

Charles¹,

Tucker²

1993

British Poultry Science

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Two replicates of each of 4 light patterns were imposed on 4 breeds of laying hen. The light patterns were designed to induce sexual maturity, defined as 50% production, at a range of ages. Within-room treatments were ad libitum or rationed feeding during rearing and 4 breeds, namely ISA Brown, Hisex Brown, Ross G-Link Brown and Shaver Brown. A total of 6144 birds were used to test the 32 treatments. 2. Age at 50% production was significantly affected by both lighting treatment and rearing regimen. 3. The light pattern treatments had no significant effect on any cumulative performance variable measured from 20 to 80 weeks of age. 4. Breed had a significant effect on eggs/hen housed, rate of lay, egg weight, egg output and food intake.

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Effects of Increasing, Decreasing, and Constant Lighting Treatments on Growing Pullets

Cited by 41 publications

References 10 publications

The influence of pelleted feed on the response of growing pullets to photoperiods of less than ten hours

The influence of pelleted feed on the response of growing pullets to photoperiods of less than ten hours

Studies with Decreasing Lighting Regimes for Early-Season Replacement Pullets under Subtropical Conditions

Responses of modern hybrid laying stocks to changes in photoperiod

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