The effect of light on broiler growth

Cherry, P.; Barwick, M. W.

doi:10.1080/00071666208415457

Cited by 48 publications

(34 citation statements)

References 9 publications

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“…Peripheral mono¬ deiodination of T4 to T3 has been demonstrated in the chicken (Borges, LaBourene & Ingbar, 1980;Scanes, Marsch, Decuypere & Rudas, 1983) and this process is stimulated by feeding (Sharp & Klandorf, 1984). The rhythmic variation in concentrations of plasma T3 observed in this study are consistent with the view that feeding, stimulated by the onset of a light period (Cherry & Barwick, 1962), results in an increase in the peripheral monodeiodination of T4 and consequently, an increase in levels of plasma T3. Conversely, when feeding stops at the onset of darkness, peripheral monodeiodination of T4 decreases and levels of plasma T3 decrease.…”

Section: Discussionsupporting

confidence: 89%

“…Chickens transferred to constant darkness from a 24-h light-darkness cycle continue to feed although, initially, at a reduced rate (Cherry & Barwick, 1962). Again, a tendency towards continuous feeding in the dark may have caused a reduction in the amplitudes of the rhythms in levels of plasma T3 and T4.…”

Section: Discussionmentioning

confidence: 97%

“…Broiler hens are known to feed in darkness when the daylength is less than about 6 h (Cherry & Barwick, 1962). It is possible that the fall in T4 levels after refeeding is due to an inhibitory effect of increasing levels of plasma T3 on an unidentified component of the hypothalamo-pituitary-thyroid axis (Sharp & Klandorf, 1984).…”

Section: Discussionmentioning

confidence: 98%

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Influence of lighting cycles on daily rhythms in concentrations of plasma tri-iodothyronine and thyroxine in intact and pinealectomized immature broiler hens (Gallus domesticus)

Sharp¹,

Klandorf²,

Lea³

1984

Journal of Endocrinology

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The effects of pinealectomy on the daily rhythms of concentrations of tri-iodothyronine (T3) and thyroxine (T4) were investigated in sexually immature female chickens exposed to 21-, 24- and 27-h cycles of light and darkness, or to extended periods of light or darkness for more than 24 h. In pinealectomized and control birds, rhythms in levels of plasma T3 and T4 were entrained by all lighting cycles and decreased in amplitude or disappeared in continuous light or darkness. In pinealectomized and control birds held on 21-h (11 h light:10 h darkness; 11L:10D) and 24-h (14L:10D) lighting cycles, the peak of the T4 rhythm coincided with, or lagged, the trough in the rhythm of T3 while in birds held on a 27-h (14L:13D) lighting cycle, the peak of the T4 rhythm preceded the trough in the rhythm of T3. Pinealectomy resulted in significant effects on the phases or amplitudes of rhythms of T3 or T4 in all lighting schedules except 4L:20D. However, these effects were not consistent in direction between experimental groups and were, therefore, of doubtful physiological significance. Pinealectomy increased the mean level of plasma T4 in birds exposed to continuous light or darkness or to 4L:20D. A corresponding reduction in mean levels of plasma T3 was seen in birds exposed to continuous light or darkness. It is concluded that under the lighting conditions investigated pinealectomy had no clear effect on the phases or amplitude of daily rhythms of levels of T4 or T3. However, after the effects of the feeding pattern on thyroid hormone rhythms imposed by the lighting cycle were removed by placing birds in constant lighting conditions, pinealectomy appeared to exert an inhibitory action on thyroid function.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 97%

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Influence of lighting cycles on daily rhythms in concentrations of plasma tri-iodothyronine and thyroxine in intact and pinealectomized immature broiler hens (Gallus domesticus)

Sharp¹,

Klandorf²,

Lea³

1984

Journal of Endocrinology

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“…High light intensity (64·8 lux) reduces growth rate in broilers (Barrott and Pringle, 1951). Cherry and Barwick (1962) stated that light intensities above 10·8 lux probably depress growth. Siopes et al (1983), studying light intensity effect on the growth and development of turkey males, suggested that low light intensity (1 lux) resulted in inferior growth performance, whereas 11 lux was sufficient to enable growth performance similar to that obtained with high light intensity (110 and 220 lux).…”

Section: Introductionmentioning

confidence: 99%

The effect of light intensity on growth and development of turkey toms

Yahav

Hurwitz²,

Rozenboim³

2000

British Poultry Science

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1. The effect of light intensities from 10 to 700 lux on the performance of 5 to 18 week-old turkey males was studied in 2 trials. 2. Body weight of 18 week-old turkeys, in both experiments, was highest under the lowest light intensity This coincided with higher weight gain and lower food intake, which resulted in significantly better food conversion efficiency 3. Light intensity affected heart muscle weight but not weight of breast muscle, abdominal fat or testis as proportions of body weight. 4. The decline in plasma T3 concentration with age differed from other treatments at the low light intensity, which resulted in a significantly higher T3 concentration in turkeys exposed to 10 lux at the age of 10 to 15 weeks. 5. It is concluded that light intensity significantly affects food conversion efficiency in turkey males. This is likely to be related to differential investment of energy expenditure for maintenance.

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“…Cherry and Barwick (1962) found no difference in body weight or food consumption of broiler chicks at 4, 6, 8 or 10 weeks when kept under white or red light of varying intensity, although Hammond and Titus (1941) found there was a tendency to greater weight gain under red light. The improvement was consistent but not statistically significant.…”

Section: Exploratory Studiesmentioning

confidence: 84%

A chick growth test for the evaluation of protein quality in cereal‐based diets

Aa¹

1968

British Poultry Science

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A chick growth test of the protein efficiency ratio (PER) type has been developed in which chicks previously fed a normal starting diet containing 21 per cent protein are given, from 14 to 28 days of age, diets containing 18.5 per cent protein of which 12 per cent is provided by the test supplement and the remainder by cereals with the inclusion of a small quantity of yeast. The total protein efficiency (TPE) of the test supplement is calculated as the weight gain of the chicks divided by the total weight of the protein (supplement, cereals and yeast) eaten by the chicks.The method is flexible and the diets used allow the testing of supplements varying in crude protein content from 20 to 100 per cent. Reproducibility of results and discrimination between samples is good. The method is particularly adapted to examining the supplementary values of proteins whose inability to support satisfactory growth unaided precludes their evaluation by a normal PER procedure.Exploratory experiments to study the influence of various factors upon performance are described.

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The effect of light on broiler growth

Cited by 48 publications

References 9 publications

Influence of lighting cycles on daily rhythms in concentrations of plasma tri-iodothyronine and thyroxine in intact and pinealectomized immature broiler hens (Gallus domesticus)

Influence of lighting cycles on daily rhythms in concentrations of plasma tri-iodothyronine and thyroxine in intact and pinealectomized immature broiler hens (Gallus domesticus)

The effect of light intensity on growth and development of turkey toms

A chick growth test for the evaluation of protein quality in cereal‐based diets

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