Effects of Background Illumination and Light-Dark Period on Weight Gain in Broilers

Influence of Light on the Metabolism of 14 C Labelled Valine in Male and Female Broilers

“…No significant differences were observed in body weight, feed intake, or feed conversion between the control and treated groups, which does not agree with the work of earlier investigators (King, 1961;Gore et al, 1969;Skoglund et al, 1964). However, the present experiments with birds injected with labelled valine, show that a photoperiod of 24 hours a day alters the metabolism of the amino acids.…”

“…D IFFERENT authors have demonstrated a relationship between body weight and exposure to light in birds (Clegg and Sanford, 1951;Moore, 1957;King, 1961;Skoglund and Palmer, 1961;Gore et al, 1969;Deaton and Reece, 1970). The mechanism responsible for the biological effect of light is not clear.…”

Effects of Continuous and Intermittent Light on Broilers Cold Stressed as Embryos

“…(7) have shown that meat-type chickens exposed to continuous light are heavier at broiler age than those given periods of light and darkness. Nevertheless, Barott and Pringle (1), Clegg and Sanford (4), Moore (8), and Gote et al (5) For personal use only. Cold stressing embryos for 10 and 12 hr significantly ({ < 0'05) increased l-to 8-week moriality (Table 3).…”

Diurnal Activity Patterns of Broilers in a Controlled Environment

“…Previous studies (Gore et al, 1969;Centa et al, 1969) had led the experimenters to predict that the weight gains would be ordered with the "10 minutes on-70 minutes off" group heaviest, "IS minutes on-45 minutes off" group intermediate, and the "continuous" group lightest. If one uses the Mann-Whitney U test (Mosteller and Bush, 1954) to evaluate these results, this order is significant for the males, but no difference exists for females.…”

“…Previous studies (Moore, 1957;Centa et al, 1969;Gore et al, 1969) have indicated that manipulation of background illumination and alternating periods of light and dark may effectively alter activity patterns and growth rates.…”