The Effect of Length of Daily Light Periods on Reproduction in Female Chickens
1963; Elsevier BV; Volume: 42; Issue: 5 Linguagem: Inglês
10.3382/ps.0421161
ISSN1525-3171
AutoresW.H. McCluskey, Jill E. Parker,
Tópico(s)Rabbits: Nutrition, Reproduction, Health
ResumoALTHOUGH numerous studies concerned with photoperiodism on the sexual development of female chickens have been reported, most of them have involved Leghorn type birds and have been limited to the influence of lights during the rearing period. Also, most studies have limited light restriction to 6 or 8 hours although Rider (1938) and King (1961, 1962) reported pullets reared in darkness would come into egg production. Parker and McCluskey (1961) reported onset of semen production in cockerels on as little as a 1 hour single light period per day. This study involved heavy breed pullets reared and maintained on light periods as short as 1 hour per day. Chicks used in this experiment consisted of 21 Delaware pullets per treatment hatched November 11, 1961, from a flock maintained at the Oregon Agricultural Experiment Station. They were reared from time of hatch on 1, 3, 9 and 13…
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