Reproductive performance of dwarf broiler breeders given different allowances of food during the rearing and breeding periods and two lighting patterns.
1. Dwarf broiler breeders were either fed ad libitum or restricted to allow growth to mean body weights of 1.4 or 1.8 kg at 20 weeks of age. During the breeding period these birds were fed ad libitum, or food was restricted to different degrees and the birds subjected to two different incremental lighting patterns. 2. Egg production of birds fed ad libitum during the breeding period increased with the degree of food restriction during rearing. 3. Food restriction during the breeding period increased the egg production of birds weighing 1.8 kg at 20 weeks but decreased that of birds weighing only 1.4 kg. 4. Fertility was relatively low and inversely related to body fatness of females. 5. The differences in lighting pattern did not influence performance. 6. For optimum reproductive performance during the rearing period dwarfs should not be restricted so severely as conventional breeders. Best chick production was obtained from birds with a bodyweight of 1.8 kg at 20 weeks of age, which were subjected to a 10% restriction of food during the breeding period.
Whitehead
C C
CC
Agricultural and Food Research Council's Poultry Research Centre, Roslin, Midlothian, Scotland.
Herron
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KM
Waddington
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D
D000367:Age Factors; D000818:Animals; D001835:Body Weight; D002645:Chickens / Q000502:physiology*; D004435:Eating; D005260:Female; D005298:Fertility; D005508:Food Deprivation / Q000502:physiology*; D008027:Light; D008297:Male; D010058:Oviposition; D010507:Periodicity