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Delayed hatching time of chicks from dams fed excess vitamin A and from eggs injected with vitamin A.

B. March,V. Coates,C. Goudie

Published 1972 in Poultry Science

ABSTRACT

Abstract A high level of vitamin A fed to laying chickens depressed the rate of egg production, egg size and hatchability. Average incubation time of chicks was prolonged when the dams were fed 210,000 I.U. of vitamin per kg. of diet. After feeding this level of vitamin A for 11 months eggs laid contained an average of 2,080 I.U. of vitamin A. Eggs laid by control birds receiving 10,000 I.U. of vitamin A per kg. of diet contained an average of 370 I.U. of vitamin A. Vitamin A alcohol, injected into eggs prior to incubation at a level of 1,070 I.U. per egg, depressed hatchability markedly, whereas injection of 8,000 I.U. of vitamin A palmitate had little effect. Developmental abnormalities were noted in a number of dead embryos from vitamin A-injected eggs and haemorrhaging appeared to be a frequent cause of embryonic death. Injection of either form of the vitamin prolonged incubation time.

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