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Vitamin A requirements of alipochromatic (‘recessive‐white’) and coloured canaries ( Serinus canaria ) during the breeding season
Author(s) -
Preuss S. E.,
Bartels T.,
Schmidt V.,
KrautwaldJunghanns ME.
Publication year - 2007
Publication title -
veterinary record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.261
H-Index - 99
eISSN - 2042-7670
pISSN - 0042-4900
DOI - 10.1136/vr.160.1.14
Subject(s) - hatchling , white (mutation) , biology , moulting , vitamin a deficiency , seasonal breeder , vitamin , zoology , veterinary medicine , retinol , medicine , genetics , endocrinology , ecology , gene , larva , hatching
Six pairs of alipochromatic (‘recessive‐white’) canaries ( Serinus canaria ) and six pairs of coloured canaries were kept through a complete breeding cycle while being fed a diet providing 12,000 iu vitamin A/kg. The eggs of three pairs (one recessive‐white and two coloured) were all unfertilised and there were only 23 hatchlings (14 recessive‐white and nine coloured), of which 14 (10 recessive‐white and four coloured) were alive after the first moult. However, there was no clinical, biochemical or pathological evidence that the recessive‐white canaries were suffering from vitamin A deficiency or that the coloured canaries were suffering from vitamin A toxicity, suggesting that the diet met the vitamin A requirements of both groups.