Hepatic vitamin A concentrations in sheep in north-western Queensland by R. J. W. Gartner, D. C. Johnston.
The vitamin A concentrations were determined on livers taken from wether sheep one to five years old grazing Mitchell grass downs in north-western Queensland. animals slaughtered for rations at intervals of two weeks. mean value over a three-year period the 123 examined was 260.3 � SD 128.3 �g/g, which is considered normal ; no time values less than 48 �g/g. Subsequent results obtained further 199 young monthly between ages 15 64 concentration ranged 40.4 41.3 �g/g 29 weeks 265 -� 97.1 60 In adult there did not appear be any relationship and rainfall, whereas individual low coincided with extended periods rainfall. clinical deficiency could expected if length drought exceeds approximately seven months.
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