Effectiveness of twenty-five-hydroxycholecalciferol in the prevention of XXXX in Ross cockerels depends on dietary @entity460 level.

@entity3875 @entity14282 @entity460 @entity3151 @entity6446 @entity14951
Five experiments were conducted to evaluate the efficacy of @entity14951 [ @entity14282 ] to minimize the development of @entity6446 ( @entity6446 ) and improve phytate @entity3151 retention in Ross cockerels during the starter period. In experiment 1, chicks were fed a @entity6446 -inducing (0.67% @entity460 ) diet with or without exposure to ultraviolet light and no supplemental @entity3875 . Dietary @entity14282 was added at 0, 10, or 70 microg/kg for both light treatments. In experiment 2, @entity14282 was added at 0, 10, 40, or 70 microg/kg to a @entity6446 -inducing diet containing 27.5 microg/kg added @entity3875 . Experiment 3 was similar to experiment 2 except a diet marginal (0.85%) in @entity460 was fed, and @entity3875 was added at 55 microg/kg. In experiments 4 and 5, @entity14282 was added at 0, 18, 36, 54, 72, or 90 microg/kg to a diet marginal in @entity460 . Dietary @entity14282 decreased the incidence of @entity6446 similarly at 40 and 70 microg/kg @entity14282 and improved phytate @entity3151 retention when the @entity6446 -inducing diet was fed. The incidence of @entity6446 was decreased when 70 microg/kg @entity14282 was added to a diet marginal in @entity460 in experiment 3 only. Phytate @entity3151 retention was generally not affected by dietary @entity14282 when a diet containing marginal @entity460 , adequate @entity3151 , and high @entity3875 was fed. The effectiveness of @entity14282 to reduce the incidence of @entity6446 in young broilers was higher when the dietary @entity460 level was below 0.85%. The incidence of @entity6446 in Ross cockerels was low (< 25%) when dietary @entity460 was greater than 0.85%.
