Lindt F, Blum J W
Division of Nutrition Pathology, University of Berne, Switzerland.
Zentralbl Veterinarmed A. 1994 Jun;41(5):333-42. doi: 10.1111/j.1439-0442.1994.tb00100.x.
Effects of serum iron (Fe), haematological variables and on blood lactate levels before and after treadmill exercise or transport to the slaughterhouse, on meat traits, and on growth performance of feeding milk replacer (MR), planned to contain 10, 20, 30, 40, 50 or 80 mg Fe/kg, were studied in veal calves. If supplied less than 50 mg Fe/kg MR, calves developed hypoferraemia and anaemia, the degree of which was dependent on Fe intake. Serum Fe concentration, saturation of transferrin with Fe and the degree of anaemia in calves fed 20 or 10 mg Fe/kg MR were nearly identical. Serum Fe concentration and haematological traits barely changed in calves fed 50 mg Fe/kg MR during the growth trail, but serum Fe concentration increased when MR contained 80 mg Fe/kg in calves fed 50 or more Fe/kg MR. Growth performance was smaller in calves fed 10 mg Fe/kg MR than in those fed greater amounts of Fe/kg MR. Carcass taxation was inversely related to Fe intake. In conclusion, MR containing only 10 mg Fe/kg caused marked anaemia and reduced growth performance. Feeding MR with only 20 mg Fe/kg is not necessarily sufficient to prevent development of severe anaemia. Feeding MR with 50 mg Fe/kg would seem to be physiologically the most appropriate amount of Fe for veal calves, but was too high for acceptable carcass taxation.
研究了血清铁（Fe）、血液学变量以及跑步机运动前后或运输至屠宰场前后的血乳酸水平对肉用犊牛的肉质性状和生长性能的影响，这些犊牛饲喂的代乳粉（MR）计划含铁量为10、20、30、40、50或80mg Fe/kg。如果代乳粉中铁含量低于50mg/kg，犊牛会出现低铁血症和贫血，其程度取决于铁摄入量。饲喂20mg Fe/kg或10mg Fe/kg代乳粉的犊牛血清铁浓度、转铁蛋白铁饱和度和贫血程度几乎相同。在生长试验期间，饲喂50mg Fe/kg代乳粉的犊牛血清铁浓度和血液学特征几乎没有变化，但当代乳粉含铁量为80mg/kg时，饲喂50mg Fe/kg及以上铁含量代乳粉的犊牛血清铁浓度会升高。饲喂10mg Fe/kg代乳粉的犊牛生长性能低于饲喂更高铁含量代乳粉的犊牛。胴体品质与铁摄入量呈负相关。总之，仅含10mg Fe/kg的代乳粉会导致明显贫血并降低生长性能。仅饲喂含铁量20mg/kg的代乳粉不一定足以预防严重贫血的发生。饲喂50mg Fe/kg的代乳粉在生理上似乎是犊牛最合适的铁含量，但对于可接受的胴体品质来说过高。
