01354naa a2200277 a 450000100080000000500110000800800410001910000190006024501530007926000090023252005990024165000120084065000110085265000140086365000150087765000170089265000120090965000160092165000130093765000090095065000150095965000170097465300140099170000190100577300520102417897182008-12-17       1951    bl ---       0--  u    #d1 aHIGNETT, S. L.  aThe influence of nutrition on reproductive efficiency in cattle. I.The effect of calcium and phosphorus intake on the fertility of cows and heifers.  c1951  a1. Details of an ivestigation of the effect of calcium and phosphorus intakes on  fertility in cows and heifers are given. 2. Ina group of 802 cows and heifers we were able to demonstrate that when P2O5 intake was low a rise in CaO intake impaired breeding efficiency, but when P2O5 intake was high a low CaO intake was often associated with low fertility and a high CaO intake with high fertility. 3. For high fertility in dairy cattle it appeared that the P2O5 intake should be considerably higher than the generally accepted 23 grammes for maintenance and 19 grammes for each gallon of milk.  acalcium  acattle  anutrition  aphosphorus  areproduction  aCálcio  aFertilidade  aFósforo  aGado  aNutrição  aReprodução  aFertility1 aHIGNETT, P. G.  tVeterinary Recordgv.63, p.603-609, Sept. 1951.