01754nam a2200277 a 450000100080000000500110000800800410001910000240006024501290008426001080021330000160032152008740033765000230121165000210123465300170125565300150127265300230128765300240131065300180133465300200135270000190137270000190139170000220141070000210143270000230145310452592023-06-12       2001    bl uuuu     u00u1 u    #d1 aRODRIGUES, A. de A.  aPerfomance of beef heifers of de various genetic groups, supplemented or not, in coastcross pastures.h[electronic resource]  aIn: INTERNATIONAL GRASSLAND CONGRESS, 19., 2001, São Pedro, SP. Proceedings... Piracicaba: ESALQc2001  ap. 701-702.  aThe objective of this was to determine whether perfomance of beef heifrs of different genetic groups was affected by breed x nutriotional environment interactions. Sixty four weaned heifrs, 16 per genetic group: 1/2 angus + 1/2 Nellore (AN), 1/2 Canchim + 1/2 Nellore (CN), 1/2 Simmental + 1/2 Nellore (SN) and pure Nellore ((NE), were used with or without 3.0KG of concentrate. animal . day in a fertilized coastcross pasture under ratational grazing system. There were effects of genetic group and supplentation (P&lt0.05) on the weight and age at first estrusbut there was no interaction betweem then. In a rotational grazing sytem wth 4000kg of available dry matter per hectare with 13% of crude protein, the crossbres AN, supplemented or not was more precocious (111 days) than Nellore heifers, showing the firts estrus at 356 days of age and 324kg of live weight.  arotational grazing  aCynodon Dactylon  aAgeat pubert  aBeef catle  aIdade de purbedade  aPastejo rotacionado  asuplementacao  aSupplementation1 aCRUZ, G. M. D.1 aBARBOSA, R. T.1 aALENCAR, M. M. de1 aCORREA, L. de A.1 aOLIVEIRA, G. P. de