02692naa a2200445 a 450000100080000000500110000800800410001902400560006010000190011624501030013526000090023852015290024765000080177665000160178465000110180065000180181165000160182965000100184565000200185565000120187565000200188765000100190765000120191765000160192965000180194565000220196365000100198565300110199565300240200665300110203065300130204165300140205465300140206865300220208270000180210470000230212270000210214570000170216677300630218315148762021-09-06       1988    bl uuuu     u00u1 u    #d7 ahttp://dx.doi.org/10.1016/0921-4488(88)90045-42DOI1 aJOHNSON, W. L.  aDietary energy levels and age and weight at puberty in Morada Nova ewe-lambs, in Northeast Brazil.  c1988  aAbstract: Tropical hair sheep of the Morada Nova breed were utilized to study the effect of energy intake on age and weight at puberty. Twenty-four ewe-lambs, 140 ± 1.2 days of age and weighing 12.5 ± 0.25 kg, were assigned to receive 50, 200, 350 or 500 g of maize grain per day (T1, 2, 3 and 4, respectively) along with 150 g of cottonseed cake and a ground maize stover/maize cob mixture ad libitum. Between the beginning of the experiment and first estrus, one lamb was removed from T3 and one from T4 due to rumen disorders. Also, one lamb from T1 was eliminated for reasons not related to experimental treatments. The remaining 21 lambs gained weight at rates of 42 ± 6, 49 ± 5,60 ± 8 and 74 ± 9 gd-1 for T1, 2, 3 and 4, respectively. First estrus, detected by vasectomized teaser rams, was displayed at 283 ± 13, 294 ± 15, 310 ± 16 and 266 ± 16 days of age and 19.1 ± 1.2, 20.6 ± 1.2, 23.4 ± 2.0 and 20.8 ± 1.4 kg of weight for the four treatment groups. Treatment differences were not significant (P &gt 0.05) for age or weight at first estrus. Performance of Morada Nova ewe-lambs in this experiment indicates that animals fed during their growth phase to reach 18-22 kg by 260-320 days of age, will then display first estrus if exposed to a ram; and that, assuming a weaning age and weight equivalent to the conditions of this experiment, these pubertal age/weight combinations can be attained with a post-weaning feeding regime that allows a daily intake of at least 62 g DM per W (kg)0.75. © 1988.  aAge  aBody weight  aBrazil  aenergy intake  aFeed intake  aLambs  aliveweight gain  apuberty  aSexual maturity  aSheep  aConsumo  aCrescimento  aGanho de peso  aMaturidade sexual  aOvino  aBrasil  aConsumo energético  aGrowth  aNordeste  aNortheast  aPuberdade  aRaça Morada Nova1 aBARROS, N. N.1 aOLIVEIRA, E. R. de1 aSIMPLICIO, A. A.1 aRIERA, G. S.  tSmall Ruminant Researchgv. 1, n. 1 , p. 67-72, Mar. 1988.