The reproductiveand productive behaviour of Santa Inês ewes were evaluated as a functionof supplementation in different stages of pregnancy, where NS = pasture duringthe day and cassava bagasse during the night over the breeding season and pregnancy,S46 = NS plus supplement (soybean hulls) from the 46th day after the beginningof the breeding season until the birth and S100 = NS plus supplement (soybeanhulls) from the 100th day after the beginning of the breeding seasonuntil the birth. Ninety-Four Santa Inês ewes were utilized, mating byfive Santa Inês and five Dorset ram. The treatment did not affect eweweight on the 84 days after the beginning of the supplementation (EW 4), weightof the ewe at the weaning (WEW), pregnancy incidence (0 or 1) at the final thirdpart of it (PREG), birth rate (BIRTH), natality rate (NR) and prolificity (PROLI),being the averages of 49.54 kg; 0.82; 0.71; 0.88 and 1.26 respectively. Ewessupplementation, sex and genetic group of the lamb did not influence the birthweight (LWB), by the age of 30 days (LW30) and by the 60 days (LW60). The averageswere, respectively, 3.47 kg; 8.26 kg and 12.42 kg. The type of birth affectedthe LWB and the LW30. There was no difference for the total weight of the lambsat birth (TWB), total weight of the lambs after 30 days (TW30) and total weightof the lambs after 60 days (TW60) between the treatments, inside each type ofbirth and among the genetic groups. The supplementation stages of the ewe, thegenetic group of the lamb and the type of birth did not influence the deathrate, from the birth until the age of 30 and 60 days. The reproductive performanceof the supplementeds ewes in the pregnancy period using 0.5% of live weight,with soybean hulls, was not modified.
