R. Bras. Zootec.01/Feb/2000;29(1):243-52.
Use of meat sheep sire breed on fine wool ewe flocks to produce fast-growing lambs for slaughter
DOI: 10.1590/S1516-35982000000100032
ABSTRACT – Sixty-nine lambs from the crossbreeding Corriedale or Polwarth ewes with Suffolk, Ile de France rams or from the same ewe breed were used to evaluate their performance and carcass characteristics. Lambs were maintained under grazing until weaning time (60 days), then were confined for 90 days and fed corn silage and concentrate based diet. A completely randomized design in a factorial arrangement was used. The use of meat type rams on fine wool ewes did not affect lamb birth and weaning weight, however increased the carcass weight and compacting, without effect on forequarter and ribs. Subcutaneous fat thickness was not affected by the genotype and it was greater for females. Loin eye area did not show difference between genotypes. Carcass measurements showed differences between genotypes, being the ones from Suffolk mating the longest, followed by the crossbred from Ile de France.
Keywords: carcass; dressing; lamb; meat sheep breed