Effect of breed group and slaughter weight on weight gain and feed conversion of intact beef cattle males

Galvao, J.G.; Fontes, C.A.D.A.; Pires, C.C.; Queiroz, A.C.D.; Paulino, M.F.

Revista da Sociedade Brasileira de Zootecnia 20(5): 494-501

1991


Accession: 007241656

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Abstract
A total of 48 animals were used to evaluate the effects of breed group and slaughter weight on weight gain and feed conversion. Sixteen Nelore (NE), 16 F1 Nelore - Marchigiana (NM) and 16 F1 Nelore-Limousine (NL) twenty-month old intact males were used. Animals were fed "ad libitum" a 50:50 concentrate:roughage ration. Four animals of each breed group were slaughtered at the beginning of the trial Relation between empty body weight and live weight determined in these animals were used to estimate initial body weight of all animals of each breed group. Four animals out of the remaining twelve in each group were assigned to slaughter at 90; 100 or 110 percent of mean cow weight of the respective breed group. The weights were 405; 450 and 500 for NE and 450; 500 and 550 kg for NM and NL animals. NM and NL animals gained faster (P < 0.05) and had better feed conversion than NE. NL animals showed better (P < 0.05) feed conversion than NM. There was no significant effect (P > 0.05) of slaughter weight on feed efficiency and weight gain.