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Genetic changes to selection for yearling weight and correlated responses on body measurements in nelore cattle

Joslaine Noely Santos Gonçalves Cyrillo, Alexander Geoge Razook, Maria Eugenia Zerloti Mercadante, Leopoldo Andrade de Figueiredo, Ana Claudia Ruggieri


Records of 5050 Nelore of the selection program of the Experimental Station of Sertãozinho (SP), Brazil, born between 1978 and 2000 were used. The data of the selection lines NeS and NeT, and a control line (NeC), included information on body measurements. The genetic changes, obtained by animal model, for the yearling weight (YW) were 2.67, 37.84 and 46.77 kg for the NeC, NeS and NeT, respectively, for hip height were –0.64, 3.78 and 4.62 cm in the same order. Chest girth, distance between hip bones and body length presented changes of -0.62, -0.20 and -0.10 cm in the NeC. NeT showed the highest values: 1.85, 3.70 and 0.74 cm for the same traits. The heritabilities ranged from 0.20 to 0.48. Selection on YW promoted positive genetic responses for the direct trait, and for the correlated traits.


7th World Congress on Genetics Applied to Livestock Production, August 19-23, 2002, Montpellier, France

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