Características da carcaça de novilhos F1 Guzerá + Nelore e F2 Guzerá + Limousin + Nelore

Abstract

Carcass characteristics of ½ Guzerá + ½ Nellore (F1) and ½ Guzerá + ¼ Limousin + ¼ Nellore (F2) were evaluated. Each experimental group was constituted by twelve animals. The bovines presented respective average weights to F1 and F2 of 477,50 ± 18,54 and 468,89 ± 21,03 kg at the beginning of experimental period and 526,83 ± 18,77 kg and 516,08 ± 20,03 kg in the slaughter occasion. The steers were maintained in Panicum maximum cv. Tanzânia pastures and received feeding, in proportion of 1% live weight, with 22,2% of crude protein and 72,5% of total digestible nutrients (TDN). There was no significant difference (P>0,05) between genetic groups to the majority of body measures, cold carcass, special hindquarter and forequarter weights, special hindquarter percentage, cold carcass and special hindquarter yield, fat thickness, fat thickness adjusted to 100 kg of cold carcass, conformation e the variables that express the carcass physical composition. There was no significant correlation, positive or negative, between carcass measures and economical interesting characteristics. The F1 animals were superior to F2 to side cut weight, percentage and yield. On the other hand, the F2 animal presented higher values to spine-loin length, side cut percentage and yield, loin eye area and loin eye area adjusted to 100 kg of cold carcass when compared to F1 ones. To the correlations, there was significant and positive association between thoracic perimeter (0,62), thoracic depth (0,35), rump length (0,40) and cold carcass weight, as well as there was significant and positive correlations between spine-loin length and loin eye area (0,61) and cushion thickness and special hindquarter yield (0,43). Significant and negative correlation was detected between rump length and muscle yield (-0,43). Considering the experimental condition and the evaluated genetic groups, it is concluded that F2 animals are longer and present right proportions of carcass commercial cuts and measures as loin eye area in relation to the F1. Thoracic perimeter and depth, spine-loin and rump length and cushion thickness are positively associated to the cold carcass weight, loin eye area and muscle and special hindquarter yield.