Kleiber ratios and growth curves of African Black and Red Neck ostrich breeds and their crossbreeds

The selection of animals with lower production costs can be achieved by using feed efficiency and growth curve information. Kleiber ratio (KR) is an alternative option for discriminating against the that have greatest weight gain about their final weight. Alternative curves ostriches African Black (AB) Red Neck (RN) breeds crossbreeds (CB) were investigated KR Gompertz equation. Univariate multivariate analyses used. highest adult was identified in RN CB. AB more precocious than CB individuals. Only reached 75% mature at one year age. At 180 days, showed better KR. different from others, mainly 90 days days. Considering analysis, regardless sex, Other subgroups separated sex. In a market preferring minor structure (smaller cuts) greater precocity, it would suitable to opt AB. When body (larger are desired, males CR best option, however, will slaughtered age value (may generate bigger cost ). It possible obtain precocity high KR, being well represented breed.