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

Marcos Paulo Gonçalves de Rezende, Paulo Luiz Souza Carneiro, Riccardo Moretti, Johnny Iglesias Mendes Araujo, Israel Luz Cardoso, André Campêlo Araujo, Julio Cesar de Souza, Riccardo Bozzi, Carlos Henrique Mendes Malhado


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


Degree of maturity; Feed efficiency; Multivariate analysis; Nonlinear model; Struthio camelus.

Full Text:



Bangar, Y. C., Magotra, A., & Yadav, A. S. (2020). Estimates of covariance components and genetic parameters for growth, average daily gain and Kleiber ratio in Harnali sheep. Tropical Animal Health and Production, 52(5), 2291-2296. doi: 10.1007/s11250-020-02248-z

Basuny, A. M. M., Arafat, S. M., & Nasef, S. L. (2011). Utilization of ostrich oil in foods. International Research Journal of Biochemistry and Bioinformatics, 2(8), 199-208.

Belichovska, D., Hajrulai-Musliu, Z., Uzunov, R., Belichovska, K., & Arapcheska, M. (2015). Fatty acid composition of ostrich (Struthio camelus) abdominal adipose tissue. Macedonian Veterinary Review, 38(1), 53-59. doi: 10.14432/j.macvetrev.2014.11.028

Brand, T. S., & Gous, R. M. (2006). Feeding ostriches. In Feeding in domestic vertebrates: from structure to behaviour (pp. 136-155). Wallingford, England: CAB.

Brand, T. S., Gous, R. M., Kruger, A. C. M., Aucamp, B. B., Nel, C. J., & Horbanczuk, J. O. (2004). The effect of dietary energy and protein (amino acids) concentration on the performance of slaughter ostriches. South African Journal of Animal Science, 34(6), 104-106.

Brand, T. S., Nell, C. J., & Van Schalkwyk, S. J. (2000). The effect of dietary energy and protein level on the production of growing ostriches. South African Journal of Animal Science, 30(1), 15-16. doi: 10.4314/ sajas.v30i4.3889

Carstens, P. D., Sharifi, A. R., Brand, T. S., & Hoffman, L. C. (2014). The growth response of ostrich (Struthio camelus var. domesticus) chicks fed on diets with three different dietary protein and amino acid concentrations. British Poultry Science, 55(4), 510-517. doi: 10.1080/00071668.2014.933772

Cyril, H., Josef, B., & Widya, P. B. P. (2021). The growth curve of gompertz model in body weight of mixed-sex goose breeds in slovakia. Genetics and Biodiversity Journal, 5(1), 28-32.

Emmans, G. C., & Fisher, C. (1986). Problems in nutritional theory. In C. Fisher, & K. N. Boorman (Eds.), Nutrient requirements of poultry and nutritional research (pp. 9-39). London: Butterw Orths.

Figueiredo, G. C., Rezende, M. P. G., Figueiredo, M. P., Bozzi, R., Souza, A. A. O. Jr., Carneiro, P. L. S., & Malhado, C. H. M. (2019). Morphofunctional characteristics of Dorper sheep crossed with Brazilian native breeds. Small Ruminant Research, 170, 143-148. doi: 10.1016/j.smallrumres.2018.11.024 ….

Gomes, R. C., Sainz, R. D., Silva, S. L., César, M. C., Bonin, M. N., & Leme, P. R. (2012). Feedlot performance, feed efficiency reranking, carcass traits, body composition, energy requirements, meat quality and calpain system activity in Nellore steers with low and high residual feed intake. Livestock Science, 150(1-3), 265-273. doi: 10.1016/j.livsci.2012.09.012

DOI: http://dx.doi.org/10.5433/1679-0359.2021v42n6SUPL2p4059

Semina: Ciênc. Agrár.
Londrina - PR
E-ISSN 1679-0359
DOI: 10.5433 / 1679-0359
E-mail:  semina.agrarias@uel.br
Este obra está licenciado com uma Licença  Creative Commons Atribuição-NãoComercial 4.0 Internacional