Abstract

LENIS-VALENCIA, Claudia Patricia; MOLINA, Enrique José  and  ALVAREZ-FRANCO, Luz Angela. Productivity and growth curves using non-linear models in a cross between ovino de pelo colombiano x pelibuey. rev.udcaactual.divulg.cient. [online]. 2022, vol.25, n.2, e1853.  Epub Aug 03, 2022. ISSN 0123-4226.  https://doi.org/10.31910/rudca.v25.n2.2022.1853.

The creole hair sheep (CHS) developed adaptive advantages to the tropical climate, which allow them to have resistance to diseases, high fertility and prolificacy. Currently, there is little research on the productivity of CHS in systems associated with the cultivation of sugarcane, which makes it necessary to carry out research to promote its attributes. The purpose of this research was to analyze the productivity and body development of a crossing of CHS, using production parameters and growth curves.180 animals of single and multiple births were used; the follow weight was recorded: at birth (WB), at weaning (WW); at 210 days (W210), and furthermore, daily gains of pre-weaning (WDPRE) and post-weaning (WPPOS) were recorded. The data were analyzed using descriptive statistics with a GLM with the effects sex (S), type of birth (TB), number of births (NB) and period of birth (PB). The non-linear models Gompertz, Logistic, Brody, Richards and Von Bertalanffy were used in 1455 records of weights at different ages to perform growth curves. All analyzes were performed with the SAS statistical package. The R2, AIC and BIC coefficients obtained by the Gauss-Newton method were considered to select the best fit model. The males presented higher averages in the variables WB, WW, W210) and WPOS. The TB affected all the variables; The WB and the WPPOS were affected by the NB and the PB affected the WB, the WDPRE, the W210 and the WPPOS. The best fit model for the growth curves was of Richards.

Keywords : Growth and development; Nonlinear models; Pre and post-weaning earnings; Productivity in sheep; Sexual dimorphism.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )