Supplementation on beef cattle performance in pastures: season of the year
DOI:
https://doi.org/10.5433/1679-0359.2011v32n1p373Keywords:
Rainy season, Drought season, Protein supplement, Energy supplement, Substitution effect, Meta-analysis.Abstract
The present study used meta-analysis to assess the effects of supplementation on beef cattle performance in pastures in Brazil, classifying data by season of the year. There were reviewed articles published in journals indexed from 1999 to 2007. There were used 70 articles and data were grouped according to season of the year (Rainy, Drought, Transition Rainy/Drought and Transition Drought/Rainy). It was done comparisons between animals without supplement (control) and supplemented animals, to determine the real effect of supplementation on performance and to find the corrected daily gain in each study. A meta-analysis was performed using three sequential analyses: graphic, correlation and variance. The regression equations were obtained through the covariance, and the correlation and significance level, between dependent and independent variables were obtained using the SAS statistical program PROC CORR. In rainy season (n=49) 45.8 % of corrected daily gain ranged between 0.11 and 0.20 kg/day and for drought season (n = 54) it was observed that 21.2 % of the data were under 0.02 kg/d and 21.2% above 0.40 kg/day. Correlation between corrected daily gain during drought and consumption of protein supplement was 0.598 (P < 0 .01), and with the TDN/PB ratio of forage this correlation was 0.612 (P < 0.01). The evaluated data that supplementation increases the adjusted daily gain of animals on pasture.
Downloads
Downloads
Published
How to Cite
Issue
Section
License
Semina: Ciências Agrárias adopts the CC-BY-NC license for its publications, the copyright being held by the author, in cases of republication we recommend that authors indicate first publication in this journal.
This license allows you to copy and redistribute the material in any medium or format, remix, transform and develop the material, as long as it is not for commercial purposes. And due credit must be given to the creator.
The opinions expressed by the authors of the articles are their sole responsibility.
The magazine reserves the right to make normative, orthographic and grammatical changes to the originals in order to maintain the cultured standard of the language and the credibility of the vehicle. However, it will respect the writing style of the authors. Changes, corrections or suggestions of a conceptual nature will be sent to the authors when necessary.
