Segundo projeções mercadológicas, os sistemas de produção pecuária terão, em 2050, o desafio de aumentar sua produtividade em 60% e, ao mesmo tempo, conservar os recursos naturais. O Rio Grande do Sul (RS), por possuir papel de destaque na pecuária brasileira e estar historicamente vinculado à produção animal, terá de implementar manejos que aumentem a produtividade forrageira e animal, principalmente nos períodos de escassez alimentar. Para isso, o uso de espécies vegetais adaptadas às condições climáticas desses períodos pode ser uma ferramenta crucial para a manutenção da atividade pecuária e do ecossistema. Nesse contexto, esta revisão objetiva compilar os principais resultados de estudos sobre o consórcio de azevém (principal gramínea hibernal utilizada no RS) com leguminosas, durante o período de escassez forrageira na porção pampeana do RS, sob o contexto de produção forrageira e animal.
Pooled data analysis is an analytical method that combines results from multiple studies. This technique provides a more robust estimate of the effects of an investigation. We performed a database analysis from seventeen experiments developed at Federal University of Santa Maria, Rio Grande do Sul state, Brazil, between 1999 and 2017 to characterize individual performance per area and stocking rate with or without supplementation of replacement heifers grazing winter pastures. Data were separated into two groups: with and without energy supplement provision, and into five subgroups based on supplement levels. Heifers from both groups were maintained under similar forage biomass and leaf blade allowance. Statistical analyses were run on R software using a ‘meta’ package. Supplement supply increased average daily gain and gain of body condition scores by 11.1% and 20.0%, respectively. Supplement levels higher than 1.2% of body weight resulted in higher weight gain per area, with the stocking rate increasing with higher supplement levels.
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