Abstract
The objective of this study was to evaluate the effect of two energy protein supplementation protocols on performance and economic viability of Nellore bulls calves from weaning to pasture finishing. Nellore calves with 8 months of age, mean weight 285.16 ± 22.74 kg, belonging to the Fronteira Farm municipality of Porto Murtinho, Mato Grosso do Sul, were evaluated between May 2015 and September 2016. Analysis, between the treatments for final weight, mean total gain and average daily weight gain. Steers supplemented with Protocol 2 consumed more dry matter (807.57 kg) and Protocol 1 animals (427.03 kg). As this level of dry matter consumption there was also an increase in the amount of crude protein supplied to Protocol 2 in 320.17 kg. The highest total income observed was Protocol 1 (R $ 2,868.90), this result is associated with the higher final weight and the carcass yield of 52.6% after slaughter, although Protocol 2 presented higher carcass yield (54%). It is concluded that the supplementation of Protocol 1 was more efficient for performance; however the total revenue was insufficient to pay the production costs, generating a negative profitability due to the expense of supplementation in the experimental period.
Highlights
The objective of this study was to evaluate the effect of two energy protein supplementation protocols on performance and economic viability of Nellore bulls calves from weaning to pasture finishing
Steers supplemented with Protocol 2 consumed more dry matter (807.57 kg) and Protocol 1 animals (427.03 kg)
As this level of dry matter consumption there was an increase in the amount of crude protein supplied to Protocol 2 in 320.17 kg
Summary
O experimento foi conduzido na Fazenda Fronteira localizada no município de Porto Murtinho, Mato Grosso do Sul, com 80 bezerros da raça Nelore, não castrados com idade de 8 meses. Cada grupo de bezerros foi alojado em áreas vizinhas com quatro piquetes e uma praça de alimentação contenho cocho para suplementação e bebedouro. Foram utilizados dois protocolos de suplementação com diferentes quantidades de matéria seca (MS) e proteína bruta (PB) fornecidos uma vez ao dia às 16:00 horas. Teores bromatológicos dos suplementos utilizados para cada protocolo. A cada 60 dias foram realizados mensurações de peso corporal dos animais. Ao final da pesquisa foram calculados os indicadores de desempenho e produtividade: Consumo total e diário de suplemento, ganho de peso médio diário (GMD), ganho de peso médio total (GPT); Índice de Conversão Alimentar (consumo médio de mistura mineral em um período de tempo / ganho de peso médio) utilizados para a identificação da relação do custo/benefício de um determinado suplemento. No caso de ser observada diferença significativa nos resultados, para as características mais relacionadas, utilizando-se o programa estatístico SAS 9.2 (SAS, 2004)
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