RESUMO
Background: The protein supplements can represent up to 50% of the costs in the concentrated fraction of the diet in dairy cows. A possible alternative that meets the requirements regarding protein levels and can reduce the costs are the nonprotein nitrogen (NPN) supplementst. For these reasons, this strategy it is widely used in low milk production systems, where cost of production has a higher impact. In this scenario the use of NPN aims to increase production without altering the economic balance of the system. Recently, a supplement consisting of urea coated with a biodegradable polymer was developed. This system promotes the controlled release of urea that can reach up 36 h after ingestion. The aim of this study was to evaluate the effects of feeding slow release urea formula on the composition and milk production, metabolic parameters and pH of the ruminal fluid of dairy cows. Materials, Methods & Results: This study was conducted over a period of 60 days, using 20 multiparous cows with 90 ± 18 days in milk. The animals were divided into two groups according to the type of NPN: 1) conventional urea (CG) and 2) slow release urea (SRG). Each group was composed of six Holstein cows (average body weight 528.7 ± 51.9 kg) and four Jersey cows (average body weight 389.3 ± 33.3 kg). Cows in the CG received a diet containing 80g of conventional urea/cow/day, and SRG cows were
Na pecuária leiteira a relação custo-benefício na alimentação animal é decisiva para o êxito econômico da atividade, o que leva o produtor a utilizar alternativas que diminuam os custos em relação à suplementação protéica, através do uso de fontes de nitrogênio não protéico (NNP), como a uréia. Em sistemas de baixa produção leiteira, a utilização de NNP visa aumentar a produção sem alterar o equilíbrio econômico do sistema. [...]
RESUMO
Background: The protein supplements can represent up to 50% of the costs in the concentrated fraction of the diet in dairy cows. A possible alternative that meets the requirements regarding protein levels and can reduce the costs are the nonprotein nitrogen (NPN) supplementst. For these reasons, this strategy it is widely used in low milk production systems, where cost of production has a higher impact. In this scenario the use of NPN aims to increase production without altering the economic balance of the system. Recently, a supplement consisting of urea coated with a biodegradable polymer was developed. This system promotes the controlled release of urea that can reach up 36 h after ingestion. The aim of this study was to evaluate the effects of feeding slow release urea formula on the composition and milk production, metabolic parameters and pH of the ruminal fluid of dairy cows. Materials, Methods & Results: This study was conducted over a period of 60 days, using 20 multiparous cows with 90 ± 18 days in milk. The animals were divided into two groups according to the type of NPN: 1) conventional urea (CG) and 2) slow release urea (SRG). Each group was composed of six Holstein cows (average body weight 528.7 ± 51.9 kg) and four Jersey cows (average body weight 389.3 ± 33.3 kg). Cows in the CG received a diet containing 80g of conventional urea/cow/day, and SRG cows were
Na pecuária leiteira a relação custo-benefício na alimentação animal é decisiva para o êxito econômico da atividade, o que leva o produtor a utilizar alternativas que diminuam os custos em relação à suplementação protéica, através do uso de fontes de nitrogênio não protéico (NNP), como a uréia. Em sistemas de baixa produção leiteira, a utilização de NNP visa aumentar a produção sem alterar o equilíbrio econômico do sistema. [...]