Data/hora: 08/06/2024 09:42:17

Provedor de dados: | 96
País: | Brazil
Título: | Red clover silage: an alternative for mitigating the impact of nitrogen excretion in ovine production systems
Autores: | Guzatti,Gabriela Cristina; Duchini,Paulo Gonçalves; Kozloski,Gilberto Vilmar; Niderkorn,Vincent; Ribeiro-Filho,Henrique Mendonça Nunes.
Data: | 2019-01-01
Ano: | 2019
Palavras-chave: | Bioactive compounds; Duodenal flow; Polyphenol-oxidase; Quinones; Urinary nitrogen excretion.
Resumo: | ABSTRACT The objective was to quantify the flow of intestinal nutrients and nitrogen excretion and retention in sheep receiving isoproteic diets. Eight Texel x Lacaune wethers (average body weight = 25±2.5 kg) were fitted with duodenal cannula and housed in metabolic cages. Wethers were assigned to the treatments in a crossover design with two periods of 20 days each, and all feces and urine produced by the wethers were collected. The treatments consisted of two isoproteic (160 g kg−1 of crude protein on dry matter basis) diets composed of red clover (RC) or lucerne (LU; Medicago sativa) silages plus corn silage and concentrate feed. The digestible organic matter and metabolizable energy intake did not differ between treatments. The intestinal non-ammonia N (NAN) flow was 5.9 g day−1 (37%) higher in RC wethers than in those of the LU treatment. This result was a consequence of both an increase in the efficiency of microbial protein synthesis (12.7% higher) and a decrease in ruminal degradable protein (RDP) content (20% lower) of the diet. However, the increase in the intestinal NAN flow was accompanied by a reduction in intestinal digestibility of N, resulting in similar daily N retention between treatments. The reduction of RDP content was probably the main reason for reductions in N urinary excretion in RC wethers compared with those in the LU treatment, showing that RC silage may be a tool for mitigating the impact of N excretion in ovine production systems, without changes in N retention.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100722
Editor: | Sociedade Brasileira de Zootecnia
Relação: | 10.1590/rbz4820190044
Formato: | text/html
Fonte: | Revista Brasileira de Zootecnia  v.48 2019
Fonte: | info:eu-repo/semantics/openAccess