| Autor: |
Machado E; Departamento de Zootecnia, Universidade Estadual de Maringá, Avenida Colombo, Maringá, 5790, PR, Brazil. ericamachado27@gmail.com., Yoshimura EH; Departamento de Zootecnia, Universidade Estadual de Maringá, Avenida Colombo, Maringá, 5790, PR, Brazil., Santos NW; Departamento de Zootecnia, Universidade Estadual de Maringá, Avenida Colombo, Maringá, 5790, PR, Brazil., Agustinho BC; Departamento de Zootecnia, Universidade Estadual de Maringá, Avenida Colombo, Maringá, 5790, PR, Brazil., Pereira Lde M; Departamento de Zootecnia, Universidade Estadual de Maringá, Avenida Colombo, Maringá, 5790, PR, Brazil., Samensari RB; Departamento de Zootecnia, Universidade Estadual de Maringá, Avenida Colombo, Maringá, 5790, PR, Brazil., de Aguiar SC; Departamento de Zootecnia, Universidade do Estado de Mato Grosso, Rodovia BR 174, Km 209, Pontes e Lacerda, 78250-000, MT, Brazil., Zeoula LM; Departamento de Zootecnia, Universidade Estadual de Maringá, Avenida Colombo, Maringá, 5790, PR, Brazil. |
| Abstrakt: |
The objectives of this study were to evaluate the effect of crude protein (CP) levels in the diet of growing female buffaloes on nitrogen metabolism and estimate protein requirements for maintenance. Four female buffaloes were used, cannulated in the rumen, with an average initial body weight (BW) of 355 ± 3.5 kg, in a Latin square (4 × 4) with four animals and four levels of CP in the diet (70, 90, 110, and 130 g/kg dry matter (DM)) composed of corn silage and concentrate. The increase in protein intake with increasing levels of dietary CP resulted in a higher concentration of ammonia in the rumen and higher ruminal disappearance of PB. However, omasal flow of protein increased linearly as did the efficiency of microbial protein synthesis. The CP levels affected DM intake and other nutrients positively, but there was no effect on nutrient total digestibility. Nitrogen (N) balance, when expressed relative to N intake, had an average value of 48.5 % observed across. The protein requirement for the maintenance of growing female buffaloes was 4.6 g CP/kg BW(0.75). |
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