Intake and digestibility of low-quality hay with nonprotein nitrogen supplementation in cattle

被引：7
|
作者：
Mallmann, Giovanni Mateus [1 ]
Patino, Harold Ospina [1 ]
da Silveira, Andre Luis Finkler [1 ]
Medeiros, Fabio Schuler [1 ]
Knorr, Marcelo [1 ]
机构：
[1] Univ Fed Rio Grande do Sul, Fac Agron, Dep Zootecnia, BR-90540000 Porto Alegre, RS, Brazil
来源：
PESQUISA AGROPECUARIA BRASILEIRA | 2006年 / 41卷 / 02期
关键词：
protein supplementation; urea; starea; digestible organic matter; rumen degradable protein;
D O I：
10.1590/S0100-204X2006000200019
中图分类号：
S [农业科学];
学科分类号：
09 ;
摘要：
The objective of this work was to evaluate the effect of nonprotein nitrogen supplementation levels on the digestibility of low-quality hay (Cynodon dactylon), which was offered ad libitum to Hereford bulls aging 17 months and weighing 220 kg. The evaluated treatments were: hay + no urea supplement; hay + supplement with 0.28 g Urea kg(-1) BW0.75; hay + supplement with 0.55 g urea kg(-1) BW0.75; hay + supplement with 0.83 g urea kg(-1) BW0.75 and hay + supplement with 1.11 g urea kg(-1) BW0.75. Hay composition presented 3.86% of crude protein and 84.66% of neutral detergent fiber. Digestibility of organic matter, organic matter of forage, neutral detergent fiber, cellulose and hemicellulose were not affected by nonprotein nitrogen level; total intake of these components showed a quadratic response to nonprotein nitrogen supplementation. Organic matter metabolic fecal excretion was not affected by supplementation, suggesting a simultaneous increase in both passage (intake increase) and digestion rates (stable digestibility). The digestible organic matter intake showed a quadratic response with the increase of urea Supplementation levels. The relationship between rumen degradable protein intake and digestible organic matter intake showed a maximization point, when rumen degradable protein intake was equivalent to 8.1% of digestible organic matter intake.
引用
收藏
页码：331 / 337
页数：7
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