Meta-análise do impacto da fibra em detergente neutro sobre o consumo, a digestibilidade e o desempenho de vacas leiteiras em lactação

ABSTRACT - It was evaluated the effects of the chemical characteristics and in vivo NDF digestibility (IVNDFD) onintake, digestibility and performance of dairy cows in fedlot by using a meta-analysis procedure from 285 observations of sixexperiments. It was used data of animals fed diets based on corn silage (n = 213) or sugarcane (n = 72). Despite the lower NDFcontent of sugarcane (45.27% of DM) compared to corn silage (54.48%), it was noted lower intakes of dry matter (DMI) andNDF, which responded with a lower milk yield. It was observed a greater reduction in DMI (kg/day) with the increase of NDFf(NDF forage, % DM) in sugarcane diets (332.4 g of DM for each 1% of NDFf) in relation to corn silage (96 g of DM for each1% of NDFf). The greatest effect of ruminal repletion of sugar cane NDF is caused by the indigestible fraction, majoritary,despite the highest degradation rate of NDF potentially degradable fraction in relation to corn silage. Milk production notcorrected (MP) and MP corrected to 4% fat (MPC) and the content of milk protein decreased linearly with the increase ofNDFf content, regardless of the forage source. However, MP and MPC were not affected by NDFnf (non-forage NDF) level.Intakes of DM, NDF, TDN and milk fat content decreased linearly with increase in the lignin:NDF ratio, with greater amplitudein sugarcane based diets in relation to silage corn. Dry matter intake, MP and MPC reduced linearly and at the same magnitudeamong forage sources, with the increase in NDFD of the diet. The effect of NDF and lignin on intake, digestibility and animalperformance depend upon the source used.Key Words: corn silage, ruminal retention, sugarcane

• Publication year

  2011

• Venue

  Revista Brasileira De Zootecnia

• Publication date

  2011-07-01

• Fields of study

  Agricultural and Food Sciences, Chemistry

• Identifiers
  DOI 10.1590/S1516-35982011000700026
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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