Levels of neutral detergent fiber in diets with forage palm for dairy goats

N.M Sousa,D.S Silva,A.N Medeiros,J.S Oliveira,J.P.F Ramos,E.A Brito,E.M Santos

doi:10.1590/1678-4162-10181

Abstract

ABSTRACT This study aimed to evaluate the amount of fiber in the diet that is able to promote better use of nutrients in the diet of dairy goats when forage palm is the main source of roughage. Fifteen Alpine dairy goats were distributed in a 5 × 5 triple Latin square containing five treatments and five periods, and each treatment contained. We tested five diets composed of different contents of neutral detergent fiber from Tifton hay (NDFf) in the dry matter of rations containing forage palm: D1: 11.98%; D2: 18.31%; D3: 23.68%; D4: 28.76% and D5: 32.12% NDFf. The intake of dry matter, crude protein, neutral detergent fiber, non-fiber carbohydrates and ether extract decreased linearly with the increase in NDFf content. There was a linear increase of milk production and milk protein with increasing dietary NDFf. The fat, dry extract, protein, pH and acidity of the evaluated milk were not affected by increasing the levels of NDFf in the diet. In situations where dairy goats are fed forage palm and other types of forage are limited, 11.98% NDF from forage other than palm can be used as an effective source of NDF.

Highlights

The supply of forage for ruminants in semiarid regions is based on the use of crops adapted to water stress, such as the forage palm, which guarantees the maintenance of animal productivity during the dry season
It is necessary that part of this fiber should come from forage, because neutral detergent fiber from forage (NDFf) stimulates the chewing activity and saliva production, which maintain the buffering capacity of rumen (Nutrient..., 2001)
Increasing the concentration of NDFf in the diet produced a decrease in dry matter (DM) intake and, in nutrients and metabolizable energy (ME)

Summary

Introduction

The supply of forage for ruminants in semiarid regions is based on the use of crops adapted to water stress, such as the forage palm, which guarantees the maintenance of animal productivity during the dry season. Forage palm has around 0.16% of oxalate based in dry matter, very below the level that is necessary to cause toxicity, which is 2% of dry matter (Batista et al, 2009). It is necessary that part of this fiber should come from forage, because neutral detergent fiber from forage (NDFf) stimulates the chewing activity and saliva production, which maintain the buffering capacity of rumen (Nutrient..., 2001). Various parameters have been used to monitor ruminal conditions including milk fat percentage (Nutrient..., 2001). Effective fiber is the amount of fiber in the diet that maintains the percentage of fat in the milk (Nutrient..., 2001)

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Results

Conclusion