Accuracy, precision and robustness of internal markers to predict total apparent digestibility of dry matter in horses

作者：Pombo G V^*; Valle T D; Bradi R A; Bueno I C S

来源：Arquivo Brasileiro de Medicina Veterinaria e Zootecnia, 2016, 68(3): 769-775.

DOI：10.1590/1678-4162-8441

• horse
• nutrition
• method
• indirect

The aim of this study was to evaluate the accuracy, precision and robustness of different internal markers to predict total digestibility of dry matter for horses. Five no breed mares were used in maintenance, with an average weight of 406 + 76.9kg and approximate age of 3.5 years, staying in individual stalls. The experiment was arranged in a 5x5 latin square design (five diets and five animals). Food samples were collected and the faeces provided for bromatological determining indicators and determining the indigestible fractions was carried out with in vitro incubation. The internal markers used were indigestible neutral detergent fiber (NDFi), indigestible acid detergent fiber (ADFi), indigestible cellulose (iCEL) and indigestible acid detergent lignin (LDAi). The indicators studied had mean recovery rate (TR) very close to 100%. Because they have a lower rate of recovery, NDFi and LDAi indicators have negative biases and differ from zero (P<0.05). There was no significant difference between the slopes of the regression of the biases of indicators and of variables dry matter intake, consumption indicator and body weight (P>0.05). The ADFi seems to be the most appropriate indicator to establish reference values for digestibility. The iCEL seems to be more appropriate to compare factors among the same study.

• 出版日期2016-6