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Prediction of in vivo organic matter digestibility of beef cattle diets from degradation parameters estimated from in situ and in vitro incubations

Published online by Cambridge University Press:  27 March 2020

Pedro Del Bianco Benedeti*
Affiliation:
Department of Animal Sciences, Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil Department of Animal Sciences, Universidade do Estado de Santa Catarina, Chapecó, Santa Catarina 89815-630, Brazil
Sebastião de Campos Valadares Filho
Affiliation:
Department of Animal Sciences, Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil
Diego Zanetti
Affiliation:
Instituto Federal do Sul de Minas Gerais – Campus Machado, Machado, Minas Gerais 37750-000, Brazil
Fabyano Fonseca e Silva
Affiliation:
Department of Animal Sciences, Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil
Breno de Castro Silva
Affiliation:
Department of Animal Sciences, Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil
Herlon Meneguelli Alhadas
Affiliation:
Department of Animal Sciences, Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil
Jéssica Marcela Vieira Pereira
Affiliation:
Department of Animal Sciences, Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil
Marcos Vinicios Carneiro Pacheco
Affiliation:
Department of Animal Sciences, Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil
Pauliane Pucetti
Affiliation:
Department of Animal Sciences, Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil
Ana Clara Baião Menezes
Affiliation:
Department of Animal Sciences, Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil
Flavia Adriane de Sales Silva
Affiliation:
Department of Animal Sciences, Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil
Letícia Artuzo Godoi
Affiliation:
Department of Animal Sciences, Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil
Stefanie Alvarenga Santos
Affiliation:
Department of Animal Sciences, Universidade Federal da Bahia, Salvador, Bahia 40110-909, Brazil
*
Author for correspondence: Pedro Del Bianco Benedeti, E-mail: pedro.benedeti@udesc.br

Abstract

The objective of this meta-analysis study was to develop and validate equations estimated from in situ and in vitro methods to predict in vivo ruminal digestibility of organic matter (OM) of beef cattle diets. The database was composed of individual data of 23 diets from six experiments. Information collected from these studies was: in vivo digestibility and degradation parameters of OM calculated from in situ and in vitro incubations. The values of estimated times for the in situ and in vitro incubations to access in vivo digestibility of OM, and differences between degradation at 24, 48 and 72 h (in situ and in vitro) and in vivo digestibility were analysed in a model that included the fixed effects of forage neutral detergent fibre level. Thereafter, a multiple stepwise regression was carried out using OM digestibility as a dependent variable and degradation parameters (A = water-soluble fraction; B = potentially degradable water-insoluble fraction; and kd = degradation rate of fraction B) as independent variables. Equation validation was performed using data from a seventh experiment that have the same methods than previous studies. Stepwise regression results showed that the kd contributed significantly in most of the algorithms derived to predict in vivo digestibility. Validation analysis showed that equations developed from both in vitro and in situ incubations accurately estimated the in vivo digestibility of OM (P > 0.05). Our results suggest that equations developed to estimate OM digestibility showed both precision and accuracy; however, in situ method presented better results than in vitro.

Type
Modelling Animal Systems Research Paper
Copyright
Copyright © Cambridge University Press 2020

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