In situ ruminal degradation of sallow tree leaves using different mathematical models

Abstract

Objective. The objective of this study was to determine the in situ digestion parameters of sallow leaves (Salix Alba) as an alternative food, not commonly used in animal diets using mathematical models. Materials and methods. Four mathematical models were used to describe the ruminal disappearance of dry matter (DM) and crude protein (CP) of sallow leaves: non lagged exponential (Model I); lagged exponential (Model II); Gompertz (Model III), and generalized Mitscherlich (Model IV). Results. Results of DM and CP degradability characteristics showed that all the models fitted well (r2>0.98) to the disappearance data. There were minor differences between the models in terms of statistical evaluations. However, the models differed in the estimated parameters depending on the model’s nature and structure and the parameters included. Conclusions. Given that some models estimated negative values for the studied parameters, they were not biologically acceptable. For this reason, the only model I can be used for estimating the degradability of DM and CP of sallow leaves. In terms of effective degradability (ED) of DM, model III was not used in the calculations because of calculating negative values for part A. Sallow leaves constitute the largest possible proportion of the ruminal degradability fractions, and effective degradability can be used as a forage source in ruminant feeds.

Effects of thyme (Thymus vulgaris), organic acid, probiotic and prebiotic on carcass characteristics and intestinal microbial population in broiler chickens fed with normal and low protein diets

“…Data were log-transformed before analyzing to compensate for any unequal variances. Tukey's test at the 5% level of probability was used to compare the means (Palangi, 2021).…”

Identification of Ruminal Fermentation Curves of Some Legume Forages Using Particle Swarm Optimization

“…Different nutritional sciences utilize modeling to explain various phenomena and express connections among the components that affect a biological process [ 7 ]. There are numerous methods for estimating feed-quality proportions; however, the detailed studies of biological processes could offer valuable insight into the dynamics of biological processes and reveal their other dimensions [ 8 , 9 ]. Nonlinear models could be used to obtain more detailed and comprehensive information on the degradability of feeds.…”