Ileal and total tract digestibility and nitrogen utilisation in blue fox (Vulpes lagopus) fed low-protein diets supplemented with DL-methionine and L-histidine

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Ylinen , V , Pylkko , P , Peura , J & Valaja , J 2020 , ' Ileal and total tract digestibility and nitrogen utilisation in blue fox (Vulpes lagopus) fed low-protein diets supplemented with DL-methionine and L-histidine ' , Archives of Animal Nutrition , vol. 74 , no. 3 , pp. 237-255 . https://doi.org/10.1080/1745039X.2020.1716655

Title: Ileal and total tract digestibility and nitrogen utilisation in blue fox (Vulpes lagopus) fed low-protein diets supplemented with DL-methionine and L-histidine
Author: Ylinen, Vappu; Pylkko, Paivi; Peura, Jussi; Valaja, Jarmo
Contributor: University of Helsinki, Animal Science Research
University of Helsinki, Department of Agricultural Sciences
Date: 2020-05-03
Language: eng
Number of pages: 19
Belongs to series: Archives of Animal Nutrition
ISSN: 1745-039X
URI: http://hdl.handle.net/10138/324779
Abstract: To formulate low-protein diets for blue foxes with sufficient amounts of amino acids (AA), AA digestibility and AA requirements of the animals are crucial information. Therefore, a digestibility and nitrogen (N) balance trial was conducted with 20 blue foxes to determine the macronutrient and AA digestibility and N utilisation in low-protein diets supplemented with DL-methionine (Met) and L-histidine (His). In addition, plasma urea and plasma AA were measured. The diets were designated as P24 (control), P20, P20M, P16M and P16MH and contained energy from digestible crude protein (DCP) at 24%, 20% or 16% of total dietary metabolisable energy (ME). The 20% protein level was fed with or without Met and the 16% protein level was fed with Met and with or without His. The apparent total-tract digestibility (ATTD) of crude protein linearly decreased with decreasing dietary protein level. The ATTD of dry matter, organic matter and crude carbohydrates increased when wheat starch was added as a replacement for protein. The apparent ileal digestibility (AID) and ATTD methods were compared to determine the AA digestibility. The decreasing dietary protein supply decreased the ATTD of most of the AA: threonine, tryptophan (Trp), valine, alanine (Ala), aspartic acid (Asp), glutamic acid, glycine (Gly), proline (Pro), serine (Ser) and total AA. The AID of the AA was constant between diets. Diverging AA showed higher or lower digestibility when determined in the AID or ATTD methods. Isoleucine, lysine, Met, Ala and tyrosine showed higher levels of AID. Arginine, His, cysteine (Cys), Trp, Asp, Gly, Pro and Ser showed higher levels of ATTD, which may reflect the net loss of these AA in the large intestine. Met and His supplementation improved the ATTD and AID of the AA in question, respectively, but did not affect the other variables examined. N retention did not differ between diets and renal N excretion decreased with decreasing protein level; thus N utilisation improved. It was concluded that the protein supply and AA composition in low-protein diets with supplemented Met were adequate for adult blue foxes, since the lower protein supply improved N utilisation and did not affect N retention. However, His supplementation failed to reach the designed level and therefore showed no clear results.
Subject: Amino acid
digestibility
blue fox
carnivore
nitrogen utilisation
AMINO-ACID DIGESTIBILITY
PLASMA UREA NITROGEN
NUTRIENT DIGESTIBILITY
ALOPEX-LAGOPUS
GROWTH-PERFORMANCE
LYSINE
DIGESTION
MINK
EXCRETION
FIBER
412 Animal science, dairy science
415 Other agricultural sciences
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