Intraspecific Scaling of Rumen-reticulum Fill Might Depend on Dietary Fiber

Duarte, Adam; Luna, Ryan S.; Starns, Heath D.; Weckerly, Floyd W.

doi:10.1674/0003-0031-172.2.329

Cited by 3 publications

(3 citation statements)

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“…Back fat, a measure of animal condition, is often not considered in studies of gut variation (Weckerly et al 2003;Weckerly 2010). Yet, the findings from two other studies suggest that animal condition might influence food intake and, concomitantly, gut fill (Luna et al 2012;Duarte et al 2014).…”

Section: Discussionmentioning

confidence: 99%

“…Every model had body mass, sex, female lactation status, and time of kill because these covariates invariably influence dry and wet masses (Short et al 1969;Weckerly et al 2003;Weckerly 2010;Luna et al 2012;Duarte et al 2014). We also included an interaction between time of kill and sex in every model because diel foraging patterns usually differ between males and females (Aiken et al 2014;Duarte et al 2014). Models were built to assess whether ADF and diet, or site, were related to rumen-reticulum fill in an additive or multiplicative manner.…”

Section: Discussionmentioning

confidence: 99%

“…Sex and time of kill, as well as the interaction between sex and time of kill, seem to be needed because males and females often differ in feeding times, which determines time since the last meal (Short et al 1969;Luna et al 2012;Aiken et al 2014;Duarte et al 2014). Time of kill might also be useful for controlling for variation in composition of ADF when estimating relationships between ADF and response variables (Fig.…”

Section: Discussionmentioning

confidence: 99%

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Use of rumen–reticulum fill to examine nutrient transfer and factors influencing food intake in white-tailed deer (Odocoileusvirginianus)

et al. 2015

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Estimating relationships of gut fill in mammalian herbivores is useful to understanding digestive functions. Large animals might have more fluid in the gut to facilitate nutrient transfer between the gut lumen and the gut wall. Furthermore, relationships between concentrations of dietary refractory and indigestible fiber (CRIF) and gut fill might indicate whether chemostatic factors or physical distension of the gut affects food intake. We collected white-tailed deer (Odocoileus virginianus (Zimmermann, 1780); 122 males, 152 females) from three sites in central and south Texas that varied in diet quality as indexed by rumen-reticulum crude protein concentrations. Large animals did not have more fluid in their rumina-reticula than small animals because the scalar between body mass and wet mass of rumen-reticulum contents was not greater than the scalar estimated for dry mass of rumen-reticulum contents. We expected a positive or an inverse relationship when rates of forage comminution, digestion, and particle passage were high or low, respectively. At the site where deer had access to a high-quality pelleted diet, we detected a positive relationship between CRIF and dry mass. At sites with free-ranging deer and lower quality diets, relationships between CRIF and dry fill were inversely related. Food intake of deer was probably influenced by chemostatic factors at the site with a high-quality pelleted diet and by physical distension of the gut at the other two sites.Résumé : L'estimation des relations du contenu intestinal chez les herbivores mammaliens est utile pour comprendre les fonctions digestives. Les grands animaux pourraient avoir plus de liquide dans leur intestin pour faciliter le transfert de nutriments entre la lumière et la paroi de ce dernier. En outre, les relations entre la concentration de fibres alimentaires réfractaires et non digestibles (CRIF) et le contenu intestinal pourraient indiquer si des facteurs chimiostatiques ou la distension physique de l'intestin ont une incidence sur l'ingestion d'aliments. Nous avons prélevé des cerfs de Virginie (Odocoileus virginianus (Zimmermann, 1780); 122 mâles, 152 femelles) de trois sites du centre et du sud du Texas présentant de la nourriture de différents niveaux de qualité de la nourriture indiqués par les concentrations de protéines brutes dans le rumen-réticulum. Les grands individus n'avaient pas plus de liquide dans leur rumen-réticulum que les petits individus parce que le scalaire entre la masse corporelle et la masse humide du contenu du rumen-réticulum n'était pas plus grand que le scalaire estimé pour la masse sèche du contenu du rumen-réticulum. Nous nous attendions à une relation positive ou négative quand les taux de communition et de digestion du fourrage et de passage des particules étaient élevés ou faibles, respectivement. Au site où les cerfs avaient accès à des aliments en boulettes de haute qualité, nous avons noté une relation positive entre les CRIF et la masse sèche. Aux sites où les cerfs étaient en liberté et caractérisés par de...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Use of rumen–reticulum fill to examine nutrient transfer and factors influencing food intake in white-tailed deer (Odocoileusvirginianus)

et al. 2015

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Contributions of digestive plasticity to the ability of white-tailed deer to cope with a low-quality diet

Bonin

Tremblay²,

Côté³

2016

JMAMMAL

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Heavier rumen–reticulum organs in white-tailed deer (Odocoileus virginianus) is consistent with dietary bulk not quality

et al. 2018

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The organs that make up the gastrointestinal tract have high energy demands. Therefore, when these organs vary in mass, they should impact metabolic requirements. Mass of the rumen–reticulum organs, the organs that comprise the largest part of the gastrointestinal tract of ruminants, might vary from bulk or nutrient availability of the diet. We examined differences in mass of the rumen–reticulum organs in white-tailed deer (Odocoileus virginianus (Zimmermann, 1780)) from two sites in Texas, USA, with different diet types. Specifically, at one site deer were fed a pelleted ration and at the other site deer consumed a natural browse diet. Accounting for body mass, deer consuming the browse diet had rumen–reticulum organ masses that were about 1.7 times heavier than deer consuming the pelleted diet. Deer consuming the browse diet also had lower diet quality, as indexed by crude protein concentration, than deer consuming the pelleted diet. The digesta loads of deer, however, were similar for the two types of diet. Our study findings are consistent with increased mass of rumen–reticulum organs from greater bulk, not diet quality. Understanding variation in rumen–reticulum organ mass has implications for understanding energy conservation in white-tailed deer.

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Intraspecific Scaling of Rumen-reticulum Fill Might Depend on Dietary Fiber

Cited by 3 publications

References 30 publications

Use of rumen–reticulum fill to examine nutrient transfer and factors influencing food intake in white-tailed deer (Odocoileusvirginianus)

Use of rumen–reticulum fill to examine nutrient transfer and factors influencing food intake in white-tailed deer (Odocoileusvirginianus)

Contributions of digestive plasticity to the ability of white-tailed deer to cope with a low-quality diet

Heavier rumen–reticulum organs in white-tailed deer (Odocoileus virginianus) is consistent with dietary bulk not quality

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