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• W71747386 abstract "An experiment was designed to study the effects of forageavailability, season and intensity of grazing, and distribution andbehavior of sheep on their forage preferences. Three grazing periodsof 15 days each were used to study the effect of season. Eachgrazing period included a heavy and a moderate stocking intensity.Pastures were divided by a grid into 30.48 m x 30.48 m compartments.Each compartment was sampled for botanical composition of availableherbage prior to and after grazing. Esophageally fistulated sheepwere allowed to graze freely and positions of individual sheepwith respect t o compartments were recorded at 5-minute intervalsduring the daily forage sample collection period. Immediatelyfollowing collection of fistula samples, daily measurements weretaken on leaf area index and height for all plant species. Estimatesof aerbage yield and forage utilization were derived from heightleafarea measurements by regressions. Botanical composition ofthe diet was determined through microscopic analysis of plant cuticlefragments on dried, ground esophageal samples. Analysis of the dietary data indicated that season had noeffect on the botanical composition of diets of sheep. However,grazing intensity significantly (P < 0. 20) affected diets of sheep.Significant differences (P < 0 . 01) were also found in proportionof plant species that comprised the diet at any particular time.Individual sheep were significantly (P < 0.01) different in theirforage preferences . There were no significant changes in botanicalcomposition of the compartments due to grazing. However. bareground increased significantly (P < 0.10) more under heavy stockingthan under moderate stocking. Herbage yield was found to be highly correlated with leaf areaindex and height (r 2 = 0.85) in the ungrazed control pasture.Forage yield in the grazed pastures was a l so correl ated with leafarea index and height (r 2 = 0.79) . Utilization was estimated asthe difference between the two parameters . Sheep were observed to graze more heavily around the peripheryof shrubs than in the interspaces. The heavily grazed areas aroundshrubs were found to be significantly larger in heavily stockedpastures (P < 0.10) . Observations of grazing behavior showed thatsheep tended to orient themselves toward conspicuous objects . Inso doing, they grazed a strip leading from one conspicuous object toanother (ex. shrubs) . In an experiment designed to determine the role of suchconspicuous objects in animal distribution and feeding behavior,sheep distribution, in relation to randomly-placed cardboard boxes.was found to be non-random and significantly (P < 0.05) related to theposition of the boxes. It was also found that sheep grazed theherbaceous species to a certain height below which the plants becameinaccessible to grazing. Micro-associations of plant species greatly influenced preferences.Sagebrush (Artemisia tridentata) plants exerted a negative effect onuse of adjacent bitterbrush (Purshia…" @default.
• W71747386 created "2016-06-24" @default.
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• W71747386 date "1973-01-01" @default.
• W71747386 modified "2023-09-23" @default.
• W71747386 title "Factors Affecting Feeding Habits of Sheep Grazing Foothill Ranges of Northern Utah" @default.
• W71747386 hasPublicationYear "1973" @default.
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