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• W173656295 abstract "Selective grazing by sheep was examined over a 3-yr period on smooth bromegrass pasture. Finnsheep-cross wether lambs (24.9 ± .6 kg) were stocked at 15 and 30 hd/ha on replicated pastures (1.2 ha) each grazing season. Forage samples were collected by clipping 30, .09-m2 quadrats in each pasture at 14-d intervals. Diet samples were collected from four esophageally fistulated sheep in each pasture at the same 14-d intervals. Sheep selected diets that were higher in IVDMD and CP than the green forage material and lower in NDF. Lignin content of the diet did not differ markedly from that of the available forage. Selectivity indices (SI) to quantify the magnitude of selective pressure for or against forage quality components indicated differences among (P < .05) years and grazing periods within seasons, but stocking rate treatments did not affect SI. Examination of data from yr 1 and 2 indicated that selective pressure for IVDMD and CP, and against NDF, increased as forage quality declined, but below a green forage IVDMD of 50 to 55%, SI decreased sharply. Using principal component analysis, regression equations were developed to predict SI based on forage characteristics. Although these equations were significant (P < .05) for the first 2 yr of data, they did not accurately predict results of the final year. A general multiple regression model for all the data was developed using first derivatives of the first principal component to incorporate rate of change in forage quality. The general model did not predict selectivity with so high an accuracy as was hoped, illustrating that selectivity is not a static function, but rather that it responds to changing forage characteristics in a complex manner." @default.
• W173656295 created "2016-06-24" @default.
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• W173656295 date "1989-01-01" @default.
• W173656295 modified "2023-09-23" @default.
• W173656295 title "Magnitude of Diet Selection by Sheep Grazing Smooth Bromegrass" @default.
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• W173656295 doi "https://doi.org/10.2527/jas1989.6782106x" @default.
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