Correlation of Milk Production with Quality and Quantity of Herbage Intake under Rotational and Daily Strip Grazing

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Abstract
Chromium oxide and plant pigments were used to determine herbage digestibility, fecal output, and digestible and total intake for 5 cows rotationally and daily strip grazing alfalfa-bromegrass (Medicago falcata and Bromus inermis) pasture in 1955. Time was included as an independent variable in studying the relationship of milk production to other variables through multiple correlation and regression analysis. Arguments were advanced to support representing time as a discontinuous arithmetic series corresponding to the actual days on the experimental pasture during the grazing season. Although there was marked linearity of decline in lactation with advancing time, daily milk production was significantly related to variations in herbage digestibility and live weight also. These were the main variables related to milk production under strip grazing. Under rotational grazing, digestible and total intake and fecal output were also significantly associated with milk production.