Abstract
Four, ruminally cannulated, Hereford × Angus cows were used to study factors associated with feed intake patterns around parturition. Feed intake during the final trimester of gestation was relatively stable, in spite of a noticeable decrease in ruminal capacity. Postpartum feed intake appeared to increase, as did ruminal capacity. Blood progesterone fell after parturition, whereas estradiol did not change except for a large rise around parturition. Some plasma metabolites measured differed before and after calving; however, magnitude and patterns of change do not suggest a direct relationship with intake.
Highlights
The variation in voluntary intake by beef cows can be paritally attributed to alterations in physiological status
Four, ruminally cannulated, Hereford x Angus cows were used to study factors associated with feed intake patterns around parturition
Blood progesterone fell after parturition, whereas estradiol did not change except for a large rise around parturition
Summary
The variation in voluntary intake by beef cows can be paritally attributed to alterations in physiological status. Studies indicate that voluntary intake varies significantly between pregnant and lactating animals, little work has concentrated on changes in intake, fill, and passage rate during pregnancy. These changes must be identified to efficiently manage the pregnant cow for optimum performance. Our objective was to determine the association between intake patterns around parturition and ruminal fill, digesta passage, and blood concentrations of hormones and metabolites in beef cows
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