Udder oedema was studied in eight Jersey cows with rectovaginal constriction (RVC) and three normal Jersey cows. A complete physical examination was performed at least two weeks before parturition, at parturition and two weeks after parturition. Jersey cows with RVC developed udder oedema as early as 14 days before parturition, and condition persisted for three to 10 days following parturition. Mammary blood flow and cranial superficial epigastric venous blood pressure were measured in three Jersey cows with RVC with udder oedema and three normal Jersey cows. The former with udder oedema had a significant decrease in mammary blood flow at parturition compared to the normal Jersey cows (P less than 0.05); there was no significant difference in mammary blood flow between Jersey cows with RVC and normal Jersey cows two weeks before parturition (P greater than 0.05). A significant mean increase in cranial superficial epigastric venous blood pressure occurred at parturition when compared to two weeks before parturition in Jersey cows with RVC (P less than 0.05), but normal Jersey cows had no significant increase in cranial superficial epigastric vein pressure during these two periods of measurement (P greater than 0.05). There was no significant increase in jugular vein blood pressure during the two periods of measurement in Jersey cows with RVC or normal Jersey cows (P greater than 0.05). There was a significant negative correlation between mammary blood flow and cranial superficial epigastric pressure at parturition (r = 0.733, P less than 0.05).
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