Hematological profiles in dairy cows treated with recombinant bovine somatotropin
Article Abstract:
Treatment of cows with recombinant bovine somatotropin (bST) decreased hematocrit and influenced leukocyte fractions. Eosinophil and lymphocyte fractions were significantly decreased, although the absolute leukocyte count was not affected. Milk yield was increased by BST treatment, with the largest increase coinciding with the periods when hematocrit was affected greatest. Blood levels of insulin-like growth factor-I were higher in bST-treated cows, and are thought to be partially responsible for the leukocyte effects. These bST effects were found to transient.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Effect of prepartum administration of growth hormone-releasing factor on somatotropin, insulin-like growth factory I, milk production and postpartum return to ovarian activity in primiparous beef heifers
Article Abstract:
The administration of growth hormone-releasing factor (GRF) or an analogue called GRF(1-29)-NH2 (GRFa) before parturition increased serum levels of somatotropin. Treated heifers lost more body weight during early lactation, and had a longer postpartum interval to ovarian activity. The serum level of insulin-like growth factor was inversely related to the length of postpartum anestrus. Milk production and calf weaning weights were not affected by GRF or GRFa administration.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
User Contributions:
Comment about this article or add new information about this topic:
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