Short communication: Effect of maternal heat stress in late gestation on blood hormones and metabolites of newborn calves
| Autor: | J. Guo, Geoffrey E. Dahl, B. M. S. Ahmed, X. Weng, A.P.A. Monteiro, Jimena Laporta, Sha Tao, M.J. Hayen, John K. Bernard |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Male medicine.medical_specialty Hot Temperature Offspring medicine.medical_treatment Cattle Diseases Hematocrit Biology Heat Stress Disorders 03 medical and health sciences Internal medicine Genetics medicine Animals chemistry.chemical_classification Fetus medicine.diagnostic_test 3-Hydroxybutyric Acid Insulin Colostrum 0402 animal and dairy science Fatty acid 04 agricultural and veterinary sciences 040201 dairy & animal science Prolactin 030104 developmental biology Endocrinology chemistry Animals Newborn Animal Science and Zoology Cattle Female Food Science Hormone |
| Zdroj: | Journal of dairy science. 99(8) |
| ISSN: | 1525-3198 |
| Popis: | Maternal heat stress alters immune function of the offspring, as well as metabolism and future lactational performance, but its effect on the hormonal and metabolic responses of the neonate immediately after birth is still not clear. The objective of this study was to investigate the blood profiles of hormones and metabolites of calves born to cows that were cooled (CL) or heat-stressed (HS) during the dry period. Within 2 h after birth, but before colostrum feeding, blood samples were collected from calves [18 bulls (HS: n=10; CL: n=8) and 20 heifers (HS: n=10; CL: n=10)] born to CL or HS dry cows, and hematocrit and plasma concentrations of total protein, prolactin, insulin-like growth factor-I, insulin, glucose, nonesterified fatty acid, and β-hydroxybutyrate were measured. Compared with CL, HS calves had lower hematocrit and tended to have lower plasma concentrations of insulin, prolactin, and insulin-like growth factor-I. However, maternal heat stress had no effect on plasma levels of total protein, glucose, fatty acid, and β-hydroxybutyrate immediately after birth. These results suggest that maternal heat stress desensitizes a calf's stress response and alters the fetal development by reducing the secretion of insulin-like growth factor-I, prolactin, and insulin. |
| Databáze: | OpenAIRE |
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