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Full-Text Articles in Life Sciences
Effects Of Cannulation, Bst Administration And Protein Degradability On Rumen And Duodenal Characteristics And Milk Production Response In Holstein Dairy Cows, Margaret D. Winsryg
Effects Of Cannulation, Bst Administration And Protein Degradability On Rumen And Duodenal Characteristics And Milk Production Response In Holstein Dairy Cows, Margaret D. Winsryg
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Bovine somatotropin (bST) is a protein synthesized at the base of the brain and released by the pituitary gland into the circulatory system. BST is transported by the circulatory system and absorbed only by cells of target organs that possess cell surface receptors for the protein (11, 41). Its effect is initiated via a protein receptor initiation and cyclic AMP cascade. This effect on the cell continues well past the degradation of the bST molecule. BST is likely transported into the cell, where it is degraded. Its constituent blocks, amino acids, are used to synthesize new proteins or converted to …
A Comparison Of Three Estrous Detection Management Schemes For Dairy Heifers, Ann Lagerstedt
A Comparison Of Three Estrous Detection Management Schemes For Dairy Heifers, Ann Lagerstedt
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Heifers should represent the greatest genetic potential within a dairy herd. To maximize this potential, heifers must be inseminated to proven sires, a practice requiring management changes on many dairies. Holstein heifers (n=115) were allotted to one of three groups to compare alternatives to daily estrous detection that may facilitate the management of a program of artificial insemination for heifers. Group 1 heifers (Controls) received no treatment but were observed twice daily for signs of estrus. Group 2 heifers (2X-PGF) were synchronized with two injections of prostaglandin F2 alpha given 11 days apart and observed for estrus. Group 3 heifers …
The Effects Of Methionyl Bovine Somatotropin Administration On Luteinizing Hormone In Dairy Cattle, Joseph Charles Dalton
The Effects Of Methionyl Bovine Somatotropin Administration On Luteinizing Hormone In Dairy Cattle, Joseph Charles Dalton
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Sixteen lactating regularly cycling dairy cows (14 primiparous, 2 multiparous) were used to determine the effects of somatotropin administration on basal, peak, and pulse luteinizing hormone concentrations during the breeding period. In addition, the effects of somatotropin administration on the pituitary response to a gonadotropinreleasing hormone challenge was studied. The experimental group received daily somatotropin treatments (25mg) for 24 days. The control group received a daily placebo. All animals were treated with three injections of prostaglandin F2-alpha (25 mgjtreatment) for estrus synchronization. Somatotropin and placebo treatments began with the second prostaglandin injection. Sixty hours following the final prostaglandin injection, all …