{"id":{"repo_id":"sdstate","oai_identifier":"oai:openprairie.sdstate.edu:etd-2534"},"canonical_url":"https://search.dev.ndltd.org/etd/sdstate/oai:openprairie.sdstate.edu:etd-2534","repository":{"repo_id":"sdstate","name":"South Dakota State University","base_url":"https://openprairie.sdstate.edu/do/oai/"},"display":{"title":"Interactions of Bovine Somatotropin and Nutrition on Milk Production and Composition of Dairy Cows","abstract":"<p><strong>Forty-eight multiparous Holstein cows were used in a 2 X 2 factorial arrangement to study interactions of bovine somatotropin (bST) and nutrition during weeks 5 through 20 postpartum. Main effects were bST (-or+ 10.3 mg per day) and diet (control, C; or high protein and energy, HPE). Diet C was formulated to contain 16.3% crude protein and 1.65 Meal net energy for lactation (NEL) per kg dry matter (DM) for lactation, while the HPE diet was formulated to contain 18% crude protein and 1.74 Meal NEL/kg DM, with additional energy as fat from extruded soybeans and calcium salts of fatty acids. Diets were 50:25:25 concentrate: alfalfa hay: corn silage (DM basis). Bovine somatotropin increased yields of milk (37.9 versus 40.9 kg/day) and of 4% fat-corrected milk (32.3 versus 35.7 kg/day). The HPE diet increased milk yield (38.5 versus 40.3 kg/day) with yield of 1% fat-corrected milk higher for HPE+ (36.0) than HPE- (33.6). Percent fat was not affected by treatment (2.99, 3.17, 3.07, and 3.17 for c-, c+, HPE-, and HPE+, respectively). Percent milk protein was reduced with added fat and only partially increased with HPE+ (3.07, 3.00, 2.81, 2.86). Dry matter intake was not significantly elevated by bST (22.8 versus 23.5 kg/day), but was lower for HPE {23.8 versus 22.4 kg/day). Increased dietary protein and energy augmented the milk production response to bST.</strong></p>","abstract_html":"&lt;p&gt;&lt;strong&gt;Forty-eight multiparous Holstein cows were used in a 2 X 2 factorial arrangement to study interactions of bovine somatotropin (bST) and nutrition during weeks 5 through 20 postpartum. Main effects were bST (-or+ 10.3 mg per day) and diet (control, C; or high protein and energy, HPE). Diet C was formulated to contain 16.3% crude protein and 1.65 Meal net energy for lactation (NEL) per kg dry matter (DM) for lactation, while the HPE diet was formulated to contain 18% crude protein and 1.74 Meal NEL/kg DM, with additional energy as fat from extruded soybeans and calcium salts of fatty acids. Diets were 50:25:25 concentrate: alfalfa hay: corn silage (DM basis). Bovine somatotropin increased yields of milk (37.9 versus 40.9 kg/day) and of 4% fat-corrected milk (32.3 versus 35.7 kg/day). The HPE diet increased milk yield (38.5 versus 40.3 kg/day) with yield of 1% fat-corrected milk higher for HPE+ (36.0) than HPE- (33.6). Percent fat was not affected by treatment (2.99, 3.17, 3.07, and 3.17 for c-, c+, HPE-, and HPE+, respectively). Percent milk protein was reduced with added fat and only partially increased with HPE+ (3.07, 3.00, 2.81, 2.86). Dry matter intake was not significantly elevated by bST (22.8 versus 23.5 kg/day), but was lower for HPE {23.8 versus 22.4 kg/day). Increased dietary protein and energy augmented the milk production response to bST.&lt;/strong&gt;&lt;/p&gt;","abstract_has_math":false,"creators":["Austin, Christopher Lee"],"institution":null,"degree_name":"Master of Science (MS)","degree_level":"Thesis - University Access Only","degree_discipline":"Dairy Science","degree_department":null,"school":null,"contributors":["David J. Schingoethe"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1990,"date_issued":"1990-01-01T08:00:00Z","date_published":"1990-01-01T08:00:00Z","updated_at":"2026-07-24T04:29:15Z","subjects":["Dairy Science"],"languages":["en"],"rights":["<p>In Copyright - Non-Commercial Use Permitted<br /><a href=\"http://rightsstatements.org/vocab/InC-NC/1.0/\">http://rightsstatements.org/vocab/InC-NC/1.0/</a></p>"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://openprairie.sdstate.edu/etd/1529","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["David J. Schingoethe"]},{"key":"dc:creator","label":"Author","values":["Austin, Christopher Lee"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.available","label":"Dc Date Available","values":["2017-08-14T07:00:00Z"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Dairy Science"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis - University Access Only"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science (MS)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Dairy Science"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["<p>In Copyright - Non-Commercial Use Permitted<br /><a href=\"http://rightsstatements.org/vocab/InC-NC/1.0/\">http://rightsstatements.org/vocab/InC-NC/1.0/</a></p>"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://openprairie.sdstate.edu/etd/1529"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["<p><strong>Forty-eight multiparous Holstein cows were used in a 2 X 2 factorial arrangement to study interactions of bovine somatotropin (bST) and nutrition during weeks 5 through 20 postpartum. Main effects were bST (-or+ 10.3 mg per day) and diet (control, C; or high protein and energy, HPE). Diet C was formulated to contain 16.3% crude protein and 1.65 Meal net energy for lactation (NEL) per kg dry matter (DM) for lactation, while the HPE diet was formulated to contain 18% crude protein and 1.74 Meal NEL/kg DM, with additional energy as fat from extruded soybeans and calcium salts of fatty acids. Diets were 50:25:25 concentrate: alfalfa hay: corn silage (DM basis). Bovine somatotropin increased yields of milk (37.9 versus 40.9 kg/day) and of 4% fat-corrected milk (32.3 versus 35.7 kg/day). The HPE diet increased milk yield (38.5 versus 40.3 kg/day) with yield of 1% fat-corrected milk higher for HPE+ (36.0) than HPE- (33.6). Percent fat was not affected by treatment (2.99, 3.17, 3.07, and 3.17 for c-, c+, HPE-, and HPE+, respectively). Percent milk protein was reduced with added fat and only partially increased with HPE+ (3.07, 3.00, 2.81, 2.86). Dry matter intake was not significantly elevated by bST (22.8 versus 23.5 kg/day), but was lower for HPE {23.8 versus 22.4 kg/day). Increased dietary protein and energy augmented the milk production response to bST.</strong></p>"]},{"key":"dc:title","label":"Title","values":["Interactions of Bovine Somatotropin and Nutrition on Milk Production and Composition of Dairy Cows"]}]}],"canonical_facts":{"dc:contributor":["David J. Schingoethe"],"dc:creator":["Austin, Christopher Lee"],"dc:date.available":["2017-08-14T07:00:00Z"],"dc:description.abstract":["<p><strong>Forty-eight multiparous Holstein cows were used in a 2 X 2 factorial arrangement to study interactions of bovine somatotropin (bST) and nutrition during weeks 5 through 20 postpartum. Main effects were bST (-or+ 10.3 mg per day) and diet (control, C; or high protein and energy, HPE). Diet C was formulated to contain 16.3% crude protein and 1.65 Meal net energy for lactation (NEL) per kg dry matter (DM) for lactation, while the HPE diet was formulated to contain 18% crude protein and 1.74 Meal NEL/kg DM, with additional energy as fat from extruded soybeans and calcium salts of fatty acids. Diets were 50:25:25 concentrate: alfalfa hay: corn silage (DM basis). Bovine somatotropin increased yields of milk (37.9 versus 40.9 kg/day) and of 4% fat-corrected milk (32.3 versus 35.7 kg/day). The HPE diet increased milk yield (38.5 versus 40.3 kg/day) with yield of 1% fat-corrected milk higher for HPE+ (36.0) than HPE- (33.6). Percent fat was not affected by treatment (2.99, 3.17, 3.07, and 3.17 for c-, c+, HPE-, and HPE+, respectively). Percent milk protein was reduced with added fat and only partially increased with HPE+ (3.07, 3.00, 2.81, 2.86). Dry matter intake was not significantly elevated by bST (22.8 versus 23.5 kg/day), but was lower for HPE {23.8 versus 22.4 kg/day). Increased dietary protein and energy augmented the milk production response to bST.</strong></p>"],"dc:identifier":["https://openprairie.sdstate.edu/etd/1529"],"dc:language":["en"],"dc:rights":["<p>In Copyright - Non-Commercial Use Permitted<br /><a href=\"http://rightsstatements.org/vocab/InC-NC/1.0/\">http://rightsstatements.org/vocab/InC-NC/1.0/</a></p>"],"dc:subject":["Dairy Science"],"dc:title":["Interactions of Bovine Somatotropin and Nutrition on Milk Production and Composition of Dairy Cows"],"thesis:degree_discipline":["Dairy Science"],"thesis:degree_level":["Thesis - University Access Only"],"thesis:degree_name":["Master of Science (MS)"]},"updated_at":"2026-07-24T04:29:15Z"}