Factors affecting response of cows to recombinant methionyl bovine somatotropin

Persistent Link:
http://hdl.handle.net/10150/292276
Title:
Factors affecting response of cows to recombinant methionyl bovine somatotropin
Author:
Sullivan, James Lawrence, 1965-
Issue Date:
1989
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Eighty lactating Holstein cows were randomly assigned to one of two treatments: Placebo(C) or 500 mg recombinant methionyl bovine somatotropin (BST). Cows were intramuscularly injected with C or BST every 14 d for 36 wk beginning 60 d postpartum. Factors analyzed for differences in milk yield response to BST included: production level, genetic potential, stage of lactation, and heat stress. Response of low producing cows to BST was numerically greater than that of medium or high producers (averaging 27%, 13%, and 20%, respectively, above controls). However, there was not a significant interaction between BST treatment and production group. Cows of a lower genetic potential exhibited a greater response to BST than cows of a higher potential, but the treatment x genetic potential interaction was not significant. Response of cows to BST in mid to late lactation was slightly greater than in cows in early lactation (13.7% and 15.1% vs. 9.6%, respectively) but no significant interaction was noted. No difference in response was noticed during periods of high ambient temperature.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Agriculture, Animal Culture and Nutrition.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Animal Sciences
Degree Grantor:
University of Arizona
Advisor:
Huber, John T.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleFactors affecting response of cows to recombinant methionyl bovine somatotropinen_US
dc.creatorSullivan, James Lawrence, 1965-en_US
dc.contributor.authorSullivan, James Lawrence, 1965-en_US
dc.date.issued1989-
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractEighty lactating Holstein cows were randomly assigned to one of two treatments: Placebo(C) or 500 mg recombinant methionyl bovine somatotropin (BST). Cows were intramuscularly injected with C or BST every 14 d for 36 wk beginning 60 d postpartum. Factors analyzed for differences in milk yield response to BST included: production level, genetic potential, stage of lactation, and heat stress. Response of low producing cows to BST was numerically greater than that of medium or high producers (averaging 27%, 13%, and 20%, respectively, above controls). However, there was not a significant interaction between BST treatment and production group. Cows of a lower genetic potential exhibited a greater response to BST than cows of a higher potential, but the treatment x genetic potential interaction was not significant. Response of cows to BST in mid to late lactation was slightly greater than in cows in early lactation (13.7% and 15.1% vs. 9.6%, respectively) but no significant interaction was noted. No difference in response was noticed during periods of high ambient temperature.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectAgriculture, Animal Culture and Nutrition.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineAnimal Sciencesen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorHuber, John T.en_US
dc.contributor.committeememberDeNise, S. K.en_US
dc.contributor.committeememberBrown, W. H.en_US
dc.identifier.proquest1339232-
dc.identifier.oclc24340675-
All Items in UA Campus Repository are protected by copyright, with all rights reserved, unless otherwise indicated.