Effect of supplemental protein quality and evaporative cooling on performance of dairy cows during hot weather

Persistent Link:
http://hdl.handle.net/10150/278030
Title:
Effect of supplemental protein quality and evaporative cooling on performance of dairy cows during hot weather
Author:
Chen, Kai Hang, 1965-
Issue Date:
1991
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:
Two experiments were conducted. In experiment 1, diets were supplemented with blood, fish and soybean meals (HQ) or corn gluten meal (LQ) for similar CP and UIP, but differed in Lys%(HQ =.91; LQ =.59). Diets were fed to evaporatively cooled (EC) or non-cooled (S) cows. Milk yield was higher for HQ than LQ and for EC than S. Compared to S, EC cows tended to consume more feed and had lower rectal temperatures and respiration rates. Experiment 2 consisted of a metabolic and an in situ trial. Ruminal, postruminal and total tract digestibilities of DM on HQ and LQ diets did not differ, while postruminal digestibility of CP was higher for HQ than LQ. The pattern of EAA flowing to the duodenum was not affected by diets; however, after 24 h incubation in the rumen, residual Lys tended to be higher, but Leu and Phe lower for HQ than LQ. Rumen bypass of Lys is increased by feeding diets high in UIP and Lys, resulting in increased milk yields. (Abstract shortened with permission of author.)
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Agriculture, Animal Culture and Nutrition.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College
Degree Grantor:
University of Arizona
Advisor:
Huber, John T.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleEffect of supplemental protein quality and evaporative cooling on performance of dairy cows during hot weatheren_US
dc.creatorChen, Kai Hang, 1965-en_US
dc.contributor.authorChen, Kai Hang, 1965-en_US
dc.date.issued1991en_US
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.abstractTwo experiments were conducted. In experiment 1, diets were supplemented with blood, fish and soybean meals (HQ) or corn gluten meal (LQ) for similar CP and UIP, but differed in Lys%(HQ =.91; LQ =.59). Diets were fed to evaporatively cooled (EC) or non-cooled (S) cows. Milk yield was higher for HQ than LQ and for EC than S. Compared to S, EC cows tended to consume more feed and had lower rectal temperatures and respiration rates. Experiment 2 consisted of a metabolic and an in situ trial. Ruminal, postruminal and total tract digestibilities of DM on HQ and LQ diets did not differ, while postruminal digestibility of CP was higher for HQ than LQ. The pattern of EAA flowing to the duodenum was not affected by diets; however, after 24 h incubation in the rumen, residual Lys tended to be higher, but Leu and Phe lower for HQ than LQ. Rumen bypass of Lys is increased by feeding diets high in UIP and Lys, resulting in increased milk yields. (Abstract shortened with permission of author.)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.grantorUniversity of Arizonaen_US
dc.contributor.advisorHuber, John T.en_US
dc.identifier.proquest1346690en_US
dc.identifier.bibrecord.b27251780en_US
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