Influence of protein degradability and evaporative cooling on performance of lactating cows during hot environmental temperatures

Persistent Link:
http://hdl.handle.net/10150/277021
Title:
Influence of protein degradability and evaporative cooling on performance of lactating cows during hot environmental temperatures
Author:
Taylor, Ronald Brian, 1962-
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:
Two trials were conducted to determine the effect of protein degradability (low (LD) vs high (HD)) and evaporative cooling (shade cooling vs shade) on performance of 60 lactating Holstein cows in mid-lactation. Cooling and the LD diet increased milk production, 3.5% FCM and feed efficiency in trial 1 (24 cows) while in trial 2 (36 cows) LD diet increased milk production and feed efficiency and cooling did not exert a significant effect. Differences between trials were probably due to higher environmental temperature humidity indexes (77.0 vs 72.0), and a higher quality of the rumen bypass protein in the LD diet in trial 2 than trial 1. Cooling reduced respiration rates in trial 1 and respiration rates, rectal and inner ear temperatures in trial 2. Eating patterns were unaffected by protein degradability or cooling.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Milk yield.; Dairy farming.; Holstein-Friesian cattle.; Cattle -- Feeding and feeds -- Climatic factors.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Animal Sciences
Degree Grantor:
University of Arizona
Advisor:
Huber, J. Tal

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleInfluence of protein degradability and evaporative cooling on performance of lactating cows during hot environmental temperaturesen_US
dc.creatorTaylor, Ronald Brian, 1962-en_US
dc.contributor.authorTaylor, Ronald Brian, 1962-en_US
dc.date.issued1989en_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 trials were conducted to determine the effect of protein degradability (low (LD) vs high (HD)) and evaporative cooling (shade cooling vs shade) on performance of 60 lactating Holstein cows in mid-lactation. Cooling and the LD diet increased milk production, 3.5% FCM and feed efficiency in trial 1 (24 cows) while in trial 2 (36 cows) LD diet increased milk production and feed efficiency and cooling did not exert a significant effect. Differences between trials were probably due to higher environmental temperature humidity indexes (77.0 vs 72.0), and a higher quality of the rumen bypass protein in the LD diet in trial 2 than trial 1. Cooling reduced respiration rates in trial 1 and respiration rates, rectal and inner ear temperatures in trial 2. Eating patterns were unaffected by protein degradability or cooling.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectMilk yield.en_US
dc.subjectDairy farming.en_US
dc.subjectHolstein-Friesian cattle.en_US
dc.subjectCattle -- Feeding and feeds -- Climatic factors.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, J. Talen_US
dc.identifier.proquest1336910en_US
dc.identifier.oclc24003206en_US
dc.identifier.bibrecord.b17714771en_US
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