Comparison of whole short staple, whole Pima, cracked Pima and ground Pima cottonseed in diets for lactating dairy cows.

Persistent Link:
http://hdl.handle.net/10150/185944
Title:
Comparison of whole short staple, whole Pima, cracked Pima and ground Pima cottonseed in diets for lactating dairy cows.
Author:
Sullivan, James Lawrence
Issue Date:
1992
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 lactation studies with accompanying digestion trials were conducted to compare the feeding value of Pima cottonseed, with differing degrees of processing, to short staple cottonseed for lactating dairy cows. Additional tests were conducted to examine physical and chemical characteristics of both Pima and short staple cottonseed and the effect of processing on storage characteristics of cottonseeds. Pima cottonseed is higher in CP and ether extract and lower in NDF and ADF than short staple seed. Pima seed has a greater bulk density, a greater proportion of the (-)-gossypol isomer and a lower proportion of the (+)-gossypol compared to short staple cottonseed. In the first lactation study, milk yield was similar across all treatments. Milk fat was higher (P < .05) for finely cracked Pima (x 3.0 mm) and whole Pima diets. Feed efficiency was greatest (P < .05) for the cracked Pima diet. Percentage whole seed passing into the feces of that consumed, was 11% for the whole Pima and 5.2% for the short staple. Total tract digestibility of ADF decreased and that of ether extract increased in cows fed cracked Pima compared to whole Pima or short staple. In the second lactation study, milk yield was higher (P < .05) for cows fed ground Pima (x 2.5 mm), than either whole Pima or coarsely cracked Pima (x 3.5 mm), with short staple intermediate. Feed efficiency (SCM/DMI) was greater for cows fed ground Pima and short staple diets (1.14) than for those fed cracked Pima or whole Pima. Stearic acid was lower, and linoleic and linolenic acids were higher in milk of cows fed ground Pima compared to short staple. Passage of whole seed was two-times greater for cows fed whole Pima compared to whole short staple (12.3% vs. 6.2%), and processing of Pima seed eliminated whole seeds passing in the feces. Ether extract digestibility was lower for the whole Pima compared to the other treatments. Storage of whole, cracked or ground seeds at 32°C and 30% relative humidity for up to 30 d did not cause rancidity or aflatoxin contamination. Storage of processed seeds in covered containers for nine months caused only slight increases in free fatty acid content, and no change in the whole seeds.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Dissertations, Academic.; Animal nutrition.; Dairy cattle -- Feeding and feeds.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Animal Sciences; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Huber, J. Tal

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleComparison of whole short staple, whole Pima, cracked Pima and ground Pima cottonseed in diets for lactating dairy cows.en_US
dc.creatorSullivan, James Lawrenceen_US
dc.contributor.authorSullivan, James Lawrenceen_US
dc.date.issued1992en_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 lactation studies with accompanying digestion trials were conducted to compare the feeding value of Pima cottonseed, with differing degrees of processing, to short staple cottonseed for lactating dairy cows. Additional tests were conducted to examine physical and chemical characteristics of both Pima and short staple cottonseed and the effect of processing on storage characteristics of cottonseeds. Pima cottonseed is higher in CP and ether extract and lower in NDF and ADF than short staple seed. Pima seed has a greater bulk density, a greater proportion of the (-)-gossypol isomer and a lower proportion of the (+)-gossypol compared to short staple cottonseed. In the first lactation study, milk yield was similar across all treatments. Milk fat was higher (P < .05) for finely cracked Pima (x 3.0 mm) and whole Pima diets. Feed efficiency was greatest (P < .05) for the cracked Pima diet. Percentage whole seed passing into the feces of that consumed, was 11% for the whole Pima and 5.2% for the short staple. Total tract digestibility of ADF decreased and that of ether extract increased in cows fed cracked Pima compared to whole Pima or short staple. In the second lactation study, milk yield was higher (P < .05) for cows fed ground Pima (x 2.5 mm), than either whole Pima or coarsely cracked Pima (x 3.5 mm), with short staple intermediate. Feed efficiency (SCM/DMI) was greater for cows fed ground Pima and short staple diets (1.14) than for those fed cracked Pima or whole Pima. Stearic acid was lower, and linoleic and linolenic acids were higher in milk of cows fed ground Pima compared to short staple. Passage of whole seed was two-times greater for cows fed whole Pima compared to whole short staple (12.3% vs. 6.2%), and processing of Pima seed eliminated whole seeds passing in the feces. Ether extract digestibility was lower for the whole Pima compared to the other treatments. Storage of whole, cracked or ground seeds at 32°C and 30% relative humidity for up to 30 d did not cause rancidity or aflatoxin contamination. Storage of processed seeds in covered containers for nine months caused only slight increases in free fatty acid content, and no change in the whole seeds.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectDissertations, Academic.en_US
dc.subjectAnimal nutrition.en_US
dc.subjectDairy cattle -- Feeding and feeds.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineAnimal Sciencesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairHuber, J. Talen_US
dc.contributor.committeememberSwingle, R. Spenceren_US
dc.contributor.committeememberTheurer, C. Brenten_US
dc.contributor.committeememberArmstrong, Dennis Vernen_US
dc.contributor.committeememberAx, Roy L.en_US
dc.identifier.proquest9303288en_US
dc.identifier.oclc713085216en_US
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