Lactational performance and nutrient utilization in high producing cows fed sorghum grains of varying starch degradabilities with or without fat supplementation

Persistent Link:
http://hdl.handle.net/10150/278180
Title:
Lactational performance and nutrient utilization in high producing cows fed sorghum grains of varying starch degradabilities with or without fat supplementation
Author:
Simas, Jose Manuel Correia de, 1967-
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:
Twenty-four multiparous and twelve primiparous Holstein cows were assigned at calving to four treatments in a 2 x 2 factorial design. Factors were: (1) grain processing: dry rolled sorghum (D) vs. steam flaked sorghum (S); (2) rumen inert fat: supplemented (F) vs. non supplemented (C). The F diets were supplemented at 2.5% of dry matter (DM) as Ca-soaps. The S diets increased (P<.02) milk production 12%, while F diets decreased (P<.28) milk 5%, due to a 16% decrease (P<.01) in feed intake. However, F diets increased (P<.01) efficiency of feed utilization 15%, partially sustained by greater (P<.08) body weight losses. The DF diet decreased milk protein 0.21% compared to the DC diet, but the S diets had similar milk protein content regardless of fat supplementation. Milk protein yields were higher (P<.01) for S diets. The S diets decreased (P<.03) milk fat percentages but yields were not affected. The S diets had higher (P<.01) digestibilities for DM, CP, GE, and starch than D diets. Digestibilities of CP and GE were higher (P<.05) for F than C diets. Steam flaked sorghum grain maintained milk protein percent in lactation diets supplemented with Ca-Soaps of fatty acids.
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 Tal

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleLactational performance and nutrient utilization in high producing cows fed sorghum grains of varying starch degradabilities with or without fat supplementationen_US
dc.creatorSimas, Jose Manuel Correia de, 1967-en_US
dc.contributor.authorSimas, Jose Manuel Correia de, 1967-en_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.abstractTwenty-four multiparous and twelve primiparous Holstein cows were assigned at calving to four treatments in a 2 x 2 factorial design. Factors were: (1) grain processing: dry rolled sorghum (D) vs. steam flaked sorghum (S); (2) rumen inert fat: supplemented (F) vs. non supplemented (C). The F diets were supplemented at 2.5% of dry matter (DM) as Ca-soaps. The S diets increased (P<.02) milk production 12%, while F diets decreased (P<.28) milk 5%, due to a 16% decrease (P<.01) in feed intake. However, F diets increased (P<.01) efficiency of feed utilization 15%, partially sustained by greater (P<.08) body weight losses. The DF diet decreased milk protein 0.21% compared to the DC diet, but the S diets had similar milk protein content regardless of fat supplementation. Milk protein yields were higher (P<.01) for S diets. The S diets decreased (P<.03) milk fat percentages but yields were not affected. The S diets had higher (P<.01) digestibilities for DM, CP, GE, and starch than D diets. Digestibilities of CP and GE were higher (P<.05) for F than C diets. Steam flaked sorghum grain maintained milk protein percent in lactation diets supplemented with Ca-Soaps of fatty acids.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 Talen_US
dc.identifier.proquest1349466en_US
dc.identifier.bibrecord.b27693028en_US
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