Influence on milk protein percentage of isocaloric infusions of glucose in the rumen, or propionate and acetate in the duodenum of cows fed dry rolled sorghum

Persistent Link:
http://hdl.handle.net/10150/282163
Title:
Influence on milk protein percentage of isocaloric infusions of glucose in the rumen, or propionate and acetate in the duodenum of cows fed dry rolled sorghum
Author:
Aquino-Ramos, Jorge Luis, 1961-
Issue Date:
1996
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:
Experiments were conducted to elucidate mechanisms of increased milk protein percentage in cows fed diets containing steam flaked (SFS) vs dry rolled (DRS) sorghum grains. In experiment 1 treatments were: DRS diet plus duodenal infusion of 30% sodium acetate (DA), or SFS diet plus duodenal water infusion (SFS). In the experiment 2 the DRS diet plus duodenal infusion of 23% sodium propionate (DP), was compared with the DRS diet plus ruminal infusion of 21% glucose (RG). Sorghum was 35% of DM in all diets and infusates were 5L/d. The SFS diet tended (P .19) to increase milk protein content and decrease ruminal pH. The DA infusion increased FCM, and tended to increase fat% and yield. The RG infusion increased milk protein percent and decreased ruminal pH, and the DP infusion tended to decrease DMI. In experiment 3 treatments were: (1) SFS, (2) DA, and (3) RG. Diets and infused amounts were similar to previous trials. No parameters was affected by treatment, but milk protein percent, yield of milk and milk protein were numerically higher SFS than DA, similar to the previous study. Milk composition and production for cows fed DRS plus RG were the same as for cows fed SFS. An in situ trial was conducted to better characterize ruminal starch degradation. The same (DRS and SFS) diets were used as in infusions trials. Treatments were divided into diets and grains as follows: (1) diet DRS, (2) diet SFS, (3) grain DRS, and (4) grain SFS. Material for incubation was ground to pass a 2 mm screen and placed in the rumen for 2, 4, 8, 12, 24 and 48h. DM degradability was not affected by treatment. Starch degradability at 4, 8 and 12h and were higher for the SFS than for DRS diets or grains. In situ data support the infusion data which of higher ruminal starch degradability with SFS than DRS. The studies suggest that increased milk protein content resulting from feeding SFS compared with DRS relates more to increased ruminal starch fermentability (as stimulated by RG) than to greater absorption of acetate or propionate.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Agriculture, Animal Culture and Nutrition.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Graduate College; Animal Science
Degree Grantor:
University of Arizona
Advisor:
Huber, J. T.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleInfluence on milk protein percentage of isocaloric infusions of glucose in the rumen, or propionate and acetate in the duodenum of cows fed dry rolled sorghumen_US
dc.creatorAquino-Ramos, Jorge Luis, 1961-en_US
dc.contributor.authorAquino-Ramos, Jorge Luis, 1961-en_US
dc.date.issued1996en_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.abstractExperiments were conducted to elucidate mechanisms of increased milk protein percentage in cows fed diets containing steam flaked (SFS) vs dry rolled (DRS) sorghum grains. In experiment 1 treatments were: DRS diet plus duodenal infusion of 30% sodium acetate (DA), or SFS diet plus duodenal water infusion (SFS). In the experiment 2 the DRS diet plus duodenal infusion of 23% sodium propionate (DP), was compared with the DRS diet plus ruminal infusion of 21% glucose (RG). Sorghum was 35% of DM in all diets and infusates were 5L/d. The SFS diet tended (P .19) to increase milk protein content and decrease ruminal pH. The DA infusion increased FCM, and tended to increase fat% and yield. The RG infusion increased milk protein percent and decreased ruminal pH, and the DP infusion tended to decrease DMI. In experiment 3 treatments were: (1) SFS, (2) DA, and (3) RG. Diets and infused amounts were similar to previous trials. No parameters was affected by treatment, but milk protein percent, yield of milk and milk protein were numerically higher SFS than DA, similar to the previous study. Milk composition and production for cows fed DRS plus RG were the same as for cows fed SFS. An in situ trial was conducted to better characterize ruminal starch degradation. The same (DRS and SFS) diets were used as in infusions trials. Treatments were divided into diets and grains as follows: (1) diet DRS, (2) diet SFS, (3) grain DRS, and (4) grain SFS. Material for incubation was ground to pass a 2 mm screen and placed in the rumen for 2, 4, 8, 12, 24 and 48h. DM degradability was not affected by treatment. Starch degradability at 4, 8 and 12h and were higher for the SFS than for DRS diets or grains. In situ data support the infusion data which of higher ruminal starch degradability with SFS than DRS. The studies suggest that increased milk protein content resulting from feeding SFS compared with DRS relates more to increased ruminal starch fermentability (as stimulated by RG) than to greater absorption of acetate or propionate.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectAgriculture, Animal Culture and Nutrition.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineAnimal Scienceen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorHuber, J. T.en_US
dc.identifier.proquest9713396en_US
dc.identifier.bibrecord.b34396093en_US
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