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.)
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/278030 |
| Date | January 1991 |
| Creators | Chen, Kai Hang, 1965- |
| Contributors | Huber, John T. |
| Publisher | The University of Arizona. |
| Source Sets | University of Arizona |
| Language | en_US |
| Detected Language | English |
| Type | text, Thesis-Reproduction (electronic) |
| 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. |
Page generated in 0.002 seconds