Relationships between End Products of Rumen Fermentation and Utilization of Metabolizable Energy for Milk Production
| Autor: | L.A. Moore, W.E. Stewart, C.E. Coppock, W.P. Flatt |
|---|---|
| Rok vydání: | 1964 |
| Předmět: |
chemistry.chemical_classification
digestive oral and skin physiology Soybean meal food and beverages Fatty acid Butyric acid Acetic acid chemistry.chemical_compound Rumen medicine.anatomical_structure chemistry Lactation Genetics medicine Hay Animal Science and Zoology Fermentation Food science Food Science |
| Zdroj: | Journal of Dairy Science. 47:1359-1364 |
| ISSN: | 0022-0302 |
| DOI: | 10.3168/jds.s0022-0302(64)88918-9 |
| Popis: | Summary Three rations in which the proportion of estimated net energy (ENE) derived from hay or a concentrate mixture of corn meal and soybean meal was varied from 50% hay–50% concentrate (Ration A) to 75% hay–25% concentrate (Ration B) or 100% hay (Ration C) were fed to six, mature, lactating Holstein cows. The end products of rumen fermentation (total methane production and molar proportions of volatile fatty acids in the rumen) were studied in relation to lactation efficiency. Indirect calorimetry was used to measure the efficiency of utilization of metabolizable energy (ME). The molar proportion of acetic acid present in the rumen declined from 71.4 to 65.3% (P The proportions of digestible carbohydrates calculated to be fermented, using a theoretical fermentation balance equation proposed by Wolin, were 86, 84, and 81% for Rations A, B, and C, respectively. The simple correlations between volatile fatty acid (VFA) proportions and lactation efficiency were: r = −0.73 for acetic acid, +0.43 for propionic acid, and +0.67 for butyric acid (P |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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