Dietary protein quality and quantity affect lactational responses to corn distillers grains: A meta-analysis
| Autor: | Michael S. Allen, M. Hollmann, D.K. Beede |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
congenital
hereditary and neonatal diseases and abnormalities Zea mays Distillers grains Milk yield Lactation Genetics medicine Animals Dry matter Food science Randomized Controlled Trials as Topic Milk protein Chemistry digestive oral and skin physiology food and beverages Milk Proteins Diet Milk Dietary protein medicine.anatomical_structure Animal Nutritional Physiological Phenomena Cattle Female Animal Science and Zoology Dietary Proteins Edible Grain Protein concentration Protein quality Food Science |
| Zdroj: | Journal of Dairy Science. 94:2022-2030 |
| ISSN: | 0022-0302 |
| DOI: | 10.3168/jds.2010-3712 |
| Popis: | Diet fermentability influences lactational responses to feeding corn distillers grains (CDG) to dairy cows. However, some measures of diet fermentability are inherently related to the concentration and characteristics of corn-based ingredients in the ration. Corn-based feeds have poor protein quality, unable to meet the essential AA requirements of lactating cows. We conducted a meta-analysis of treatment means (n = 44) from the scientific literature to evaluate responses in milk yield (MY) and milk true protein concentration and yield to dietary CDG. The test variable was the difference in response between the CDG diet mean and the control diet mean (0% CDG) within experiment. Fixed variables were CDG concentration of the diet [% of dietary dry matter (DM)] and crude protein (CP) concentration and fractions of CP based on origin (corn-based versus non-corn-based feeds) of control and CDG diets. Diets with CDG ranged from 4 to 42% CDG, DM basis. Non-corn-based dietary CP averaged 6.3 ± 3.32% of total DM. Milk yield and milk true protein yield responses to added CDG were maximized when approximately 8.5% of the total dietary DM was non-corn-based CP. Milk yield response peaked for higher-producing cows (>30.0 kg MY/cow per day) at 4.3% dietary corn-based CP, but decreased linearly for lower-producing cows ( |
| Databáze: | OpenAIRE |
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