Effect of feeding rolled flaxseed on milk fatty acid profiles and reproductive performance of dairy cows1
| Autor: | R. D. Shaver, J. W. Schroeder, K. A. Vonnahme, N. R. Bork, Marc L Bauer, Paul M. Fricke, G. P. Lardy, D. S. Buchanan |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
chemistry.chemical_classification
Animal fat Protein–energy malnutrition Linolenic acid media_common.quotation_subject food and beverages Fatty acid General Medicine Biology medicine.disease chemistry Essential fatty acid Genetics medicine Animal Science and Zoology Food science Reproduction Dairy cattle Food Science Polyunsaturated fatty acid media_common |
| Zdroj: | Journal of Animal Science. 88:3739-3748 |
| ISSN: | 1525-3163 0021-8812 |
| DOI: | 10.2527/jas.2010-2841 |
| Popis: | The objectives were to study the ef- fects of feeding rolled flaxseed (FLX) to early-lactation dairy cows on milk yield, milk components, and milk fatty acid profiles as well as on measures of cow re- production. Lactating Holstein cows, on 3 commercial dairies, were fed either an early-lactation ration (CON) or a ration that was similar in protein, energy, and fat content but that included FLX (0.85 kg of DM/ cow per day). Within each dairy, cows were allocated alternately to breeding pens upon leaving the fresh pen (approximately 10 ± 5 d postpartum). Pens (n = 4 to 5 pens/dairy) were randomized to treatment (n = 2 to 3 pens/treatment per dairy). Pen (CON, n = 6; FLX, n = 7) was considered the experimental unit and data were analyzed as a split plot with pen as the whole-plot error term. Cows fed FLX had greater (P ≤ 0.06) pro- portions of cis-9, trans-11 C18:2, C18:3n-3, and C20:0 fatty acids in milk fat and a lesser (P = 0.03) propor- tion of C20:3n-6 fatty acid when compared with cows fed the CON diet. Treatment did not affect (P ≥ 0.24) milk yield, milk protein, protein yield, milk fat, or milk fat yield. No interactions (P ≥ 0.52) were found be- tween treatment and season of the year or parity, or be- tween treatment and days open, pregnancies per AI at first or second service, or pregnancy loss. In conclusion, feeding FLX at 0.85 kg/cow per day (DM basis) altered the fatty acid profile of milk, but milk yield, milk com- position, and reproductive performance of dairy cows were not affected. |
| Databáze: | OpenAIRE |
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