Effect of forage type and proportion of concentrate in the diet on milk fatty acid composition in cows given sunflower oil and fish oil
| العنوان: | Effect of forage type and proportion of concentrate in the diet on milk fatty acid composition in cows given sunflower oil and fish oil |
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| المؤلفون: | Kevin J. Shingfield, Vesa Toivonen, Alistair S. Grandison, Martin P. Yurawecz, David E. Beever, Pierluigi Delmonte, B. Lupoli, J. M. Griinari, Christopher K. Reynolds |
| المصدر: | Animal Science. 80:225-238 |
| بيانات النشر: | Cambridge University Press (CUP), 2005. |
| سنة النشر: | 2005 |
| مصطلحات موضوعية: | food.ingredient, Silage, Linoleic acid, Conjugated linoleic acid, Total mixed ration, 03 medical and health sciences, chemistry.chemical_compound, Animal science, food, Lactation, medicine, Food science, 030304 developmental biology, 2. Zero hunger, chemistry.chemical_classification, 0303 health sciences, Chemistry, Sunflower oil, 0402 animal and dairy science, food and beverages, 04 agricultural and veterinary sciences, Fish oil, 040201 dairy & animal science, medicine.anatomical_structure, Animal Science and Zoology, Polyunsaturated fatty acid |
| الوصف: | Based on the potential benefits ofcis-9,trans-11 conjugated linoleic acid (CLA) for human health there is a need to develop effective strategies for enhancing milk fat CLA concentrations. In this experiment, the effect of forage type and level of concentrate in the diet on milk fatty acid composition was examined in cows given a mixture of fish oil and sunflower oil. Four late lactation Holstein-British Friesian cows were used in a 4 × 4 Latin-square experiment with a 2 × 2 factorial arrangement of treatments and 21-day experimental periods. Treatments consisted of grass (G) or maize (M) silage supplemented with low (L) or high (H) levels of concentrates (65 : 35 and 35 : 65; forage : concentrate ratio, on a dry matter (DM) basis, respectively) offered as a total mixed ration at a restricted level of intake (20 kg DM per day). Lipid supplements (30 g/kg DM) containing fish oil and sunflower oil (2 : 3 w/w) were offered during the last 14 days of each experimental period. Treatments had no effect on total DM intake, milk yield, milk constituent output or milk fat content, but milk protein concentrations were lower (P< 0.05) for G than M diets (mean 43.0 and 47.3 g/kg, respectively). Compared with grass silage, milk fat contained higher (P< 0.05) amounts of C12:0, C14:0, trans C18:1and long chain ≥ C20 (n-3) polyunsaturated fatty acids (PUFA) and lower (P< 0.05) levels of C18:0and trans C18:2when maize silage was offered. Increases in the proportion of concentrate in the diet elevated (P< 0.05) C18:2(n-6) and long chain ≥ C20 (n-3) PUFA content, but reduced (P< 0.05) the amount of C18:3(n-3). Concentrations oftrans-11 C18:1in milk were independent of forage type, but tended (P< 0.10) to be lower for high concentrate diets (mean 7.2 and 4.0 g/100 g fatty acids, for L and H respectively). Concentrations oftrans-10 C18:1were higher (P< 0.05) in milk from maize compared with grass silage (mean 10.3 and 4.1 g/100 g fatty acids, respectively) and increased in response to high levels of concentrates in the diet (mean 4.1 and 10.3 g/100 g fatty acids, for L and H, respectively). Forage type had no effect (P> 0.05) on total milk conjugated linoleic acid (CLA) (2.7 and 2.8 g/100 g fatty acids, for M and G, respectively) orcis-9,trans-11 CLA content (2.2 and 2.4 g/100 g fatty acids). Feeding high concentrate diets tended (P< 0.10) to decrease total CLA (3.3 and 2.2 g/100 g fatty acids, for L and H, respectively) andcis-9,trans-11 CLA (2.9 and 1.7 g/100 g fatty acids) concentrations and increase milktrans-9,cis-11 CLA andtrans-10,cis-12 CLA content. In conclusion, the basal diet is an important determinant of milk fatty acid composition when a supplement of fish oil and sunflower oil is given. |
| تدمد: | 1748-748X 1357-7298 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::9ea6333c0caeba016a8abab0c0f7c0f3 https://doi.org/10.1079/asc41820225 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........9ea6333c0caeba016a8abab0c0f7c0f3 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 1748748X 13577298 |
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