Abstract
Changes in the fatty acid composition of blood serum and liver from 28 beef calves were studied from birth to approximately 8 and 12 wk, respectively. The calves (purebred Shorthorn) were born from 14 cows fed alfalfa hay (group 1) and from 14 cows fed oat hay (group 2). The data indicate a pronounced effect of the dietary fat, with liver and serum of group 2 calves containing a higher proportion of C18:1 and C18:2 fatty acids than those of group 1. The serum of group 1 calves had higher proportions of C12:0, C14:0, C14:1, C15:0, C17:0, C18:3, and C20:1 than group 2. The proportion of C18:2 and C18:3 in the serum of both groups increased from birth until the calves were about 21 days of age, whereas the proportion of C18:1 declined during the same period. Proportionately more C17:1 and less C12:0 were found in the serum of the nondystrophic calves than those affected with nutritional muscular dystrophy. There was also a significant interaction between the nutritional muscular dystrophy incidence and the diet of calves for the C16:0, C18:2, and C18:3 fatty acids of serum. However, no such difference was found for the liver, which contained proportionally the highest concentrations of C18:0 compared with other fatty acids. In liver, high concentrations of the C16:0 and C18:1 acids were also found and appreciable levels of the C20 series.
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