[Rumen fermentation and digestibility of nutrients studied by the addition of Ca soaps of palm oil fatty acids and their analogous fatty acids in the sheep model].
The ruminally fistulated sheep was used as a model to study the effects of fat supplementation (Ca-soaps and free long chain fatty acids from palm oil) on rumen physiology and digestibility of the nutrients. The animals were fed with a typical ration of hay and concentrate supplying nutrients according to maintenance levels. The following results should be pointed out: The addition of free fatty acids and their Ca-soaps induced a retarded recovery of postprandially decreased pH-values in ruminal fluid. This retardation was more pronounced after addition of free long chain fatty acids than with their Ca-soap-analogous acids. Compared to the control, the concentration of short chain fatty acids was depressed by fat addition in the period 2 hours after feed intake. The release of ammonia in the first period after feed intake was reduced by fat addition. A lack of synchronity could be observed in this post-prandial period in ruminal fluid between concentration of short chain fatty acids and ammonia. This effect was most obvious with supplementation of unprotected fatty acids. This might be one reason for the better tolerance of Ca soaps from palm oil fatty acids. Formation of hydrides, branched chains and transforms proceeds more effectively with free fatty acids than with their analogous forms of Ca-soaps. The well-known effect of depression of digestibility of nutrients due to fat supplementation was--under present conditions--quite low. This might be different in lactating dairy cows with higher levels of feed intake. With high feed intake, passage time is reduced. This will affect digestibility and interactions with fat supplementation.
Drochner
W
W
Institut für Tierernährung der Universität Hohenheim.
Yildiz
G
G
D000818:Animals; D002118:Calcium; D004042:Dietary Fats, Unsaturated / Q000378:metabolism*; D004063:Digestion / Q000502:physiology*; D005230:Fatty Acids, Nonesterified / Q000378:metabolism*; D005285:Fermentation; D008297:Male; D000073878:Palm Oil; D010938:Plant Oils / Q000378:metabolism*; D012417:Rumen / Q000502:physiology* / Q000601:surgery; D012756:Sheep
D004042:Dietary Fats, Unsaturated; D005230:Fatty Acids, Nonesterified; D010938:Plant Oils; D000073878:Palm Oil; D002118:Calcium