title: Investigations on the effects of Ca-soap of linseed oil on rumen fermentation in sheep and on milk composition of goats.
abstract: Six rumen-cannulated wethers were fed by a diet composed of alfalfa hay and concentrate and supplemented by 75 g Ca-soap of linseed oil (5.4% in dry matter, DM) daily. A model trial was performed to detect the effects of the Ca-soap on rumen fermentation parameters and on fibre digestion. Approximately 3 h after feeding Ca-soap, ratio of C2:C3 decreased (from 4.33 to 4.02) and the production of i- and n-butyrate and i- and n-valeriate increased by 28, 5.3, 11.76% and 6.80% respectively. Total volatile fatty acid concentration in rumen fluid did not change (126.1 vs. 126.4 mm) as a result of Ca-soap supplementation. The in vitro trial showed no detrimental influence of Ca-soap on the acid detergent fibre (ADF) degradation. Using feed samples containing Ca-soap to be incubated in tubes, ADF digestion proved to be significantly higher (p < 0.001). Approximately 14 goats (Saanen breed, 30-70 days in lactation) were used to test the effects of Ca-soap on milk composition. Their ration contained alfalfa hay, millet straw and a concentrate. In the experimental group (seven goats) the diet was supplemented with Ca-soap of linseed oil (75 g/animal/day). The milk composition was changed (slightly reduced solid content, sometimes significantly reduced milk fat contents), when Ca-soap was included in the diet of lactating goats.
authors.affiliation: Department of Animal Breeding, Animal Nutrition and Sciences of Laboratory Animals, Faculty of Veterinary Sciences, Szent István University, István Str. 2 H-1078 Budapest, Hungary. ecenkvar@univet.hu
authors.forename: E
authors.initials: E
authors.lastname: Cenkvári
authors.forename: S
authors.initials: S
authors.lastname: Fekete
authors.forename: H
authors.initials: H
authors.lastname: Fébel
authors.forename: T
authors.initials: T
authors.lastname: Veresegyházi
authors.forename: E
authors.initials: E
authors.lastname: Andrásofszky
mesh_terms: D000818:Animals; D002118:Calcium / Q000008:administration & dosage*; D004043:Dietary Fiber / Q000378:metabolism; D004063:Digestion / Q000187:drug effects / Q000502:physiology; D005232:Fatty Acids, Volatile / Q000378:metabolism; D005260:Female; D005285:Fermentation; D006041:Goats / Q000378:metabolism* / Q000502:physiology; D007774:Lactation / Q000378:metabolism; D008043:Linseed Oil; D008297:Male; D008892:Milk / Q000737:chemistry* / Q000378:metabolism; D012417:Rumen / Q000378:metabolism*; D012756:Sheep / Q000378:metabolism*
chemical_list: D004043:Dietary Fiber; D005232:Fatty Acids, Volatile; D008043:Linseed Oil; D002118:Calcium