Effect of linseed oil fatty acid calcium salts and vitamin E on milk yield and composition

Abstract

Eight Holstein Red-and-White cows were used in two squares of a 4 x 4 Latin square design experiment and fed for 84 days (weeks 4-16 of lactation) with Ca salts of fatty acids (CaSFA) of linseed oil and animal fat. Experimental diets contained 0, 3, 6 and 9% CaSFA (on DM basis) and vitamin E at doses of 40 and 168 mg kg" 1 DM of concentrate (DM). Cows were fed grass silage and 0.280 kg of concentrate per kg of milk. Average FCM yield was 24.0±0.5 kg/d A with 40.0±0.7 and 31.2±0.3 g/kg" 1 fat and protein, respectively. No significant effects of CaSFA or vitamin E on feed intake, milk yield, milk fat, protein or lactose contents were received. A tendency towards decreasing protein and increasing milk fat content was observed at a 9% CaSFA in the diet. The addition of CaSFA significantly (P>0.01) elevated UFA (78.07 to 67.06 g/100 g), MUFA (19.44 to 29.18 g/100 g), and PUFA (2.49 to 3.76 g/100 g). DFA (a hypocholesterolemic acid) in milk was increased from 29.35 to 42.59 g/100 g (PO.01) but total cholesterol decreased from 10.43 to 10.02 mg/100 ml of milk (P>0.05). CaSFA from linseed oil and animal fat significantly decreased the concentration of C in , C,,and C,, acids, but slightly increased the concentration of C

Effect of fatty acid calcium salts from linseed oil on the yield and n-3 fatty acid content of milk and on blood plasma parameters of cows

“…Most studies have found that dietary fat supplements, by increasing the amount of fat or leaving it unchanged, decrease the protein content, especially when the fat supplements in the diet exceed 2-2.5% of dry matter Brzóska et al, 1999). Similar results were obtained after duodenal infusion of fatty acids (Romo et al, 2000).…”

“…The data obtained indicate that giving cows 316, 614 or 940 g of CSFA results in a surplus of dietary energy intake compared with the energy secreted in milk, leading to increased body weight. The reaction of cows to the source of dietary fat is a typical response confirmed in many experiments using CSFA in dairy cow nutrition (Aii et al, 1991;Chouinard et al, 1997;Brzóska et al, 1999). Analysis of the cows' plasma showed a typical reaction to the supplement of unsaturated dietary fat, consisting in a significant increase in the level of plasma triglycerides and a decrease in the levels of total and HDL cholesterol.…”

“…The efficiency of plant oils and CSFA in cow nutrition has been addressed in a number of studies (e.g., Hagemeister et al, 1988;Aii et al, 1991;Nowak and Potkański, 1997;Brzóska et al, 1999). CSFA obtained from linseed oil carry a large load of UFA, including n-3 UFA.…”

“…The dry matter, basic nutrient, calcium and phosphorus content of the feeds was determined according to AOAC (1994). Dry matter was assayed at 105°C, and the dry mater content of silages was adjusted for the level of volatile substances (Brzóska et al, 1999). The nutritive value of the feeds and diets was calculated using WINWAR software.…”

“…In an earlier study, cows were fed CSFA obtained from 50% technical fat of animal origin and 50% linseed oil, with a small supplement of fish oil (Brzóska et al, 1999). The ban on the use of animal fats in feeding cattle encouraged us to investigate feeding cows CSFA obtained from linseed oil only.…”