Performance and body fat composition of fattening bulls fed diets with evening primrose (<i>Oenothera paradoxa</i>) oil cake

Abstract

An experiment was carried out on 30 Black-and-White Lowland bulls fattened from 165 to 485 kg BW, divided into three groups fed diets without evening primrose oil cake (control group C) or with a contribution of 10 (group PI) or 30% (group P2) of evening primrose cake. Bull performance, nutrient digestibility, nitrogen balance, ammonia and volatile fatty acids in the rumen fluid, physicochemical properties of meat and subcutaneous and kidney fat composition were estimated. Average daily body gain was 1333 g in group PI; 1235 g in P2; and 1216 g in C. The content of oleic (C 18 .,) and linoleic (C, 8 . 2n6 ) acid in subcutaneous and kidney fat was higher in bulls fed diets with evening primrose oil cake than in controls.

Performance and meat quality of fattening bulls fed complete feed with rapeseed oil cake or linseed

“…Strzetelski et al (1992) found that feeding fattening bulls ad libitum with complete mixtures containing 15 or 30% rape seed did not decrease dry matter intake compared with the control group. Similar results were obtained by other authors feeding fattening bulls different rations containing different sources and levels of vegetable or fish oils (Rule et al, 1994;Kreuzer et al, 1995;Scollan et al, 1997b;Strzetelski et al, 1998a;Choi et al, 1999). In other experiments, feeding diets containing linseed, sunflower or soyabean seed decreased dry matter intake (e.g.…”

“…Fatty acid composition from C 14 to C 20 in fat and from C 14 to C 22 in meat were determined by gas chromatography (Pay Unicam 104) using a 30 m long Supelcowax 10 column ((|) = 0.53 mm), cholesterol was deter-mined using GC Pye Unicam 106 equipment with a 10 m long HP-5 column ((() = 0.53 mm). The physical and chemical properties of meat were estimated as described by Strzetelski et al (1998a). The nutrient content in feeds was determined according to AO AC (1990) methods.…”

“…Addition of vegetable unsaturated oils leads to higher polyunsaturated fatty acid contents in meat fat (Chilliard, 1992;Clinquart et al, 1995;Strzetelski et al, 1998a). Despite the polyunsaturated fatty acids of feeds undergoing biohydrogenation in the rumen, their content in meat fat usually increases (Scollan et al, 1997a).…”

Fattening bulls on maize silage and concentrate supplemented with vegetable oils

“…longissimus dors/were taken for fatty acids analysis in extracted fat by gas chromatography on Pye Unicam GC104 equipment using a 30 m long Supelcowax 10 column (f=0.53 mm), and cholesterol estimation on Pye Unicam GC106 using a 30 m long (f=0.53 mm) HP5 column. The physical and chemical properties of meat were estimated as described by Strzetelski et al (1998). Nutrient content in feeds was determined according to AO AC (1990) methods.…”