The Influence of Level of Fat and Energy in the Ration upon Feedlot Performance and Carcass Composition of Fattening Steers

Willey, N. B.; Riggs, J. K.; Colby, R. W.; Butler, O. D.; Reiser, Raymond

doi:10.2527/jas1952.114705x

Cited by 31 publications

(5 citation statements)

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“…For example, Roberts and McKirdy (1964) obtained higher improvements in daily gain and FCE with a 50 g/kg sunflower oil supplement than with a rapeseed oil supplement when added to barleybased diets. A 50 g/kg cottonseed oil supplement improved FCE but did not change the daily gain in the study of Willey, Riggs, Colby, Butler and Reiser (1952).…”

Section: Discussionmentioning

confidence: 86%

Effects on animal performance and fat composition of two fat concentrates in diets for growing-fattening bulls

et al. 1991

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Two experiments were carried out with growing-fattening bulls, offered a fattening diet based on concentrate and supplemented with soya oil or steam-flaked linseed. Soya oil (200 g/kg) was mixed with middlings (800 g/kg). Linseed (500 g/kg) and whole barley (500 g/kg) were steam flaked. The fat incorporation resulted in an increase of the ether extract content from 26·5 g/kg dry matter to about 45 g/kg. The incorporation of soya oil increased the average daily gain (P> 0·05). The saturated: unsaturated fatty acid ratio was reduced in perirenal fat due to an increase of oleic acid and a reduction of stearic acid. The inclusion of steam-treated linseed resulted in a lower slaughter weight (P< 0·05) and a shorter fattening period (P> 0·05). The fatty acid composition of perirenal fat was affected significantly: the concentrations of oleic, linoleic and linolenic acid were increased and the concentrations of myristic, palmitic and stearic acids were reduced. This resulted in a reduced saturated: unsaturated fatty acid ratio.In a third experiment, samples of the two fat concentrates were incubated in nylon bags in the rumen. The ether extract disappearance was high with both concentrates. Furthermore, the fatty acid composition was altered to a large extent for soya oil while large proportions of unsaturated fatty acids were still present with steam-flaked linseed.

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Section: Discussionmentioning

confidence: 86%

Effects on animal performance and fat composition of two fat concentrates in diets for growing-fattening bulls

et al. 1991

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“…Stearic acid is the final product of hydrogenation of the C18 unsaturated fatty acids (oleic acid, linoleic acid and linolenic acid) of which the lipids of pasture grasses and other herbage are rich sources (Weenink, 1959(Weenink, , 1961Garton, 1960b). It has also been demonstrated that the feeding to oxen and goats of oils having a high content of C18 unsaturated fatty acids (linseed oil, cottonseed oil) leads to the deposition of enhanced amounts of stearic acid in the depot fats (Wiley, Riggs, Colby, Butler & Reiser, 1952;Reiser & Reddy, 1956). Further, when linseed oil was given to a sheep via a duodenal cannula, thereby by-passing the rumen, Ogilvie, McClymont & Shorland (1961) found that the perinephric fat contained much more linoleic acid and linolenic acid than are normally found in sheep depot fat, thus supporting the indirect evidence that the high stearic acid content of ruminant tissue lipids results from the intestinal absorption and subsequent assimilation of stearic acid produced in the rumen by microbial hydrogenation of unsaturated C18 fatty acids.…”

Section: Lipids Of Sheep Lymphmentioning

confidence: 99%

Lipids of sheep lymph. Transport from the intestine

Felinski¹,

Garton²,

Lough³

et al. 1964

Biochemical Journal

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“…As a result of the observation of Willey, Riggs, Colby, Butler & Reiser (1952) that the depot fats of steers feed on cottonseed oil contained more stearic acid than the controls, R. Reiser (private communication) suggested that the high content of stearic acid in the depot fats of ruminants was due to the hydrogenation of dietary C18 unsaturated acids in the rumen. This suggestion was further supportedc by Shorland, Weenink & Johns (1955), who showed that whereas linolenic acid was the main component of pasture lipids, in pasture-fed sheep the rumen contents contained stearic acid as the main lipid constituent.…”

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confidence: 99%