Effects of dietary sources of vegetable fats on performance of dairy ewes and conjugated linoleic acid (CLA) in milk

Castro, Teresa Gontijo de; Manso, Teresa; Jimeno, V.; Álamo, M. del; Mantecón, Ángel R.

doi:10.1016/j.smallrumres.2009.05.005

Cited by 65 publications

(73 citation statements)

References 47 publications

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“…The more evident increase when RS was supplemented might result from its higher linoleic acid content in comparison with LS. Also in experiments by Castro et al (2009) the supplementation of soybean oil, rich in linoleic acid, to ewe diets increased the C18:2 c9 t11 CLA content by 29% in comparison with the control diet. Milk from ewes fed the sunflower seed diet contained more C18:2 c9 t11 CLA and less C18:3 c9 c12 c15 than milk from ewes fed the flaxseed diet (source of linolenic acid) (Zhang et al, 2006).…”

Section: Discussionmentioning

confidence: 93%

Enhancing unsaturated fatty acids in ewe's milk by feeding rapeseed or linseed oil

Cieślak¹,

Kowalczyk²,

Czauderna³

et al. 2010

Czech J. Anim. Sci.

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The aim of our research was to evaluate whether rapeseed and linseed oils used as feed additives to ewe's diets allow to achieve the higher secretion of unsaturated fatty acids into milk with extended emphasis on the conjugated linoleic acid concentration. Two experiments were carried out on 6 lactating ewes in two independent 3 × 3 Latin square designs. In each feeding cycle the animals were subjected to one of the treatments: (1) without oil supplementation, (2) with 3.5% of rapeseed oil (RS) or linseed oil (LS), (3) with 7.0% of rapeseed oil or linseed oil. Feeding diets rich in mono- and polyunsaturated fatty acids to lactating ewes under our experimental conditions resulted in demanded changes in milk fatty acid content without causing milk fat depression or modification of other milk constituents. Milk fat was improved in unsaturated fatty acids including C18:2 c9 t11 CLA isomer without changing the milk fat concentration. The C18:2 c9 t11 concentration increased from 0.03 (FAME, %) in the control group to 0.21 and 0.12 (FAME, %) in groups receiving 3.5 and 7% RS, respectively. The diet with 7% LS also elevated the C18:2 c9 t11 level in milk from 0.04 (FAME, %) in the control group to 0.11 (FAME, %). Hence a conclusion is drawn that plant oils may be an important source of monoenic and also polyenic fatty acids in milk, however, our research and analysis of literature data indicate that results are strictly dietary and supplement-dependent.

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Section: Discussionmentioning

confidence: 93%

Enhancing unsaturated fatty acids in ewe's milk by feeding rapeseed or linseed oil

Cieślak¹,

Kowalczyk²,

Czauderna³

et al. 2010

Czech J. Anim. Sci.

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“…The inclusion of OLI, SOY and LIN increased the 18:0 content of the milk when compared with milk from PALM-fed ewes. This change results from the increased amounts of different C18 unsaturated fatty acids supplied by the oils, which can be completely hydrogenated in the rumen to 18:0 (Dhiman et al, 2000;Castro et al, 2009). The oil given to PALM-fed ewes has greater levels of 16:0 than the other oils, which is reflected in the composition of their milk .…”

Section: Discussionmentioning

confidence: 99%

“…According to previous research, SOY-fed ewes displayed a nearly five-fold higher proportion of cis-9, trans-11 CLA than PALM-fed animals. A decrease in medium-chain FAs (C12 to C16) and SFA was also observed, and de novo synthesis of SFA may have been inhibited by the presence of long-chain FAs in the diet (Bouattour et al, 2008;Gó mez-Cortes et al, 2008b;Castro et al, 2009). Using SOY in feed has been proposed as an alternative for producing milk and dairy products enriched in MUFA, cis-9, trans-11 CLA and trans-11 18:1 (Bouattour et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Feeding vegetable oils to lactating ewes modifies the fatty acid profile of suckling lambs

Manso

Bodas

Vieira

et al. 2011

Animal

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The objective of this study was to evaluate the effects of vegetable oil supplementation of ewe diets on the performance and fatty acid (FA) composition of their suckling lambs. Forty-eight pregnant Churra ewes (mean BW 64.3 6 0.92 kg) with their 72 newborn lambs (prolificacy 5 1.5) were assigned to one of four experimental diets, supplemented with 3% of hydrogenated palm (PALM), olive (OLI), soya (SOY) or linseed (LIN) oil. Lambs were nourished exclusively by suckling from their respective mothers. Ewes were milked once daily, and milk samples were taken once a week. When lambs reached 11 kg, they were slaughtered and samples were taken from musculus longissimus dorsi (intramuscular fat) and subcutaneous fat tissue. No changes were observed in milk yield, proximal composition or lamb performance (P . 0.10). Milk and lamb subcutaneous and intramuscular fat samples from the PALM diet had the highest saturated fatty acid concentration, whereas those of the OLI, SOY and LIN diets had the lowest (P , 0.05). The greatest monounsaturated fatty acid concentration was observed in milk from ewes fed OLI, and the least in milk and in lamb subcutaneous and intramuscular fat samples from LIN and PALM diets. Milk and lamb fat from ewes fed PALM displayed the highest 16:0 proportion and the lowest 18:0 (P , 0.05). There were higher concentrations of cis-9 18:1 in OLI samples (P , 0.05), more 18:2n-6 in SOY lambs and milk fat (P , 0.001) and the highest levels of 18:3n-3 and 20:5n-3 in LIN samples (P , 0.01). Milk and lamb subcutaneous and intramuscular samples from SOY and LIN diets contained the most cis-9, trans-11 conjugated linoleic acid, whereas PALM samples had the least (P , 0.01). Sheep diet supplementation with different oils, constituting up to 3% of their diets, resulted in changes in the FA composition of milk and the subcutaneous and intramuscular fat of suckling lambs, but did not affect either milk production or lamb performance.

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“…However, recent research in dairy ewes (Gómez-Cortés et al, 2008;Castro et al, 2009) and steers (Ludden et al, 2009) has shown that diets supplemented with moderate amounts of unprotected oils modify the FA profile of milk and meat without adverse effects on digestion and animal performance. Hydrogenated palm oil (HIDROFAT) is a solid fat, inert in the rumen, made up of FAs of palm oil that undergo a process of hydrogenation, during which their degree of saturation increases.…”

Section: Introductionmentioning

confidence: 99%

Animal performance and meat characteristics in steers reared in intensive conditions fed with different vegetable oils

Castro

Cabezas

Fuente

et al. 2016

Animal

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Enhancing the quality of beef meat is an important goal in terms of improving both the nutritional value for the consumer and the commercial value for producers. The aim of this work was to study the effects of different vegetable oil supplements on growth performance, carcass quality and meat quality in beef steers reared under intensive conditions. A total of 240 Blonde D' Aquitaine steers (average BW = 293.7 ± 38.88 kg) were grouped into 24 batches (10 steers/batch) and were randomly assigned to one of the three dietary treatments (eight batches per treatment), each supplemented with either 4% hydrogenated palm oil (PALM) or fatty acids (FAs) from olive oil (OLI) or soybean oil (SOY). No differences in growth performance or carcass quality were observed. For the meat quality analysis, a steer was randomly selected from each batch and the 6th rib on the left half of the carcass was dissected. PALM meat had the highest percentage of 16:0 ( P < 0.05) and the lowest n-6/n-3 polyunsaturated fatty acids (PUFA) ratio ( P < 0.05), OLI had the highest content of t 11-18:1 ( P < 0.01) and c 9,t 11-18:2 ( P < 0.05) and SOY showed the lowest value of monounsaturated fatty acids (MUFA) ( P < 0.001), the highest percentage of PUFA ( P < 0.01) and a lower index of atherogenicity ( P = 0.07) than PALM. No significant differences in the sensory characteristics of the meat were noted. However, the results of the principal component analysis of meat characteristics enabled meat from those steers that consumed fatty acids from olive oil to be differentiated from that of steers that consumed soybean oil.

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Effects of dietary sources of vegetable fats on performance of dairy ewes and conjugated linoleic acid (CLA) in milk

Cited by 65 publications

References 47 publications

Enhancing unsaturated fatty acids in ewe's milk by feeding rapeseed or linseed oil

Enhancing unsaturated fatty acids in ewe's milk by feeding rapeseed or linseed oil

Feeding vegetable oils to lactating ewes modifies the fatty acid profile of suckling lambs

Animal performance and meat characteristics in steers reared in intensive conditions fed with different vegetable oils

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