Effect of dietary starch level and its rumen degradability on lamb meat fatty acid composition

Oliveira, Maria Alexandra; Alves, Susana P.; Santos‐Silva, José; Bessa, Rui J.B.

doi:10.1016/j.meatsci.2016.10.001

Cited by 28 publications

(26 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…One of the consequences of the t-10 shift in ruminants is the low concentration of c-9,t-11-18:2 in tissues (Bravo-Lamas et al, 2016;Oliveira et al, 2016Oliveira et al, , 2017. Consistently, we observed a relatively low concentration of c-9,t-11-18:2 in LM and s.c. fat under all treatments.…”

Section: Discussionsupporting

confidence: 88%

The reduction of starch in finishing diets supplemented with oil does not prevent the accumulation of trans-10 18:1 in lamb meat1

Costa

Alves

Francisco

et al. 2017

Journal of Animal Science

View full text Add to dashboard Cite

The experiment was conducted to test the hypothesis that the replacement of cereal with low-starch feed ingredients in lambs' finishing diets supplemented with oils could prevent the accumulation of -10-18:1 in meat. Forty lambs were fed 1 of 4 diets supplemented with soybean oil (5.9%) and fish oil (1%) for 6 wk before slaughter. The control (CON) diet contained 43% barley, and in the other diets, barley was completely replaced by dehydrated citrus pulp (DCP), dehydrated sugar beet pulp (DBP), or soybean hulls (SH). Growth performance, feed intake, and carcass and meat quality traits were analyzed. At slaughter, LM samples were collected for gene expression evaluation, and 3 d after slaughter, LM and subcutaneous (s.c.) fat samples were collected for fatty acid analysis. None of the diets affected meat quality, but the DCP diet reduced ADG ( < 0.05) and the DCP and SH diets decreased the feed-to-gain ratio ( < 0.01). The DCP diet increased ( < 0.05) the risk of parakeratosis and the severity of the lesions. Moreover, the DBP treatment led to increased a* (redness) and b* (yellowness) in s.c. fat compared with the CON treatment ( < 0.05). The lipid content of LM did not differ ( > 0.05) with treatment and averaged 34.4 g/kg of meat. Diets had no effect ( > 0.05) on SFA, PUFA, and -MUFA sums and on the -6:-3 ratio in both LM and s.c. fat. A lower expression of fatty acid synthase (FASN) was found with the DCP treatment than with the other treatments ( < 0.001). All treatments showed a high accumulation of -10-18:1, averaging 91 mg/g fatty acid in LM and 147 mg/g fatty acid in s.c. fat. The concentration of -11-18:1 in the tissues was considerably lower than that of -10-18:1, and thus the -10-18:1:-11-18:1 ratio was above 3 with all treatments. Despite this, the SH diet clearly promoted a larger deposition of -11-18:1 and -9,-11-18:2 in tissues compared with the other treatments. () gene expression and SCD activity index in LM were reduced with the SH diet compared with the CON and DCP diets. Overall, these results clearly showed, for the first time, that low-starch/high-NDF diets are not able to prevent the establishment of -10 shifted rumen biohydrogenation pathways, evaluated by the deposition of biohydrogenation intermediates in lamb meat and fat.

show abstract

Section: Discussionsupporting

confidence: 88%

The reduction of starch in finishing diets supplemented with oil does not prevent the accumulation of trans-10 18:1 in lamb meat1

Costa

Alves

Francisco

et al. 2017

Journal of Animal Science

View full text Add to dashboard Cite

show abstract

“…Decreasing the n-6/n-3 ratio in the diet has been considered favorable for human health, although some limitations when considering this ratio have also been risen more recently [39]. However, it should be taken into account that the column used to analyze the meat FA profile was not appropriate to identify biohydrogenation intermediates, as longer columns are necessary to analyze these intermediates [40], and therefore the results on meat FA profile are limited to the FA detected.…”

Section: Resultsmentioning

confidence: 99%

Effect of a Diet Supplemented with Malic Acid–Heat (MAH) Treated Sunflower on Carcass Characteristics, Meat Composition and Fatty Acids Profile in Growing Lambs

Haro

Evan

Vázquez

et al. 2020

Animals

View full text Add to dashboard Cite

Simple Summary: One of the main objectives of animal nutrition is to optimize the production of the animals in order to obtain good-quality products, but decreasing the environmental pollution caused by livestock production has also become a priority in the last years. Compared to other farm animals, ruminants have low N utilization efficiency that is mainly due to the inefficient use of nitrogen (N) in the rumen and a large portion of the ingested N is excreted causing environmental problems such as water and soil eutrophication. In this study we analyzed the influence of feeding sunflower seeds (SS) and meal (SM) subjected to a combined malic acid-heat treatment (MAH) on carcass characteristics and meat composition and fatty acid profile of growing lambs. The MAH treatment was applied to reduce ruminal degradation of SS and SM protein and therefore N losses. Compared to control-fed lambs, animals fed the treated SS and SM had increased dorsal fat thickness and yellowness and chromaticity of the Rectus abdominis muscle, which might be beneficial for consumers' acceptance as they associate a bright meat color with meat freshness and quality. However, there were no differences between groups in meat chemical composition and fatty acid profile. Abstract:The objective of the study was to assess the effects of feeding sunflower meal (SM) and seeds (SS) protected against rumen degradation on carcass characteristics and composition and fatty acid (FA) profile of lamb meat. The protection of SM and SS was achieved by treating both feeds with malic acid at 150 • C for 2 h (MAH treatment) and in a previous study this treatment was shown to decrease ruminal degradability of protein of both feeds and fat degradability of SS. Two homogeneous groups of 12 lambs each were fed ad libitum high-cereal concentrates and cereal straw from 14 to 26 kg of body weight. The two concentrates differed only in the treatment SM and SS, which were included either untreated (control) or MAH treated. The MAH-fed lambs had greater thickness of dorsal fat (p = 0.016) and greater (p ≤ 0.016) values of the color parameters a* (redness) and C* (chromaticity) of the Rectus abdominis muscle. However, there were no differences in carcass measurements and in water-holding capacity, chemical composition, pH, color, or fatty acid of Longissimus muscle. In summary, the MAH treatment resulted in only subtle changes in meat composition and quality.

show abstract

“…On the other hand, if observed, differences between the FIB and CON treatments should be attributed not only to the presence of camelina by-products and other unusual ingredients in the FIB concentrate, but also to its high NDF to starch ratio, the unsaturation degree of its fat, and its greater consumption. In this regard, replacing cereals by NDF rich feedstuffs in the diet has proven to modify ruminal fermentation parameters in lambs (Fimbres et al 2002;Bodas et al, 2007), whereas the interaction between starch intake and dietary FA has shown a significant effect on the intramuscular FA profile (Oliveira et al 2017).…”

Section: Resultsmentioning

confidence: 99%

Intramuscular fatty acid profile of feedlot lambs fed concentrates with alternative ingredients

et al. 2019

View full text Add to dashboard Cite

The effect of concentrates based on unconventional ingredients on the intramuscular fatty acid profile of lambs was evaluated. A total of 105 lambs were assigned to one of three treatments: Control (concentrate based on cereals and soybean meal like commercial concentrates), Camelina (where 50% of crude protein from soybean meal was replaced by camelina meal), and Fibrous (concentrate based on several fibrous by-products, such as soybean hulls and wheat bran, as well as camelina meal and other unconventional ingredients). After 42 days in feedlot, the lambs were sacrificed, and the fatty acid profile of intramuscular fat was determined by gas chromatography. Total meat lipids (1.25 g/100 g of meat) were not modified by the treatments. The Camelina treatment showed minor effects on the intramuscular fat composition. In contrast, the Fibrous treatment showed the highest contents of trans-11 18:1 (vaccenic acid), cis-9 trans-11 18:2 (rumenic acid) and α-linolenic acid. Thus, the non-traditional Fibrous concentrate assayed in the present study might improve the meat quality of light lambs from a nutritional point of view.

show abstract

Effect of dietary starch level and its rumen degradability on lamb meat fatty acid composition

Cited by 28 publications

References 39 publications

The reduction of starch in finishing diets supplemented with oil does not prevent the accumulation of trans-10 18:1 in lamb meat1

The reduction of starch in finishing diets supplemented with oil does not prevent the accumulation of trans-10 18:1 in lamb meat1

Effect of a Diet Supplemented with Malic Acid–Heat (MAH) Treated Sunflower on Carcass Characteristics, Meat Composition and Fatty Acids Profile in Growing Lambs

Intramuscular fatty acid profile of feedlot lambs fed concentrates with alternative ingredients

Contact Info

Product

Resources

About