Carcass fat partitioning and meat quality of Alentejana and Barrosã young bulls fed high or low maize silage diets

Costa, Ana S. H.; Costa, P.; Bessa, Rui J. B.; Lemos, J. P. C.; Simões, J. A.; Santos‐Silva, José; Fontes, Carlos M. G. A.; Prates, José A. M.

doi:10.1016/j.meatsci.2012.10.010

Cited by 15 publications

(17 citation statements)

References 61 publications

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“…Wood et al (2008) showed that the meat of concentrate-fed young bulls had a higher intramuscular fat content than that of animals fed on high-forage diets. Costa et al (2013) reported a breed Â diet interaction for intramuscular fat content from Alentejana and Barrosa young bulls fed with highor low-silage diets. Our findings were in accordance with those of Cooke et al (2004), who reported no difference in fat content in Charolais cross heifers reared either on a total mixed ration or high concentrate diet.…”

Section: Discussionmentioning

confidence: 99%

Influence of feeding system (concentrate and total mixed ration) on fatty acid profiles of beef from three lean cattle breeds

Horcada

Polvillo

Juárez

et al. 2016

Journal of Food Composition and Analysis

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Section: Discussionmentioning

confidence: 99%

Influence of feeding system (concentrate and total mixed ration) on fatty acid profiles of beef from three lean cattle breeds

Horcada

Polvillo

Juárez

et al. 2016

Journal of Food Composition and Analysis

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“…Results concerning productive performance were described previously [61]. Briefly, Alentejana bulls fed the high silage diet had an average weight of 622 ± 17.7 kg at slaughter, whereas the average weight for those fed the low silage diet was 636 ± 29.7 kg.…”

Section: Methodsmentioning

confidence: 99%

Expression of genes controlling fat deposition in two genetically diverse beef cattle breeds fed high or low silage diets

Costa¹,

Pires²,

Fontes³

et al. 2013

BMC Vet Res

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BackgroundBoth genetic background and finishing system can alter fat deposition, thus indicating their influence on adipogenic and lipogenic factors. However, the molecular mechanisms underlying fat deposition and fatty acid composition in beef cattle are not fully understood. This study aimed to assess the effect of breed and dietary silage level on the expression patterns of key genes controlling lipid metabolism in subcutaneous adipose tissue (SAT) and longissimus lumborum (LL) muscle of cattle. To that purpose, forty bulls from two genetically diverse Portuguese bovine breeds with distinct maturity rates, Alentejana and Barrosã, were selected and fed either low (30% maize silage/70% concentrate) or high silage (70% maize silage/30% concentrate) diets.ResultsThe results suggested that enhanced deposition of fatty acids in the SAT from Barrosã bulls, when compared to Alentejana, could be due to higher expression levels of lipogenesis (SCD and LPL) and β-oxidation (CRAT) related genes. Our results also indicated that SREBF1 expression in the SAT is increased by feeding the low silage diet. Together, these results point out to a higher lipid turnover in the SAT of Barrosã bulls when compared to Alentejana. In turn, lipid deposition in the LL muscle is related to the expression of adipogenic (PPARG and FABP4) and lipogenic (ACACA and SCD) genes. The positive correlation between ACACA expression levels and total lipids, as well trans fatty acids, points to ACACA as a major player in intramuscular deposition in ruminants. Moreover, results reinforce the role of FABP4 in intramuscular fat development and the SAT as the major site for lipid metabolism in ruminants.ConclusionsOverall, the results showed that SAT and LL muscle fatty acid composition are mostly dependent on the genetic background. In addition, dietary silage level impacted on muscle lipid metabolism to a greater extent than on that of SAT, as evaluated by gene expression levels of adipogenic and lipogenic factors. Moreover, the response to diet composition evaluated through mRNA levels and fatty acid composition showed interesting differences between Alentejana and Barrosã bulls. These findings provide evidence that the genetic background should be taken into account while devising diet-based strategies to manipulate fatty acid composition of beef cattle tissues.

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“…Starch-based diets are known to increase carcass fat at similar metabolizable energy intake (Brennan et al, 1987), but the effect may also depend on the rate of gain (Coleman et al, 1995). Few experiments have studied the impact of energy source in finishing cattle at controlled intakes (Brennan et al, 1987;Bartoň et al, 2007;Costa et al, 2013). The effect of the source and amount of energy has most often been studied in growing cattle, often during winter growing programs, showing little carryover effects on body composition and fat depots over fattening (e.g., Sharman et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…At similar metabolizable energy intake, Mueller et al (2011) did not find any differences in daily gain between fiber and starch diets. Still, isoenergetic and isonitrogenous high-starch vs. fiber-rich rations that also resulted in similar daily gains and muscle depot induced fatter carcasses with starchy diets in young bulls after 8 mo of fattening (Costa et al, 2013). Increased lipogenesis with starch diets was associated with greater ruminal propionic fermentations and possibly greater starch bypass and greater insulinemia (Majdoub et al, 2003).…”

Section: Growth Slaughter Characteristics and Efficiencymentioning

confidence: 98%

Fattening performance, metabolic indicators, and muscle composition of bulls fed fiber-rich versus starch-plus-lipid-rich concentrate diets1

Mialon

Renand²,

Ortigues-Marty

et al. 2015

Journal of Animal Science

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The aim of this study was to compare the responses in fattening performance and meat composition for high-concentrate diets rich in either starch and lipids (especially omega-3 fatty acids) or fibrous by-products. A total of 140 Charolais bulls (initially 319 ± 27 kg BW) were allocated to 3 high-concentrate diets and were fattened for up to 18 mo. The diet treatments included concentrate mixtures rich in either fiber (FR; n = 56) or starch plus linseed (diets SL and SLR; n = 56 and n = 28, respectively) and barley straw. The concentrate mix was offered ad libitum in SL and FR diets but was kept isoenergetic to the FR diet in the SLR diet. Bulls were weighed every 15 d. Feed intake was measured daily. Carcass composition was assessed for all animals slaughtered at 699 ± 65 kg BW. Meat nutritional quality traits (e.g., fat content and fatty acid composition focusing on n-6 and n-3 polyunsaturated fatty acids) were measured on the longissimus thoracis, rectus abdominis, and semitendinosus muscles. Metabolic enzyme activity (phosphofructokinase, lactate dehydrogenase, and cytochrome-c oxidase) was measured on these muscles and on liver. The SL diet bulls had greater fattening performance, BW gain (P = 0.006), and efficiency for growth (P = 0.025) at an energy intake similar to that of FR diet bulls. They also had heavier carcasses with a greater proportion of fat. However, liver samples showed no difference in specific metabolic activity. Compared to bulls fed the SL diet, bulls fed SLR consumed 15% less energy and had lower BW gain (P < 0.001) but were slightly more efficient for growth (P = 0.010). They had lower carcass weight but a greater muscle-to-fat ratio. Compared to bulls fed the FR diet, SLR bulls had lower than planned NEg intake and lower BW gain but did not have differences in body composition. Compared to the FR diet, the SL diet led to a greater omega-3 fatty acid content because of a greater supply of dietary linoleic acid, especially in lean muscle.

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Carcass fat partitioning and meat quality of Alentejana and Barrosã young bulls fed high or low maize silage diets

Cited by 15 publications

References 61 publications

Influence of feeding system (concentrate and total mixed ration) on fatty acid profiles of beef from three lean cattle breeds

Influence of feeding system (concentrate and total mixed ration) on fatty acid profiles of beef from three lean cattle breeds

Expression of genes controlling fat deposition in two genetically diverse beef cattle breeds fed high or low silage diets

Fattening performance, metabolic indicators, and muscle composition of bulls fed fiber-rich versus starch-plus-lipid-rich concentrate diets1

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