Plasma leptin in growing lambs as a potential predictor for carcass composition and daily gain

Altmann, M.; Sauerwein, H.; Borell, Eberhard von

doi:10.1016/j.meatsci.2006.05.013

Cited by 14 publications

(21 citation statements)

References 24 publications

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“…However, there was a tendency between leptin levels of 20 and 40 kg BWs. Similar results were reported by Altmann et al (2006) who reported that serum leptin did not change significantly in lambs (East Frisian and Blackheaded Mutton Â East Frisian crosses) of 20 and 30 kg BW but the authors found that it increased at 35 kg and until 40 kg. In the present study, leptin levels did not reach to 3 ng/ml even in 40 kg lambs.…”

Section: Resultssupporting

confidence: 88%

“…A similar positive and significant correlation coefficient (r ¼ 0.64, p < .05) was found between serum leptin level and omental fat in Awassi male lambs and a similar correlation coefficient (r ¼ 0.60, p < .05) was reported by Altmann et al (2006) for 40 kg BW East Frisian and Blackheaded Mutton x East Frisian crosses lambs. A similar correlation coefficient (r ¼ 0.66, p < .05) was reported by Swelum et al (2017) between leptin level and internal fat in male lambs.…”

Section: Relationship Between Leptin and Fat Tissues Amountsupporting

confidence: 78%

“…On the other hand, serum leptin levels were at least 3 ng/ml for all BWs lambs in previous study (Altmann et al 2006). Additionally, in the present study, leptin level increase was approximately 30% (no data info) until 40 kg but Altmann et al (2006) reported that leptin increase was more than 30% between 30-35 kg BW, also Radwanska and Kosior-Korzecka (2016) Orman et al (2008Orman et al ( , 2010 UFT was increased with the increase of live weight of Awassi lambs. Also, a similar result was reported by Altmann et al (2005) for different breeds (East Frisian and Blackheaded Mutton Â East Frisian crosses).…”

Section: Resultscontrasting

confidence: 52%

“…Ultrasound fat thickness (UFT) measurements were similar to the accuracy for the estimation of carcase fat by serum leptin concentrations at slaughter time in lambs (Altmann et al 2005). On the other hand, the relationship between serum leptin concentrations in early life and carcase characteristics are poorly found out in lambs (Altmann et al 2005(Altmann et al , 2006.…”

Section: Introductionmentioning

confidence: 90%

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The usefulness of leptin measurements and ultrasound fat thickness for assessment of body fat reserves of Awassi lambs

Orman

Caliskan

Temizel

et al. 2018

Italian Journal of Animal Science

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The objective of this study was to investigate the usefulness of leptin measurements for predicting back fat thickness and the amount of carcase fat in lambs with varying body weights (BWs). Blood samples were taken from 20 male Awassi lambs at 20, 25, 30, 35, and 40 kg BW. Tail, omental, dissected, and total fat were measured at slaughter (40 kg BW). Ultrasound fat thickness (UFT) increased with BW (p < .05) whereas leptin concentration tended to increase (p ¼ .09). Serum leptin concentration was correlated with BW for 25, 30, 35, and 40 kg BW (r ¼ 0.53, 0.52, 0.51 and 0.61, respectively; p < .05) and with UFT for 30, 35, and 40 kg BW (r ¼ 0.50, 0.51 and 0.59, respectively; p < .05); therefore it appears that leptin concentration is not a suitable predictor for BW and UFT in low BW lambs. In addition, similar correlations were found for leptin concentration and hot carcase, omental, dissected, and total fat weights (r ¼ 0.62, 0.64, 0.66 and 0.76, respectively; p < .05) but not for tail fat (p >.05 for 40 kg BW). The introduction of UFT and BW as independent variables in addition to leptin in the multiple regression equations improved the predictions for carcase fat only (57.6%, p < .05; 57.8%, p < .05 and 60.7%, p > .05 for leptin, leptin þ UFT and leptin þ BW, respectively). Leptin was a single predictor for omentum and dissected fat (41.4%, p < .05 and 43.5%, p < .05 respectively) whereas no improvement was observed for tail fat (p > .05). The other variables (UFT and BW) were not a predictor (p > .05) except for total fat (p > .05). These results indicate that serum leptin concentration in association with BW and UFT could be used to estimate total fat (tail, omental and dissectible carcase fat) in male Awassi lambs. ARTICLE HISTORY

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Section: Resultssupporting

confidence: 88%

Section: Relationship Between Leptin and Fat Tissues Amountsupporting

confidence: 78%

Section: Resultscontrasting

confidence: 52%

Section: Introductionmentioning

confidence: 90%

See 2 more Smart Citations

The usefulness of leptin measurements and ultrasound fat thickness for assessment of body fat reserves of Awassi lambs

Orman

Caliskan

Temizel

et al. 2018

Italian Journal of Animal Science

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“…For instance, double-muscled bovines with low IMF level are characterized also by lower triiodothyronine, insulin and glucose plasma concentrations (Hocquette et al, 1999) than normal animals of the same breed. Serum leptin has been correlated with fat deposition traits in ruminants (Geary et al, 2003), but not with IMF level (Altmann et al, 2006). When different bovine breeds that differ in their ability to deposit fat are compared, no clear relationships between muscle growth potential and fat deposition are observed (Albertí et al, 2008).…”

Section: How Might Marbling Begin?mentioning

confidence: 99%

Intramuscular fat content in meat-producing animals: development, genetic and nutritional control, and identification of putative markers

Hocquette

Gondret

Baéza³

et al. 2010

Animal

656

447

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Intramuscular fat (IMF) content plays a key role in various quality traits of meat. IMF content varies between species, between breeds and between muscle types in the same breed. Other factors are involved in the variation of IMF content in animals, including gender, age and feeding. Variability in IMF content is mainly linked to the number and size of intramuscular adipocytes. The accretion rate of IMF depends on the muscle growth rate. For instance, animals having a high muscularity with a high glycolytic activity display a reduced development of IMF. This suggests that muscle cells and adipocytes interplay during growth. In addition, early events that influence adipogenesis inside the muscle (i.e proliferation and differentiation of adipose cells, the connective structure embedding adipocytes) might be involved in interindividual differences in IMF content. Increasing muscularity will also dilute the final fat content of muscle. At the metabolic level, IMF content results from the balance between uptake, synthesis and degradation of triacylglycerols, which involve many metabolic pathways in both adipocytes and myofibres. Various experiments revealed an association between IMF level and the muscle content in adipocyte-type fatty acid-binding protein, the activities of oxidative enzymes, or the delta-6-desaturase level; however, other studies failed to confirm such relationships. This might be due to the importance of fatty acid fluxes that is likely to be responsible for variability in IMF content during the postnatal period rather than the control of one single pathway. This is evident in the muscle of most fish species in which triacylglycerol synthesis is almost zero. Genetic approaches for increasing IMF have been focused on live animal ultrasound to derive estimated breeding values. More recently, efforts have concentrated on discovering DNA markers that change the distribution of fat in the body (i.e. towards IMF at the expense of the carcass fatness). Thanks to the exhaustive nature of genomics (transcriptomics and proteomics), our knowledge on fat accumulation in muscles is now being underpinned. Metabolic specificities of intramuscular adipocytes have also been demonstrated, as compared to other depots. Nutritional manipulation of IMF independently from body fat depots has proved to be more difficult to achieve than genetic strategies to have lipid deposition dependent of adipose tissue location. In addition, the biological mechanisms that explain the variability of IMF content differ between genetic and nutritional factors. The nutritional regulation of IMF also differs between ruminants, monogastrics and fish due to their digestive and nutritional particularities.

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Associations of feed efficiency with circulating IGF-1 and leptin, carcass traits and meat quality of lambs

et al. 2021

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Plasma leptin in growing lambs as a potential predictor for carcass composition and daily gain

Cited by 14 publications

References 24 publications

The usefulness of leptin measurements and ultrasound fat thickness for assessment of body fat reserves of Awassi lambs

The usefulness of leptin measurements and ultrasound fat thickness for assessment of body fat reserves of Awassi lambs

Intramuscular fat content in meat-producing animals: development, genetic and nutritional control, and identification of putative markers

Associations of feed efficiency with circulating IGF-1 and leptin, carcass traits and meat quality of lambs

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