Plasma leptin as a predictor for carcass composition in growing lambs

Abstract

Abstract:The experiment was conducted on 30 single born Polish Merino ram lambs. At the age of 112 d, 10 ram lambs were slaughtered at 20 kg (group 1), 25 kg (group 2), and 30 kg (group 3) live weight. Plasma leptin increased between 20 and 25 kg, as well as 25 and 30 kg live weight. The differences between group 1 vs. group 3 and group 2 vs. group 3 were statistically important (P < 0.001). The lack of differences in meat content of the pelvic limb between the groups and, at the same time, the lower fat content (P < 0.001) in group 1, plus the higher fat content of the two remaining groups, are evidence of the higher fatness of carcasses in groups 2 and 3. The fat tissues except the subcutaneous fat were significantly related with the leptin concentrations at slaughter. The leptin concentration of lambs slaughtered at 30 kg live weight surpassed significantly the values noted in groups 1 and 2 (P < 0.001). The correlations between leptin and body composition indicate that plasma leptin concentration at 30 kg live weight can be a predictor of body fat. The correlation of meat weight with leptin concentration has shown no statistical differences.

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

“…Also, a similar result was reported by Altmann et al (2005) for different breeds (East Frisian and Blackheaded Mutton  East Frisian crosses). On the other hand, Kuznicka et al (2017) reported that fat thickness over the eye loin did not change with live weight in merino male lambs. It stood out that back fat thickness was faster in increase than serum leptin levels by BW in Awassi male lambs.…”

“…For instance, Higashiyama et al (2003) reported serum leptin level was positively related to carcase fatness (r ¼ 0.69, p < .05) in Japanese Black steers and Altmann et al (2006) reported a lower correlation coefficient (r ¼ 0.41, p < .05) for male lambs at 40 kg BW. Also, Kuznicka et al (2017) reported an other lower correlation coefficient (r ¼ 0.41, p < .05) but it was for low weight (20, 25 and 30 kg) BWs male merino lambs. These results mean that fat accumulation for different tissues can occur at different BWs in different breed and species.…”

Effect of Leptin and Erythropoietin Concentration Levels on the Productive Traits on a Sample of Awassi Sheep

“…There was no effect of leptin concentration on fertility rate, but twins rates increased in the group of ewes with medium leptin concentration, reaching 23.05%.explains it the recent research suggests that leptin plays an important role in female reproduction, including ovarian function control [8]. Leptin is important in signaling nutritional status to the mammalian central reproductive axis and appears to be a permissive factor in the initiation of puberty at least in some cases [9]. We observe a correlation between leptin hormone concentration and progesterone and estrogen concentrations, with the concentrations of the two hormones increasing by 0.55 and 0.22, respectively, in ewes with medium leptin concentrations compared to ewes with low and high leptin concentrations.This is consistent with a study that found a direct relationship between progesterone hormone levels [10].…”

Serum Markers for Evaluating Beef Meat Quality: Potential Applications in Cell-Cultured Meat Production

“…Leptin concentrations are strongly associated with adipocyte mass. Adipocyte mass increases, and simultaneously concentrations of leptin also increase, because adipocyte size may influence leptin synthesis [59,60]. Serum concentrations of leptin were positively correlated with a marbling score, kidney, pelvic, and heart fat (KPH), fat depth, quality grade, and yield grade of meat [61].…”