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Prepuberal evolution of plasma leptin levels in gilts ofthrifty genotypeIberian pig and lean commercial crosses Large White × Landrace


, : Prepuberal evolution of plasma leptin levels in gilts ofthrifty genotypeIberian pig and lean commercial crosses Large White × Landrace.

Current study aimed to determine possible differences in plasma leptin levels during the prepuberal period and their relationship with the onset of puberty in gilts of obesethrifty genotype(Iberian breed) and lean genotype (Large White Landrace commercial crosses) reared under similar conditions. Plasma leptin concentration increased linearly during the 7 weeks prior to the day of puberty attainment in both genotypes (P < .5,r = .77 for LW L andP < .5,r = .874 for Iberian gilts). However, leptin levels in the Iberian gilts was higher from the first sample of the experimental period, with females having 16 weeks-old (2.7 .3 vs 1.7 .2 ng/ml in LW L;P < .1), to the onset of puberty (8.5 .7 vs 2.8 .3 ng/ml in LW L;P < .5). Thus, the current study reinforces previous data on changes in around puberty and evidences, for the first time, profound differences in prepuberal plasma leptin levels between gilts of obese (Iberian) and lean genotypes (LW L).

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