Study of progesterone and cortisol concentrations in the Italian Friesian claw.
作者： A. Comin , T. Peric , L. Magrin , M. Corazzin , G. Cornacchia
关键词: Hormone 、 Claw 、 Pregnancy 、 Hoof 、 Breed 、 Coefficient of variation 、 Significant difference 、 Milking 、 Endocrinology 、 Biology 、 Internal medicine
摘要: Abstract The present research was conducted to study progesterone and cortisol concentrations in the claw of cattle verify whether could be considered an efficient matrix provide retrospective information regarding related pregnancy peripartum periods. These 2 steroids are involved hoof growth. performed on 32 calves 24 pregnant milking cows Holstein breed, which were clinically healthy lacking any disorders. Samples at least 0.5cm thickness taken from sole. Progesterone determined by RIA. concentration horny shoe 0 30 d age significantly higher than 31 60 61 120 age. Conversely, showed no statistically significant difference relation horn recorded dairy 7 mo high variability horizontal sections sole (the individual coefficient variation ranged between 0.09 1.11). In 6 cows, genuine extreme values (genuine outliers) level found. Moreover, differences existed among sole's transverse sections. We detected a positive correlation weight samples after freeze-drying their hydration. levels soaked found lower same dry samples. results show that can measured horn. claws mature not used as measure cumulative hormone secretion, whereas analysis calves' horns hormonal similar hair
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