The Concentrations Seasonal Changes Of PRL, T₃ Hormone In Hexi Cashmere Goat Serum And The Correlation Analysis With The Cashmere Growth

This study random selected 10 male and 10 female Hexi white cashmere goats that 6 months old,average body weight 15.12㎏±0.61㎏,tracked continuously the experimental goat 12 months after the escapes of the villus in May and gather the blood and cashmere each month。Determined the cashmere length of every month with the hand row of length law。Determined the density change rules of cashmere goats blood serum(PRL) and the thyroxin (T3) with Radioimmunoassay。The findings indicated as follows:1,The cashmere growth of Hexi cashmere goat presents the seasonal change rule。The cashmere started to sprout in June,July。The growth period was in August,September,October,November,December, the crest-time was in August,September,October。In January the cashmere basic stopped growth。The cashmere intensity of growth droped month by month until terminated,in may the cashmere started to escape。The cashmere's growth mainly in the autumn,winter and growed quickly in August,account for the whole year total growth 28.0%。The growth of August to November account for the whole year total growth 91.0%。2,The average densify of male,female Hexi cashmere goat's PRL is 817.38 IU/mL±269.51IU/mL,778.08 IU/mL±187.21 IU/Ml; The average density of T3 is 5.52 ng/ml±1.83ng/ml,5.42 ng/ml±2.09ng/ml. In the inidentical month the male and female goats PRL and T3 content's difference was not remarkable (P>0.05)。It showed that the experimental male and female goats's PRL and T3 content changes synchronous-parallel in the same month。3,The density of Hexi cashmere goat blood serum PRL presents obvirously the seasonal changes。The blood serum PRL's density raised from may,and achieved the high point value 1259.50 IU/mL±410.61 IU/mL . In September it droped significantly, in November it began to a small pick-up and in December it reached the second peak of 780.67±127.77 IU / mL, and then droped to February's 613.08±55.18 IU / mL。That prolactin concentration reached a peak value at the beginning of the growth of cashmere;Concentration of prolactin secretion started to decline when cashmere speeding up the growth;When once again it increased, the cashmere stopped the growth. Inhibition PRL secretion would be delayed cashmere's start growthing and start shedding time。It indicated that the concentration of prolactin increase or decrease was the important factors that the cashmere start or stop the growth。4,The T3 density of Hexi cashmere goat blood serum presents seasonal changes。The blood serum T3 density raised from February and in September it achieved the high point value 7.52 ng/ml±1.24 ng/ml,then droped gradually, achieved the minimum value 3.77 ng/ml±0.85ng/ml in February, then raised again, completed a secretion cycle。In August,September,October,November,December the average T3 density and the cashmere growth speed present was connected(r=0.955,P=0.011)。Indicated that the thyroxine was one of the important hormones that participates the goat cashmere germination and growth。...