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    Effects of Dietary Protein Level on Serum Growth Hormone, Insulin-Like Growth Factors and Performance in Kivircik Lambs
    (MEDWELL ONLINE, 2008) Bilal, T.; Keser, O.; Serpek, B.; Haliloglu, S.
    Due to studies on the effect of dietary protein on serum Growth Hormone (GH) and insulin-like growth factor-1 (IGF-1) concentrations in lambs fed at different levels of dietary protein are limited, this study was conducted to determine the effect of dietary protein level on GH and IGF-1 concentrations and performance in lambs. A total of 50 Kivircik male lambs were randomly selected for this experiment. Lambs were randomly assigned ten lambs to each of the five treatment diets containing 10, 12, 14, 16 and 18% CP to determine the effects of dietary CP level on performance, serum GH and IGF-1 concentrations. The initial body weight was similar for all lambs and averaged 26.20 +/- 1.10 kg. Final body weight of lambs were 37.31 +/- 1.46, 39.60 +/- 1.18, 39.85 +/- 1.24, 42.04 +/- 1.25 and 41.44 +/- 1.13 kg for groups fed 10, 12, 14, 16 and 18% CP, respectively and lambs fed 16 and 18% CP diet had significantly higher body weight than those of 10% CP (p<0.05). Mean concentrations of GH and IGF-1 in blood serum of lambs were not different significantly between groups.
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    The relationship among vitamin C, beta-carotene, vitamin A, progesterone and oestradiol 17-beta concentrations in plasma and cyst fluid of holstein cows with ovarian cyst
    (WILEY-BLACKWELL, 2008) Haliloglu, S.; Erdem, H.; Serpek, B.; Tekeli, T.; Bulut, Z.
    The aims of this study were to determine the concentrations of the progesterone, oestradiol-17-beta, vitamin A, C and beta-carotene in plasma and cyst fluid and to relate these values with cystic diameter and membrane thickness of Holstein cattle with ovarian luteal cyst. 1650 Holstein cows were examined for the presence of the ovarian cyst and luteal and follicular cystic ovaries were obtained following slaughtering in personal slaughterhouse in Konya-Turkey. 15 Luteal and 15 follicular cystic ovaries were distinguished by rectal palpation and by post mortem ultrasonographic examination. Plasma and cyst fluid, hormone and vitamin analyses were carried out by EIA method and spectrophotometric measurement respectively. Although there was no relationship between beta-carotene and vitamin A in plasma and cyst fluid of both cyst type and hormone concentrations, the vitamin C concentration of cyst fluid was found significantly higher in luteal cyst than in follicular cyst. Moreover, there is a positive correlation among values of the vitamin C concentrations of cyst fluid and cystic membrane thickness, plasma and the cyst fluid progesterone concentrations, but there is a negative correlation among the vitamin C concentrations of cystic fluid and oestradiol 17 beta levels of plasma and cyst fluid. In conclusion, vitamin C concentration of cyst fluid supported ultrasonographic and endocrinologic findings. Also, it can be postulated that vitamin C is probably effective on progesterone synthesis in the luteal tissue of cyst.