CONTENTS OF STEROID HORMONES IN BLOOD OF CATS DEPENDING ON THE AGE AND BREED
Yu. Shcherbakova
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Odessa State Agrarian University,
3 Panteleimonovska str., Odessa 65012, Ukraine
The article compares the quantitative content of steroid hormones — estradiol, progesterone and cortisol during the follicular and luteal phases of the estrus cycle, depending on the age and breed of cats.
At the age of 4–6 months the level of sex steroids did not significantly differ between the purebred andoutbred cats. At the age of 7–12 months puberty comes and the estradiol concentration during the follicular phase is higher in 3,59–3,81 times than in the animals of 4–6 months of age. Also, the content of estradiol in purebred cats at the 7–12-month-old during the follicular phase was 5.77 % higher than theoutbred. The estradiol levels was increased by 4,72–5,05 times after puberty. The concentration of estradiol was higher in 4,72–5,05 times than baseline at the age of 13 to 60 months. The concentration of progesterone in the blood serum of outbred cats 4–6 months of age during the luteal phase of the estrus cycle was in 1.72 times higher than in purebred cats. The level of progesterone in the luteal phase of the estrus cycle in cats aged 7–12 months was 18,1–20,0 times greater than in cats 4–6 months of age. The concentration of progesterone in serum of cats over 7 months, in the luteal phase of the estrus cycle was not substantially different between different species of cats. The maximum concentration was observed in the age of 13–60 months. In outbred cats aged 5–9 years, the concentration of estradiol in the follicular phase of the estrus cycle was less than 1.12 times than in cats aged 7–12 months. In outbred cats age 61–108 months during the follicular phase estradiol concentration is 1.2 times higher than a thoroughbred. In purebred cats in this age group also showed a decrease of estradiol concentration of 1.23 times. Puberty occurs cats against the raised cortisol levels. At the same time, changes in its concentration during the estrus cycle were found.
Key words:ESTRADIOL, PROGESTERONE, CORTISOL, BLOOD SERUM, FOLLICULAR PHASE, LUTEAL PHASE, ESTRUS CYCLE,PUBERTY, PUREBRED CATS, OUTBRED CATS
