OVARIAN HORMONES THROUGHOUT THE OESTRUS CYCLE IN GOATS UNDER UPPER EGYPT CONDITIONS

The study was carried out in the Experimental Farm, Faculty of Agriculture,
started at 1st of December 1985 until 1st Assiut University. The study of December 1986 on 9 does (5 Egyptian Baladi and 4 Anglo-Nubian crossb red goats) for determination of estradiol 178 (E, Quant) and Progesterono hormones. Goats fed the available green fodder throughout the year by
grazing plus pelleted concentrates 1 kg/head/day. Two hundred seventy blood samples had been taken during 7 oestrus cycles in January (winter), April : May (spring), July (summer) and October (autumn).
The obtained results summarized as follows:
Progesterone hormone concentration in blood serum showed significant difference between the two studied breeds and between individuals within each breed (P/ 0.05). The oestrus cycle overall mean was 2.4+0.2 ng/ml blood serum of Egyptian Baladi v.s. 1.4+0.2 ng/ml blood serum of crossbred. The lowest level of the concentration occured on the day (0) of oestrus cycle in both breeds, it was 0.7+0.02 and 0.5+0.04 ng/ml blood serum, respectively. The maximum concentration was recorded on days 14 and 10 after oestrus in Egyptian Baladi and crossbred with averages of 5.4+0.8 and 3.1+1.5 ng/ml blood serum, respectively. There were significant differences (P/ 0.01) between the two studied breeds and between individuals within each breed in the estradiol 17B level during oestrus cycles. The overall mean of the estradiol 17B was 35.88+3.3 pg/ml blood serum in Egyptian Baladi v.s. 22.0+1.6 pg/ml blood serum for crossbred. On the other hand, there was no effect of season on estradiol 17B concentration. The maximum level of hormone was recor ded on the day (0) of oestrus; Being 65.0+9.2 and 47.7+6.4 pg/ml blood serum for Egyptian Baladi and crossbred, respectively.