Document Type : Original Article
Authors
1
Department of Theriogenology, Faculty of Veterinary Medicine, Assiut University, Assiut, Egypt.
2
Department of Theriogenology, Faculty of Veterinary Medicine, New Valley University.
Abstract
To study the biometrical data of the ovaries from slaughtered Balady does in relation to estrous cycle and seasons, a total number of 127 normal pair ovaries were taken for this purpose in Assiut province. The obtained materials were classified according to phases of estrus cycle (Proestrous 39, Estrus 12, Metestrus 23 and Diestrus 53) and as well according to seasons (Autumn 36, Winter 40, Spring 26 and Summer 25). The biometry of the ovaries included the length, breadth, thickness and weight. The surface follicles and corpora lutea were counted in each ovary and their diameters measured. The follicles were classified according to their size into: small (< 3 mm), medium (3-5 mm) and large (> 5 mm). The ovaries of does were small, almond shape and shiny. The right ovaries are significantly larger than the left (P<0.01). Among phases of estrous cycle, the heaviest ovarian weights (left and right) were recorded during diestrus, followed by metestrus, estrus then proestrus. The ovarian length, breadth and thickness showed the same pattern of variations with significant differences (P< 0.01). The largest average values recorded for ovarian length, breadth, thickness and weight were found in autumn followed by winter, spring and summer. Differences were significant in most of these criteria (P<0.01). The highest values recorded for the right ovarian weight noticed during autumn, in the diestrus phase of the cycle, (1.56±0.22g) while the lowest value was present in left ovary during summer in proestrus (0.79±0.52g). The right ovaries carried the heaviest C.L. and the larger numbers of follicles among all samples. The total number of all follicles (small, medium and large) is significantly higher (P< 0.01) in right than left ovaries (110.97±11.18 versus 106.38±13.09). The autumn has the largest values for the total numbers of follicles followed by winter, spring and summer. The maximum number of C. L. per doe reached 6, in single case, while in rare occasion a single ovary carried 4 C. L. In the majority of cases the ovary carried 1-2 C. L. The ratios between single C.L. weight and intact ovarian weight were 26.9, 24.6, 23.8 and 23.4 percentages during autumn, winter, spring and summer respectively.
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