Abstract
Abstract Ovaries were recovered at slaughter from 30 cows in either a twinning (T; n = 16) or control (C; n = 14) herd. Weights of ovaries and corpora lutea (CL) and records of follicle numbers and their diameters were obtained. Mean CL numbers/cow were 1.38 ± 0.12 and 1.07 ± 0.07 in the T and C cows respectively (P < 0.10). The objective was to compare the herds for ovary weights, CL weights, and follicle data, taking account of ovary side (left or right), luteal stage (Days 4–8, 9–13, 14–18, where oestrus = Day 0), and numbers of CLs on each ovary (0 or ≥1). Ovary weights were not affected by herd, and averaged 15.0 g when a CL was present compared with 9.1 g without a CL (P < 0.001). Single CL weights averaged 5.6 and 3.2 g in ovaries from cows which had produced single or double CLs respectively (P < 0.05). Total CL weight/cow was not significantly different in T and C herds. Numbers of ovarian follicles of given size were similar in the two herds. The diameters of the largest follicle on the right ov...
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