Simple Test for Determining Ovulation Time

Investigation of Cervical Mucus as an Indicator of Ovarian Activity in Pigs

“…Nishikawa & Harada (1954) detected crystals in smears of sows' vaginal mucus. Birnberg, Kurzrok & Laufer (1958) (Keston, 1956) for the detection of glucose. Their later studies were made with 'Ovutest',* the same enzyme system in a slightly more sensitive form.…”

Cyclic Changes in the Metabolism of Glycogen in Cervical Mucus of Bonnet Monkeys (Macaca Radiata)

“…The presence of carbohydrates in the cervical mucus has been reported by several authors (Breckenridge & Pommerenke, 1951;Birnberg, Kurzrok & Laafer, 1958). Recent studies by Kirton & Hafs (1965) Amylase has been demonstrated in human cervical mucus and Fallopian tube tissue (Breckenridge & Pommerenke, 1951;Green, 1957 Demers & Greep (1973) have reported a correlation between peripheral serum progesterone and endometrial glycogen levels.…”

Changes in Pig Cervical Mucus in Relation to the Oestrous Cycle

“…Ullery, Livingston & Abou-Shabanah, 1959;Simmons, 1965). Extensions of these studies demonstrated that reducing substances increase in the cervical mucus of women at ovulation (Birnberg, Kurzrok & Laufer, 1958), a peak in the Na content of dry cervical mucus occurs at ovulation (Herzberg, Joel & Katchalsky, 1964) and an increase in chloride content is also coincident with ovulation (McSweeny & Sbarra, 1967). In farm animals, arborization peaks, corresponding to those in the human, occur around oestrus in cows (Alliston, Patterson & Ulberg, 1958), sheep (Raeside & McDonald, 1959) and sows (Betteridge & Raeside, 1962), but variability in relation to the time of ovulation is greater than in the human.…”