Superovulation following follicular synchronization with GnRH at random stages of the oestrous cycle in heifers
نویسندگان
چکیده
منابع مشابه
The effect of prostaglandin F2 alpha during various stages of the oestrous cycle of beef heifers.
The effects of prostaglandin F2\g=a\on peripheral plasma progesterone and oestrogen levels, incidence of oestrous cycle alteration, and fertility were examined in thirty beef heifers. The PGF2\g=a\was administered by insertion of an insemination pipette into the lumen of the uterus during three periods of the oestrous cycle: Days 3 to 5, Days 9 and 10, and Days 16 and 17. Oestrus occurred withi...
متن کاملOvarian follicular populations at two stages of an estrous cycle in heifers given high energy diets.
Sixteen crossbred heifers were assigned at random on d 3 of an estrous cycle to continue to receive the medium quality hay (control diet) or to be flushed with a grain ration (high-energy diet) until slaughtered on d 12 or 16. The ovarian follicles were counted and measured using routine histological techniques. Both the nonatretic and atretic (more than four pyknotic bodies) antral follicles (...
متن کاملHormone concentrations in the caudal vena cava during the first ovarian follicular wave of the oestrous cycle in heifers.
Changes in pulsatile secretion of LH, FSH, oestradiol and progesterone were related to the growth phase, early plateau phase and regression phase of the first ovarian dominant follicle of the oestrous cycle in Bos indicus heifers. Relationships between these hormones during the three phases were also investigated. Accurate measurements of episodic ovarian steroid secretion were obtained by cath...
متن کاملFollicular dynamics throughout the oestrous cycle in sheep. A review.
Whatever the stage of the cycle, follicles of various sizes are apparent on the surface of the ovary of sheep. No evidence of waves of follicular growth at fixed-time intervals has been found during the luteal phase, and growth probably occurs at random until the follicle attains a size of 4 to 7 mm. This shows that follicles can enlarge under a wide range of hormonal levels. The recruitment of...
متن کاملGlycosidase determination in bovine oviducal fluid at the follicular and luteal phases of the oestrous cycle.
Gamete recognition and binding of spermatozoa to the oviduct are carbohydrate-mediated processes in which several glycosidases are thought to have a role, although this has not been demonstrated unequivocally. Oviducal fluid is the biological milieu in which fertilisation and early embryo development take place, but the enzyme composition of oviducal fluid is largely unknown. The aim of the pre...
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ژورنال
عنوان ژورنال: Czech Journal of Animal Science
سال: 2011
ISSN: 1212-1819,1805-9309
DOI: 10.17221/325/2009-cjas