Anoestrus & suboestrus

FSHFollicle Stimulating Hormone: responsible for the growth of ovarian follicles. secretion quickly resumes after calvingGiving birth to a calf., leading to the emergence of a first follicular wave and selectionStage of the Follicular wave in which 3 or 4 previously recruited follicles move from an FSH-dependent phase to an LH-dependent phase. of a dominant follicleSmall secretory or excretory cavity. Ovarian follicles grow until ovulation or female gamete emission.. What happens to this follicleSmall secretory or excretory cavity. Ovarian follicles grow until ovulation or female gamete emission. depends on the frequency of LHLuteinising hormone: responsible for the final maturation of the follicle and ovulation. pulses.

In the absence of progesteroneSteroid hormone secreted by the corpus luteum of the ovary which has the property of making the endometrium suitable for implantation, maintenance and development of the fertilized egg. (Progesterone also results in multiple activities for the endometrium, myometrium, cervix, vagina and udder.). It inhibits GnRH secretion by feedback action on the pituitary., the frequency of LHLuteinising hormone: responsible for the final maturation of the follicle and ovulation. pulses in a cow post-partumPeriod between parturition and the return to cyclicity (and therefore appearance of heat). is regulated by its feeding, body condition and the suckling of its calf.

The first ovulationExpulsion of an ovum from the ovary in female animals. can take place between the 10th and 20th day after calvingGiving birth to a calf..

In only one in three cases this ovulationExpulsion of an ovum from the ovary in female animals. is accompanied by visible heatAlso “oestrus”. Physiological and behavioural phenomena that precedes and accompanies ovulation in female mammals.. It is only after the first one or two cycles that the interval between oestrusAlso known as heat, is the physiological and behavioral phenomena which precedes and accompanies ovulation in female mammals. becomes regular.

The resumption of FSHFollicle Stimulating Hormone: responsible for the growth of ovarian follicles. secretion and follicular development, as well as the time when the first dominant follicleSmall secretory or excretory cavity. Ovarian follicles grow until ovulation or female gamete emission. is formed are the same for dairy cows and for meat breeds.

However, what happens to the dominant follicleSmall secretory or excretory cavity. Ovarian follicles grow until ovulation or female gamete emission. is different; in only 25 to 30% of beef suckler cows does the first dominant follicleSmall secretory or excretory cavity. Ovarian follicles grow until ovulation or female gamete emission. ovulate.

In fact, the stimulus of feeding their calf, sometimes associated with poor body condition, leads to a decline in the frequency of LHLuteinising hormone: responsible for the final maturation of the follicle and ovulation. pulses. Therefore, beef cows can have between 1 and 12 dominant follicles before their first ovulationExpulsion of an ovum from the ovary in female animals..