Aberrations of estrus and the oestrous cycle refer to deviations from the normal reproductive cycle in female animals, often caused by hormonal imbalances, genetic factors, nutritional deficiencies, or environmental stressors.
Several factors influence the oestrous cycle in animals, affecting its duration, frequency, and regularity.
The endocrine control of the oestrous cycle is a complex interplay of hormones regulated by the hypothalamic-pituitary-gonadal axis.
The normal estrous cycle length in sheep is 17 days and in goat is 21 days. Photoperiodism is a characteristic of the reproductive cycle or sexual receptivity in sheep and goats.
The sow is a polyestrous species, meaning she exhibits multiple estrous cycles throughout the year without being restricted to specific breeding seasons.
The normal estrous cycle in the mare (female horse) is 21-22 days. Equine heat period displays behavioural signs of sexual receptivity to the stallion, lasts for 5 to 7 days
Oestrus cycle in animals is the rhythmic sexual behavioural pattern developed in females after puberty. The combination of physiological events which begin with one oestrous period and ends with the next is called oestrous cycle.
Pregnancy failure refers to the inability of a pregnancy to establish or progress to full term, resulting in the loss of the embryo or fetus at any stage.
Failure of conception is recognized by an increased number of regular returns to service (i.e., returns at 18–24 days after service).
The process of fertilization involves ovum maturation, sperm maturation, and interaction of sperm and ovum.
