Follicular dynamics, corpus luteum growth and regression in lactating dairy cattle

Follicular dynamics, corpus luteum growth and regression in multiparous buffalo cows and buffalo heifers

Objective. Characterize the follicular dynamics and luteal growth and regression pattern of multiparous (MB) and heifer (BH) Murrah buffaloes in Colombian tropical conditions. Material and methods. Ten MB and ten BH were synchronized with a progesterone-releasing intravaginal device. No artificial insemination was performed during the estrous and daily ultrasound examinations were performed 15 ...

Status of autophagy, lysosome activity and apoptosis during corpus luteum regression in cattle

Corpus luteum (CL) regression is required during the estrous cycle. During CL regression, luteal cells stop producing progesterone and are degraded by apoptosis. However, the detailed mechanism of CL regression in cattle has not been fully elucidated. The aim of this study was to evaluate autophagy, lysosome activity, and apoptosis during CL regression in cattle. The expression of autophagy-rel...

Corpus Luteum function and parturition in cattle and pigs

At term pregnancy in cattle and pigs progesterone is from luteal origin. Like in other domestic animal species, parturition in the cow and pig is preceeded by a sudden drop in the matemal plasma progesterone concentration. An increased Output of Prostaglandin from the pregnant uterus is most likely responsible for prepartum luteolysis. The withdrawal of progesterone is not immediately followed ...

Carbohydrate nutrition for lactating dairy cattle

Follicle growth, corpus luteum function and their effects on embryo development in postpartum dairy cows.

Absent or irregular ovarian cycles in lactating dairy cows are caused by failure to ovulate the dominant follicle at the appropriate time. The follicle then either regresses or develops into a cyst. This process can be triggered by a variety of metabolic and disease factors that act at the hypothalamus and pituitary gland to inhibit pulsatile LH secretion and the LH surge, and at the ovary to r...