MORE PROGESTERONE… YES PLEASE!!…
LESS INFLAMMATION…YES PLEASE!!…
The study of the ovarian cycle of the cow has shown that the development of a fertile follicle is dependent on two metabolically related factors:
– the blood progesterone concentration
– the reduction of systemic inflammation present in the post-partum phase, especially in the summer period (“heat stress”)
BOVINE OVARIAN CYCLE: HORMONAL PHASES DURATION
Let’s analyze in detail how the progesterone trend affects the degree of fertility of the cow in the crucial phases of the bovine ovarian cycle marked by the numbering on the graph:
1 The high rate of blood progesterone (3.0 ng / ml vs 1.3 ng / ml) negatively affects ovulation following the execution of the Double Ovsynch protocol (81.1% vs 60%).
2 The high rate of blood progesterone increases the possibility of impregnating the cow at the next AF (51% vs 37%) in Ovsynch protocol (n = 564); cows with reduced blood progesterone, on the other hand, had double ovulation. (Cunha et al., 2008).
3 The progesterone concentration influences the final follicular wave for the maturation of the dominant follicle (Bisinotto et al 2010).
4 The concentration of blood progesterone allows the implantation and survival of the embryo at the uterine level; 60% of cows appear to have a value <7.4 ng / mL at day 5 post AF. (Stronge et al 2005)
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