TY  - JOUR
T1  - Reproductive Hormone Concentrations and Their Correlation of Different Physiological
Stages in Dulong Cows (<i>Bos frontalis</i>)
AU - Qu, Kaixing AU - He, Zhanxing AU - Huang, Meifen AU - Zhang, Jicai AU - Wang, Ankui AU - Jin, Xiandong AU - Yang, Kai AU - Zhang, Fengwei AU - Huang, Bizhi 
JO  - Journal of Animal and Veterinary Advances
VL  - 19
IS  - 12
SP  - 159
EP  - 166
PY  - 2020
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2020.159.166
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2020.159.166
KW  - Dulong cow (Bos frontalis)
KW  -hormone level
KW  -reproductive physiological stage
KW  -correlation
KW  -reproductive behavior
AB  - Plasma hormone levels were conducted
through radioimmunoassay from grazing Dulong cows.
Two surges of E<sub>2</sub> profile were found on standing estrous
(18.56&plusmn;7.87 pg mL<sup>&#150;1</sup>) and on days 240-270 of pregnancy
(11.85&plusmn;3.45 pg mL<sup>&#150;1</sup>), the lowest on days 5-10 of
post-copulation (p<0.05). P<sub>4</sub> concentration was found
the highest on days 5-10 of post-copulation
(9.35&plusmn;2.84 ng mL<sup>&#150;1</sup>) (p<0.01) and the lowest on standing
heat (0.29&plusmn;0.13 pg mL<sup>&#150;1</sup>), significantly lower than that
during gestation (p<0.05). A biphasic FSH surges were
observed during estrous forepart (2.03&plusmn;0.54 mIU mL<sup>&#150;1</sup>)
and on days 2-30 of postpartum (2.23&plusmn;0.61 mIU mL<sup>&#150;1</sup>).
Surge LH concentration reachedon days 5-10 of gestation
(10.21&plusmn;9.04 mIU mL<sup>&#150;1</sup>). Surge T level was found on days
240-270 of pregnancy, significantly higher than those in
other PPSs (p<0.01). The significant positive correlations
were found between PPSs and plasma FSH (r = 0.34,
p<0.05), P<sub>4</sub> (r = 0.31, p<0.05), T (r = 0.48, p<0.01)
concentrations, respectively, also between P<sub>4</sub> and LH
(r = 0.31, p<0.05), T and FSH (r = 0.40, p<0.01) while a
negative correlation was between plasma E<sub>2</sub> and P<sub>4</sub>
(r = -0.29, p<0.05). In conclusion, Dulong cows were
found with two surges of hormone E<sub>2</sub> and FSH and a
single surge of hormone P<sub>4</sub> and T. There were increasing
at levels of FSH, P<sub>4</sub> and T, the synergistic relationships
between P<sub>4</sub> and LH, T and FSH, the antagonistic
relationship between E<sub>2</sub> and P<sub>4</sub>, were firstly reported in
Dulong cows during PPSs.
ER  -