Relationship between the timing of the first postpartum ovulation and antral follicle counts in Holstein cows.
Animals
Anti-Mullerian Hormone
/ blood
Body Weight
/ physiology
Cattle
Cell Count
Estrous Cycle
/ physiology
Female
Hormones
/ metabolism
Milk
/ metabolism
Ovarian Follicle
/ cytology
Ovarian Reserve
/ physiology
Ovulation
/ physiology
Postpartum Period
/ physiology
Pregnancy
Pregnancy Rate
Time Factors
Antral follicle count
First postpartum ovulation
Ovarian reserve
Ultrasonography
Journal
Journal of ovarian research
ISSN: 1757-2215
Titre abrégé: J Ovarian Res
Pays: England
ID NLM: 101474849
Informations de publication
Date de publication:
11 Jan 2020
11 Jan 2020
Historique:
received:
19
08
2019
accepted:
06
01
2020
entrez:
14
1
2020
pubmed:
14
1
2020
medline:
21
10
2020
Statut:
epublish
Résumé
The timing of the first postpartum ovulation is an important factor affecting the timing of estrous resumption in dairy cows. The first postpartum ovulation is delayed in cows producing large amounts of milk with an intensive negative energy balance. The antral follicle count (AFC) and serum anti-Müllerian hormone concentrations are known to be indicators of the ovarian reserve, which is the number and quality of follicles left in a pair of ovaries and known as an indicator of female fertility. Cows with higher AFC have been proven to show higher pregnancy rate and shorter calving to conception intervals; however, the relationship between the timing of the first postpartum ovulation and ovarian reserve remains unclear. Therefore, this study examined the relationships between postpartum follicular dynamics, the ovarian cycle, nutritional status, and ovarian reserve. Transrectal ultrasonography was conducted from calving to 70-120 days in milk (DIM) in 26 cows to monitor AFC, follicular dynamics and the ovarian cycle. Body weight (BW) and milk yield were used as indicators of nutritional status. The first postpartum ovulation was significantly later in cows with low AFC (< 25) than in those with high AFC (≥25), while changes in BW from calving to the nadir and milk production were similar in both groups. The present results also suggested that cows with low AFC and a delayed first postpartum ovulation had a shorter first ovarian cycle after the first postpartum ovulation. The mean DIM of the first postpartum artificial insemination (AI) and days open (days from calving to AI with which pregnancy was achieved) were similar in high and low AFC groups. The first postpartum ovulation was significantly earlier in cows with high AFC than in those with low AFC. The assumed reason for this result was higher sensitivity to luteinizing hormone and larger androstenedione and estradiol production in follicles in high AFC cows. Therefore, cows with high AFC may be more fertile than those with low AFC while their milk production increase and BW decrease; it means they are in negative energy balance. (340/350 words).
Sections du résumé
BACKGROUND
BACKGROUND
The timing of the first postpartum ovulation is an important factor affecting the timing of estrous resumption in dairy cows. The first postpartum ovulation is delayed in cows producing large amounts of milk with an intensive negative energy balance. The antral follicle count (AFC) and serum anti-Müllerian hormone concentrations are known to be indicators of the ovarian reserve, which is the number and quality of follicles left in a pair of ovaries and known as an indicator of female fertility. Cows with higher AFC have been proven to show higher pregnancy rate and shorter calving to conception intervals; however, the relationship between the timing of the first postpartum ovulation and ovarian reserve remains unclear. Therefore, this study examined the relationships between postpartum follicular dynamics, the ovarian cycle, nutritional status, and ovarian reserve.
METHODS
METHODS
Transrectal ultrasonography was conducted from calving to 70-120 days in milk (DIM) in 26 cows to monitor AFC, follicular dynamics and the ovarian cycle. Body weight (BW) and milk yield were used as indicators of nutritional status.
RESULTS
RESULTS
The first postpartum ovulation was significantly later in cows with low AFC (< 25) than in those with high AFC (≥25), while changes in BW from calving to the nadir and milk production were similar in both groups. The present results also suggested that cows with low AFC and a delayed first postpartum ovulation had a shorter first ovarian cycle after the first postpartum ovulation. The mean DIM of the first postpartum artificial insemination (AI) and days open (days from calving to AI with which pregnancy was achieved) were similar in high and low AFC groups.
CONCLUSIONS
CONCLUSIONS
The first postpartum ovulation was significantly earlier in cows with high AFC than in those with low AFC. The assumed reason for this result was higher sensitivity to luteinizing hormone and larger androstenedione and estradiol production in follicles in high AFC cows. Therefore, cows with high AFC may be more fertile than those with low AFC while their milk production increase and BW decrease; it means they are in negative energy balance. (340/350 words).
Identifiants
pubmed: 31926556
doi: 10.1186/s13048-020-0610-5
pii: 10.1186/s13048-020-0610-5
pmc: PMC6954630
doi:
Substances chimiques
Hormones
0
Anti-Mullerian Hormone
80497-65-0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
7Subventions
Organisme : Japan Society for the Promotion of Science
ID : JP16K08043
Organisme : Japan Society for the Promotion of Science
ID : JP19H03117
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