Format

Send to

Choose Destination
Animals (Basel). 2018 Apr 24;8(5). pii: E62. doi: 10.3390/ani8050062.

Update on Multiple Ovulations in Dairy Cattle.

Author information

1
Livestock Research Section, Alberta Agriculture and Forestry, Edmonton, AB T6H 5T6, Canada. kira.macmillan@gov.ab.ca.
2
Department of Production Animal Health, University of Calgary, Calgary, AB T2N 4Z6, Canada. jpkastel@ucalgary.ca.
3
Livestock Research Section, Alberta Agriculture and Forestry, Edmonton, AB T6H 5T6, Canada. marcos.colazo@gov.ab.ca.

Abstract

This review updates the causal mechanisms and risk factors for multiple ovulations (MOV) in cattle. Clearly, MOV can lead to twin pregnancies, which negatively affects the health, production, and reproduction of cows. Therefore, a better understanding of the factors causing MOV may help to reduce twinning. Multiple ovulations occur after two or more follicles deviate and achieve codominance. The MOV rate is influenced by a complex network of hormones. For example, MOV is more common during periods of low progesterone (P4), that is, in anovulatory cattle or when luteolysis coincides with the selection of the future ovulatory follicle. There is also strong evidence for the luteinizing hormone (LH) being the primary factor leading to codominance, as high P4 concentrations suppress the transient LH surges and can reduce the ovulation rate in cattle or even inhibit deviation. Rates of MOV are increased in older and higher-producing dairy cows. Increased milk production and dry matter intake (DMI) increases hormone clearance, including P4; however, the association between milk yield and MOV has not been consistent. Additional risk factors for MOV include ovarian cysts, diet, season, and genetics.

KEYWORDS:

codominance; cow; double ovulations; follicle deviation; ovary; twinning rate

Supplemental Content

Full text links

Icon for Multidisciplinary Digital Publishing Institute (MDPI) Icon for PubMed Central
Loading ...
Support Center