The progesterone level in dogs plays a significant role in determining the optimal breeding time for female dogs and predicting the date of parturition. Here is a detailed explanation of progesterone values in dogs during reproduction:
by len king on Jun 17, 2024
Normal Progesterone Range:
Typically, when a female dog is at her optimal breeding time, the progesterone level is usually between 10-30 ng/ml, and it may exceed 60 ng/ml. This indicates that the female dog is in estrus and has a high breeding success rate.
During different stages of the estrus cycle, progesterone levels vary. For instance, on the second and third days after the LH (luteinizing hormone) peak (LH+2 and LH+3), the average progesterone concentrations are 4.8±0.9 ng/ml and 7.2±1.3 ng/ml, respectively.
Progesterone Levels and Breeding Success:
When the progesterone level is within the normal range, the breeding success rate of female dogs is usually high. For example, when the progesterone level is 46 ng/ml, the breeding success rate may be greater than 80%.
The rate of change in progesterone concentration may also affect the litter size. When using frozen semen, the rate of change in progesterone has a significant impact on the number of puppies born.
Importance of Progesterone Testing:
Progesterone testing can help assess the estrus cycle of dogs, determine the optimal breeding time, and thereby improve breeding success rates.
By tracking changes in progesterone levels, it is possible to predict the date of parturition and prepare for delivery for breeds prone to difficult labor.
Progesterone testing can also be used to determine whether "progesterone support" is needed during pregnancy, i.e., whether external progesterone supplementation is required, as well as to assist in detecting reproductive system diseases.
Factors Influencing Progesterone Levels:
Abnormal ovarian function, thyroid function, adrenal function, and nutritional deficiencies can all affect the progesterone levels of female dogs.
In conclusion, understanding progesterone levels in dogs is crucial for improving breeding success rates and predicting parturition dates. During the breeding process, it is essential to closely monitor changes in progesterone levels in female dogs and conduct necessary testing and adjustments accordingly.
