Abstract

Progesterone administered before breeding may increase estrous expression and subsequent fertility in lactating dairy cows. Holstein cows (n=302) were assigned randomly at calving to three groups. Cows received no treatment (controls), one injection of prostaglandin F 2-α (PGF), or progesterone plus one injection of PGF (PRID + PGF). The average interval to estrus was 5 days shorter in PRID + PGF cows compared to cows given only PGF. In addition, more cows were observed in estrus 2 to 5 days after treatment in the PRID + PGF group compared to the PGF group. Average days from calving to conception were reduced in PRID + PGF cows by 15 to 20 days compared to control and PGF cows. We concluded that prebeeding progesterone in combination with PGF appears to enhance fertility.; Dairy Day, 1987, Kansas State University, Manhattan, KS, 1987;

Keywords: Kansas Agricultural Experiment Station contribution, no. 88-114-S, Report of progress (Kansas Agricultural Experiment Station), 527, Dairy, Progesterone, Prostaglandin F2-α, Fertility, Lactation

How to Cite:

Mee, M., Stewart, R., Stevenson, J. S. & Call, E. P., (1987) “Influence of prebreeding progesterone plus prostaglandin F2-α on estrus and fertility in lactating dairy cows”, Kansas Agricultural Experiment Station Research Reports 1(2), 32-34. doi: https://doi.org/10.4148/2378-5977.3029