{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,7,30]],"date-time":"2025-07-30T16:36:02Z","timestamp":1753893362490,"version":"3.41.2"},"reference-count":39,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2022,3,15]],"date-time":"2022-03-15T00:00:00Z","timestamp":1647302400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Vet. Sci."],"abstract":"<jats:p>Further optimization of reproduction management programs in dairy cows is a contemporary research topic. In this context, our study aimed to compare a hormone program, named \u201cuterus-ovary monitoring and classified use of hormone program\u201d (M+C), with the Pre-OvSynch program. The M+C was based on regular application of B-mode ultrasonography during a voluntary waiting period to monitor the uterus and ovaries, while using various treatments under different conditions. Results of the 30\u201333-day and 60-day pregnancy\/artificial insemination after the first AI of M+C were significantly better than the Pre-OvSynch (<jats:italic>p<\/jats:italic> &amp;lt; 0.05). The pregnancy rates within 180 days in milk after M+C was significantly higher than that after Pre-OvSynch (<jats:italic>p<\/jats:italic> &amp;lt; 0.05). The total number of inseminations used for M+C was significantly lower than that for Pre-OvSynch (<jats:italic>p<\/jats:italic> &amp;lt; 0.01). The number of open days was fewer after M+C than after the Pre\u2013OvSynch throughout the experimental period with highly significant differences (<jats:italic>p<\/jats:italic> &amp;lt; 0.01). In summary, the use of M+C enhances reproductive benefits and reduces the need for hormone drugs among cows.<\/jats:p>","DOI":"10.3389\/fvets.2022.840724","type":"journal-article","created":{"date-parts":[[2022,3,15]],"date-time":"2022-03-15T05:44:18Z","timestamp":1647323058000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["Comparison of the Evaluation of Combination of Ultrasonography of the Reproductive Tract With Hormone Administration on Dairy Cow 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