Determinants of Estrous Behavior in Lactating Holstein Cows
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TLDR
It is indicated that the surface on which cows were observed had a profound effect on sexual behavior; however, postpartum interval, season of year, and milk yield were of minor importance.About:
This article is published in Journal of Dairy Science.The article was published on 1986-08-01 and is currently open access. It has received 164 citations till now. The article focuses on the topics: Postpartum period & Estrous cycle.read more
Citations
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Reproductive loss in high-producing dairy cattle: where will it end?
TL;DR: Critical areas for new research include control of the estrous cycle, metabolic effects of lactation on reproduction, mechanisms linking disease to reproduction, and early embryonic mortality.
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Relationship between level of milk production and estrous behavior of lactating dairy cows.
TL;DR: High milk production decreases duration of estrus probably due to decreased circulating concentrations of E(2), as determined by standing activity recorded by a radiotelemetry system.
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Timing of Insemination for Dairy Cows Identified in Estrus by a Radiotelemetric Estrus Detection System
TL;DR: The optimal time of artificial insemination (AI) was determined from data for 2661 AI in 17 herds utilizing a radiotelemetric system for estrus detection that has the potential for continuous 24-h surveillance to monitor behavioral events associated with estrus.
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Effect of Lameness on Ovarian Activity in Postpartum Holstein Cows
TL;DR: The hypothesis that lameness is associated with delayed ovarian activity in Holstein cows during the early postpartum period support the idea that delayed ovarian cyclicity in lame cows would be reduced if lameness had been prevented.
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Automation of oestrus detection in dairy cows: a review
TL;DR: Results of oestrus detection varied depending on the used threshold value, the number of cows, housing and treatment of cows and the utilised method of time series analysis, so a comparison of different time series methods and multivariate analysis of traits would be useful.
References
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Reproductive traits of Holsteins and Jerseys. Effects of age, milk yield, and clinical abnormalities on involution of cervix and uterus, ovulation, estrous cycles, detection of estrus, conception rate, and days open.
TL;DR: Clinical problems at parturition and postpartum lowered reproductive performance in both breeds and there was a slight antagonism between milk yield and reproductive performance (days open) in Jerseys but not in Holsteins.
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Estrous and related behaviour in postpartum Holstein cows
TL;DR: The frequency distribution of agonistic interactions was approximately doubled during the estrous period while the distribution of instigator/victim ratios reached the highest value one day before estrus and the lowest value on the first post estrus day.
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Transitory changes in plasma progestins, estradiol, and luteinizing hormone approaching ovulation in the bovine.
TL;DR: Radioimmunoassay results are consistent with the hypothesis that an increase at proestrus in estradiol rather than progestins triggers the preovulatory surge of luteinizing hormone in the bovine.
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Ovarian function and estrus in dairy cows during early lactation.
TL;DR: In both groups there was close agreement between basal progesterone concentrations and observed estrous activity, and there was no difference between the groups in the incidence of abnormal ovarian activity, or in the interval from parturition to first, second or third ovulation.
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Influence of Estrus Detection on Days Open in Dairy Herds
TL;DR: Data from 10 herds on a herd reproductive status program supported estimates of lost reproductive days per cow per year due to conception failure and missed heat as 23 and 10 days.