Time of Ovulation Relative to Mounting Activity in Dairy Cattle

Time of ovulation was determined for Holstein cows (n = 51) for estruses occurring spontaneously (n = 33) or those induced by PGF2α (n = 86). Ultrasound examination of ovaries was conducted 42 to 49 d postpartum, followed by administration of 25mg of PGF2α if a corpus luteum was observed. In the abs...

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Published inJournal of dairy science Vol. 79; no. 9; pp. 1555 - 1561
Main Authors Walker, W.L., Nebel, R.L., McGilliard, M.L.
Format Journal Article
LanguageEnglish
Published Savoy, IL Elsevier Inc 01.09.1996
Am Dairy Sci Assoc
American Dairy Science Association
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Abstract Time of ovulation was determined for Holstein cows (n = 51) for estruses occurring spontaneously (n = 33) or those induced by PGF2α (n = 86). Ultrasound examination of ovaries was conducted 42 to 49 d postpartum, followed by administration of 25mg of PGF2α if a corpus luteum was observed. In the absence of a corpus luteum, ovaries were reexamined weekly, and PGF2α was administered upon observation of the presence of a corpus luteum. Onset of estrus was determined by HeatWatch®, an electronic pressure-sensing system that recorded each mount associated with estrus. To determine ovulation in relation to first detected mount, ultrasound examinations were conducted at 12, 20, and 24h after the initial mount and then every 2h until 40h. Cows were assigned randomly to receive one of two treatments: 1) the cow received 25mg of PGF2α 8 to 13 d later or 2) the cow was allowed to cycle spontaneously and then was switched to alternate treatment at a third cycle. The mean estrus period, determined from mounting activity recorded by Heatwatch®, consisted of 10.1 mounts over 9.5h (6.0 mounts were ≥2s) for a total 24.1s of mounting activity. Estrus characteristics were extremely variable and were not different for estruses induced by PGF2α or for those occurring spontaneously. Mean ovulation time relative to first mount was 27.6±5.4h and was not different between spontaneous and induced estruses. Knowing the time of ovulation in reference to the first mount of estrus and being able to identify the first mount consistently and accurately with the HeatWatch® system allows for accurate timing of AI.
AbstractList Time of ovulation was determined for Holstein cows (n = 51) for estruses occurring spontaneously (n = 33) or those induced by PGF2 alpha (n = 86). Ultrasound examination of ovaries was conducted 42 to 49 d postpartum, followed by administration of 25 mg of PGF2 alpha if a corpus luteum was observed. In the absence of a corpus luteum, ovaries were reexamined weekly, and PGF2 alpha was administered upon observation of the presence of a corpus luteum. Onset of estrus was determined by HeatWatch, an electronic pressure-sensing system that recorded each mount associated with estrus. To determine ovulation in relation to first detected mount, ultrasound examinations were conducted at 12, 20, and 24 h after the initial mount and then every 2 h until 40 h. Cows were assigned randomly to receive one of two treatments: 1) the cow received 25 mg of PGF2 alpha 8 to 13 d later or 2) the cow was allowed to cycle spontaneously and then was switched to alternate treatment at a third cycle. The mean estrus period, determined from mounting activity recorded by HeatWatch, consisted of 10.1 mounts over 9.5 h (6.0 mounts were > or = 2 s) for a total 24.1 s of mounting activity. Estrus characteristics were extremely variable and were not different for estruses induced by PGF2 alpha or for those occurring spontaneously. Mean ovulation time relative to first mount was 27.6 +/- 5.4 h and was not different between spontaneous and induced estruses. Knowing the time of ovulation in reference to the first mount of estrus and being able to identify the first mount consistently and accurately with the HeatWatch system allows for accurate timing of AI.
Time of ovulation was determined for Holstein cows (n = 51) for estruses occurring spontaneously (n = 33) or those induced by PGF2 alpha (n = 86). Ultrasound examination of ovaries was conducted 42 to 49 d postpartum, followed by administration of 25 mg of PGF2alpha if a corpus luteum was observed. In the absence of a corpus luteum, ovaries were reexamined weekly, and PGF2alpha was administered upon observation of the presence of a corpus luteum. Onset of estrus was determined by HeatWatch, an electronic pressure-sensing system that recorded each mount associated with estrus. To determine ovulation in relation to first detected mount, ultrasound examinations were conducted at 12, 20, and 24 h after the initial mount and then every 2 h until 40 h. Cows were assigned randomly to receive one of two treatments: 1) the cow received 25 mg of PGF2alpha 8 to 13 d later or 2) the cow was allowed to cycle spontaneously and then was switched to alternate treatment at a third cycle. The mean estrus period, determined from mounting activity recorded by HeatWatch, consisted of 10.1 mounts over 9.5 h (6.0 mounts were greater than or equal to 2 s) for a total 24.1 s of mounting activity. Estrus characteristics were extremely variable and were not different for estruses induced by PGF2alpha or for those occurring spontaneously. Mean ovulation time relative to first mount was 27.6 +/- 5.4 h and was not different between spontaneous and induced estruses. Knowing the time of ovulation in reference to the first mount of estrus and being able to identify the first mount consistently and accurately with the HeatWatch system allows for accurate timing of AI
Time of ovulation was determined for Holstein cows (n = 51) for estruses occurring spontaneously (n = 33) or those induced by PGF2 alpha (n = 86). Ultrasound examination of ovaries was conducted 42 to 49 d postpartum, followed by administration of 25 mg of PGF2 alpha if a corpus luteum was observed. In the absence of a corpus luteum, ovaries were reexamined weekly, and PGF2 alpha was administered upon observation of the presence of a corpus luteum. Onset of estrus was determined by HeatWatch, an electronic pressure-sensing system that recorded each mount associated with estrus. To determine ovulation in relation to first detected mount, ultrasound examinations were conducted at 12, 20, and 24 h after the initial mount and then every 2 h until 40 h. Cows were assigned randomly to receive one of two treatments: 1) the cow received 25 mg of PGF2 alpha 8 to 13 d later or 2) the cow was allowed to cycle spontaneously and then was switched to alternate treatment at a third cycle. The mean estrus period, determined from mounting activity recorded by HeatWatch, consisted of 10.1 mounts over 9.5 h (6.0 mounts were > or = 2 s) for a total 24.1 s of mounting activity. Estrus characteristics were extremely variable and were not different for estruses induced by PGF2 alpha or for those occurring spontaneously. Mean ovulation time relative to first mount was 27.6 +/- 5.4 h and was not different between spontaneous and induced estruses. Knowing the time of ovulation in reference to the first mount of estrus and being able to identify the first mount consistently and accurately with the HeatWatch system allows for accurate timing of AI.
Time of ovulation was determined for Holstein cows (n = 51) for estruses occurring spontaneously (n = 33) or those induced by PGF2α (n = 86). Ultrasound examination of ovaries was conducted 42 to 49 d postpartum, followed by administration of 25mg of PGF2α if a corpus luteum was observed. In the absence of a corpus luteum, ovaries were reexamined weekly, and PGF2α was administered upon observation of the presence of a corpus luteum. Onset of estrus was determined by HeatWatch®, an electronic pressure-sensing system that recorded each mount associated with estrus. To determine ovulation in relation to first detected mount, ultrasound examinations were conducted at 12, 20, and 24h after the initial mount and then every 2h until 40h. Cows were assigned randomly to receive one of two treatments: 1) the cow received 25mg of PGF2α 8 to 13 d later or 2) the cow was allowed to cycle spontaneously and then was switched to alternate treatment at a third cycle. The mean estrus period, determined from mounting activity recorded by Heatwatch®, consisted of 10.1 mounts over 9.5h (6.0 mounts were ≥2s) for a total 24.1s of mounting activity. Estrus characteristics were extremely variable and were not different for estruses induced by PGF2α or for those occurring spontaneously. Mean ovulation time relative to first mount was 27.6±5.4h and was not different between spontaneous and induced estruses. Knowing the time of ovulation in reference to the first mount of estrus and being able to identify the first mount consistently and accurately with the HeatWatch® system allows for accurate timing of AI.
Author Nebel, R.L.
Walker, W.L.
McGilliard, M.L.
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IsDoiOpenAccess true
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Issue 9
Keywords radiotelemetry
CL
artificial insemination
estrous behavior
STP
ovulation
HW
Farming animal
Estrus
Dairy cattle
Ox
Cow
Synchronization
Ovulation
Vertebrata
Mammalia
Investigation method
Artificial insemination
Artiodactyla
Ungulata
Language English
License http://www.elsevier.com/open-access/userlicense/1.0
CC BY 4.0
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PMID 8899521
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  year: 1996
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PublicationTitle Journal of dairy science
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PublicationYear 1996
Publisher Elsevier Inc
Am Dairy Sci Assoc
American Dairy Science Association
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Snippet Time of ovulation was determined for Holstein cows (n = 51) for estruses occurring spontaneously (n = 33) or those induced by PGF2α (n = 86). Ultrasound...
Time of ovulation was determined for Holstein cows (n = 51) for estruses occurring spontaneously (n = 33) or those induced by PGF2 alpha (n = 86). Ultrasound...
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StartPage 1555
SubjectTerms Animal productions
Animals
artificial insemination
Biological and medical sciences
Cattle - physiology
CHOIX DE LA DATE
CICLO ESTRAL
COMPORTAMIENTO SEXUAL
COMPORTEMENT SEXUEL
Corpus Luteum - drug effects
Corpus Luteum - physiology
CYCLE OESTRAL
Dinoprost - pharmacology
DURACION
DUREE
ELECCION DE LA EPOCA
estrous behavior
Estrus - drug effects
Estrus - physiology
Estrus Detection
Female
Fundamental and applied biological sciences. Psychology
INSEMINACION ARTIFICIAL
INSEMINATION ARTIFICIELLE
Lactation
Ovary - diagnostic imaging
OVULACION
OVULATION
Progesterone - blood
RACE (ANIMAL)
radiotelemetry
RAZAS (ANIMALES)
Sexual Behavior, Animal - physiology
SINCRONIZACION DEL CELO
SYNCHRONISATION DE L'OESTRUS
TELEMETRIA
TELEMETRIE
TEMPERATURA AMBIENTAL
TEMPERATURE AMBIANTE
Terrestrial animal productions
Time Factors
Ultrasonography
VACAS LECHERAS
VACHE LAITIERE
Vertebrates
Title Time of Ovulation Relative to Mounting Activity in Dairy Cattle
URI https://dx.doi.org/10.3168/jds.S0022-0302(96)76517-7
http://jds.fass.org/cgi/content/abstract/79/9/1555
https://www.ncbi.nlm.nih.gov/pubmed/8899521
https://www.proquest.com/docview/1877076340
https://search.proquest.com/docview/78505885
Volume 79
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