Timing the insemination of beef cattle

Robbins, R.K.; Sullivan, John J.; Pace, M. M.; Elliott, F.I.; Bartlett, David E.; Press, P.J.; Co, Woody

doi:10.1016/0093-691x(78)90024-9

Cited by 14 publications

(3 citation statements)

References 3 publications

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“…There is no tradition for using synchronization and fixed-time AI in Norwegian cattle herds, and because there is an increase in consumer resistance toward hormonal treatment for fertility in cows, this is an unlikely strategy also in the future [ 14 , 15 ]. Therefore, it is important to increase the knowledge regarding the optimal timing of AI in beef cows experiencing naturally occurring oestrus as few modern studies address this issue [ 16 ]. The optimal insemination time for beef heifers that have undergone oestrus synchronization treatments has been estimated to be 8–12 h after onset of oestrus [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Time of insemination in relation to pregnancy rates in beef cattle after oestrus detection with automated activity monitoring system

et al. 2023

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Background The timing of artificial insemination is critical to achieve acceptable results in cattle production systems. Over the past 60 years the length and expression of oestrus in dairy cattle has altered. Recent studies have indicated the optimal timing for insemination after the commencement of oestrus may now be earlier than traditional recommendations in beef cattle, as is the case in dairy cattle. The aim of the current study was to evaluate the effect of time from onset of oestrus [as determined by an automated activity monitoring system (AAMS)] to artificial insemination (AI) on pregnancy outcome in Norwegian beef cattle. Five commercial beef suckler herds participated in a cohort study by providing data on the time of AAMS alarm and time of AI. Blood sampling on the day of AI was performed and serum progesterone concentration measured. Pregnancy detection was performed by transrectal ultrasonography and aging of the fetus performed when necessary. A mixed logistic regression model was fitted to study the effect of time from AAMS alarm to AI on pregnancy outcome. Time categories used in the model were < 12 h, 12–24 h, and > 24 h. Results AI periods (n = 229) with serum progesterone concentration < 1 ng/mL were available for analysis. Overall pregnancy risk per AI for the whole study period was 65.5%, with an inter-herd variation from 10 to 91%. Median time elapsed from AAMS alarm to AI was 17.75 h. Herd affected pregnancy outcome (P = 0.001), while breed and parity status (heifer/cow) did not. The time category closer to AAMS alarm 0–12 h showed a numerically lower pregnancy risk as compared to the baseline group which had AI 12–24 h after onset of oestrus. Conclusion This study found no evidence to support a change in the recommended timing of AI in beef suckler cows.

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Section: Introductionmentioning

confidence: 99%

Time of insemination in relation to pregnancy rates in beef cattle after oestrus detection with automated activity monitoring system

et al. 2023

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“…Eine unzureichende Brunsterkennung stellt in intensiv geführten Milchviehbetrieben eine der Hauptursachen für eine nicht zufriedenstellende Herdenfruchtbarkeit dar (68). Nach Schätzungen verschiedener Autoren werden tatsächlich weniger als 50% der brünstigen Kühe erkannt (4,25,82).…”

Section: Introductionunclassified

Strategische hormonelle Fruchtbarkeitsprogramme bei Kühen

Schmidt¹,

Gajewski²,

Wehrend³

2013

Tierarztl Prax Ausg G

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Zusammenfassung Gegenstand und Ziel: Beschreibung der verschiedenen hormonellen Fruchtbarkeitsprogramme bei Kühen. Material und Methode: Literaturübersicht. Ergebnisse: Es werden die physiologischen Grundlagen und die Durchführung von Hormonprogrammen auf Basis von Prostaglandinen und des kombinierten Einsatzes von Prostaglandinen und GnRH-Analoga dargestellt. Dabei erfolgt eine Beschreibung von Vor- und Nachteilen der verschiedenen Programme. Ausgehend vom Ovsynch-Programm werden dessen Modifikationen Cosynch, Select Synch, Heatsynch und Ultrasynch dargestellt. Klinische Relevanz: Die Darlegung der verschiedenen Fruchtbarkeitsprogramme soll dem Tierarzt helfen, das optimale Vorgehen für die von ihm betreuten Betriebe zu gestalten.

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“…35 Using ARTs as a benchmark for animal health is questionable given that there are recognized problems with ARTs. 35% of artificial inseminations, 36 for example, and 50% of in vitro fertilizations 37 have been reported to result in miscarriage.…”

Section: The Fda's Assessment Of Animal Health Risks: Comparisons To mentioning

confidence: 99%

On Animals

Persian Wisdom in Arabic Garb

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Cloning is the term commonly used to refer to a procedure known as somatic cell nuclear transfer (SCNT), the procedure which was first used to create Dolly the sheep in 1996. 1 Since then, researchers have cloned a number of different animals, including cows, pigs, goats, horses, mice, cats, and dogs. 2 The process is far from perfected, however, with only 1-4% of cloning attempts, if any, generally succeeding. 3 Despite such an abysmal record, the biotech industry is moving to commercialize animal cloning by asking the FDA to allow milk and meat from cloned animals to be sold to the public. The FDA intends to release a draft risk assessment announcing the safety of consuming food products from cloned animals by the end of 2006 or early in 2007. 4 If the draft is upheld by the end of the comment period that follows, cloned food products will be allowed on the market, and the FDA will likely not require that these products be labeled. Food safety, however, is only one of the many issues that need to be examined before such a decision can be made. With 96-99% of cloning attempts regularly causing death or severe health problems, for example, there is widespread recognition in the scientific and medical communities that cloning presents serious risks to the animals involved. 5,6,7,8 But questions about the impact of cloning on animal welfare have yet to be adequately addressed, much less resolved.

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Timing the insemination of beef cattle

Cited by 14 publications

References 3 publications

Time of insemination in relation to pregnancy rates in beef cattle after oestrus detection with automated activity monitoring system

Time of insemination in relation to pregnancy rates in beef cattle after oestrus detection with automated activity monitoring system

Strategische hormonelle Fruchtbarkeitsprogramme bei Kühen

On Animals

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