Revisiting the Timing of Insemination at Spontaneous Estrus in Dairy Cattle

López‐Gatius, F.

doi:10.3390/ani12243565

Cited by 12 publications

(4 citation statements)

References 78 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Significant variations in the duration of estrus and the time interval between its onset, end, and the time of ovulation have been associated with the conception rate with sexed and CS in dairy cows [ 19 ]. A thorough exploration of the literature showed that the duration of estrus ranged from 7 to 16 h, and the onset and end of estrus to ovulation time ranged from 27 to 30 h and 12 to 19 h, respectively [ 20 ].…”

Section: Discussionmentioning

confidence: 99%

Comparative study of reproductive and estrus characteristics of sexed and conventional semen in crossbred cows under field conditions

Sharma,

Sood,

Kumar

et al. 2024

Vet World

View full text Add to dashboard Cite

Background and Aim: Sexed semen (SS), a reproductive biotechnology tool, can alter the sex ratio of offspring in bovines. This study elucidates a comparative analysis of estrus-related parameters influencing conception rate and pregnancy losses under field conditions between conventional and SS. Materials and Methods: In the present study, artificial insemination with (SS; n = 143) and conventional semen (CS; n = 143) was performed at spontaneous estrus, i.e., 16–18 h after the onset of estrus signs, to analyze their comparative evaluation in terms of conception rates in crossbred cows under field conditions. Different parameters such as age, parity, body condition score (BCS), estrus duration, inter-estrus interval (IEI), diameter of pre-ovulatory follicle (DPOF) at estrus, and cervical mucus properties (pH and spinnbarkeit [SBK]) were recorded for each cow. Results: The first insemination conception rates for sexed and conventional semen were 55.24% and 63.63% whereas the overall conception rates were 49.14% and 57.37% on days 35 and 75 post-insemination, respectively, with no significant difference (p > 0.05). Conception rates between sexed and CS inseminations were statistically significant (p < 0.01), whereas factors such as age, parity, BCS, DPOF, IEI), and SBK value exhibited no substantial variance (p > 0.05) for both types of semen straw. Conclusion: SS straws yielded a conception rate equivalent to CS straws, with estrus duration being the key factor affecting conception under field conditions. Keywords: conception rate, crossbred cows, estrus duration, pregnancy losses, sexed semen.

show abstract

Section: Discussionmentioning

confidence: 99%

Comparative study of reproductive and estrus characteristics of sexed and conventional semen in crossbred cows under field conditions

Sharma,

Sood,

Kumar

et al. 2024

Vet World

View full text Add to dashboard Cite

show abstract

“…The time interval between the onset/ or end of oestrus to the time of ovulation and the duration of oestrus varies widely in dairy cattle (López‐Gatius, 2022). In a study, it has been shown that the onset/and the end of oestrus to ovulation time and the duration of oestrus ranged from 27–30 h, 12–19 h and 7–16 h respectively (Dransfield et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

Evaluation of sexed semen‐based artificial insemination in Tharparkar cattle under organized farm condition

Patra,

Sasidharan,

Rajput

et al. 2023

Reprod Domestic Animals

View full text Add to dashboard Cite

Sexed semen facilitates additional female calf production for the expansion of a herd at a faster rate and also curtails the surplus production of unwanted male calves. A study was conducted to evaluate the performance of sexed semen in indigenous Tharparkar cows based on 114 artificial inseminations (AI) performed at natural oestrus using two protocols i.e., single AI (n = 48) and double AI (n = 66). Overall, the first service conception rate (CR) was significantly higher in double (53.0%) than single (33.3%) AI protocol. The odds ratio of conception rate in double AI was 2.26 (χ2 = 4.4, df = 1, p = .04) with respect to single AI. The time that elapsed since the detection of oestrus to insemination was also analysed. In a single AI protocol, the CR was higher (p < .05) at 16 h (54.6%) than insemination at 8 h (27.0%) following the onset of oestrus. Yet, the CR using double AI protocol did not differ (p = .73) significantly when AIs were performed either at 8 h and 24 h (51.9%) or 16 h and 24 h (57.1%) post onset of oestrus. Besides, like the single AI protocol, the parity of the animals also influenced the CR, being higher in heifers (n = 22) than those of parous (n = 92) cows (72.73 vs. 40.43%, χ2 = 7.48, df = 1, p = .006) in the present study. The odds ratio of conception in heifers was 3.93 with respect to parous cows. Overall, the birth of female calf was 91.7%. In conclusion, the present study indicates a future promise of the sexed semen for the production of more female offspring from Tharparkar cattle.

show abstract

“…Однако недавние результаты показывают, что этот интервал следует сократить до 16-6 часов до овуляции, приближая ее к концу течки. [15].…”

Section: классическая схемаunclassified

Эффективность Схем Синхронизации Эстрального Цикла У Коров Молочных Пород И Оптимальное Время Искусственного Осеменения

Ussenbekov,

Тургумбеков А. А,

Омарбекова У. Ж

et al. 2023

GBJ

View full text Add to dashboard Cite

Авторами работы проведено изучение эффективности различных схем синхронизации эстрального цикла у коров голштинской породы в условиях племенного хозяйства ТОО «Байсерке-Агро» Талгарского района Алматинской области. По результатам исследования установлена более высокая результативность применения схемы синхронизации ОвСинх по сравнению с протоколом ПреСинх-ОвСинх, процент стельности составил соответственно, 61% и 57%. Для оценки уровня плодотворного осеменения коров авторами впервые был использован критерий – индекс невозврата коров после искусственного осеменения на 58-й день, показатели которого были выше у коров, обработанных схемой ОвСинх (62%) по сравнению с протоколом ПреСинх-ОвСинх (46%). Монитрониг репродуктивной функции коров голштинской породы показывает, что большой процент коров, 39% и 46%, были плодотворно осеменены только в результате двух или трехкраного осеменения после отела, наблюдается по сравнению с голштинской породой высокая фертильность у коров джерсейской породы, где большая доля коров (40%) плодотворно осеменялись в результате первичного осеменения. Следует отметить, что процент стельности телок в результате первичного осеменения был выше (74% и 76%) у телок обеих пород. Рекомендуется для увеличения результативности синхронизации схемой ОвСинх проводить перед гормональной обработкой коров УЗИ сканирование яичников и определение размеров домининантных фолликулов, наиболее положительно реагируют на гормональную обработку коровы, имеющие в яичниках доминантные фолликулы с диаметром 4-5- мм (75%) и 7-8 мм (67%). Таким образом, использование программы AfiTag II для выявления физической активности позволяет опеределить оптимальное время искусственного осеменения коров.

show abstract

Revisiting the Timing of Insemination at Spontaneous Estrus in Dairy Cattle

Cited by 12 publications

References 78 publications

Comparative study of reproductive and estrus characteristics of sexed and conventional semen in crossbred cows under field conditions

Comparative study of reproductive and estrus characteristics of sexed and conventional semen in crossbred cows under field conditions

Evaluation of sexed semen‐based artificial insemination in Tharparkar cattle under organized farm condition

Эффективность Схем Синхронизации Эстрального Цикла У Коров Молочных Пород И Оптимальное Время Искусственного Осеменения

Contact Info

Product

Resources

About