124 Reutilisation of intravaginal progesterone devices during fixed-time artificial insemination with sex-sorted semen in dairy heifers

In seasonal block calving herds reproductive efficiency can have a significant impact on productivity and profitability. Within this it is key that the nulliparous heifers calve down promptly in the block, and if these heifers can have heifer calves it will expediate genetic gain. There is extensive research into the conception rates of differing protocols and the literature is reviewed to support the choice of protocol used in the subsequent case study. The case study uses a 6-day progesterone protocol with two injections of prostaglandin F2α and sexed semen; it demonstrated acceptable conception rates as well as the variability that can occur between different bulls' semen straws. Finally, the case study assesses the costs and benefits of the synchronisation programme and concludes a cost benefit of £88.55 per heifer.

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Nutzung einer terminorientierten Besamung beim Rind auf der Grundlage einer Prostaglandin – GnRH-Behandlung

Archives Animal Breeding ◽

10.5194/aab-47-27-2004 ◽

2004 ◽

Vol 47 (1) ◽

pp. 27-36

Author(s):

F. Becker ◽

E. Kanitz ◽

F. Schneider ◽

G. Nürnberg ◽

W. Kanitz

Keyword(s):

Artificial Insemination ◽

Fixed Time ◽

Pregnancy Rates ◽

Oestrous Cycle ◽

Lh Surge ◽

Dairy Heifers ◽

65 H ◽

The Mean ◽

Timed Artificial Insemination ◽

Predetermined Time

Abstract. Title of the paper: Practical application of timed artificial insemination in cattle using a GnRH and Prostaglandin treatment Three experiments were conducted to establish a regime of oestrous synchronization and artificial insemination at a predetermined time in dairy cattle. In experiment 1, dairy heifers (n = 43) were synchronized by administering PGF2α on day 5, 8, 11 or 14 and the LH surge was recorded. Release of the LH surge ranged from 57.0 ± 8.6 h to 76.3 ± 10.0 h depending upon the day of induced luteolysis. The release of LH was followed by ovulations. The day of PGF2α administration did not affect the interval from LH peak to ovulation. In experiment 2, heifers (n = 30) were synchronized on days 8, 11 or 14 of the oestrous cycle. Animals received an injection of GnRH 65 h after induction of luteolysis. Uniform intervals from PGF2α application to LH surge were observed in animals given PGF2α on day 11 and 14. Variation for this parameter decreased also in the group of animals where luteolysis was induced on day 8. There were no significant differences due to treatment in the mean interval from LH-peak to ovulation. In experiment 3, fixed time insemination was tested on the basis of data from Experiments 1 and 2. Synchronized heifers and high yielding cows received GnRH 65 hours after PGF2α administererd between d 8 and 14 of the oestrous cycle. Artificial insemination was carried out 13 h after GnRH application. Pregnancy rates show, that fixed time artificial insemination, independent of the recorded onset of estrus can result in high pregnancy rates. Pregnancy rates in animals at different locations were higher after induction of ovulation and timed artificial insemination (79.0, 76.0 and 47.1, 53.3 %) than in control groups with insemination after detected estrus (69.8, 63.2 and 38.6, 45.0 %).

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Factors associated with fertility of nulliparous dairy heifers following a 10-day fixed-time artificial insemination program with sex-sorted and conventional semen

Australian Veterinary Journal ◽

10.1111/avj.12430 ◽

2016 ◽

Vol 94 (5) ◽

pp. 145-148 ◽

Cited By ~ 6

Author(s):

EJ Noonan ◽

JC Kelly ◽

DS Beggs

Keyword(s):

Artificial Insemination ◽

Fixed Time ◽

Factors Associated ◽

Dairy Heifers

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Hot topic: Comparison of sex-sorted and conventional semen within a fixed-time artificial insemination protocol designed for dairy heifers

Journal of Dairy Science ◽

10.3168/jds.2012-5850 ◽

2013 ◽

Vol 96 (2) ◽

pp. 854-856 ◽

Cited By ~ 16

Author(s):

D.A. Mallory ◽

S.L. Lock ◽

D.C. Woods ◽

S.E. Poock ◽

D.J. Patterson

Keyword(s):

Artificial Insemination ◽

Fixed Time ◽

Dairy Heifers

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Effect of recombinant bovine somatotropin on pregnancy rates of Nellore cows resynchronized with the use of new DIB and third use, and inseminated at fixed-time

JOURNAL OF ADVANCES IN AGRICULTURE ◽

10.24297/jaa.v4i1.4304 ◽

2015 ◽

Vol 4 (1) ◽

pp. 356-362

Author(s):

Josemara Silva Santos ◽

Tania Cavalcante ◽

Francisca Elda Ferreira Dias ◽

Domenica Palomaris Mariano de Souza ◽

Alencariano J.S. Falcão ◽

...

Keyword(s):

Artificial Insemination ◽

Linear Models ◽

Plasma Concentrations ◽

Fixed Time ◽

Estradiol Benzoate ◽

Pregnancy Rates ◽

Recombinant Bovine Somatotropin ◽

Equine Chorionic Gonadotropin ◽

Rectal Palpation ◽

Intravaginal Device

The objective of the experiment was to evaluate the effects of recombinant bovine somatropin (rbST), and the reuse of the progesterone (P4) releasing devices in resynchronization, on the pregnancy rates of Nellore cows submitted to fixed-time artificial insemination. A group of 123 multiparae Nellore cows, was submitted to a resynchronization protocol: on day 0 a Bovine Intravaginal Device (DIB® ) with 1,0g of P4 was implanted, associated with intramuscular administration of 2,0mg of estradiol benzoate (IM); on day 8 DIB was removed; and 1,0mg of estradiol cypionate, 0,15mg of prostaglandin F2? and 300 UI of equine chorionic gonadotropin were administered; on day 10, fixed-time artificial insemination was conducted (FTAI). The cows were randomized into G1 (n=12) – without rbST / with used Bovine Intravaginal Device, G2 (n=50) – without rbST / with new DIB, G3 (n=11) - with rbST / with used DIB and G4 (n=50) – with rbST/ with new DIB. rbST was introduced on the eighth day of the protocol. Sixty days after TAI, pregnancy diagnoses were conducted, via rectal palpation. Blood samples were taken on day 0, 8 and 10 of the protocol, in order to assess P4 plasma concentrations. Pregnancy rates were statistically evaluated through Generalized Linear Models Theory and their significance was tested with Analysis of Deviance. Pregnancy rates were 58%, 40%, 81% and 48% for G1, G2, G3 and G4, respectively, with significant statistical difference for G3. Plasma concentrations of P4 were not statistically different among groups, or collections. In view of the results obtained, we concluded that the administration of rbST in association with P4 DIB, used for the third time, improves pregnancy rates. Estrus resynchronization and re-insemination positively impacted pregnancy rates.

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Effect of One-Day Delaying CIDR Administration in 5-Day Cosynch Protocol in Dairy Heifers

Animals ◽

10.3390/ani11051402 ◽

2021 ◽

Vol 11 (5) ◽

pp. 1402

Author(s):

Sükrü Metin Pancarci ◽

Örsan Güngör ◽

Osman Harput ◽

Oguz Calisici

Keyword(s):

Artificial Insemination ◽

Follicle Development ◽

Dominant Follicle ◽

Dairy Heifers ◽

Reproductive Management

Effect of one-day delaying progesterone administration at the beginning of 5-day Cosynch protocol was investigated in Holstein heifers for the first artificial insemination (AI). Heifers received a synchronized ovulation and timed AI (TAI) with CIDR inserted on day (d) 0 (CIDR-5; n = 206) or d 1 (CIDR-4; n = 192). In both group, GnRH was administered on d 0 followed by a single PGF2α injection and CIDR removal five days later from GnRH. On d 8, TAI and GnRH administration were concurrently conducted. Heifers detected in estrus up to 24 h prior to TAI were inseminated without GnRH administration. Rates of ovulation, accessory CL formation and new dominant follicle development following initial GnRH injection did not differ between groups. P/AI did not differ between CIDR-4 (44.3%, [85/192]) and CIDR-5 (51.9%, [107/206]) groups, respectively. Pregnancy per AI (P/AI) was significantly (p < 0.01) declined as heifers’ age (12–13, 14, 15, 16 and17–21 months) proceeded in CIDR-4 group (55.6%, 52.1%, 37.9%, 35.7%, 32.4%) compared to those in CIDR-5 group (60.0%, 50.0%, 53.9%, 51.5%, 46.2%) respectively. In conclusion, there is no benefit for delaying CIDR administration in 5-day Cosynch protocol in dairy heifers. However, higher P/AI in CIDR-5 group in older heifers can be considered for reproductive management.

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