80 Relationship between anogenital distance and reproductive efficiency of embryo recipient dairy heifers

2022 ◽  
Vol 34 (2) ◽  
pp. 276
Author(s):  
A. Garcia-Guerra ◽  
R. Sala ◽  
L. Carrenho-Sala ◽  
F. Valencia ◽  
M. Fosado ◽  
...  
Keyword(s):  
Reproductive Efficiency ◽  
Anogenital Distance ◽  
Dairy Heifers

scholarly journals Efforts to improve reproductive efficiency in dairy heifers experiencing delayed puberty using heatsynch protocol

2020 ◽  
Vol 492 ◽  
pp. 012076
Author(s):  
A Fausiah ◽  
A L Toleng ◽  
M Yusuf ◽  
Sahiruddin ◽  
D Ramadhanty ◽  
...  
Keyword(s):  
Delayed Puberty ◽  
Reproductive Efficiency ◽  
Dairy Heifers

scholarly journals Effects of delaying the removal of the intravaginal progesterone device by 24 h in the 5d Co-synch protocol in heifers

2021 ◽  
Author(s):  
Aitor Fernandez-Novo ◽  
Sergio Santos-Lopez ◽  
Jose Luis Pesantez-Pacheco ◽  
Natividad Pérez Villalobos ◽  
Ana Heras-Molina ◽  
...  
Keyword(s):  
Body Condition Score ◽  
Fixed Time ◽  
Conception Rate ◽  
Reproductive Efficiency ◽  
Beef Heifers ◽  
Serum Progesterone ◽  
Dairy Heifers ◽  
Condition Score ◽  
Commercial Farms ◽  
Beef Herds

Abstract Background In beef herds, increasing animal welfare, improving reproductive performance and easing animal management are key goals in farm economics. This study explored whether delaying the removal of the intravaginal progesterone device by 24 h in heifers synchronized with a 5d Co-synch 72 h protocol could improve reproductive efficiency of fixed-time artificial insemination (FTAI). In Experiment 1, we examined whether such a modified protocol would provide an acceptable, total synchronization rate (TSR) in cycling Holstein heifers. Heifers (13.4 ± 0.69 mo.) were randomly assigned to the standard 5d Co-synch 56 h protocol (5dCo56; n = 10), the standard 5d Co-synch 72 h protocol (5dCo72; n = 17), or the modified 5d Co-synch 72 h protocol, in which removal of the progesterone device was delayed by 24 h (6dCo48; n = 19). Heifers were considered synchronized (TSR) if serum progesterone value > 1.0 ng/mL and the corpus luteus (CL) was detectable by ultrasonography on Day 5, if progesterone < 1.0 ng/mL and at least one follicle had a diameter > 8 mm on Day 7.5, and if progesterone > 1.0 ng/mL and CL was detectable on Day 15. In Experiment 2, 309 cycling beef heifers on 18 commercial farms were subjected to the 5d Co-synch 72 h or 6d Co-synch 48 h protocol and conception rate (CR) studied. Results In experiment 1, the three protocols in dairy heifers led no differences on TSRs of 80.0% (5dCo56), 88.2% (5dCo72) and 89.5% (6dCo48). In experiment 2, the CR from the beef heifers, observed during two consecutive reproductive seasons did not differ: 59.7% for 5dCo72 and 62.0% for 6dCo48 (P = 0.907). Heifer age, body condition score or stress score did not significantly affect conception rate. Conclusions These results suggest that delaying removal of the intravaginal progesterone device by 24 h during the standard 5d Co-synch 72 h protocol provides satisfactory results without reducing reproductive efficiency of heifers.

The use of fixed time artificial insemination programmes for the use of sexed semen in block calving dairy heifers

Livestock ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 124-130
Author(s):  
Mike Kerby ◽  
Tom Clarke ◽  
Tom Angel ◽  
Kythé Mackenzie
Keyword(s):  
Artificial Insemination ◽  
Prostaglandin F2α ◽  
Cost Benefit ◽  
Fixed Time ◽  
Reproductive Efficiency ◽  
Costs And Benefits ◽  
Dairy Heifers ◽  
Conception Rates ◽  
Sexed Semen

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.

Fluctuation of Reproductive Efficiency Traits of Holstein Cows in the Tokachi Area, Hokkaido

1982 ◽  
Vol 53 (12) ◽  
pp. 792-796
Author(s):  
Yoshinori TERAWAKI ◽  
Koji MUTO ◽  
Hitoshi ONO
Keyword(s):  
Holstein Cows ◽  
Reproductive Efficiency
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