Control of the estrous cycle to improve fertility for fixed-time artificial insemination in beef cattle: A review1

2010 ◽  
Vol 88 (suppl_13) ◽  
pp. E181-E192 ◽  
Author(s):  
G. C. Lamb ◽  
C. R. Dahlen ◽  
J. E. Larson ◽  
G. Marquezini ◽  
J. S. Stevenson
Keyword(s):  
Beef Cattle ◽  
Estrous Cycle ◽  
Artificial Insemination ◽  
Fixed Time

scholarly journals STRATEGIES TO INCREASE FERTILITY DURING FIXED-TIME ARTIFICIAL INSEMINATION IN BEEF CATTLE

SPERMOVA ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 73-82
Author(s):  
Ana Clara Canto Souza ◽  
◽  
Gabrieli Dutra Gonçalves ◽  
Andrey Osvaldo Souza Ferro ◽  
Deborah Nakayama Yokomizo ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Estrous Cycle ◽  
Breeding Season ◽  
Critical Points ◽  
Artificial Insemination ◽  
Fixed Time ◽  
Pregnancy Rates ◽  
Follicular Wave ◽  
New Strategies ◽  
In Pregnancy

The application of Fixed Time Artificial Insemination (FTAI) protocols has strongly boosted artificial insemination in Brazilian bovine herds. The control of the estrous cycle with protocols based on progesterone and estrogen involves synchronizing the emergence of a follicular wave, controlling the progesterone phase, and inducing ovulation in a synchronized manner. The increase in pregnancy rates starts with the preparation of the breeding season and the choice of protocols and females. Thereafter, based on the characteristics of the property and the lots of animals, small adjustments can be made to the hormonal protocols as needed. Finally, resynchronization can increase usability by allowing multiple inseminations within short periods. The search for new strategies is of paramount importance for the development of the FTAI protocol and the increase in final pregnancy rates. Thus, this review sought to highlight the main critical points and adjustments of the FTAI protocols and their applicability in the reproduction of beef cattle.

Parenteral Copper Administration at the Beginning of a Fixed-Time Artificial Insemination Protocol in Beef Cattle: Effect on Ovarian Function and Pregnancy Rates

2021 ◽  
Author(s):  
Juan Patricio Anchordoquy ◽  
Santiago Nicolás Lorenti ◽  
Gustavo Sebastián Polero ◽  
Nicolás Agustín Farnetano ◽  
Diana Esther Rosa ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Artificial Insemination ◽  
Ovarian Function ◽  
Fixed Time ◽  
Pregnancy Rates

Response of beef heifers and non-suckling beef cows to different oestrous synchronization protocols

2002 ◽  
Vol 74 (3) ◽  
pp. 547-552 ◽  
Author(s):  
D. Cavestany ◽  
N. Negrin ◽  
R. Negrin ◽  
J. F. Groth
Keyword(s):  
Beef Cattle ◽  
Medroxyprogesterone Acetate ◽  
Artificial Insemination ◽  
Experimental Period ◽  
Fixed Time ◽  
Beef Cows ◽  
Pregnancy Rates ◽  
Gnrh Analogue ◽  
Beef Heifers

AbstractThe objective was to evaluate different oestrous synchronization schemes in beef cattle under range conditions. In experiment 1, 202 heifers averaging 26 months of age were assigned randomly to three treatments: (a) GnRH-PG. (no. = 44) day 0 (D0): injection of GnRH; D7: injection of PGF2α; D0 to D25 oestrous detection (OD) and artificial insemination (AI); (b) OD-PG. (no. = 45) D0 to D4; OD + AI; D5: injection of PGF2α; D5 to D25 OD + AI; and (c)Ovsynch. (no. = 113) D0: injection of GnRH; D7: injection of PGF2α; D9: injection of GnRH and 16 h later AI at fixed time. In experiment 2, 318 non-suckling cows were assigned randomly to three treatments: (a) GnRH-PG. (no. = 106) D0: injection of GnRH; D7: injection of PGF2α; D0 to D25 OD + AI; (b) GnRH-MAP-PG. (no. = 106) D0: injection of a GnRH analogue and insertion of an intravaginal sponge impregnated with 250 mg of medroxyprogesterone acetate; D7: injection of PGF2α and sponge withdrawal; D0 to D25 OD + AI; (c) controls. (no. = 106) OD and AI. The experimental period lasted 25 days and, with exception of the Ovsynch treatment, oestrous detection was carried out twice a day (a.m./p.m.) and inseminations performed 12 h later. The pregnancy rates assessed by ultrasonography 30 days after AI were: experiment 1: (a) 30·0%; (b) 28·6% and (c) 62·3% (P < 0·05); experiment 2: (a) 60·2%; (b) 57·8% and (c) 45·5% (P < 0·05). It is concluded that in heifers and non-suckling cows, oestrous synchronization treatments result in higher pregnancy rates. In non-suckling cows, the addition of a progestagen did not improve the response.

Cooled semen for fixed-time artificial insemination in beef cattle

2016 ◽  
Vol 28 (7) ◽  
pp. 1004 ◽  
Author(s):  
Juliana C. Borges-Silva ◽  
Márcio R. Silva ◽  
Daniel B. Marinho ◽  
Eriklis Nogueira ◽  
Deiler C. Sampaio ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Sperm Motility ◽  
Artificial Insemination ◽  
Egg Yolk ◽  
Fixed Time ◽  
Pregnancy Rates ◽  
Reproductive Efficiency ◽  
Sperm Abnormalities ◽  
Hypoosmotic Swelling Test ◽  
Interesting Approach

This study evaluated the use of cooled semen in a fixed-time artificial insemination (FTAI) program compared with frozen–thawed semen to improve pregnancy rates in beef cattle. Ejaculates of three bulls were collected and divided into two treatments: (1) frozen–thawed semen and (2) cooled semen. Egg-yolk extender without glycerol was used for the cooled semen treatment. Straws (25 × 106 spermatozoa) were submitted to cooling for preservation at 5°C for 24 h, after which FTAI was performed. Nelore cows (n = 838) submitted to FTAI were randomly inseminated using frozen–thawed semen or cooled semen. There was a 20% increase in the pregnancy per AI (P AI–1) using cooled semen compared with frozen–thawed semen (59.9 ± 4.7 vs 49.4 ± 5.0%; P < 0.005). There was no difference in P AI–1 among the bulls (P = 0.40). The frozen–thawed semen had fewer functional spermatozoa than did the cooled semen when evaluated by sperm motility (61.7 vs 81.0%), slow thermoresistance test (41.7 vs 66.7%) and hypoosmotic swelling test (38.3 vs 53.7%; P < 0.05). The percentage of sperm abnormalities did not differ between the freeze–thawing and cooling processes (18.6 vs 22.1%; P > 0.05). Because there was less damage to spermatozoa and improvement in P AI–1, the use of cooled semen instead of frozen–thawed semen is an interesting approach to increase reproductive efficiency in cattle submitted to a FTAI protocol.

scholarly journals Human resources in artificial insemination of beef cattle: profile of managers and inseminators

2010 ◽  
Vol 39 (7) ◽  
pp. 1464-1470 ◽  
Author(s):  
Lívia dos Santos Russi ◽  
Eliane Vianna da Costa-e-Silva ◽  
Carmem Estefânia Serra Neto Zúccari ◽  
Caciliana da Silva Recalde
Keyword(s):  
Beef Cattle ◽  
General Education ◽  
Interpersonal Relationships ◽  
Artificial Insemination ◽  
Fixed Time ◽  
Selection Processes ◽  
Open Questions ◽  
Management Processes ◽  
Animal Handling

The objective of the present study was to outline the profile of managers and inseminators involved in beef cattle artificial insemination programs to characterize the management processes involved in this activity. Additionally, by interviewing managers and inseminators, it was searched to detect particularities concerned to personal life and work that can be used to evaluate the quality of life of inseminators on farms. The open questions were analyzed by frequency of answer, after being grouped by similarity. Accordingly to the results, managers associate the concept of human resource management to work supervision, mainly, prioritizing technical factors such as professional experience and indexes in the selection processes, although problems in interpersonal relationships have been shown as the main reason for dismissal. In general, education level of the inseminators is not good because most of these workers studied only to the first series of primary school. Inseminators prefer conventional artificial insemination although they recognize that fixed-time artificial insemination can make animal handling on the farm easier. The performance of these workers seems to be determined more by interpersonal relationships than by the salaries.

Fixed-time artificial insemination in beef cattle using CIDR-B devices, progesterone and estradiol benzoate

1999 ◽  
Vol 51 (1) ◽  
pp. 404 ◽  
Author(s):  
M.G Colazo ◽  
M Sefchek ◽  
H Illuminati ◽  
G Meglia ◽  
E Schmidt ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Artificial Insemination ◽  
Fixed Time ◽  
Estradiol Benzoate

Effect of progesterone concentration and duration of proestrus on fertility in beef cattle after fixed-time artificial insemination

2013 ◽  
Vol 79 (5) ◽  
pp. 859-866 ◽  
Author(s):  
D. Dadarwal ◽  
R.J. Mapletoft ◽  
G.P. Adams ◽  
L.F.M. Pfeifer ◽  
C. Creelman ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Artificial Insemination ◽  
Fixed Time ◽  
Progesterone Concentration

scholarly journals Conception risk of beef cattle after fixed-time artificial insemination using either SexedUltra™ 4M sex-sorted semen or conventional semen

2018 ◽  
Vol 118 ◽  
pp. 126-129 ◽  
Author(s):  
B.R. Crites ◽  
R. Vishwanath ◽  
A.M. Arnett ◽  
P.J. Bridges ◽  
W.R. Burris ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Artificial Insemination ◽  
Fixed Time

scholarly journals Factors which interfere in the results of the Fixed-Time Artificial Insemination in beef cattle

2021 ◽  
Vol 4 (4) ◽  
pp. 5-14
Author(s):  
Alex Adriano Cavalcante Ferreira ◽  
◽  
Avelino Velloso Ferreira Murta ◽  
Artur Azevedo Menezes ◽  
Tiago Oliveira Brandão ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Corpus Luteum ◽  
Body Condition ◽  
Artificial Insemination ◽  
Body Condition Score ◽  
Fixed Time ◽  
The Body ◽  
Fertility Rates ◽  
Condition Score ◽  
Animal Category

The objective of this study was to evaluate the effect of the animal category, the cyclicity, the CIDR reuse, the body condition score (BCS), the inseminator and the bull on the fertility rates of bovine submitted to a FTAI protocol. It was observed that pluriparous demonstrated a higher fertility. The group With Corpus Luteum obtained a higher conception rate. The CIDR of 4th use reduced (P <0.05) the chance of conception. The chances of conception in cows of the Low BCS group were lower (P <0.05), than the cows with intermediate and high BCS. The inseminator and the bull exerted influence on the fertility. Therefore, all factors are important in FTAI programs.

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