PSVIII-16 Effect of estrous synchronization with natural service or fixed-timed artificial insemination with conventional or gender-skewed semen in beef females

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 431-432
Author(s):  
Julie Walker ◽  
George A Perry ◽  
Jerica J Rich
Keyword(s):  
Artificial Insemination ◽  
Reproductive Efficiency ◽  
Weaning Weight ◽  
Estrous Synchronization ◽  
Sexed Semen ◽  
Group A ◽  
Timed Artificial Insemination ◽  
Calving Season ◽  
And Gender ◽  
Natural Service

Abstract Reproductive efficiency is critical for profitability, and age at weaning critically impacts weaning weight. The objective was to evaluate estrous synchronization and/or AI with conventional (CON) or gender-skewed (SEXED) semen on calving distribution. Beef females (n=1,620) were either 1) synchronized (7-CIDR:Syn) or not synchronized (Nonsyn) and mated to bulls, 2) synchronized (7-d CIDR) and mated to bulls (SynNS) or artificially inseminated (SynAI), or 3) synchronized (7-d CO-Synch plus CIDR) and AIed with CON or SEXED semen. Calving distribution and gender were determined at birth and were analyzed using the GLIMMIX procedure in SAS. Synchronization resulted in more calves born from d1 to 14 (P < 0.01; 62% vs 47%) of the calving season. There was no differences (P = 0.31) between Syn and Nonsyn in the percent of calves born after d21, but between d22 and 42, more (P = 0.04) calves were born in the Nonsyn group. A greater proportion (P < 0.02; 46% vs 38%) of calves were born in SynNS between d1 and 14 compared to SynAI. There was no difference between treatments (P > 0.12) from d1 to 42, but more calves were born for SynAI after d43. With SEXED semen, there were no differences (P > 0.14) between CON and SEXED for the proportion of calves born from d1 to 14 or d1 to 21; however, more of the desired gender were born in the SEXED group during d1 to 14 of the calving season (P < 0.01; 84% vs 68%). More total calves were born from d22 to 42 in the SEXED group compared to the CON group (P < 0.05; 49% vs 33%). In summary, synchronization increased the proportion of females that calved early in the calving season, and SEXED semen increased the proportion of the desired gender born early in the calving season.

scholarly journals Weaning weight and optimization of reproductive efficiency in Nellore females subjected to timed artificial insemination

2020 ◽  
Vol 49 ◽  
Author(s):  
Joaquim Esquerdo Ferreira ◽  
Marco Roberto Bourg de Mello ◽  
Otávia Reis e Silva ◽  
Lara Nogueira Silenciato ◽  
Samuel Rodrigues Bonamichi do Couto ◽  
...  
Keyword(s):  
Artificial Insemination ◽  
Reproductive Efficiency ◽  
Weaning Weight ◽  
Timed Artificial Insemination

scholarly journals EFFECT OF TEMPORARY CALF REMOVAL NUMBERS IN TIMED ARTIFICIAL INSEMINATION PROTOCOLS ON WEANING WEIGHT FROM NELORE CALVES

2013 ◽  
Vol 18 (2) ◽  
Author(s):  
Luisa Cunha Carneiro ◽  
Carla Crisitan Campos ◽  
Ricarda Maria Santos
Keyword(s):  
Artificial Insemination ◽  
Weaning Weight ◽  
Timed Artificial Insemination ◽  
Calf Removal

Objetivou-se avaliar os efeitos causados pelo número de remoções temporárias de bezerros (RTB) Nelore durante o protocolo de inseminação artificial em tempo fixo (IATF) sobre o peso a desmama, além do efeito do mês de nascimento e da interação entre eles. Vacas (n = 271) com mais de 30 dias pós-parto foram sincronizadas com o seguinte protocolo de IATF: Dia 0: inserção de dispositivo intravaginal de progesterona + 2,0 mg de benzoato de estradiol; Dia 7: aplicação de 12,5 mg de dinoprost-trometamina; Dia 9: remoção do dispositivo de progesterona + 1,0 mg de cipionato de estradiol  + RTB; Dia 11: IATF + retorno dos bezerros as vacas. Os bezerros cujas mães emprenharam após a primeira IATF foram submetidos a RTB apenas uma vez,  já aquelas encontradas vazias após 30 dias foram ressincronizadas e seus bezerros foram submetidos a RTB pela segunda vez. O peso à desmama foi ajustado para 210 dias. A análise de estatística foi realizada pelo programa SAS. Não houve efeito do número de remoções temporárias no peso ao desmame (P > 0,05), porém, o mês de nascimento afetou esta variável (P <0,05). Concluiu-se que, o número de RTB em protocolos de IATF durante a estação de monta não afetou o peso à desmama dos bezerros. No entanto, o mês de nascimento afetou o peso à desmama de bezerros de corte, uma vez que aqueles que nasceram no início da estação de nascimento foram mais pesados.

scholarly journals Comparison of reproductive performance in lactating dairy cows bred by natural service or timed artificial insemination

2009 ◽  
Vol 92 (11) ◽  
pp. 5456-5466 ◽  
Author(s):  
F.S. Lima ◽  
C.A. Risco ◽  
M.J. Thatcher ◽  
M.E. Benzaquen ◽  
L.F. Archbald ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Reproductive Performance ◽  
Artificial Insemination ◽  
Lactating Dairy Cows ◽  
Timed Artificial Insemination ◽  
Natural Service

scholarly journals 107 Timing of progesterone exposure effects pregnancy rates following fixed time artificial insemination in postpartum beef cows

2019 ◽  
Vol 97 (Supplement_1) ◽  
pp. 43-44
Author(s):  
Anna L Smith ◽  
Rebecca K Poole ◽  
Kyle Mayberry ◽  
McKayla A Newsome ◽  
Harrison B Dudley ◽  
...  
Keyword(s):  
Artificial Insemination ◽  
Statistical Significance ◽  
Fixed Time ◽  
Beef Cows ◽  
Reproductive Technologies ◽  
Pregnancy Rates ◽  
Estrous Synchronization ◽  
Pregnancy Status ◽  
Timed Artificial Insemination ◽  
The Impact

Abstract Advancements in reproductive technologies have improved pregnancy rates in postpartum cows; however, undesirable consequences leading to reduced fertility still occur. Thus, the objectives were to determine if presence of a corpus luteum (CL) at the start of estrous synchronization (AIM1) or if the length of proestrus (interval from progesterone removal to a GnRH-induced LH surge; AIM2) alters fixed timed artificial insemination (FTAI) pregnancy rates. Cycling postpartum cows (n = 285) at two locations were synchronized using the CO-Synch+CIDR® FTAI protocol. Ultrasonographic measurements of luteal area were recorded at CIDR insertion. To determine the impact of proestrus length, cows were randomly assigned to either undergo CIDR removal at the time of PGF2a injection (long proestrus, n = 145), or CIDR removal 24 hours post PGF2a injection (short proestrus, n = 140). Blood samples were collected at CIDR insertion and at insemination for progesterone (P4) analysis. Pregnancy status to FTAI was assessed using ultrasonographic diagnosis at 30 d post insemination. Data were analyzed using a MIXED procedure of SAS and examined for effects of length of proestrus, P4 concentration, luteal area, sire, location, and age. Statistical significance was determined at P0.05) pregnancy rates. Pregnancy rates were greater in cows with >1 ng/mL P4 compared to cows with 0.05). Cows > 4 y old had higher AI pregnancy rates compared to 2–3 y cows (70.2±7.4 vs. 51±5.8%, respectively; P > 0.05). Based on these data, incorporating a presynchronization program to ensure the presence of a functional CL at the start of a FTAI protocol may improve pregnancy success in postpartum beef cows.

scholarly journals Factors That Optimize Reproductive Efficiency in Dairy Herds with an Emphasis on Timed Artificial Insemination Programs

Animals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 301
Author(s):  
Carlos Eduardo Cardoso Consentini ◽  
Milo Charles Wiltbank ◽  
Roberto Sartori
Keyword(s):  
Artificial Insemination ◽  
Body Condition Score ◽  
Management Program ◽  
Pregnancy Rates ◽  
Reproductive Efficiency ◽  
Service Rate ◽  
Dairy Herds ◽  
High Fertility ◽  
Reproductive Management ◽  
Timed Artificial Insemination

Reproductive efficiency is closely tied to the profitability of dairy herds, and therefore successful dairy operations seek to achieve high 21-day pregnancy rates in order to reduce the calving interval and days in milk of the herd. There are various factors that impact reproductive performance, including the specific reproductive management program, body condition score loss and nutritional management, genetics of the cows, and the cow comfort provided by the facilities and management programs. To achieve high 21-day pregnancy rates, the service rate and pregnancy per artificial insemination (P/AI) should be increased. Currently, there are adjustments in timed artificial insemination (TAI) protocols and use of presynchronization programs that can increase P/AI, even to the point that fertility is higher with some TAI programs as compared with AI after standing estrus. Implementation of a systematic reproductive management program that utilizes efficient TAI programs with optimized management strategies can produce high reproductive indexes combined with healthy cows having high milk production termed “the high fertility cycle”. The scientific results that underlie these concepts are presented in this manuscript along with how these ideas can be practically implemented to improve reproductive efficiency on commercial dairy operations.

An economic evaluation of estrous synchronization and timed artificial insemination in suckled beef cows1

2012 ◽  
Vol 90 (11) ◽  
pp. 4055-4062 ◽  
Author(s):  
J. C. Rodgers ◽  
S. L. Bird ◽  
J. E. Larson ◽  
N. Dilorenzo ◽  
C. R. Dahlen ◽  
...  
Keyword(s):  
Economic Evaluation ◽  
Artificial Insemination ◽  
Estrous Synchronization ◽  
Timed Artificial Insemination

scholarly journals 128 Pregnancy and calving rates of beef cows comparing the sex-selected semen to conventional semen using timed artificial insemination

2020 ◽  
Vol 98 (Supplement_2) ◽  
pp. 1-1
Author(s):  
Jennifer McMurray ◽  
Andrea N DeCarlo ◽  
Nathan Long ◽  
Scott Pratt
Keyword(s):  
Artificial Insemination ◽  
Post Partum ◽  
Statistical Significance ◽  
Fixed Time ◽  
Beef Cows ◽  
Pregnancy Rates ◽  
Chi Square ◽  
Estrous Synchronization ◽  
Beef Cow ◽  
Sexed Semen

Abstract A study was conducted over three years to determine if differences in pregnancy rates existed between the use of commercially available sex-selected (SEXED) or conventional semen (STD) coupled to fixed-time artificial insemination (TAI). A total of 240 (2016: n = 80; 2017: n = 95; 2018: n = 65) primi- or multiparous Angus or Angus-cross cows being at 45 days post-partum or greater were blocked by weight and BCS and assigned to be inseminated using SEXED semen or STD semen. Artificial insemination was performed by the same AI technicians (n = 3) across all years. All cows were subjected to estrous synchronization and insemination using the SEXED semen or STD semen with TAI between 63 and 66 h post-CIDR removal. Fourteen days post-TAI all cows were exposed to bulls for natural service. Cows were subjected to transrectal ultrasonography at day 30 and day 45 post-TAI to determine pregnancy rates and calving dates in the subsequent calving seasons were recorded to determine calving rates to TAI. Pregnancy rates were compared using a Chi-square test of two proportions. All statistical calculations were performed using JMP software and statistical significance was based on p-values less than 0.05. Pregnancy rates at day 30 and day 45 were 39.67% and 48.76% for SEXED and 47.90% and 54.62% for STD, respectively (P &gt; 0.05). The percentage of calves born to TAI pregnancies for sex-selected semen and conventional semen were 22.31% and 40.34%, respectively (P &lt; 0.05). These data indicate that the use of sex-selected semen can give similar pregnancy results to conventional semen in beef cow operations using TAI at day 30 of gestation; however, there was a reduction in the number of offspring to TAI comparing calving dates to animals pregnant at day 30.

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