Estrous response and pregnancy percentages following use of a progesterone-based, split-time estrous synchronization treatment regimens in beef heifers

Kasimanickam, Ramanathan; Jorgensen-Muga, Katriana; Beumeler, Janey; Ratzburg, Kamron; Kapi, Aliasgar; Kasimanickam, Vanmathy; Kastelic, John P.

doi:10.1016/j.anireprosci.2020.106544

Cited by 2 publications

(4 citation statements)

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“…Estrous synchronization and fixed-time artificial insemination (TAI) have been successfully implemented to improve the productivity and profitability of farmers (Dahlen et al, 2014). Estrous synchronizations using hormonal intervention such as PGF2α and GnRH were reported to increase fertilization and pregnancy rates (Bishop et al, 2017;Kasimanickam et al, 2020). The PGF2α is used to regress corpus luteum, which subsequently induces ovulation and ripening of the follicles (Kasimanickam et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Estrous synchronizations using hormonal intervention such as PGF2α and GnRH were reported to increase fertilization and pregnancy rates (Bishop et al, 2017;Kasimanickam et al, 2020). The PGF2α is used to regress corpus luteum, which subsequently induces ovulation and ripening of the follicles (Kasimanickam et al, 2020). Since the success of estrous synchronization should be supported by a sufficient nutrition, evaluation of the level of protein supplementation at specific age of synchronized Ongole Grade cows is needed to evaluate the effect of concentrate CP levels as feed supplement on different ages of Ongole Grade cows on estrous signs and progesterone concentrations.…”

Section: Introductionmentioning

confidence: 99%

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Estrous Signs and Progesterone Profile of Ongole Grade Cows Synchronized at Different Ages Fed Different Level of Dietary Crude Protein

Hayati¹,

Panjono

Irawan

2021

Trop. Anim. Sci. J.

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This study aimed to evaluate the effects of concentrate supplementation containing different protein levels on estrous signs and progesterone profiles of two age groups of Ongole Grade cow. Thirty females cows were grouped according to their ages (G1= 25±1.6 months; G2= 37±1.7 months), where each group received 3 dietary treatments with 5 replicates. The dietary treatment was based on CP levels of total mixed ration (TMR) (T1= 7.41% CP; T2= 8.23% CP; and T3= 9.17% CP). The cows were synchronized using PGF2α and GnRH, followed by time-fixed artificial insemination (TAI) using frozen semen. Data on nutrient intake and progesterone concentration were subjected to a randomized complete block design of ANOVA following a factorial arrangement of 2×3 while data of estrous signs were analyzed using non-parametric methods of Kruskal-Wallis and independent t-test. The results showed that there was a significant interaction effect between age group and dietary TMR treatment on CP intake and TDN intake in which the highest intakes were found in older cows (G2) fed TMR at 7.41% CP (T1) (p<0.01). Dry matter intake (DMI) was not affected either by age group or level of concentrate supplementation. Results also suggested that estrous signs, including vulva redness, swollen vulva, and mucus discharge, were higher in older cows (G2) than in younger cows (G1). In addition, interactions were also found on progesterone levels, whereas younger cows (G1) fed TMR with 9.17% CP (T3) showed the highest concentration of progesterone on d 5, 17, and 21 (p<0.01). In conclusion, this study suggests that younger cows receiving the highest CP diet (T3) result in higher progesterone concentration during the experimental period. Therefore, it is important to fed sufficient dietary CP especially for cattle in early reproduction period to optimize the reproductive performance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Estrous Signs and Progesterone Profile of Ongole Grade Cows Synchronized at Different Ages Fed Different Level of Dietary Crude Protein

Hayati¹,

Panjono

Irawan

2021

Trop. Anim. Sci. J.

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“…during 2020 breeding season and 32.0% and 30.4% lesser than those displayed signs of oestrus and inseminated with CS and SS, respectively. Other studies showed that PR/AI for cows that did not express oestrus until 72 hr after PGF2α and inseminated with CS varies from 39.1% to 48.7% (Kasimanickam et al, 2016(Kasimanickam et al, , 2020.…”

Section: Discussionmentioning

confidence: 99%

“…In the present study, the PR/AI for cows that did not express oestrus and inseminated with CS were 41.7% and 37.3% during 2019 breeding season, 17.5% and 17.4% during 2020 breeding season and 32.0% and 30.4% lesser than those displayed signs of oestrus and inseminated with CS and SS, respectively. Other studies showed that PR/AI for cows that did not express oestrus until 72 hr after PGF2α and inseminated with CS varies from 39.1% to 48.7% (Kasimanickam et al., 2016, 2020).…”

Section: Discussionmentioning

confidence: 99%

Pregnancy and offspring sex ratio following insemination with SexedULTRA and conventional semen in cows in a commercial beef operation

Kasimanickam

Ratzburg

2021

Reprod Domestic Animals

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Y-sorted semen (SS) is designed for the deliberate production of genetically superior bull calves, thereby accelerating production parameters in a cattle operation. A limitation is that insemination with SS results in pregnancies ranging from 75% to 90%, that is a 5% to 10% point decrease from conventional semen (CS) in pregnancy rate per AI (PR/AI) (Maicas et al., 2019;Seidel Jr, 2014). Initially, SS was recommended for inseminating heifers after detected oestrus

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Estrous response and pregnancy percentages following use of a progesterone-based, split-time estrous synchronization treatment regimens in beef heifers

Cited by 2 publications

References 39 publications

Estrous Signs and Progesterone Profile of Ongole Grade Cows Synchronized at Different Ages Fed Different Level of Dietary Crude Protein

Estrous Signs and Progesterone Profile of Ongole Grade Cows Synchronized at Different Ages Fed Different Level of Dietary Crude Protein

Pregnancy and offspring sex ratio following insemination with SexedULTRA and conventional semen in cows in a commercial beef operation

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